text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 03

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 14 - No. 10; March 28, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

VOL. 14 - MARCH, 1950 - No. 10

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Balcombe St., Mornington, Vic. Phone: M'ton 344.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., 168 Regent St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/Asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; Post free

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by "Post" Newspapers Pty. Ltd., Mornington, for the Proprietor of the Australasian Radio World, A. G. Hull, Balcombe Street, Mornington, Victoria (Footnote P.35)

P.03 - Contents
CONTENTS

Compromising With Sound. . . . 5

What Components Do. . . . 9

Among Our Readers. . . . 16

Broadcasting Policy. . . . 17

Capacity Calculations. . . . 19

Valve Applications. . . . 23

Shortwave Review. . . . 31

European and Other S.W. Stations. . . . 33

A Guide for "New Australians". . . . 33

P.03 - Editorial
EDITORIAL

YOU have no idea just how many minor problems arise in the publication business these days. To obtain intelligent assistance seems to be quite impossible. To operate the many intricacies of a technical publication as a "one-man show" is quite a task. Bogged down with trifles it becomes most difficult to find the inspiration which is such an essential part of really good journalism. The way in which Radio World continues to sell in thousands; the way in which our subscribers renew their subscriptions year after year, makes it quite evident that there is not much need for apology. Yet I know in my own heart that there is plenty of room for improvement. In order to carry out the ideas I have in mind it is necessary to have considerable reorganization. Urgently needed are alert technical representatives in both Melbourne and Sydney to keep contact with the trade. If one, or both, of these can also help with technical articles, so much the better. This issue may be late; the next may be later. I am determined, however, that sooner or later there will be not the slightest need to apologize for the old Radio World. If you can help, whether by taking an active half-share in the business as a going concern, or only by contributing an interesting paragraph for publication, I will be pleased to hear from you. — A. G. HULL.

P.17 - Broadcasting Policy
Broadcasting Policy FROM FRANK TALK. Lack of collaboration between broadcasters also creates other annoying features, which could be easily avoided. You try, for instance, to listen to a musical programme between 7 and 8 p.m.! This time seems to be reserved for a concentrated dose of serials on nearly every Sydney station, two or three often following each other without interval. On Saturday afternoon 5 out of 8 Sydney stations broadcast the same races — as if one or two would not do! After all, there are fortunately still a lot of people who are not interested in horses and would like a larger selection of entertainment programmes for their Saturday leisure hours. In England, the B.B.C. has created a fine scheme, which allows everybody to get the class of entertainment he likes. There is a high, middle and low brow programme on three different stations and you can tune in to what you just feel like listening to. However, programme co-operation would make a wonderful improvement to listeners, stations, and sponsors. We would be able to listen to music, talks, variety, etc., at any time we like, from different stations. We would not have to miss out on any plays or star shows as these would be presented at different times and days. Simultaneous programmes from various stations should cater for different tastes. A symphony will hardly interfere with a variety or comic show, as they appeal to a different type of listener. Here, the A.B.C. could do that, too, if they had more stations available within a certain area. As for commercial stations, this scheme would not work at all, as it would give distinct advantages to popular features. Yes, a great deal could be achieved with a little cooperation.


text:
Eric 6 User's Guide/Editing with Eric/Quick-And-Dirty Editor

Quick-And-Dirty Editor
You want to import some data into a database. To do so, you need to manipulate some of the text for consistency, turning text like this:

and this:

and this:

into this:

A perfect quick-and-dirty project for Python and Eric. You decide that this will be a console-only application – no need for classes or a fancy GUI just to clean up some text files.

Background
It all started innocently enough. You just wanted to see how Covid-19 infections were going in some places near and dear to you, like the UK where you have relatives. The web charts you'd looked at weren't flexible enough to display what you wanted to see. The sites offering them credited the Center for Systems Science and Engineering at Johns Hopkins University (JHU CSSE) as the data source. It turned out that JHU was making the data publicly accessible on github.

Checking it out, you found what looked like .csv files. "Great - I'll just download some of those, open them up in LibreOffice Calc, and knock together some charts of my own."

It wasn't quite that simple. There are global reports and more detailed ones limited to the United States. Your interest was global. There are two types of data files: time series and daily reports.

For the time series, JHU updates three omnibus table each day, for confirmed cases, deaths and recovered. Each table contains location names as rows and dates as columns. The number of cases appears at their intersection. A new date column is added each day. New location rows are added intermittently.

The daily reports contain locations in rows, a Last_Updated column and columns for confirmed, deaths, recovered and active cases, plus, at various times, other data like latitude and longitude.

