text:
Planet Earth/4d. Greenhouse Gases

How gasses interact with electromagnetic radiation
All gases, including those in the atmosphere, reflect, scatter and absorb photons. Gasses are composed of molecules more widely spaced than molecules found in liquids and solids. When photons from sunlight pass through the atmosphere, these widely spaced gas molecules absorb some of the light, causing the atmosphere to block these sun’s rays, while some molecules let the higher energy light waves pass through the atmosphere, but block lower energy light waves that are typically reflected back into space. The molecules which absorb photons in the invisible lower energy infrared spectrum of light are collectively called Green House gasses, and include four key molecules found in Earth’s atmosphere: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), and Nitrous oxide (N2O). There are other gas molecules which can absorb infrared light, including Ozone, Chlorofluorocarbons, and Hydrofluorocarbons, but these molecules do not absorb as much infrared light as the big four. The Earth’s atmosphere is composed almost entirely of nitrogen (N2), oxygen (O2), and argon (Ar) which can block high energy light in the Ultraviolet or (UV) light spectrum, such as oxygen, but none of these gas molecules absorb infrared light. As such, none of them are considered Green House gasses.

Your eyes are perfectly adapted to seeing light in the visible spectrum within a narrow band of wavelengths (380 to 700 nanometers). The visible spectrum of light is the range of light waves from the sun that are able to pass through the atmosphere to reach the surface of the Earth. You cannot see Ultraviolet wavelengths (smaller than 380 nanometers) because so few UV light waves make it through the oxygen rich atmosphere. Likewise, water vapor (H2O) blocks much of the InfraRed wavelengths (greater than 1,000 nanometers) coming from the sun. Your eyes are adapted to a narrow slit of visible light wavelengths within the range permitted to pass through the Earth’s atmosphere. All the colors of the world; violet, indigo, blue, green, yellow, orange, and red, are of course not all the colors that exist, but are the range of wavelengths of light allowed to pass through the gasses that are found in Earth’s atmosphere. Water vapor (H2O) as a Green House gas is one of the most important. As a large molecule, water vapor in the air arises from evaporation and is measured by relative humidity.

Water Vapor as a Greenhouse Gas
Water vapor (H2O) can absorb an enormous range of infrared wavelengths, with absorption bands around 1,000 nanometers, 6,000 nanometers and any infrared light longer than 12,500 nanometers. In fact, microwave ovens work because water (H2O) has such a broad band of absorption of light wavelengths that extend out to long microwave lengths, of several centimeters.

The amount of water vapor absorbed within the atmosphere is directly related to the temperature of the atmosphere. When the atmosphere is hot, the holding capacity of water vapor in the atmosphere increases, when the atmosphere is cold, the holding capacity of water vapor decreases. The amount of water vapor in air is directly related to temperature, but also pressure. Air with low pressures have less capacity to hold water vapor than higher pressures. This relationship will be explored further later in discussions of atmospheric pressure and weather patterns. The relationship between temperature and the holding capacity of water can be observed on cold winter days. Imagine a cabin in the woods, which is heated by a gas stove inside the cabin. Outside air is cold, and hence holds less water vapor. However, when this outside air comes inside the cabin and is heated, the air suddenly increases its capacity to hold more water vapor. This undersaturated air will result in an increase in evaporation within the cabin. Water will be sucked into the warmed air, leaving any occupant inside the cabin with dry cracked skin. This also is the reason that some of the Earth’s coldest regions, are also some of Earth’s driest places. The cold air cannot hold as much water vapor as warm air.

This relationship is directly a result of water vapor being a Green House gas that absorbs infrared light waves. Inside the heated cabin, the amount of infrared light is much greater than outside the cabin. Because water absorbs this energy, the water vapor molecules will increase their energy states and undergo a phase transition from liquid water to a gas.

The term “Green House” is slightly a misnomer, as greenhouses trap heat inside by allowing sunlight to pass through transparent windows which prevent the exchange of air with the outside. Warm air inside the greenhouse can hold more water, and water tanks or sprinklers will make the inside of the greenhouse more humid for plants to grow. If a greenhouse does not contain any water source, it becomes very dry inside during the winter, and would likely dry out any plants left in such an environment. Greenhouses work best with the availability of the Green House gas of water vapor, which is able to absorb the infrared light, making greenhouses particularly humid and warm, and ideal for growing plants.

Methane as a Greenhouse Gas
Methane (CH4) is another Green House gas, which absorbs infrared light, with a specific range around 3,000 nanometers and between 7,000 to 8,000 nanometers in the infrared spectrum of light. Methane is a particular strong Green House gas, because of the band of absorption between 7,000 to 8,000 which is not absorbed by water vapor. An atmosphere rich in both water vapor and methane can absorb a wider range of infrared wavelengths of light, allowing less light to escape to space, and retaining more of that energy near the surface of the Earth. Methane is typically a rare gas in the atmosphere, but recent measurements of methane have shown a dramatic increase from 1000 ppb in the 1950s to 1900 ppb in 2020. Ice cores indicate that methane was never above 800 ppb until the modern age. Indicating that since the advent of humans (Homo sapiens) on Earth, methane in the atmosphere has more than doubled. Since 2007, methane has increased dramatically, particularly in the northern hemisphere, as observed from the atmospheric infrared sounder (AIRS) aboard NASA’s Aqua satellite.

Methane under the Arctic region forms vast deposits of methane hydrate, a solid state of methane that forms under pressure and cold temperatures. In the deep cold ocean waters of the Arctic Ocean, methane accumulates due to the decay and breakdown of ocean organisms, and methanogens which feed on this organic carbon and release methane. The intense cold ocean water (near freezing temperatures), and intense pressure of the deep water, results in a solid form of methane to accumulate on the ocean floor, called methane hydrate (also called methane clathrate). If ocean waters warm, this methane outgases with a phase transition from a solid to a gas, and this gas bubbles up from the ocean floor and into the atmosphere.

Methane in the presence of oxygen results in the reaction CH4 + 2O2 → 2H2O + CO2 an oxidization of methane that occurs in the atmosphere. Note, that this reaction results in the production of both water vapor and carbon dioxide, two other greenhouse gasses. The resistance time of methane in the atmosphere is short about 8 to 9.5 years. This indicates that today’s high values of methane in the atmosphere are less a culminative effect, but represent net yearly increases of methane into the atmosphere. The atmospheric infrared sounder (AIRS) aboard NASA’s Aqua satellite gives a grim picture of the North Hemisphere of Earth, with a recent enrichment of the atmosphere of methane. The source of the methane has alarmed atmospheric scientists.

In addition to methane outgassing from the High Arctic, methane outgasses from oil and gas fields which frequently leak methane from wells and when transported in gas pipes. Technology advancements of fracking rock to release underground naturally occurring methane deposits, which are used as a natural gas fuel source and coal-bed methane; the process of using chemicals (acids) on underground coal to release methane fuel have likely led to some of the recent increases in methane in the atmosphere. Livestock, such as dairy farms also contributes to methane in the atmosphere. Using infrared sensors (both from aircraft and on the ground) scientists have found some of these sources, and governments have passed laws to curb the industrial release of methane into the air that we breathe. Methane in the atmosphere remains a major concern for atmospheric scientists.

Carbon dioxide as a Greenhouse Gas
Carbon dioxide has become synonymous with greenhouse gas. As a large molecule carbon dioxide absorbs infrared light around 4,250 nanometers and a broad band between 13,900 to 16,100 nanometers. This longer wavelength band overlaps water vapor, but in cold dry air, high carbon dioxide can have a dramatic effect on the absorption of infrared light. The lower band around 4,250 nanometers is within an infrared band that most other greenhouse gasses do not absorb, making carbon dioxide, in the addition to methane and water vapor a very effective greenhouse gas. Since 1958 Carbon dioxide has risen from 310 ppm to 410 ppm in 2020, and with a very long resistance time in the atmosphere (several hundred thousand years), carbon dioxide released into the atmosphere has been accumulating at an alarmingly fast rate. Naturally carbon dioxide can be drawn down from the atmosphere by reacting with H2O to form carbonic acid, which becomes bonded to calcium bearing rocks, as calcium carbonate, but this process is very slow, at rates that mountains slowly erode. A faster method of removal of carbon dioxide from the atmosphere results from photosynthesizing life forms, which need to be buried underground after death, otherwise the carbon dioxide can be re-released into the atmosphere if these lifeforms decay or are combusted in fires, such as forest fires, which can release massive amounts of carbon dioxide back into the atmosphere.

Nitrous oxide as a Greenhouse Gas
Nitrous oxide (N2O) is an important greenhouse gas that does not get as much attention as methane and carbon dioxide. Nitrous oxide gas spans a number of absorption bands in the infrared spectrum, and hence is a greenhouse gas. Nitrous oxide levels have been also increasing in the atmosphere from 288 ppb to about 330 ppb in 2020. Much of this nitrous oxide comes from a complex process of the oxidation of ammonia (NH3) used as fertilizers on crops, as well as from combustion engines, as nitrous oxide allows the engines to burn more fuel by providing more oxygen than air alone, resulting in a more powerful combustion. Urban centers, particularly where automobile traffic is high, often have higher concentrations of nitrous oxide. The process of oxidation of ammonia (NH3) is complex, and involves NH3-oxidising bacteria, which take ammonia (NH3) and oxidise the nitrogen to nitrite (NO−2), followed by the reduction to nitric oxide (NO), which forms N2O, and finally nitrogen (N2). Plants require nitrogen to grow, but are unable to use atmospheric molecular nitrogen (N2). Nitrogen fixation by bacteria in the soils, help produce ammonia (NH3) that plants require. The industrialization of agriculture has pushed for the widespread application of human produced ammonia (NH3) on crops to increase plant growth. This has led to increases in nitrogen oxide compounds, often called NOx (often referred to as nox, or nitrogen oxides). Unlike carbon dioxide, the nitrogen oxides absorb some light waves in the visible spectrum, and produced brown clouds of smog, when concentrations are high above urban centers. Nitrogen oxides are also related to the formation of near surface ozone, which is a toxic gas. This process requires visible light from the sun (wavelengths around 420 nanometers), via the Leighton relationship. Ozone levels at the surface of Earth are closely monitored because when they are elevated they cause damage to the tissues of the lungs.

All these greenhouse gasses absorb some amount of the infrared spectrum of light, resulting in capturing energy that in their absence would have been reflected back into space. Greenhouse gasses act like a wool blanket, preventing Earth’s heat from escaping into space. The more Greenhouse gasses are in the atmosphere, the greater the thermal insulation of the planet. Higher global temperatures result in great amounts of water vapor in the atmosphere, a powerful greenhouse gas; a positive feedback that results in even higher global atmospheric temperatures. Methane is released from the deep cold oceans when temperatures in the deep ocean increase, resulting in another powerful feedback that further results in even higher global atmospheric temperatures. A vicious cycle can quickly develop that would lead to runaway global temperatures, and such runaway greenhouse outgassing events have happened in Earth’s past 55.5 million years ago, at the Eocene-Paleocene Boundary (the PETM event), and 252 million years ago, at the Permian-Triassic Boundary (during the Great Dying event). Such events significantly altered the Earth, making it less habitable for animal life.

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Planet Earth/4d. Greenhouse Gases


title: User:Abhinav.agarwal3


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1939 12

Link to Issue PDF
| WorldRadioHistory.com's scan of | Australasian Radio World - Vol. 4 No. 7 - December 1939 has been utilised to create the partial content for this page and can be downloaded at this link to further extend the content and enable further text correction of this issue: | ARW 1939 12

In general, only content which is required for other articles in this Wikibook has been entered here and text corrected. The material has been extensively used, inter alia, for compilation of biographical articles,  radio club articles and  station articles.

Front Cover
The Australasian Radio World

DECEMBER 1, 1939; Vol. 4 - No. 7; Price, 1/-

Registered at the G.P.O., Sydney, for transmission by post as a periodical

Cover Photo: The 165' steel tower on top of the new A.W.A. building in York St., Sydney (see page 8).