The report names are in the form " .csv" but when you downloaded a few, they turned out to be in HTML. Looking at the data in your browser, you found you could get the data for a page out as bare text by using the page's RAW button. File, Save in the browser generated a basic csv file. A bit of a hassle, but manageable. You were only looking for a few dates.

You downloaded some data, wangled out your charts and were content.

Time marched on. So did Covid. You kept going back for more. It got tedious. You were less content.

Now, you're a bit of data person and have some basic SQL skills. You knew you could roll up a open source relational database management system (RDBMS) like Firebird and maybe work with it using some kind of GUI tool. “Great,” you thought, “all I have to do is import the data into the RDBMS. Then I can slice, dice and chart to my heart’s content.”

If only life were that simple. You'd been working with the time series reports, but found they didn't fit a database construct comfortably. For example, the reports add a new column for each date. In database terms, that's ALTER DATABASE which is an uncommon way to add new data - more usually it's done by adding a row using INSERT. There were other issues. You decided to work with the daily reports instead, combining them into one big text file to import into the database.

But the daily reports had some problems too. Some of the locations names were inconsistent: in early days “Mainland China” was used, later it was just “China”. “South Korea” became “Korea, South” then “South Korea” again. As the virus spread, coverage expanded to include more countries, provinces/states and US counties. The date format flipped back and forth a few times from m/d/yyyy to yyyy-mm-dd. A unique text key for each location was eventually added. A table of numeric universal IDs (UIDs) for each location was also created, but the UIDs are not used in the main data files, only the combined key text.

It also turns out that the reports are issued daily but the data isn’t necessarily new each day. Some jurisdictions report much less frequently, so including their data for each new date would create duplication.

It became a classic Extract, Transform, Load process.

ETL Plan
Extract fixed location data (Latitude, Longitude, etc) into separate tables for US_Counties, Provinces_States and Countries_Regions with Combined_Key string for each.
 * Mainland China -> China
 * Korea, South -> South Korea

Extract date from Last_Updated column and restructure to ISO date standard (yyyy-mm-dd).

Add Combined_Key column where missing and populate with concatenation of US_County, Province/State and Country/Region.

Drop unnecessary fields.

Write the lines to an output file using the date as the filename.

Once all the files have been processed, combine them all into one big Python set (to eliminate duplicates) and save to a file. Finally, import the data into the database.

Eric – New Project
Start Eric and select Project, New. The Project Properties window will be displayed. It’s mostly self-explanatory. This is a quick-and-dirty text-based project so the Project Type is Console.

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


text:
Eric 6 User's Guide/Editing with Eric

Eric is an excellent day-to-day code editor/debugger.

Edit mode screen shot

Debug mode screen shot

title: Eric 6 User's Guide/Editing with Eric


text:
User talk:LinguisticMystic

Lua Programming/Introduction

title: User talk:LinguisticMystic


text:
Talk:A-level Mathematics/OCR/C4/Introduction to Vectors

I have to say this- Whomever/s work this is - Good job HastagFeaturedArticle! Your welcome, (My designz)|¬-¬|Г_Г|--_--|(Ice)Hamuyi (discuss • contribs) 02:06, 18 June 2020 (UTC)


text:
Annotated Republic of China Case Law/Judicial Yuan Interpretation No. 5

Date
16 August 1952

Issue
Would the personnel of political parties after enacting the Constitution be the public servants under the Criminal Code?

Holding
The personnel of political parties after enacting the Constitution cannot be considered the public servants under the Criminal Code.

Effect
This case law would overturn a case law on 1 December 1934 when Kuomingtang and the Nationalist Government were not yet separated.


text: User talk:2001:8003:F114:4B00:3DDE:F75F:C89A:3924


text:
Irish/Unit 1/Lesson 2

Broad and Slender Vowels
Irish vowels are classified as either broad (leathan) or slender (caol). The broad vowels are a and á, o and ó, and u and ú. The slender vowels are e, é, i, and í.

Broad and Slender Consonants
Consonants are considered broad or slender based on the surrounding consonants. In Irish, if a consonant has a vowel on either side of it (before and after), both vowels must be the same type, either both broad or both slender. So the Irish word for "now" is "anois". The "o" is not pronounced, but it could not be omitted--otherwise the "n" would have a broad "a" on one side and a slender "i" on the other.

This is important because, in Irish, most consonants are pronounced differently in their broad and slender forms. One of the most obvious changes to an English speaker is with the letter "s". A broad "s" is pronounced like an English "s", and a slender "s" is pronounced like an English "sh". Think of two Irish names as examples:

In English-speaking countries, the Irish name "Séan" is sometimes spelled "Shawn", reflecting the pronunciation of "s" followed by a slender vowel. "Súileabháin" is also changed in English-speaking countries, to "Sullivan", with the initial "s" reflecting the broad vowel that follows.