Highlighted Contents: More About the "Vulcan Shortwaver": Multi-Meters and Oscillators: Beam-A-Scope: Loop Portable Three: "Air-Scout Comm. Six": Latest World S.-Wave News: B.C. D.X. Contest

P.02 - Editorial Notes
"Radio World" Change of Address

Readers are asked to note that, early in December, "Radio World" headquarters will be shifted to a building now being erected for the Bridge Printery Pty. Ltd., at 117 Reservoir Street (off Elizabeth St., near Central Railway Station). As from December 11, all correspondence should be addressed as follows: "Australasian Radio World," 117 Reservoir Street, Sydney, N.S.W. The new "Radio World" telephone number - FL2842 - appears in the current directory.

P.02 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Managing Editor - A. Earl Read, B.Sc.

Vol. 4. - DECEMBER, 1939 - No. 7.

P.02 - Contents
CONTENTS:

Loop Portable Three. . . . 3

The Story of R.C.S. Radio (1). . . . 6

R.C.S. Releases Five-Band Coil Assembly. . . . 8

Mullard World-Master Consolette Gives Outstanding Performance. . . . 10

Junior Class "B" Amplifier. . . . 13

Air-Scout Communications Six. . . . 15

Service Equipment (2). . . . 18

Beam-A-Scope Noise-Killer Aerial. . . . 23

The Vulcan Shortwaver. . . . 26

What's New In Radio. . . . 27

Two New Amplion Speakers. . . . 31

Shortwave Review. . . . 32

"Radio World" All-Wave Oscillator. . . . 37

P.02 - Publication Notes
The "Australasian Radio World" is published monthly by Read Publications. Editorial offices, 214 George Street, Sydney, N.S.W. Telephone BW6577. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 14th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Note: Address of Editorial offices after December 10, 1939, will be 117 Reservoir Street, Sydney.

Printed by Bridge Printery Pty. Ltd., 214 George Street, Sydney, N.S.W., for the proprietors of the "Australasian Radio World," 214 George St., Sydney (Footnote P.40)


text:
User:Levthecooldude666/sandbox

Hi, i am Levthecooldude666. I am a user and editor of wiki medias projects. I have made it my mission to help wiki media share free knowledge. You don't a 10 year old to be writing this. Well you might be as surprised! If you have any comments or questions be sure to write it! Hoping you all are doing well. Levthecooldude666

title: User:Levthecooldude666/sandbox


text:
Web App Development with Google Apps Script/Responding to users

JavaScript for user interfacing
This book is all about leveraging your google account to make data-driven web applications. It will not cover how to create your user interfaces very much. In this section I'll just give some simple examples, some of which don't even follow best practices but are quick and dirty approaches you can try for some proof-of-principle approaches.

User clicked something
Nearly any element in html can have an  function added to it. This includes: is not usually considered the proper way to do things, but if you're sure it's the only thing you want that element to do when the user is interacting it can work for you.
 * buttons
 * text (most easily done with  tags)
 * List items

Here's some simple html/javascript code that would open an alert saying "you clicked me" when the user presses a button:

Update some text on the page
Alerts are annoying, don't use them. Instead have the user's actions change something on the page. Here's an update to the last example where now pressing the button puts some text on the page just below the button: If you plan to make lots of changes to the text inside that, you might instead want to make a global variable like this:


text:
Web App Development with Google Apps Script/Data to spreadsheets

Basic gist
If you collect some data from a user (maybe from an  tag or something) that you want to save to your spreadsheet, you have to send it to the server-side, even though you're using the client-side for all the user interface.

The steps are:
 * 1) Grab data from the html element that the user adjusts
 * 2) Possibly massage the data a little (trim any trailing or leading spaces, for example)
 * 3) use the magic sauce:  !
 * 4) Deal with any response from the server

Get data from input
Here's a simply way to get the data from a textarea element when the user hits "send":

Sending to the server
Once you have some information to send to the server, you have to somehow get it there. That's where the magical  comes in!

Basically you can send some data to the server by calling a function **on the server** that can do stuff there and then return some response.

Here's an example that builds on the one from above. We grab whatever the user enters and we add it to a sheet on the (attached) spreadsheet: Meanwhile on the server (so in code.gs instead of javascript added to main.html):

Hearing back from the server
Often you'll want to hear something back from the server. That's what  is all about. Basically you tell javascript both the server function you want to run **and** the client-side function that should run when something comes back. The syntax is weird, but it works.

Here's an example that augments the last one letting the user know the data has been saved in the spreadsheet:

Meanwhile on the server (so in code.gs instead of javascript added to main.html):


text:
A-level Mathematics/CIE/Pure Mathematics 2/Trigonometry

Secant
The secant of an angle is the reciprocal of its cosine.

$$\sec x = \frac{1}{\cos x}$$

Cosecant
The cosecant of an angle is the reciprocal of its sine.

$$\operatorname{cosec} x = \frac{1}{\sin x}$$

Cotangent
The cotangent of an angle is the reciprocal of its tangent.

$$\cot x = \frac{1}{\tan x}$$

Solving Equations with Secants, Cosecants, and Cotangents
Solving an equation with secants, cosecants, or cotangents is pretty much the same method as with any other trigonometric equation.

e.g. Solve $$-\sec x = 2 + \cos x$$ for $$0 < x < 2\pi$$

$$\begin{align} -\sec x &= 2 + \cos x \\ -1 &= 2\cos x + \cos^2 x \\ \cos^2 x + 2\cos x + 1 &= 0 \\ (\cos x + 1)^2 &= 0 \\ \cos x + 1 &= 0 \\ \cos x &= -1 \\ x &= \pi \end{align}$$

Cotangent identity
$$\tan x \equiv \frac{\sin x}{\cos x}$$ and $$\cot x \equiv \frac{1}{\tan x}$$, therefore $$\cot x \equiv \frac{\cos x}{\sin x}$$

Pythagorean-derived identities
The Pythagorean trigonometric identity states that $$\sin^2 x + \cos^2 x \equiv 1$$. We can divide both sides by $$\cos^2 x$$ to obtain another identity: $$\tan^2 x + 1 \equiv \sec^2 x$$. Alternatively, we can divide both sides by $$\sin^2 x$$ to obtain $$1 + \cot x \equiv \operatorname{cosec} x$$.

Addition Formulae
The addition formulae are used when we have a trigonometric function applied to a sum or difference, e.g. $$\sin(\theta+\frac{\pi}{6})$$.

For sine, cosine, and tangent, the addition formulae are:

$$\begin{align} \sin(A\pm B) &= \sin A\cos B \pm \cos A\sin B \\ \cos(A\pm B) &= \cos A\cos B \mp \sin A\sin B \\ \tan(A\pm B) &= \frac{\tan A \pm \tan B}{1\mp\tan A\tan B} \end{align}$$

Double Angle Formulae
The double angle formulae are a special case of the addition formulae, when both of the terms in the sum are equal.

$$\begin{align} \sin(2A) &= \sin(A+A) = \sin A\cos A + \sin A\cos A = 2\sin A\cos A \\ \cos(2A) &= \cos(A+A) = \cos A\cos A - \sin A\sin A = \cos^2 A - \sin^2 A = 2\cos^2 A - 1 = 1 - 2\sin^2 A \\ \tan(2A) &= \tan(A+A) = \frac{\tan A + \tan A}{1 - \tan A\tan A} = \frac{2\tan A}{1-\tan^2 A} \end{align}$$

Converting $$a\sin\theta + b\cos\theta$$ to $$R\sin(\theta\pm\alpha)$$ or $$R\cos(\theta\pm\alpha)$$
It is helpful when solving trigonometric equations to convert an expression into a single term. To do this, we can use the addition formulae.

e.g. Solve $$\sin\theta + \sqrt{3}\cos\theta = 1$$ for $$0 < \theta < 2\pi$$

$$\begin{align} \sin\theta + \sqrt{3}\cos\theta &= R\sin(\theta + \alpha) \\ \sin\theta + \sqrt{3}\cos\theta &= R\sin\theta\cos\alpha + R\cos\theta\sin\alpha \\ \text{Equate coefficients of }\sin\theta\to\quad R\cos\alpha &= 1 \\ \text{Equate coefficients of }\cos\theta\to\quad R\sin\alpha &= \sqrt{3} \\ \tan\alpha &= \frac{R\sin\alpha}{R\cos\alpha} = \frac{\sqrt{3}}{1} \\ \therefore\alpha &= \frac{\pi}{3} \\ R\cos(\frac{\pi}{3}) &= 1 \\ R &= \frac{1}{\tfrac{1}{2}} = 2 \\ 2\sin(\theta + \frac{\pi}{3}) &= 1 \\ \sin(\theta + \frac{\pi}{3}) &= \frac{1}{2} \\ \theta + \frac{\pi}{3} &= \left\{\frac{5\pi}{6}, \frac{13\pi}{6}\right\} \leftarrow \text{Be careful with the domain of }\theta + \frac{\pi}{3} \\ \theta &= \left\{\frac{3\pi}{6}, \frac{11\pi}{6}\right\} \end{align}$$

Using $$R\cos(\theta\pm\alpha)$$ is pretty similar.

e.g. Solve $$\sqrt{2}\sin\theta + \sqrt{2}\cos\theta = 1$$ for $$0 < \theta < 2\pi$$

$$\begin{align} \sqrt{2}\sin\theta + \sqrt{2}\cos\theta &= R\cos(\theta - \alpha) \\ \sqrt{2}\sin\theta + \sqrt{2}\cos\theta &= R\cos\theta\cos\alpha + R\sin\theta\sin\alpha \\ \text{Equate coefficients of}\sin\theta\to\quad R\sin\alpha &= \sqrt{2} \\ \text{Equate coefficients of}\cos\theta\to\quad R\cos\alpha &= \sqrt{2} \\ \tan\alpha &= \frac{R\sin\alpha}{R\cos\alpha} = \frac{\sqrt{2}}{\sqrt{2}} = 1 \\ \therefore\alpha &= \frac{\pi}{4} \\ R\sin\left(\frac{\pi}{4}\right) &= \sqrt{2} \\ R\left(\frac{1}{\sqrt{2}}\right) &= \sqrt{2} \\ R &= \sqrt{2}(\sqrt{2}) = 2 \\ 2\cos(\theta - \frac{\pi}{4}) &= 1 \\ \cos(\theta - \frac{\pi}{4}) &= \frac{1}{2} \\ \theta - \frac{\pi}{4} &= \left\{\frac{\pi}{3},\frac{5\pi}{3}\right\} \\ \theta &= \left\{\frac{7\pi}{12},\frac{23\pi}{12}\right\} \end{align}$$

 * Notes


text:
Wikibooks:Reading room/Administrative Assistance/Archives/2020/April

Reading_room/Administrative_Assistance/Archives/2020/January
Just to inform. They are back, see this, this and this. Minorax (discuss • contribs)
 * Yes, they never left. And as our filters can't prevent this yet, we may be forced to start a bot to revoke them. JackPotte (discuss • contribs) 11:13, 8 March 2020 (UTC)
 * Its Special:Contributions/2401:4900:0:0:0:0:0:0/34 again. There is basically garbage coming out of this range, I would say that this is the main LTA range on en.wikibooks. The IPs I've looked at all seem to geolocate to Bengaluru, Karnataka, India. Probably using mobile Internet, leading to a broad range for one or more LTA(s).
 * Looking through the contributions I think a block of a few months may deter them a bit (or at least is worth a try). I know this is a pretty large range (about a billion /64 subnets), but it is not very active, around about 300 edits or so since May 2018 when the range became active. Collateral would be low, as I couldn't see many edits that seemed particularly useful. Any genuine contributors could always get accounts, as long as account creation is not blocked. -- Jules  (Mrjulesd) 14:09, 8 March 2020 (UTC)

 * Is it possible to block the range from editing Control Systems & Ada Programming? Minorax (discuss • contribs) 07:32, 5 April 2020 (UTC)
 * . Minorax (discuss • contribs) 09:43, 11 April 2020 (UTC)
 * Some thoughts:
 * Technically, no we can't, afaics. Documentation on the partial-block feature says a partial block can apply to up to ten pages <grumbles about short-sighted design>; those two books between them have more than five hundred pages.
 * I have, btw, [not] found any instructions on how to make a partial block apply to more than one page; the partial-block interface provides a single input field for the pages.
 * Although the range has been vandalizing those two books the most, they've vandalized other miscellaneous pages too. If we had the technical ability to block the range from really large numbers of pages, doing those two books might help a little, but there's also a pretty good chance we'd then be playing whac-a-mole.
 * --Pi zero (discuss • contribs) 01:54, 15 April 2020 (UTC)
 * grrr... This can be suggested in future for partial blocks to include subpages. Minorax (discuss • contribs) 14:23, 21 April 2020 (UTC)


text: Category:Book:End-user Computer Security/Book part/Main content/Chapters/«Broad security principles», chapter 8


text: Category:Book:End-user Computer Security/Hash-tagged/＃Broad security principles


text: Category:Book:End-user Computer Security/Book part/Main content/Chapters/«What to do when you discover your computer has been hacked», chapter 9


text:
Category:Book:End-user Computer Security/Hash-tagged/＃Backing up, backups/＃Backing-up files

The following are relevant to the general subject of backing-up files:

  ⦾  " Wireless Communications " and " Digital storage " chapters   ⦾  " Physical isolation and locks ", " Geospatial ", and " Time based " sections   ⦾  " ＃Tamper, tampering/＃Tamper prevention " book category


text: Category:Book:End-user Computer Security/Hash-tagged/＃Security credentials/＃Changing security credentials


text:
User talk:Abdul turban

Warning
Hi. It starts looking like cross-wiki abuse. Should we end this now? -- Tegel (discuss • contribs) 12:22, 2 June 2020 (UTC)

Be my guest. -- Abdul Turban

Oh, and hi. What starts looking like cross-wiki abuse? And end what? -- Abdul Turban

title: User talk:Abdul turban


text:
Oberon/ETH Oberon/sitemap

ETH Oberon Site Map

ETH Oberon

 * ETH Oberon White Paper
 * Download - all ports
 * Frequently Asked Questions

 * Native Oberon OS beta/alpha
 * ETH Oberon old release
 * Oberon Language
 * Bluebottle
 * Active Oberon for .net

 * Support

 * Oberon discussion list
 * news:comp.lang.oberon

Language

 * Documentation
 * Compilers
 * Genealogy. Also Historical Perspective.

System

 * ETH Native Oberon

 * Release 2.3.6 download
 * Release 2.3.6 notes
 * Beta download
 * Beta change log
 * Beta / Alpha documentation
 * Oberon.Text guide
 * Alpha download
 * Alpha change log
 * Bootstrapping an OS on an x86-based PC, with application to ETH Oberon
 * Master Boot Record, with application to ETH Oberon
 * Using a boot manager, with application to ETH Oberon
 * Booting an OS using another OS, with application to ETH Oberon
 * Booting an OS in a file, with application to ETH Oberon

 * HW Compatibility

 * BIOS support
 * Disk support
 * Diskette support
 * Display support
 * Font support
 * IRQs support
 * Keyboard support
 * Mouse support
 * NIC support
 * Partitioning considerations
 * Ports support
 * Printer support
 * Sound support
 * Speaker support
 * USB support

 * System stability
 * Oberon for Win
 * Oberon for .net
 * Bluebottle
 * Genealogy

Developers

 * Module Library
 * Module Registry
 * Contributions
 * Projects

Bibliography

 * Publications
 * Authors

Miscellaneous

 * Links
 * Oberon tutorial (old)
 * JMLC'2000
 * ETH internal
 * Hall of Fame
 * Site statistics

[Top]

''9 Dec 2002 - Copyright © 2002 ETH Zürich. All rights reserved.''

E-Mail: oberon at lists.inf.ethz.ch

Homepage: http://www.ethoberon.ethz.ch/

title: Oberon/ETH Oberon/sitemap


text: Category:Book:End-user Computer Security/Book part/Main content/Chapters/«Miscellaneous notes», chapter 10


text: Category:Book:End-user Computer Security/Book part/Appendix/Parts/«New security inventions requiring a non-trivial investment in new technology», part 1


text: Category:Book:End-user Computer Security/Book part/Appendix/Parts


text: Category:Book:End-user Computer Security/Book part/Appendix


text: Category:Book:End-user Computer Security/Hash-tagged/＃Security inventions


text: Category:Book:End-user Computer Security/Hash-tagged/＃Programming


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1940 08

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5. - AUGUST, 1940 - No. 3.

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

American-Style Communications Nine. . . . 5

Direct-Coupled Circuits. . . . 15

A Novel Power Unit. . . . 20

GENERAL TECHNICAL —

The A.B.C. of Multi-Range Meter Design. . . . 29

Aerials for Better Reception. . . . 38

AMPLIFIER SECTION —

Amplifier Championship. . . . 23

SHORT-WAVE SECTION —

Review. . . . 31

Loggings. . . . 32

Short-wave Broadcast Station List. . . . 34

JUNIOR TECHNICAL —

Hints and Tips. . . . 40

A Simple Electric Motor. . . . 42

J.T. Queries. . . . 43

Cutting Threads with Dies and Taps. . . . 43

TRADE PARADE —

Air Test of Latest Breville Receiver. . . . 19

Bargains from Invincible Radio. . . . 27

Vealls 1940 Catalogue. . . . 27

New Philips Valve Chart. . . . 27

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 45

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone FL2842. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 14th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietors of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.48)

P.04 - Editorial Notes
PERSONAL

As you open up this month's issue, you will notice that there has been a drastic change in the make-up of the pages. The actual size of each page has been cut down quite a bit. We doubt if it is in any way an improvement, but it is made necessary by the need for conserving stocks of paper, thereby indirectly saving the dollar exchange, thus to allow the purchase of American aeroplanes for the War effort. Regulations have been introduced with a view to cutting down the amount of paper used by about 35%. From a glance at the regulations, it is not clear whether the actual number of pages has to be cut down or whether the saving can be made by any other method which will allow the best possible production to be made without using more than 65% of the paper used previously. We have gone into the matter carefully and we feel sure that the best possible way we could cut would be to cut down the margins, spaces between columns and so on, thereby allowing us to continue to give as much technical information as possible. And so we have this new style, which may not be artistic, but we feel sure that our readers will appreciate that the paper saving is being made and yet the editorial content is being retained, together with the good quality paper which allows the circuits to be reproduced clearly and the photographs to be printed in a way which makes it possible for the experimenter to see just how the original sets were built. Even if the way we have made the saving does not fulfill the requirements of the regulations to the letter, we have an easy conscience, as we feel that we have "done our bit" in making the saving. We also feel fairly safe in the thought that the authorities must surely recognize that a technical journal, devoted to improving the public's knowledge of radio communication, is a little different to a magazine devoted to the publication of doubtful jokes, or love stories. Actually the regulations do not come into force until the next issue, but if the saving of paper is important we felt that we should start immediately. Before the next issue is brought out there may be alterations or amendments to the regulations, but readers can rest assured that, even if we have to save paper, we will maintain our editorial policy to the best of our ability. A. G. H U LL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1940 09

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5. - SEPTEMBER, 1940 - No. 4.

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

The Winning Amplifier. . . . 11

American-Style Communications Nine. . . . 15

Star Battery D/W Five. . . . 17

Velco Crystal Set. . . . 41

AMPLIFIER SECTION —

Amplifier Contest. . . . 5

SHORT-WAVE SECTION —

Review. . . . 30

Help Wanted. . . . 31

Loggings. . . . 32

JUNIOR TECHNICAL —

How to Build a Morse Key. . . . 42

J. T. Queries. . . . 43

Random Jottings. . . . 43

TRADE PARADE —

Air Test of New Stromberg-Carlson Portable. . . . 28

Latest Radiola Model No. 282. . . . 38

New Rola 5-9. . . . 40

Free Catalogue From U.R.D. .. . . 40

Morse Sets From John Martin. . . . 40

Radio Book Review. . . . 40

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 45

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone FL2842. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 14th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

P.04 - Editorial Notes
PERSONAL

The Grand Final of the Amplifier Championship was a great success. We had a night of splendid reproduction, which will long be remembered by the one hundred and fourteen enthusiasts who were present. It is also unlikely to be forgotten by the ten competitors and their assistants who carried the heavy amplifiers up the stairs to the second floor. The whole contest was a wonderful success in every way, notwithstanding the number of entrants who were unable to compete on account of German Measles. A number of entrants, also, had to withdraw as they had "joined up". Let us hope that by the time the Amplifier Championship for 1941 is being held we will all be able to give the contest undivided attention. In the meantime, however, everything possible has to be done to assist the National Effort. The big problem is to keep the production up to standard and yet comply with the Regulations governing the amount of paper which can be used. Incidentally, a number of readers have written to suggest that we should use cheaper paper, and more of it. As it happens, the Regulations do not deal with the quality of paper used, and even if we used the cheapest paper procurable we would still have to limit the number of papers to our present standard. Fortunately, the scheme for cutting down the amount of paper in each issue, by column rules and narrow margins, has been a great success. Without exception, reports indicate that readers prefer the new size and layout. Apparently the remarks I made last month were far too pessimistic. The paper regulations take into account increases in circulation, which is most fortunate, as we have enjoyed a vast demand in the past three months. Stories get around that the shortage of issues has been due to paper shortage, but this is not strictly the truth. Every month for several months past we have increased the actual number printed, but we have not been able to accurately judge the demand. For this issue, however, we have made quite sure by putting through a record number of copies and there should be ample to fill the demand. A. G. HULL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1940 10

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5 - OCTOBER, 1940 - No. 5

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

Reinortz Three. . . . 5

Itsy-Bitsy Mantel Model. . . . 13

Velco Hi-Fidelity Five. . . . 17

TECHNICAL —

Problems With 1.4 Valves. . . . 11

Oscillator Grid Currents. . . . 25

Intermediate Transformers. . . . 27

Don'ts for Battery Charging. . . . 38

SHORT-WAVE SECTION —

Review. . . . 30

Radio Engineer from Japan. . . . 30

The Month's Loggings. . . . 32

TRADE PARADE —

Calstan Portable Reviewed. . . . 28

Ultimate "World-wave" Model. . . . 29

New Trimmers for R.C.S. .. . . 36

Book Reviews. . . . 42

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 41

P.03 - Our Cover
The photograph shows the control room of the R.C.A. sound equipment at the Union Terminal railway station at Los Angeles, U.S.A.

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone FL2842. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 14th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.44)

P.04 - Editorial Notes
PERSONAL

Running a technical radio monthly if a happy job. It is such a friendly business from start to finish that it is hard to call it work. Of course, to a certain extent, it is a matter of birds of a feather flocking together. Being such a keen experimenter myself I find it a most interesting pastime to tinker about in my own laboratory and so I am well able to understand the enthusiasm of readers who have similar feelings and who like to tinker about with circuits and sets in the same way. Another welcome feature of the life is the mail. Every day there is a bundle of letters from readers who tell of what they are doing, of how they are getting along with the various jobs they are working on. Often they give suggestions for articles. These suggestions are invaluable. A good example of the assistance of these suggestions is shown in this month's issue. There are two articles which we feel sure are going to be of much interest and help to our readers, one dealing with grid current in converter valves and the other dealing with the difference in various intermediate transformers. I doubt if there is a hundred to one chance that I would have thought up the subject matter of these articles if they had not been suggested by readers. All readers, no matter whether advanced experimenters or just novices, are cordially invited to write to me. It is not always possible for me to answer each letter individually, and often enough I am so busy that I have to put aside the mail for three or four days before I get time to read every letter carefully. If, by any chance, you have written to me, but haven't received a reply, I do hope that you won't think that I am not interested or that I don't appreciate your kindness. I am pleased to notice that many readers have not forgotten Earl Read, who was formerly editor. Unfortunately Earl's name does not often appear at the heading of articles these days, as he is devoting practically all his time and energy to the business side of the paper. Earl, however, is still keenly interested, and often takes a few minutes off to peek at the mail and keep in touch with the activities of the members of the DX Club and of other readers. A. G. HULL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1940 11

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5 - NOVEMBER, 1940 - No. 6

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

Trans-Port. . . . 5

Straight Four. . . . 13

All-wave Oscillator. . . . 19

Criterion Crystal Set. . . . 24

TECHNICAL —

Direct-coupled Phase-changers. . . . 9

Further Championship Circuits. . . . 12

How to Use a Morse Key. . . . 25

H.T. from Accumulator. . . . 27

SHORT-WAVE SECTION —

Review. . . . 29

This Month's Loggings. . . . 30

Short-wave Stations of the World. . . . 33

TRADE PARADE —

Mardel Fan. . . . 38

Newcomer to Delta Range. . . . 38

Morse Combination Units. . . . 38

Expansion at John Martin's. . . . 39

New Dials by Radiokes Pty. Ltd. .. . . 39

Transverse Cutting Gear. . . . 39

Power Rheostats by I.R.C. .. . . 39

A.W.A. Modulated Oscillator. . . . 39

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 41

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone FL2842. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 14th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.44)