If you've ever wondered why some Irish words, like Seán, Sinéad, and Séamus, pronounce "s" as an "sh" sound, now you know: it's because of the slender vowel that follows it.

Broad and Slender Consonants in English
This may seem like a strange concept, but it actually occurs in English, too. Consider the letter "C". When "c" is followed by a broad vowel, a, o, or u, it is usually pronounced with a hard "c" sound:

When followed by a slender vowel, it it is usually pronounced with a soft "c" sound:

If English is your native language, you probably never thought about that rule--but you follow it instinctively when you see a new word. If you concentrate on properly pronouncing Irish words, you will develop the same instincts in Irish that you have now in English.

Reviewing Broad and Slender Consonants
With that in mind, let's review the consonants we've learned so far in their broad and slender forms:

Some of these differences are subtle, as with "l". Some are more dramatic, such as "bh". And, as we saw with "gh" in the last lesson, sometimes the dialect makes a difference.

The Articles: An and Na
You may have noticed in the last lesson that we translated the sentence:

Léann Niamh leabhar

as "Niamh reads a book." In English, the sentence would be incorrect without the indefinite article "a".

Irish does not have an indefinite article. If a sentence in English would use "a" or "an", in most cases the Irish translation would simply use the noun with no article, as we see above.

However, Irish does have a definite article, the equivalent of the English word "the". In Irish, the definite article used with singular verbs is an.

English uses the same definite article for all nouns, singular and plural. In Irish, there is a separate form of the article, na, used with plural nouns:

Plural Nouns
You'll notice that to say "the books" you also change the word leabhar, book, to its plural form, leabhair, books. Like English (but unlike some other languages, such as Mandarin Chinese), most nouns have different singular and plural forms.

Forming Plurals
Like English again, these plurals can be formed in different ways.

 * Some plurals are formed by slenderising the word's last vowel, altering the ending of a word from a broad syllable like "-ar" to a slender one, like "-air". Many English plurals are formed this way as well; think of "mouse" and "mice".

 * Some plurals are formed by adding the letter "a" to the end. Because "a" is a broad vowel, sometimes this means changing the word's last vowel from slender to broad.

 * Many Irish nouns add a longer plural suffix, like the English "children". There are many different plural endings in Irish, some of which also affect the preceding vowel:

 * Finally, as in any language, some words are irregular--in other words, exceptions--and must simply be memorized.

The first two categories--slenderized plurals and plurals with "a"--are called "weak" plurals, and plurals with other endings are called "strong" plurals. Knowing whether a word has a strong or weak plural form will also tell you something about how the genitive and dative forms of the nouns are formed--but we'll worry about that when we get there.

Learning Plurals
There is no simple set of rules for Irish plurals; beginning learners will need to memorize the plural for each noun. As you learn more you will notice patterns emerging; often nouns with the same endings will form plurals in the same way.

Going forward, when we introduce and drill a noun, we will also note and drill its plural to get you used to the way plurals are formed. If you prefer a rules-based approach, you can find more technical information on the way different genders and declensions of nouns form their plurals in the Nouns reference page.

New Words, New Sounds
Let's look more closely at some of the new words introduced above. First, scéal, meaning story. Scéal and its plural scéalta have a few new sounds in it:

Because the "sc" at the beginning of the word is slender, the "s" is pronounced like an English "sh" sound. The dipthong "éi" is pronounced differently in each dialect. Use the link below to listen to each pronunciation:

Notice also that in the Munster dialect, the "s" in the initial "sc" sounds more like a broad "s" than a slender "sh" sound.

The "c" sound appears by itself in one of our other new words, ceist (question).

Again, the "s" in "-st" is pronounced like an English "sh" because of the slender vowel that precedes it.

The broad and slender "c" sound very similar to English speakers. The broad "c" has the familiar hard /k/ sound found in English, but the slender "c" has a slightly softer /c/ sound, like the "q" in the French word "quoi".

It is worth spending some time now to train your ear to hear these different sounds. Visit this site:

[Minimal Pairs]

Choose a dialect, then find the row with cúis and ciumhais. Don't worry about the meanings; just know that these words are pronounced almost identically, except for the broad and slender initial "c". Listen and try to reproduce the difference.

New Sentences
Now let's use these new words in a sentence. As you learned in Lesson 1, the most common sentence structure in Irish is V-S-O, or verb-subject-object:

Léann Niamh leabhar Niamh reads a book

Let's change this sentence around using our new vocabulary and our new knowledge of articles and plurals.