P.04 - Editorial Notes
PERSONAL

In step with the tremendous increase during the past few years in the number of licenses taken out annually in the Commonwealth, the radio service business has advanced to the position where it now must be recognised as a separate industry. The task of keeping over a million receivers in order is a tremendous one; that alone would make the men who perform it a force to be reckoned with, but there are other reasons why servicing as a profession is becoming increasingly more important. Of every one in the chain between set manufacturer and buyer, the serviceman has perhaps the closest and most constant contact with the latter. Once he has obtained the confidence of his clients as a result of his experience and integrity, his recommendations regarding valve or set purchases are generally followed without question. Manufacturers who realise this can build up valuable goodwill among servicemen, and thus among listeners, simply by "servicing the serviceman" — by keeping him supplied with plenty of service data on their receivers and valves. A second reason why radio servicing is now forging ahead is that the serviceman of to-day must of necessity be equipped with a wide and thorough knowledge of radio from both the practical and theoretical angles. With improved methods of manufacturing, sets are being made more and more "breakdown proof," but against this they are far more complex than they were a few years ago, which means that service calls per set average little fewer to-day than they did before the advent of dual-wave receivers, with their host of modern refinements. This increase in complexity also means that the day is well past when radio repair work can be performed by experimenters or electricians with a voltmeter, soldering iron, and a pair of pliers. Elaborate service equipment, plus a thoroughly sound and up-to-date knowledge of radio are essentials for anyone in the service game to-day. The equipment needed is expensive, and the training required means years of concentrated and costly study, but for good men the opportunities offering are endless. As an established profession, radio servicinq is only in its infancy. A. G. HULL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1940 12

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5 - DECEMBER, 1940 - No. 7.

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

D.W. 13/42. . . . 5

Xmas Portable. . . . 7

Tip Top Superhet. . . . 11

Tone Corrector. . . . 30

TECHNICAL —

Speaker Transformers. . . . 15

Dial Tracking. . . . 16

Loud-Speaker Impedances. . . . 18

SHORT-WAVE SECTION —

Short-wave Review. . . . 20

War News Around the Clock. . . . 22

This Month's Loggings. . . . 24

New Members of All-Wave All-World DX Club. . . . 28

TRADE PARADE —

Raymart Range at John Martin's. . . . 29

Kiddies' Xmas Gifts. . . . 29

Special Service at Davis Radio Co. .. . . 29

"Exporters". . . . 29

City Store's Many Years in Radio. . . . 29

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 33

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone FL2842. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 14th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.36)

P.04 - Editorial Notes
PERSONAL

Under the rationing regulations which control the amount of paper we are permitted to use in this production, it appeared most unlikely that we would be able to offer anything in the way of a bumper Christmas issue. Yet we felt that something should be done to produce a special issue which would express the appreciation we feel for the splendid support which readers have given us during the year. Not to be outdone in this resolve we have therefore cut down on this issue to a minimum, getting in as much technical matter as on hand, but squeezing it in to 36 pages. This saving in paper will allow us to carry out the idea of the special Christmas issue, and it should be on sale about a week before the holidays. In this special issue we hope to be able to have at least sixty pages (although we'll have to weigh up on our quota to make sure). In these sixty pages we hope to have some very special articles, including full details of two more championship amplifiers, the rest of the picture diagrams and photos covering the construction of the portable set which is announced in this issue, and also several completely new technical articles. It may seem a little like robbing Peter to pay Paul, but we can only ask your tolerance. Things aren't what they used to be. Which thought brings to mind that if we understand the budget proposals correctly there will be quite an incentive to radio set building, as complete sets carry the 15% sales tax, whilst radio component parts are taxed at only 10%. Why radio sets should be classed as luxuries, and put in the 15% class seems a little hard to understand, as in most homes a radio set is just as much a necessity as the clock on the mantelpiece or the newspaper on the table. However these things come to us, wrapped up in a story of national effort, so that none of us feel any other sentiment than that we have to endure them as best we can. The main thing being to "do your bit" and "carry on." A. G. HULL.

P.28 - Short-wave Section - New Members of All-Wave All-World DX Club
All-Wave All-World DX Club - New Members

AW578DX - A. E. Slater, 40 Kernan St., Nth. Essendon, Vic.

579 - J. Green, 8 Ray Avenue, Vaucluse

580 - W. M. Jackson, 9 Elizabeth St., Tighe’s Hill, Newcastle, N.S.W.

581 - R. Collins, Biala, via Gunning, N.S.W.

582 - H. R. Delarue, 4 East Parkway, Reade Park, S.A.

583 - J. Murray, C/- A. D. Bumess, "Braemar," Wolseley Pk., Wagga.

584 - J. W. McNamara, 73 South Coast Rd., Coledale, N.S.W.

585 - F. U. Wasley, Cottell St., Hyde Park, Townsville, Q'ld.

586 - A. Bryce, Bridge St., Chelmer, Q'ld.

587 - W. J. Hoffman, 27 Gilbert St., Goodwood, Adelaide, S.A.

588 - L. Walker, Fraser Rd., Applecross, W.A.

589 - L. J. Seidel, Drake St., Morley Park, W.A.

590 - K. Corcoran, "Weeroona," Moonbooldool, N.S.W.

591 - R. J. Smith, No. 1, "Wyncroft," 104 Alfred St., Milson's Point.

592 - G. S. Tingley, "Santiago," Hughes St., Potts Point, N.S.W.

593 - Thomas M. Moss, 570 Oak Drive, Hapeville, Georgia, U.S.A.

594 - L. C. Edwards, 32 Parker St., Bassendean, W.A.

595 - E. I. Noble, Barmera, S.A.

596 - C. L. Thorpe, 2 Davey St., Parkside, S.A.

597 - E. J. Stanke, 31 Bertha St., Mount Gambier, S.A.

598 - R. S. Amos, 17 Brooker St., Knoxville, S.A.

599 - E. A. Isaacs, 43 Tupper St., Marrickville, N.S.W.

600 - A. W. Schilling, Nott's Well, S.A.

601 - W. D. Brennan, 842 Railway Cottage, Merredin, W.A.

602 - B. Hamley, Albion Street, Warwick, Q.

603 - L. E. Patison, 44 Lander’s Road, Lane Cove, N.S.W.

604 - C. J. Reed, 389 Geelong Rd., West Footscray, Vic.

605 - A. G. Dix, 43 Combarton St., Box Hill, E11, Vic.

606 - R. Goodrich, Shirley St., Byron Bay, N.S.W.

607 - W. H. Argent, Boston St., Port Lincoln, S.A.

608 - R. S. Carman, 43 Brooker Terrace, North Richmond, S.A.

609 - C. F. Graves, Ringarooma, Tas.

610 - B. R. Parkes, "Cotswold," Woodstock, via Blayney.

611 - J. W. Horn, 23 Kier Avenue, Hurlstone Park, N.S.W.

612 - F. R. Bell, "Keuroma," 9 Thornton St., Five Dock.

613 - K. R. Collishaw, 123 Cheapside St., Maryborough, Q.

614 - R. J. McDonell, 56 Oberon St., Randwick.

615 - A. E. Moore, 18 Brown Street, New Farm, N1, Q.

616 - H. F. Buggins, Castle Rd., Wootton, Woodstock, Oxford, Eng.

617 - J. Shugg, 36 Elm St., Northcote, N16, Vic.

618 - J. G. Bartlett, 33 Arnold St., Underdale, S.A.

619 - L. J. Praske, Burnett Street, Nanango, Q.

620 - B. Attwater, 22 Carr St., Waverton, N.S.W.

621 - W. J. McGrath, "Enda Vale," Mosman St., Charters Towers, Q.

622 - R. Davis, 216 Elizabeth St., Croydon, N.S.W.

623 - E. E. Seward, 102 Denison St., Newtown, N.S.W.

624 - K. Whitley, C/r Dirrawan Gardens and Currong St., Reid, A.C.T.

625 - A. Beattie, Ridgeway Rd., New Lambton, N.S.W.

626 - W. J. Paul, Commonwealth Bank, Barrack St., Sydney.

627 - M. Foster, Mount Vincent, via East Maitland.

628 - J. M. Edwards, Saw Mill, Cattai, via Windsor, N.S.W.

629 - B. Richardson, Parry St., Charleville, Q.

630 - S. T. Scott, Glen Thompson, Vic.

631 - J. Hendry, 573 Chappie Lane, North Broken Hill.

632 - H. Tesch, Plimsoll St., Greenslopes, SE2, Q.

633 - S. L. Dunstan, Blyth, S.A.

634 - M. Madden, 8 Daphne St., Botany.

635 - L. G. Gray, 8 Mess, H.M.A.S. Perth.

636 - R. Jennings, 134 Arturton Rd., Northcote, N16, Vic.

637 - L. Carswell, Deloraine, Tas.

638 - Kenneth B. Mitchelhill, "Ingleword," Muscle Creek, Muswellbrook.

639 - William Ryan, Wallaville, via Bundaberg, Q.

640 - William Carlyle Johnston, High St., Coff’s Harbour.

641 - J. G. Walsh, 39 Murphy St., Wangaratta, Vic.

642 - P. W. Brunt, 1 Dorris St., North Sydney

643 - Richard Nightingall, 79 Mount St., Heidelberg, N22, Vic.

644 - J. W. Lauder, Box 20, P.O., Tumbarumba, N.S.W.

645 - A. L. Flegg, Xavier Grove, East Preston, N19, Vic.


text:
User talk:Wattstorch

Can anyone please tell me how to upload pictures on wiki please?

title: User talk:Wattstorch


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1941 01

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5 - JANUARY, 1941 - No. 8

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

Countryman's Six. . . . 5

Xmas Portable. . . . 23

Push-Pull Proposition. . . . 43

GENERAL TECHNICAL —

Scott Communications Receiver. . . . 13

How to Use the "Radio World" A. W. Oscillator. . . . 17

An Interesting Circuit from Western Australia. . . . 20

The "Lilley" Amplifier. . . . 29

The 1940 Circuits. . . . 30

Dobson's Amplifier. . . . 41

A Novelty Set. . . . 51

New Laboratory Service. . . . 55

TRADE PARADE —

Latest Kriesler Release. . . . 49

Two Attractive Receivers from S.T.C. .. . . 53

Fan Disc Locking Washers Now Available. . . . 54

City Store's Entry into Manufacturing Trade. . . . 54

Spitfire Dial. . . . 54

New Philips Valve Booklet. . . . 54

SHORT-WAVE SECTION —

Review. . . . 32

Loggings. . . . 35

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 57

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone MA2455.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.60)

P.04 - Editorial Notes
PERSONAL

Rapidly drawing to a close, the year 1940 has been full of interest to me. Cutting adrift from the "old firm" after ten years, it was a big step to take over the "World," especially in such troublous times. Fortunately, the venture has been a grand success, and with the valuable assistance of Earl Read, have been able to make a lot of progress. With the New Year looming up, however, thoughts turn to New Year resolutions. To stand still is to go backwards, and so we have in mind several ideas which we expect to improve the style of the paper. Maybe a few of these will share the usual fate of New Year resolutions, but let us hope that some of them will be found practical. Day by day, it seems to be indicated more clearly that deeper and deeper technical articles will be required to satisfy the demand from radio engineers, servicemen and enthusiasts who are all progressing at a fast rate. A couple of years ago, our readers were interested in articles on how to use a multi-meter, then they became interested in using oscillators, then valve and circuit testers. It looks as though, in the New Year, they will be interested in cathode ray oscilloscopes, having already obtained and mastered the simpler test equipment. Advertising is likely to follow a similar trend, as most of our readers already possess the simpler types of receivers and test equipment. They are now interested in more advanced circuit designs and in more advanced test equipment. We feel that, in this progress, we must set the pace, and so that is one of our modest (?) New Year resolutions. Another resolution is to go into the matter of posting out all copies in flat envelopes instead of rolling or folding. We know that it is much nicer to open up a magazine after it has been posted flat, and the only real drawback to the scheme is the cost of the necessary envelopes. As is to be expected in the highly specialised field we cover, our direct subscribers are a big proportion of our total circulation and the bill for the envelopes, even at less than a half-penny each, would be quite beyond us. It seems, therefore, that an extra charge of 6d. per annum will be necessary for this special posting service. A. G. HULL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1941 02

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5 - FEBRUARY, 1941 - No. 9.

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

The Club Special. . . . 11

Local-Tone Four. . . . 13

The Standard Crystal Set. . . . 30

GENERAL TECHNICAL —

Compensated Acoustics. . . . 5

TRADE PARADE —

Counter Checkers. . . . 29

Two Mullard Portables. . . . 28

Free Foxradio Order Pads. . . . 28

Mullard Valve Chart Reprinted. . . . 28

SHORT-WAVE SECTION —

Loggings. . . . 18

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 33

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone MA2455.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

P.03 - Editorial Notes
PERSONAL

As regards the number of pages, this issue is not up to our standard, due mainly to the holiday season spreading over into the New Year. Paper rationing makes it impossible for us to waste paper, so we have cut down on this issue. By doing so we allow ourselves ample paper for a bumper March issue. Several feature articles have not been quite ready for this February issue and have been held over. The March "Radio World" should be easily the biggest and best issue ever produced. Getting back to this February issue, however, the quality of the editorial matter should go a long way towards making up for the lack of quantity. Our feature article, dealing with every aspect of circuits to provide compensated acoustics, is surely one of the finest and most comprehensive technical articles ever published in Australia. The many factors involved are covered by an engineer who really knows his subject. We make no apology for the length of this article, for we feel sure that it contains valuable information which will be appreciated by all radio designers and enthusiasts. A. G. HULL

P.18 - Short-wave Section - Loggings
The Month's Loggings

ALL TIMES ARE AUSTRALIAN EASTERN STANDARD

AUSTRALIA AND OCEANIA The Department of Information can feel justifiably proud of the short-wave broadcasts to overseas. The letters I have seen, particularly from America, speak in eulogistic terms of the service, and the A.B.C. and the Postmaster-General's Department must feel equally pleased with the kind references to the quality of the transmissions. Listeners have probably noted that the transmissions are now directed to New Caledonia, French Oceania, North-East Asia, South-East Asia, North America, Latin America, South Africa, the British Isles and the A.I.F. in Palestine. The transmissions to Europe were discontinued some time ago. VLQ-8, Sydney. 17,800kc, 16.85m Very good from 7.05 to 7.50 a.m. in Transmission VIII. to Latin America, in which news and a talk in Spanish is heard. Strong 7.30 a.m. (Beattie, Gaden. Taylor). VLQ-7, Sydney. 1,880kc, 25.25m Excellent qt 5 a.m. and 6.30 a.m. (Cushen, Keats). Strong 8.15 to 8.45 a.m. (Bantow, Flegg). Excellent at 4 p.m. (Cushen, Deppeler, Knewstubb, Nelson, Beattie, Mitchellhill, Gaden). Schedule: Trans, V. to North America, 1.25 to 2.10 a.m.; Trans. VII. to British Isles, 6.25 to 7 a.m.; Trans. IX. to North America, 7.55 to 8.45 a.m.; Trans. X. to North America, 3.55 to 4.45 p.m.; Trans. to A.I.F. in Palestine, 5 to 5.30 a.m. VLQ-2, Sydney 1,870kc, 25.27m .Schedule: Trans. I. to North-East Asia, 9.40 to 10.15 p.m. Trans. IV. to South-East Asia, 1.10 p.m. to 12.45 a.m. Several reports have come in for loggings previous to above schedule, so are not shown for obvious reasons. VLR-7, Lyndhurst 1,840kc, 25.33m Schedule: Relays A.B.C. National programmes from 6.30 a.m. to 6.15 p.m. Good reliable day signal (all reporters). VL W-3, Wanneroo 1,830kc, 25.36m Schedule: 8.30 a.m. to 1.45 a.m.; 1.30 p.m. to 8.45 p.m.; Sundays, 9 a.m. to 2.15 p.m.; 3 p.m. to 8.45 p.m. Good in afternoons (all reporters). VLQ-5, Sydney. 9680kc, 30.99m Trans. Il. to North America, 10.20 to 1.05 p.m.; Trans. VI. to South Africa, 4.10 to 4.45 a.m. Strong at 10.15 p.m. (Nelson, Bantow, Stanke, Flegg, Taylor, Beattie, Knewstubb, Cushen). (Understand this frequency now used for A.I.F. in Great Britain from 5 to 5.30 p.m. -Ed.) VLQ, Sydney 9615kc, 31.2m Trans. to A.I.F. in Great Britain, 5 to 5.30 p.m.; Trans. I. to New Caledonia and French Oceania, 6.25 to 7.25 p.m.; Trans. to A.I.F. in Palestine, 5 to 5.30 a.m. Good from 5 to 5.30 p.m. (Deppeler, Keats, Flegg, Taylor, Knewstubb). Strong at 10.15 p.m. (Barlow, Stanke, Nelson, Beattie, Callender). VLR, Melbourne. 9580kc, 31.32m Relays A.B.C. programme from 6.30 p.m. till midnight. Good at night (all reporters). VL W-2, Wanneroo 9560kc, 31.38m Trans. IV. to South-East Africa, 1.10 p.m. to 12.45 am. Good nightly (Nelson, Flegg, Knewstubb, Beattie, Keats, Callender, Gaden, Taylor), VLW-5, Wanne.roo 6180kc, 48.54m Trans. VI. to South Africa, 4.10 a.m. to 4.45 a.m. Heard at R6 at 4.10 a.m. (Cushen, Gaden). Fiji: VPD-2, Suva. 9535kc. 31.46m Have heard of an afternoon, but poor quality (Schooth, Knowstubb). Very good at an evening (Beattie, Taylor, Flegg, Nelson, Schooth, Gaden). Being received better thon any Aussie (Gandy). New Caledonia: FK8AA, Noumea. 6130kc, 48.94m Fair around 5.45 p.m. (Deppeler, Knewstubb). Putting in a nice signal lately, and seam to have landed some good and new records (Schooth). (Schedule is: 5.30 to 6.30 p.m. -Ed.) Radio Pacifique, Noumea. 4050kc, 74.07m Heard testing at night, R7 (Taylor). AFRICA Algeria: TPZ, Algiers 12,120kc, 24.76m These people when announcing at 6.25 a.m. appear to say, "Ici Radio d' Algee," give wavelength, also refer to 33.46m and Radio Maroc, 25.13m (Muller, Cushen). (I saw their schedule given as 5 to 7.30 a.m., but they seem to me to close at any time between 6.15 and 6.30 and open up again at 7. -Ed) Heard at good strength every mrnin'i (Cushen, Gaden, Taylor, Keats, Nelson). Good at 6 p.m. (Gaden). TPZ-2, Aigiers 8960kc, 33.48m Same remarks apply re schedule. Strong at 6 a.m. (Nelson, Taylor, Beattie, Keats). Good at 6 p.m. (Gaden). Belgian Congo: OPM, Leopoldville 10,140kc, 29.59m Still good at 5 a.m. (Cushen, Nelson, Flegg, Gaden, Taylor, Keats). Good till closing at 5.45 a.m. (Beattie). Said the other morning, operating simultaneously on 19.67, 25.58, 31.40 and 49.42m (Muller). Egypt: SUX, Cairo. 7865kc, 38.15m Heard regularly with good signal when opening at 4.30 a.m. (Knewstubb). Still good signal till 6.30 a.m. (Nelson, Taylor). French Equatorial Africa: FZI, Brazzaville. 1,965kc, 25.06m Now very weak at 6.30 a.m. ,but audible as late as 7 a.m. (Cushen, Nelson, Taylor, Beattie, Keats, Gaden). Think I heard them one afternoon about 4 p.m. (Beattie, Schooth). (Some time ago FZ1 announced they were on at 4 p.m. a,nd 1 p.m. -Ed.) Morning schedule is 6 to 7. Announced this morning (January 28) that as and from February 1 will be giving an English session from 5.45 a.m, direct to U.S.A. (Muller). French Morocco: CNR -2, Rabot. 1,940kc, 25.13m Heard quite well at 4 p.m. (Beattie). Morning schedule is 4 to 7.--Ed. French West Africa: Senegal: FGA, Dakar (9405kc, 31.90m) Very weak at 5.15 a.m. (Gaden, Cushen, Perkins). R7 at 7 a.m. (Taylor, Keats). Talks in English that were heard every Wednesday and Saturday at 7 a.m, and lately every day seem to hove been discontinued. Fair signal till 7.15 (Nelson). Gold Coast: British West Africa: ZOY, Accra 4915kc, 61.04m See particulars under New Stations in this issue. South Africa: Kenya: VQ7LO, Nairobi .. 6083kc, 49.31 m Good at 4 a.m, with news (Taylor, Cushen, Gaden). Portuguese East Africa: Mozambique: CR78E, Lourenco Marques 9710kc, 30.9m Excellent signal daily (Nelson, Gaden, Keats). Schedule is: 5 to 7 a.m. except Mondays. News, 5.55. CR7AA, Lourenco Marques. 6035kc, 49.75m Badly interfered with at 4.30 am. (Cushen). Natal: ZRO, Durban 9750kc, 30.75m Fair signal, closes at 7 a.m, after relaying B.B.C. news (Nelson). Spanish Morocco: Rodio Falange, Tangiers. 7090kc, 42.31 m 6 to 8 a.m. All Spanish; pretty good signal (Muller). CJR, Tangiers. kc, 31 m band Heard on January 6 at 1.25 p.m. closing at 1.35. Announced in English (Cállender). (Unfortunately Mr. Callender omitted to mention frequency. —Ed.) Tunisia: Radio Tunis, Tunis. 15,650kc, 19.17m May be heard between 2.30 and 6 am. See Station Particulars.

AMERICA Central: Costa Rica: TIPG, San Jose. 9620kc, 31.19m Still reliable, closes at 2.30 p.m. (Cushen, Knewstubb). Excellent signal at 10 p.m. (Nelson, Taylor, Gaden, Keats). I concur. — Ed. TIEP, San Jose. 6695kc, 44.82m Not so good at 10 p.m. (Gaden). El Salvador: YSPA, San Salvador. 10,400kc, 28.55m Hardly audible at 1 p.m. —Keats. Note change in coll-sign.Ed. YSPB, San Salvador .. 6575kc, 45.63m This is a new station often in chain with YSP. Signal good. Heard closing with march at 3 p.m. (Cushen). Guatemala: TG WA, Guatemala City .. (5,170kc, 19.79m R7 on occasions (Cushen). Good tilt 8.15 Monday mornings, sometimes later (Nelson, Beattie, Taylor, Gaden). TGSJG, Guatemala City . 1,440kc, 26.22m Heard on January 6 from 3.30 to 4 p.m., but signal spoilt by Morse station (Schooth). TG WA, Guatemala City . 9658kc, 30.98m Still being heard at 3 p.m. (Knewstubb, Goden). Heard or good strength till 7 p.m. on January I (Nelson). Panama: HP5G, Panama City . 1,780kc, 25.47m Heard testing at 4 p.m. on 1,775kc. Announced HP5G and HOA testing in Panama, Republic of Panama (Cushen). HP5A, Panama City Only heard weakly now after 10 p.m. (Ne) - son, Godeo). (Almost inaudible at Randwick. —Ed.) HP5J, Panama City 9607kc, 31.22m Weak, now, after 10 p.m. (Nelson, Gaden, Keats). Schedule: 10 p.m. till midnight. HP5K, Colon. 6005k.c, 49.97m North: WCBX, New York. 21,570kc, 13.91 m R5 after midnight (Taylor). WCBX, New York. 17,830kc, 16.81 m R7 at 1 p.m. (Taylor, .Keats). WNBI, Boundbrook 17,780kc, 16.87m Not as strong in the mornings as formerly (Beattie, Keats, Gaden). WRU W, Boston. 15,350kc, 19.54m Fair in morning (Beattie, Gaden). Schedule: 5 to 8.35 a.m. News at 6.30 and 7.30 a.m. KGEI, 'Frisco. 15,330kc, 19.56m Have heard this open weakly at 10 a.m. (GacJeni. Heard sometimes from 1.30 p.m. with fair to weak signals (Schooth, Keats, Gaden, Beattie, Nelson). Not very loud but always audible (Cushen, Taylor,. WGEA, Schenectady. 15,330kc, 19.56m Very good at 7 a.m. (Stanke, Taylor,. Beattie, Gaden, Knewstubb, Nelson, Keats). WCBX, New York. 15,270kc, 19.63m Weak at 7.30 a.m. (Taylor, Gaden, Keats). WL WO, Cincinnati 15,250kc, 19.67m Excellent in mornings (Gaden, Beattie. Schooth, Deppeler, Knewstubb, Nelson, Callender, Keats). WPIT, Pittsburg. 15,210kc, 19.72m Heard occasionally at 1 p.m. (Knewstubb, Taylor, Keats, Gaden). KKZ, Bolinas 13,690kc, 21.93m Sundays at 2 p.m. (Taylor, Keats).