You'll notice we didn't tell you how to say "Niamh reads the question." You'll learn why in the next lesson.

Exercise 1
Follow the links below to teanglann.ie and listen to how each word is pronounced in the three major dialects of Irish. Try to pronounce each word out loud both before and after you listen to the example. When you reach the end of the list, go back to the beginning. Repeat until you can predict the pronunciation with reasonable accuracy. You don't have to be perfect, but you should not be pronouncing any words in inappropriate "English" ways. As you listen, think about whether the consonants are leathan (broad) or caol (slender)

title: Irish/Unit 1/Lesson 2


text:
User:Polyinsecure

Hello, this page does exist.

About me
I am a person that exists. My internet screen-name is "Polyinsecure".

title: User:Polyinsecure


text:
User talk:Michelle Anne Calvert

Forgiveness
"Forgiveness is more than saying sorry" sang Anna Faris in the movie just friends.

And to many forgiveness comes about when spoken saying just that sorry. Although the Greek translation for forgivenss is "to let go"

title: User talk:Michelle Anne Calvert


text:
English-Hanzi/Vitamin B is usually added to energy drinks

Vitamin B is usually added to energy drinks, many of which added a large quantity of vitamin B, claiming that this will make consumers "without feeling tense within a day."

维生素B通常添加到能量饮料中，其中许多添加了大量的维生素B，声称这将使消费者“一天之内不会感到紧张”.


text:
Eric 6 User's Guide/Extras/Virtual Environments

Virtual Environments
Eric provides easy-to-use and powerful tools for creating and managing virtual environments for projects created in Eric.

Extras -> Virtualenv Configurator can be used to create a virtual environment for a project. Once created, the environment will be added to Eric’s Virtualenv Manager. Any environment within the Virtualenv Manager can be selected in the Start > Run dialog or configured on a per project basis in the Project-> Debugger-> Debugger Properties dialog.

Alternatively, virtual environments created outside of Eric (e.g. with pyenv) can be added to the Virtualenv Manager using the Add button and the resulting dialog.


text:
Wikijunior:Countries A-Z/Azerbaijan/Image rating

=Current image=


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 06

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 14 - No. 11; June 15, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

VOL. 14 - June, 1950 - No. 11.

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Box 13, Mornington, Vic. Phone: Mt. Martha 264.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., Ulster Chambers, Regent St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; Post free

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by The Clyde Press, 608 High St., Thornbury, for the Proprietor of the Australasian Radio World, A. G. Hull, Box 13, Mornington, Victoria (Footnote P.36)

P.03 - Contents
CONTENTS

Reliable Tuning Unit. . . . 5

The Parry Cathamplifier. . . . 7

Resistor Troubles. . . . 13

Testing Small Motors. . . . 15

A Sectional Analysis. . . . 19

Our Technical Directory. . . . 26

Among Our Readers. . . . 28

Short-Wave Review. . . . 31

Speedy Query Service. . . . 34

P.03 - Editorial
EDITORIAL

I read in the "Newspaper News" that broadcasting station 2UE decided to increase their advertising rates (their first rise since 1940) as from April 1st. They advertised this fact, then found that it was impossible to get a printer to print the new rate cards, so they had to postpone the increase until May 3rd. That is not a joke. It is a fair summary of the printing game as I have found it for some time past. To get any printing done at all seems to call for more than mere love or money. To get a printer to tie himself up to a regular monthly periodical seems to be tougher than winning the lottery. All of which is the start of the alibi for the late arrival of this issue. After much battling, quite by accident, I came across a printer fellow who was civil to me. It took some time to recover from the shock, but now he is on the job, and it looks as though it will be possible to have a June issue out on time, if we skip the April and May issues! A sad state of affairs, but the prospects are much brighter. For years past the printing job and its economics have been like the sticky stuff on the fly-paper, holding back any possibility of turning out the sort of periodical I know you would appreciate; so let’s all join in wishing the new printer lots of luck. Yours faithfully, A. G. HULL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 07

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 14 - No. 12; JULY 15, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

VOL. 14 - July, 1950 - No. 12

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Box 13, Mornington, Vic.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., Ulster Chambers, Regent St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; Post free

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by The Clyde Press, 608 High St., Thornbury, for the Proprietor of the Australasian Radio World, A. G. Hull, Box 13, Mornington, Victoria (Footnote P.35)