WPIT, Pittsburg 1,870kc, 25.26m Heard opening at 6 a.m.; good (Deppeler, Beattie, Keats, Taylor). Nice and clear in 9 a.m. News (Gaden). Excellent signal Sun- . day afternoons (Cushen). Schedule: 6 a.m. to 2 p.m. —Ed. WCBX, New York. 11,830kc, 25.36m) : Opens at 4.30 a.m. with News (Cushen, Flegg, Beattie). Latin-America trans. at 7.30 (Nelson). WRUL, Boston . 1,790kc, 25.45m General opinion is: Best American signal on any band. 5 a.m. to 8.35 a.m. (Cushen, Knewstubb, Flegg, Beattie, Gaden, Rogers, Bantow, Stanke), Good news commentary ,at 6.30 a.m. (Deppeler). WBOS, Boston l',870kc. 25.26m Heard opening at 7 a.m. Very good (Goden). (That upsets my WPIT schedule. —Ed.) WRU W, Boston 1,730kc, 25.58m Heard weakly at 12.30 p.m. broadcasting President Roosevelt's speech (Nelson). Strong, 10 a.m. News (Gaden, Keats). WL WO, Cincinnati . 1,710kc, 25.62m Very good on opening at 8.15 a.m. )Flegg, Beattie, Keats, Taylor). Going well at 10 a.m. (Gaden). KGEI, 'Frisco . 9670kc, 31.02m While general opinion is that signal is poor, there are signs of improvement. Opens at 4 p.m. when WRCA closes and is on till 6 p.m. with good signal, but interfered with by DJ W, 31.09m (Schooth, Gaden, Keats). Just audible at 6 p.m., very disappointing (Knewstubb, Nelson). Bit of a washout in afternoon, but improving (Deppeler). Back here and very poor at 4 p.m. (Cushen). R6 at 5 p.m. Good at 10 p.m. 'Nelson). Seems to have dropped Mail-bag; cood at midnight (Cushen, Flegg, Taylor). Dr. Gaden says, "Improved after 4, ard by 6 full of Pep." WRCA, Boundbrook 9670kc, 31.02m Rivals WRUL in volume, excellent on Sundays till o few minutes to 4 p.m. (Cushen, Schooth, Knewstubb, Gaden, Taylor, Beattie). WCBX, New York. 9650kc, 31.09m Fairly strong a.m. (Bantow, Stanke, Nelson, Flegg, Beattie). • WL WO, Cincinnati. 9590kc, 31.28m Very weak of an afternoon ISchooth, Beattie, Bantow, Stanke). Somewhat weakened; good Mail-bag session at 4 p.m. on Sundays, conducted by Lon Clark (Cushen, Knewstubb I

WCAB, Philadelphia 9590kc, 31.28m Seems to have gone (Cushen). WBOS, Boston 9570kc, 31.36m These people seem to have gone also (Cusherii. (Last mail brought news that they would soon be on the air again. —Ed.) WGEO, Schenectady 9530kc, 31.48m Fine 9 a.m. and 2 p.m. (all reporters). Good strength 6.30 onwards. (Excellent at Randwick at 6.30 and 8.40 a.m. —Ed.) KEI, Bolinas 9490kc, 31.61 m Good when on (Knewstubb). WCBX, New York 6170kc, 48.62m Good in closing at 6 p.m. (Knewstubb, Taylor). This is interesting, as they are only shown in latest odvices as operaeing tor 90 minutes, from 1.30 p.m. to 1 a.m. ES T., or 2.30 to 4 p.m. our time. —Ed.) WCAB, Philadelphia. 6060kc, 49.5m Not as loud as WCBX (Knewstubb). R7 in late afternoon (Taylor). Mexico: XEQQ, Mexico City. 9680kc, 30.99m Excellent (Cushen, Gaden). Fair, but stays on longer than XE W W (Knewstubb). Fair signal sometimes as late as 5 p m. (Nelson, Keats). XE W W, Mexico City .. 9503kc, 31.57m Good from 3.30 p.m. (Schooth, Nelson, Taylor, Keats, Beattie. Gaden, Knewstubb). Excellent at 5 p.m. Better than GSB (Cushen, Deppeler). XEXA, Mexico City. 6180kc, 48.54m Heard till after 6 p.m. on Xmas Day (Cushen). South: Brazil: PSE, Rio de Janiero 14,935kc, 20.08m Thursdays round about 7.15 a.m. (Gaden, Keats, Taylor). PSH, Rio de Janiero. . 10,220kc, 29.35m Very nice at 9 a.m. iGaden). British Guiana: VP3BG, Georgetown . 6130kc, 48.94m This country is in the news again, so maybe this seldom-reported station will bob up again. Seems to be best in winter time round about 7.15 a.m. Ecuador: HCJB, Quito 12,460kc, 24.08m Hardly audible now at noon (Cushen, Taylor). Fair signal from approximately 9.50 to 1 p.m. (Nelson, Beattie). (Mr. Nelson's time is the new schedule. —Ed.)

CB-1180, Santiago 1,945kc, 25.12m Mr. Schooth, of Brisbane, advises it is fair when not drowned by morse. CD-1190, Valdivia .. 1,910kc, 25.19m Very good at 9.45 p.m. (Gaden). CB-1170, Santiago. 1,700kc, 25.64m Can still be heard after 7 a.m. (Gaden). CB-970, Valparaiso. 9730kc, 30.83 m Only reliable Chinon; good till 2.30 p.m. (Cushen ). R6 early morning (Taylor). ¡ From 10 p.m. splendid at my listening post. —Ed.) Peru: OAX5C, coI .. 9430kc, 31.82 m Good in afternoon (Schooth, Taylor. Godeni. Uruguay: CXA-8, Montevideo. _ 9640kc, 31.12m R7 at 4 p.m. Sundays (Taylor). CXA-19, Montevideo. . 1,705kc, 25.63 m Quite good at 7 a.m. (Keats). (This is the earliest this station has been reported. — Ed.) THE EAST Burma: XYZ, Rangoon. 6007kc, 49.94m Fa ny strong at times. News at 12.30 a.m. (Bantow, Cushen, Taylor). XZZ, 3490kc, 86.00m In parallel with XYZ (Taylor). China: XGOX, Chungking .. 15,190kc, 1975 m Fair at 7 a.m. (Gandy). Have logged at mid-day, but only fair signal (Schooth). Heard in English News at 5.20 p.m. (Deppeler, Beattie, Keats). Owing to pressure on space, we have been compelled to omit Germany, Russia, Italy, Cuba, Dutch East Indies, French Indo China, Hong Kong, Phillipines and Notes From My Diary. FFZ, Shanghai 12,090kc, 24.83 m Fair at 10 p.m. (Nelson. Flegg, Deppeler, Gaden, Bontow, Hastings, Taylor, Knewstubb, Keats). (At times, when free of morse interference, bursts of excellence. — Ed.) XGRS, Shanghai 12,030kc, 24.93 m "The Voice of Europe," notwithstanding announcement that they are on 25.25 m, is just about here and the signal is very good. As before, definitely anti-British. Just before German session, announce "Deutscher Rundfunk Sender Shanghai." —Ed. Much better on this wave-length (Muller, Schooth, Nelson). Com mence English concert at about 7.12 p.m. and announce 25.25 (Hallett). Very st,ong on this frequency (Goden). Address is: 3 Great Western Road. XGRS, Shanghai .. 1,910kc, 25.15m Prior to change was reported by: Hastings, Schooth, Gandy, Knewstubb, Flegg, Beattie, I aylor, Keats. XGOY, Shanghai 1,900kc, 25.2I m News at 8.15 p.m. (Beattie). Strong at 9.15 p.m. (Gaden, Nelson, Keats, Taylor, Knewstubb, Bantow, Stanke, Gandy, Flegg, Hastings). XMHA, Shanghai 1,885kc, 25.24m Note change in frequency. Hère is another Shanghai station that has improved with a change in wave-length. Very strong now (Gaden, Muller). XGOK, Canton 1,605kc, 25.75 m Strong each night (Hastings, Schooth, Nelson, Hogg, Goden, Taylor, Keats, Beattie). News at 10.30 p.m. —Ed.) XGOA-XGOY, Chungking . 9710kc, 30.9m Now heard well nightly. Both call-signs given (Nelson). Good at 12.15 a.m. (Flegg, Knewstubb I. XPSA, Kweiyang 8540kc, 35.10m Opens at 9.15 p.m. Terrific signal (Knewstubb, Nelson, Beattie, Keats, Gaden). XGOY, Chungking. 9635kc, 31.14m Note slight change in frequency. Midnight to 12.55 a.m. News at 12.30 a.m. XHHB, Shanghai 7970kc, 37.6 m Being reported again, but have riot verified

my report of last January (Cushen). Heard occasionally (Keats). Portuguese China: CRY-9, Macao. 6080kc, 49.34m Weak Monday nights. Hastings, Taylor, Rogers. Almost blotted out by morse Cushen. Thai: HS6PJ, Bangkok. 19,020kc, 15.72m Good station on Monday nights from 1 p.m. till 1 a.m. (Nelson, Taylor, Keats,. HSP5, Bangkok 1,715kc, 25.61 m Fair signa), but interference bed (Nelson, Taylor, Keats, Flegg). Mr. Pepin, Maylands, W.A., advises hearing Thai on 32 metres, but gives no time. This would be a new frequency for them. We used to hear them on 7968kc, 37.65m, nightly with exception of Mondays. GREAT BRITAIN "This is London calling; you are listening to a News Bulletin in the overseas service ot the British Broadcasting Corporation." What comforting words —a sure sign all's well. It you should detect a slight weariness when Robert Harris or Bob Dougall (the latter says he never exceeds 120 words per minute) are reading the News, there is some justification for it. Do you know the conditions under which the B.B.C. staff are compelled to work? At 10.30 each night a uniformed officer requests quiet from everyone, and in the great concert hall at Broadcasting House —women on one side, men on the other — with curtains between them, settle down to snatch what rest they can, or what repose is possible during a bombing raid. But there are others who are not sleeping; they are telling America from midnight till 6 a.m, what is happening in London. And right through the night news in every language is going out on the air, telling the truth, the truth that many a European risks the death penaity to hear, now going out in thirty foreign languages, occupying 144 hours a week in the telling, as compared to 16 languages, taking 66* hours, a year ago. And then there is the staff preparing short snappy programmes of light entertainment. And, don't forget, the choice of entertainment is the result of a world-wide questionnaire, so if it does not please you, somebody, and presumably a large number, asked for it. And all the time the engineers ore keeping the transmitters on the air — "This is London calling. Here is the News." GST 21,550kc, 13.92m Excellent at 9 p.m. (Gaden, Flegg, Beattie, Keats, Taylor). GSH 21,470kc, 13.97m Fair after 9.30 p.m. (Gandy, Gaden, Nelson, Taylor, Keats, Beattie). GSV 17,810kc, 16.84m Splendid at 10 p.m. (Stanke, Flegg, Beattie, Keats, Taylor). GSG 17,790kc, 16.86m Fair after 9.30 p.m. (Gaden, Gandy, Deppeler, Taylor, Keats, Beattie, Schooth, Nelson). (Definitely going off. —Ed.) GSP 15,310kc, 19.60m Good in morning (Stanke, Schooth, Taylor, Flegg, Keats). Weakest of the Daventry stations at 6 p.mf (Beattie).

Good after 5 p.m. (Gandy, Schooth). Loud at night (Nelson, Keats, Taylor). GS0 15,180kc, 19.76m Good from 9-11 p.m. (Keats). • GSF 15,140kc, 19.82m One of the best signals on the dial (all reporters). I Excellent at 1 p.m. —Ed. GSE 1,860kc, 25.29m Good afternoon and night (all reporters). GSN 1,820kc, 25.38m Very good, 6.30 to 7 a.m. (Gaden). Good at night (Beattie, Taylor, Keats). GSD 1),750kc, 25.53m Splendid whenever on all reporters). Best transmitter in 8.55 p.m. to midnight session (Gaden, Nelson). (In this I thoroughly concur.--Ed.) GRX 9690kc, 30.96m Very good in. late evenings (Schooth, Nelson, Keats, Taylor, Gaden). Fair strength in European service at 6.30 p.m. (Deppeler). (I think this transmitter is now dispensed with in evening session. —Ed.) GRY 9600kc, 31.25m Very good early morning (Flegg, Keats, Taylor, Gaden). (This is the African session from 5.30 a.m. to 8.25 a.m. It is also heard from 8.55 to 10 p.m. —Ed.) Fair 9 p.m. (Beattie). GSC 9580kc, 31.32m Very good 6.30 to 7 a.m. (Gaden, Keats). Good in evening (Flegg, Beattie, Taylor). GSB 9510kc, 31.55m Excellent from 5 p.m. (Schooth, Gandy, Deppeler, Nelson, Keats, Beattie, Callender, Flegg, Taylor). •'U" for unity. Appears to open at midnight. Very loud, but morse often on top (Hallett, Muller). (Not certain, but think this is on in afternoon in Italian session. -- Ed.) GS W 7230kc, 41.49m Seems to have been discontinued. 7132kc, 42.06m Heard at 6 a.m. (Muller).- GR W 6140kc, 48.82m Another that appears to have become silent. GSL 6110kc, 49.10m Midnight to 2.30 a.m. Very good in mornings (Muller). Schedule is: Midnight to 8.30 a.m. (Cushen). One of the loudest and clearest of the morning stations.---Ed. GSA 6050kc, 49.59m Excellent (Schooth, Taylor). Schedule: 3.30 to 8 p.m., midnight to 2.30 a.m., 2.55 a.m. to 8.30 a.m. EUROPE Holland: PCV, Amsterdam 18,070kc, 16.6m Only noise on carrier now audible (Nelson, Keats, Gaden, Beattie). PCJ-2, Huizen 15,220kc, 19.71 m Opens at 9.30 p.m. (Nelson, Gaden, Bantow, Stonke, Taylor, Keats, Beattie). (Subject to the swirling noise on PCV.—Ed.) Italy: (Source of supply counted as Rome) IR W 19,520kc, 15.37m Very good with News at 1.35 p.m. (Flegg, Keats, Beattie).

Vatican City: HVJ 15,120kc, 19.84m Still puts over "Cheerio" on a Friday afternoon (Schooth). HVJ 6190kc, 48.47 m R6 in mornings (Taylor). (English session is: 5.15 to 5.30. —Ed.) Portugal: CTV-2, Monsanto .. 1,148kc, 26.91 m Heard at 3 a.m. one morning going at lull strength (Gaden). (This is fine business cnd a new one to our readers. —Ed.) CS W-6, Lisbon. 1,040kc, 27.17 m Very good at 5 a.m. (Cushen, Taylor, Beattie, Knewstubb, Fleag I. Best on any band at 6 a.m. (Keats). CS W-7, Lisbon 9740kc, 30.8 m Fairly good at 7 a.m.; lot of C. W. (Nelson, Flegq, Keats, Beattie, Gaden). Roumania: Radio Bucharest . 9245kc, 32.45 m Weak at 6 a.m. (Keats). Now closes at 6.30. —Ed.) Spain: EAQ, Madrid 9860kc, 30.43 m R4 in mornings (Knewstubb, Nelson, Keats). EAJ-9, Malaga 7220kc, 41.55m Very good in mornings (Schooth). Radio Espagna, San Sebastian, 7210kc. 41.6 m Fair at 6.30 a.m. (Nelson). Radio Malaga, Malaga. 7120kc, 42.1 m Someti mes heard at fair strength at 6.30 a.m. (Nelson). Switzerland: HBH, Geneva 18,480kc, 16.23 m R7 at midnight on Fridays (Taylor, Keats). Radio Suisse, Schwarzenburg, 1,870kc, 25.28 m R7 at 10 p.m. (Taylor, Beattie). Radio Suisse, Schwarzenburg, 6165kc, 48.66m Not heard during lost week. —Ed Yugoslavia: YUF, Belgrade ..15,240kc, 19.68 m Still heard with fair signals from 5 to 6 p.m. (Beattie, Nelson, Taylor, Keats). Not heard lately (Schooth). Hear These Stations Yourself e Build the... CLUB SPECIAL Fully described in next month's issue • ORDER YOUR COPY NO W! YUC, Belgrade 9505kc, 31 56m R7 at 6.30 a.m. (Taylor). SCANDI NAVIA Norway: LKQ, Oslo. 1,735kc, 25.57 m Not as good in the mornings as o few weeks ago (Schooth, Taylor, Keats). Heard very weakly at 4 p.m. (Beattie, Keats). MISCELLANEOUS Arabia: ZNR, Aden 12,110kc, 24.76m Heard from 3 to 3.35 a.m. R6, Q4 (Cushen, N Z.). Later: Only heard once at good strength. Very weak now (Cushen). (This was erroneously shown in last issue as: From 1) p.m. —Ed.) Canada: CKFX, Vancouver 6070kc, 49.42m Heard best at 5 p.m., closes at 5.30 on week days, 7 p.m. on Sundays (Cushen). Greece: SVJ, Athens .. 9825kc, 30.54 m Mr. Taylor, of Mosman, says he is hearing this station RS at midnight.

SV M, Athens .. 9935kc, 30.196m Heard on January 18 at 6.19 a.m, announcement in English, "This is Athens. We will open again to-morrow at 8 p.m. Station left air at 6.20 a.m. IMullerl. Later: 5.45 to 6 a.m. in English. Territic signa). — Ed. SV:M, Athens . 7075kc, 42.4m According to advice given to me by the Secretary to the Greece Consulate-General, Athens on 7075kc, 42.4m are broadcasting news in 14 different languages from 4.45 to 8.50 a.m. English was listed for 7 a.m. So far I cannot truthfully soy I have heard them, although on their frequency o carrier was picked up but far too weak to learn who it w as. I rang my friend, Mr. G. Muller, a cha mpion at early morning stations and able to speak several languages, feeling certain if it could be heard he would get it. While hunting he happened on 30.10 and was astounded to hear the statement shown just above this paragraph. 23/1/41: Mr. Muller rang today: "At 5.40 J.M. this morning, heard Athens on 30.19 in Italian. At 5.45 a.m, they piayed what nounded like an anthem, previously 'God Save the King.' Then in English, 'This is Athens speaking. In order to ensure better reception in the United Kingdom we are broadcasting on a third wave-length, which is 30.196m or 9935kc. We ore on the air only from 7.45 to 8 p.m., G. M.T., or 9.45 to 10 p.m., Athens time (5.45 to 6 a.m., Sydney time). Call-sign is SV M.. We are also on 42.4m and medium wave 499.2m or 6)1 kc." Signal on 30.19 is excellent. (Owing to noise, could not hear them, but on 30.19 strong signal. —Ed.) Iran (Persia) : EPB, Teheran . 15,100kc, 19.85m Heard clock striking 12 at 7 p.m. our time on January 7 (Gaden). ¡Schedule is supposed to be: 6 to 8.30 p.m., but, while I heard what I took to be this station on January 15 at terrific strength at 7.50 p.m., it continued until DJL on almost the so me frequency "put . them out of business." Whether "Lord How-Haw" talked the m down or whether they became disguested, I don't know, but they soon faded out. I have not heard the m since. —Ed.) EQC, Teheran .. 9680kc, 30.99m Heard fairly well around midnight. Schedule is: 1.45 p.m. to 2.45 p.m. EQB, Teheran . 6I55kc 48,74. m Better thon recently at 5.30 a.m, and quite good and clear when closing at 6 on January 7. Schedule is: 3 to 6 a.m. —Ed. Turkey: TAQ, Ankara 15,190kc, 19.74m Only fair of an afternoon (Schooth). Good with News at 9.15 p.m., strong at 10.15 ¡Nelson, Callender, Bartow. Stanke, Schooth, Gaden, Beattie, Keats). TAP, Ankara 9465kc, 31.70m Good in mornings (Schooth, Deppeler, Knewstubb, Nelson, Flegg, Taylor, Garlen, Beattie, Keats). (Schedule is: Midnight to 6.30 a.m., News at 4.15, and on Sundays a talk in English at 5.50. —Ed.) Location Unknown: "Christian Peace Movement," 9440kc, 31.76m 5 to 6 a.m. Talks, hymns, etc., in English (Muller). (See announcement under "New Stations"). Have now moved to 31 46m (Muller). German Freedom Station . 9804kc, 30.6m Our old friend of last year. Opens at 6 a.m, and on air for about forty-five minutes. Signal quite good. Opens with familiar "Achtun.g! Achtung!" (Muller). Also heard weakly at 8 p.m. (Muller). My 41 m Stranger: This station, which plays "God Save the King" punctually at 6 a.m., is being heard again by Mr. Muller, but morse, opening sharp at 6, prevents call-sign and location being heard. (The morse culprit, t think, is VJR, Rockhampton. —Ed.)

WITH THE REPORTERS
I am truly grateful to the twenty-two Reporters who have enabled me to prepare such a fine list of loggings this month. They are:—

Wm. Bantow, Edithvale, Vic.

A. Beattie, New Lambton, N.S.W.

H. A. Callender, Hobart, Tas.

A. T. Cushen, Invercargill, N.Z.

A. Deppeler, Edmonton, Q.

A. L. Flegg, Melbourne, Vic.

Dr. K. B. Gaden, Wallumbilla, Q.

N. E. Gandy, Wellington, N.Z.

R. Hallett, Enfield, Sydney.

D. J. Hastings, Ashgrove, Q.

B. W. Keats, Launceston, Tos.

E. Knewstubb, Lyttelton, N.Z.

K. B. Mitchelhill, Muswellbrook, N.S.W.

G. Muller, Newtown, Sydney.

S. I. Nelson, Cairns, Q.

W. H. Pepin, Maylands, W.A.

H. Perkins, Malanda, Q.

M. Rogers, Hunter's Hill, Sydney.

R. C. Schooth, Deagon, Q.

P. L. Smith, Dunsborough, W.A.

E. J. Stanke, Mt. Gambier, S.A.

R. Taylor, Mosman, Sydney.

Gentlemen, I thank you. Will be glad to receive reports for March issue by February 10.

Station Particulars
(Under this heading, as space permits, we will give brief details of stations) (See October, December and Xmas issues for previous notes) AFRICA (continued) Kenya VQ7LO, Nairobi (6083kc, 49.31 m): 2.15 to 5.15 a.m. News at 2.30 and 3. This is one of the old reliables and is easily identified by frequent male announcements, "This is Nairobi calling." Owned and operated by Cables and Wireless Ltd., Box 777, Nairobi. Nairobi, with a population of 24,500, is the capital of Kenya Colony, and the centre of the Uganda railway and for big game shooting. Kenya Colony is the new name for British East Africa. VQG3, Nairobi (10,730kc, 27.95m ) : This station has been reported as heard weakly, carrying the same programme as VQ7LO. No details available so far. Mozambique CR7BE, Lourenco Marques (9710kc, 30.9m) : Daily except Mondays, 5 to 7 a.m., with news at 5.55. Of the 6 or more frequencies allotted to the Radio Club de Mozambique, this, and that which parallels with CR7AA, 6035kc, 49.75m, are the two most likely to be heard in this country. The latter has been reported audible at 2 a.m., but at that hour fades quickly and sometimes right out. Identification apart from announcements is helped by an interval signal consisting of chimes in groups of ,four notes cadenced "Fa re mi do," precede transmissions. Closes with "A Portuguesa National Anthem." Power is 10 k.w. Owned and operated by Radio Club de Mozambique, P.O. Box 594. Lourenco Marques is a port and the capital of Portuguese East Africa on Delagoa Bay. Population, just under 10,000. The allotted frequencies are: CR7BI, 17,915kc, 16.63m; CR7BG, 15,285kc, 19.62m; CR78E, 9710 kc, 30.9m; CR7BD, 15,255kc, 19.66m; CR7AA, 6137kc. 48.88m; CR7BF, 1,835 kc, 25.35m; CR7AA, 6035kc, 49.75m; CR7BH, 1,718kc, 25.6m; CR7AB, 3490 kc, 85.92m. South ZRO, Durban (9750kc, 30.75m): Midnight to 2.30 a.m.; 2.45 to 7 a.m. •Usually quite good from 3 a.m., fades after 6. ZRL, Copetown (9615kc, 31.23m) : 6.15 P. M. to 2.45 (3.m. ZRK, Klipheuval (6097kc, 49.20m): 3 to 6.50 a.m. ZRH, Pretoria (6007kc, 49.94m): 1.30 to. 7 a.m. ZNB, Mafeking (5900kc, 50.95m) : Schedule unknown, but being heard till closing at 5.30 a.m. The above schedule does not represent the full time the stations are on the air, but have been selected as the most likely sessions to be heard in Australia. If sending reports for which a verification • is expected, enclose an Imperial Reply Coupon and address: The Chief Engineer, South African Broadcasting Corp. ' P.O. Box 4559, Johannesburg, South Africa. Northern Rhodesia VQ2CM, Luanshyo (7500kc, 40.00m) : Present schedule, according to latest advices, is of very short duration — 3 to 3.30 a.m. on Tuesdays and Saturdays. Announces in English and Matabele. However, the unusual ones look more prominent in that QSL album, so if you are lucky, send reports; to: C. Miller, owner and operator, under Government control. Tunisia RADIO TUNIS, Tunis (15,650kc, 19.17m) Said to be off the air since French capitulation, but may bob up again at any time. Although generally heard on this wavelength, are likely to say they are on 19.30m irespective of where they are. May be heard any day between 2.30 and 6 a.m. Programme is chiefly in Arabic and French. Is listed in overseas magazines as on 15,544kc, 19.30m and 15,496kc, 19.36m. While, of course, mail will not be accepted at the G.P.O., Sydney, at present for this territory, the address is: Resident Generale de la Republique France a Tunis State. Gold Coast Colony ZOY, Accra (4915kc, 61.04m): See particulars under New Stations in this issue. Accra is a town and British settlement on the Gold Coast, West Africa, seat of government of the colony. Population, 60,000. Gold Coast is a British West African colony on Gulf of Guinea; population, 2,035,000. As mentioned elsewhere, it is doubtful if this station has the power to reach here, but it is expected that the present range for the Gold Coast colony will be increased to cover the other British West African colonies of Gambia, Nigeria and Sierra Leone, and to Kenya in East Africa. AFRICA Please add to particulars previously given: Call sign of Radio Brazzaville is FZI Call sign of Radio Dakar is FGA Call sign of Radio Maroc II. is CNR -2

===Special Notice to DX Club Members SPECIAL NOTICE to DX CLUB MEMBERS Me mbers of the All- Wave All- World DX Club are advised that they should make a point of replenishing their stock of stationery im mediately, as all paper prices have risen, and we expect that within a few weeks it will be necessary to increase prices by at least 25 %. W hile stocks last the following stationery is available at the old prices, as shown. REPORT FOR MS. —Save time and make sure of supplying all the infor mation required by using these official for ms, which identify you with an established DX organisation. Price 1/6 for 50, post free. NOTEPAPER —Headed Club notepaper for me mbers' correspondence is also available. Price .. .. 1/6 for 50 sheets, post free. DX CLUB STICKERS. —Enlarged two-colour replicas of the Club badge, in the for m of gu m med stickers, designed for attaching to envelopes, QSL cards, etc. Price. . 5 dozen for 1/6, post free.

New Stations
NE W STATIONS RADIO FALANGE, Tangiers (7090kc, 42.3 rn : Mr. Gus Muller, of Newtown, rang me, staying he was hearing this station at pretty good strength from 6 a.m. As is to be expected, speech is in Spanish. This is another town that has come into the limelight again and wjll be worth watching. - -, Rome (9765kc, 30.72m(: Another find by Mr. Muller. Puts in a signal louder thon 2R0-3 at 5.30 a.m. Closes at 6.15. Location unknown (9440kc, 31.76m): Still another for which I am indebted to Mr. Muller. This is "The Christian Peace Movement," who speak in English from 5 to 6 a.m. Hymns and frequent quotations from the Bible are heard. At 5.55 announcement: "We are heard every day at 7 G. M.T." (5 a.m. Sydney). No call-sign or location is given, but station leaves the air at 6, after.a hymn. Signal is strong and clear. ZOY, Accra, Gold Coast, Africa (4915kc, 61.04m.): This station was opened on October 24. Power is only small as it is intended to cover the Gold Coast only, but there is a likelihood of it being increased. Schedule: Tuesday, Thursday and Saturday, 2.30 to 3 a.m. Daily, News in French, 4 to 4.30 a.m. Daily, Native dialects, 3 to 4 and 4.30 to 5 a.m. Thursday, Sessions for schools, 1.10 a.m. (This information comes from "The Broadcaster." I doubt if we would hear same here, but it is certainly worth trying. —Ed.) ZNR, Aden, Arabia (12,115kc, 24.76m): A short story was prepared for this, but was 1b71 7 "7 5 THE epo/ a >9 VE5, ULE unfortunately left out of Xmas issue. However, I sent word to several reporters and doubtless word will come back in time for "The Month's Loggings." I received advice from Perth that ZNR was being heard from 3 to 4 a.m., that a man was speaking in "Italian," followed by records but just before 4 a.m. announced, "This is ZNR, Aden, Arabia, broadcasting on 12,)15kc, or a wavelength of 24.76m. We shall be broadcasting again to-morrow night at the some time." I hove made several attempts to hear them but without success. A letter from Mr. Cushen, Invercargill, says, "Thanks indeed for information about ZNR. I listened yesterday morning (December 201 at 3 a.m. and could hear the station very faintly. Tuning away and going back, heard what sounded like Indian announcements. At 3.45 when signal was R6, Q4, a male announced, 'You are listening to short-wave station ZNR, operating on a frequency of 12.11 mc, 24, —m, from Aden, Arabia.' (The announcement was blotted out by QR M). At 3.50 a long whistle was broadcasted till 3.55 a.m., when the station signed." (Aden is a British colony, since April, 1937, 100 miles east of State of Bab-el-Mandeb, Arabia. Area, 75 square miles. Important oil fuel and bunkering State. Population, 46,638. Arabian time is 7 hours behind Sydney. —Ed.) VUD, Delhi (3450kc, 87.00m): This is a new one to me and is introduced by Mr. Cushen, Invercargill, who says, "VUD-2 appears to leave 60.48m at 1.45 p.m. and open here. Signal is good but noisy." And four more from Mr. Muller, of Newtown Rome (15,053kc, 19.93m): Same programme as IR W, 19,520kc, 15.3m. News at 1.35 p.m., Rome (9765kc, 30.72m): Splendid signal till closing at 6.15 a.m. Rome (9683kc, 30.98m): This one with a fine signal also; opens at 6.15 a.m. — , Moscow (7194kc, 41.7m): Very loud till 6 a.m., then dies off. GR W, London (6080kc, 49.34m) : Seems to hove forsaken 48.82 for here. Excellent signal at 6 a.m. Schedule is: Midnight to 8.30 a.m., News at 3 and 6. , London (7132kc, 42.06m): Heard at 6 a.m. Good signal.


text:
Category:TODO/End-user Computer Security book

__HIDDENCAT__

Discussion pages  (labelled according to name of corresponding book page) : =Book cover= Book cover

=Preliminaries section= Preliminaries section

=«Software based» chapter  (chapter 1) = «Software based» chapter  (chapter 1)

=«Passwords and digital keys» chapter  (chapter 2) = «Passwords and digital keys» chapter  (chapter 2)

=«Wireless Communications» chapter  (chapter 3) = «Wireless Communications» chapter  (chapter 3)

=«Digital storage» chapter  (chapter 4) = «Digital storage» chapter  (chapter 4)

=«Some measures that are primarily physical» chapter  (chapter 5) = «Some measures that are primarily physical» chapter  (chapter 5)

=«Mind-reading attacks» chapter  (chapter 6) = «Mind-reading attacks» chapter  (chapter 6)

=«Simple security measures» chapter  (chapter 7) = «Simple security measures» chapter  (chapter 7)

=«Broad security principles» chapter  (chapter 8) = «Broad security principles» chapter  (chapter 8)

=«What to do when you discover your computer has been hacked» chapter  (chapter 9) = «What to do when you discover your computer has been hacked» chapter  (chapter 9)

=«Miscellaneous notes» chapter  (chapter 10) = «Miscellaneous notes» chapter  (chapter 10)

=New security inventions requiring a non‑trivial investment in new technology  [Appendix: Part 1] = New security inventions requiring a non‑trivial investment in new technology  [Appendix: Part 1]

=Example set-ups & implementations  [Appendix: Part 2] = Example set-ups & implementations  [Appendix: Part 2]


text:
Module talk:String

Can't get replace function to replace particular numbers.... more examples please ?
Please see Reading_room/Technical_Assistance.

title: Module talk:String


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1941 03

P.03 - Contents Banner
The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Vol. 5 - MARCH, 1941 - No. 10

P.03 - Contents
CONTENTS:

CONSTRUCTIONAL —

The Club Special. . . . 5

Acoustic Compensated Superhet. . . . 25

GENERAL TECHNICAL —

Compensated Acoustics. . . . 15

Code Practice Oscillator. . . . 40

Radio Tools. . . . 45

TRADE PARADE —

Radiola Review. . . . 41

New Lines from Levenson's. . . . 42

Parts Required? . . . . 42

Paramount Review. . . . 47

SHORT-WAVE SECTION —

Review. . . . 32

Loggings. . . . 34

SPEEDY QUERY SERVICE —

Answers to Readers' Problems. . . . 49

P.03 - Publication Notes
The "Australasian Radio World" is published monthly by A. G. Hull. Editorial offices, 117 Reservoir Street, Sydney, N.S.W. Telephone MA2455.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand.

Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," 117 Reservoir St., Sydney (Footnote P.52)

P.04 - Editorial Notes
PERSONAL

From the papers we learn of the terrible bombing of London; in the news reels we see the awful destruction of the incendiaries; we get an impression of complete ruin and utter desolation. But then, we are fortunate enough to get hold of a copy of an English technical radio monthly, such as the "Wireless World", and it all seems so incredible. We feel that we must pay tribute to this publication, which is maintaining a high standard in spite of the difficulties which abound. That technicians in England should spend their time worrying out the theoretical effects of inverse feedback applications to quiescent push-pull circuits is a certain indication that, in spite of everything, England carries on. The latest issue of "Wireless World" carries a strong support of advertising, and, strangely enough, little of it deals directly, or even indirectly, with war activity. Perhaps it carries a lesson to us in Australia. Australia is playing a big part in this war. Australian troops are participating in spectacular victories abroad. Not so spectacular, but equally effective, is the home effort of the Australian factories, which are really producing war materials. Not all of us can take an active part in either of these activities, and it is plain that our duty is to conserve the normal business and economic life. All of which is an introduction to express our policy of maintaining our editorial standard. We are most fortunate in having the fullest support of our advertisers and as you will notice from this issue, there is no shortage of up-and-coming ideas for technical articles. Our only difficulty is in regard to paper supplies. At the worst, a further shortage may mean that copies will be available only to subscribers and those who have placed regular orders. Already about 90 per cent. of our circulation is ordered in this way, and the effect would be merely to eliminate the wastage of copies which have to lie about on counters on the off-chance of meeting the eye of someone interested in technical radio. Fortunately the "Radio World" has been established for many years and there are few radio enthusiasts who do not appreciate its regular monthly appearance without having to be reminded of the fact. This statement, by the way, is not a reply to those of our readers who have asked us why we have discontinued our own advertising in "Radio and Hobbies". The position is simply that Associated Newspapers refuse to accept it. A. G. HULL