P.03 - Contents
CONTENTS

Our HI-FI Party for Readers. . . . 5

A Novel Sound System. . . . 6

"The Farmer's Four". . . . 9

"Hamlet Jnr." . . . . 15

A Switched Amplifier. . . . 17

V.F.O. with Power. . . . 19

Interesting T.R.F. Circuit. . . . 21

Ham Notes. . . . 22

Receiver Circuit Designs. . . . 23

For the Practical Man. . . . 30

Foreign Language Broadcasts. . . . 31

Speedy Query Service. . . . 34

P.03 - Editorial
PERSONAL

As announced on page 5 of this issue, I have made arrangements for a get-together of those interested in the subject of quality reproduction. When it comes to the subject of sound reproduction, the laboratory of the Rola Company is probably the best-equipped in the Commonwealth. I have often visited there to hear the latest in speakers, to play around with the latest of imported gramophone outfits. These visits have always been of great interest and I have often said to myself that I would like all my readers to be able to share such pleasures. Now, through the co-operation of the Rola Company, it has become possible for me to extend to you an invitation to be present at a really fine demonstration which has been arranged for 3rd August. At this party I hope that it will be possible to get down to tin tacks on the subject of what is worth hearing and what is not. Reproduction of the highest fidelity, equal to anything yet done in any part of the world, will be demonstrated, as well as filtered effects to show what is lost in realism when the frequency response is restricted. A. G. HULL.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 08

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 15 - No. 1; August 18, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

Vol. 15 - August, 1950 - No. 1

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Box 13, Mornington, Vic.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., Ulster Chambers, Regent St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; Post free

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by The Clyde Press, 608 High St., Thornbury, for the Proprietor of the Australasian Radio World, A. G. Hull, Box 13, Mornington, Victoria (Footnote P.35)

P.03 - Contents
CONTENTS

New Radiotron Amplifier. . . . 5

Receiver Alignment. . . . 7

Home Light and Radio. . . . 11

Amongst Our Readers. . . . 13

The Superhet. Tuner. . . . 15

Time Delay Relay Switch. . . . 22

Amateurs' Activities. . . . 23

B.C.I. Filter For Domestic Receivers. . . . 26

The V.H.F. Man's Page. . . . 27

For Beginners. . . . 29

Emergency Operation. . . . 30

P.03 - Editorial
'''PERSONAL. . .'''

I have not had time to prepare a full report of our Hi-fi Party for this issue. As announced in last month's issue, we offered our Melbourne readers a chance to hear some exceptional reproduction. We expected that we would get an audience of fifty or sixty enthusiasts, but the demand for reservations was so heavy that we were forced to hold four parties, each packed to capacity. Which was very heartening in its way, but brought home to me again so strongly that it is a tough battle to be a one-man organization in the publishing business. With assistance, there is no limit to what can be done with the old "Radio World". I have a wide following which has been built up over many years, but I cannot do everything myself. So I cannot take advantage of the many opportunities offering. Already I have to do all the office work, editorial work, and the many details connected with the publication. I cannot pursue the advertising as well. Yet if I could get more advertising revenue, I could afford to run much bigger and better issues. My rates for advertising have not been advanced since 1936, offering exceptional value to the keen businessman, but I need the services of good advertising representatives to place these facts before those concerned. If there is any person connected with the advertising business who can handle "Radio World", even if in spare time or part time, I will be pleased to make him a generous proposition. A. G. HULL


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 09

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 15 - No. 2; September 18, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

Vol. 15 - September, 1950 - No. 2

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Box 13, Mornington, Vic.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., Chronicle House, Fleet St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; POST FREE

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by The Clyde Press, 608 High St., Thornbury, for the Proprietor of the Australasian Radio World, A. G. Hull, Box 13, Mornington, Victoria (Footnote P.35)

P.03 - Contents
CONTENTS

A Plan for F.M. .. . . 5

World of Radio. . . . 6

Hi-Fi Parties Crowded. . . . 7

Modern Commercial Circuits. . . . 9

Hum in Hi-Fi Amplifiers. . . . 11

Intermediate Frequency Circuits. . . . 14

Among Our Readers. . . . 20

More About the Morse Code. . . . 21

Amateur Activities. . . . 23

Going Up. . . . 25

Short Wave Review. . . . 28

P.03 - Editorial
'''PERSONAL. . .'''

About four years ago, I started an experiment in de-centralization when I established a combined home and office in what was hoped would be inspirational surroundings. It has now been decided that the experiment was a failure. Without going into the many minor problems which arose, it finally became evident that I could not handle affairs properly by such remote control. So now I am making tracks back to the "Big Smoke". It is hoped that, by next month’s issue, I will be able to advise a city address; in the meantime, the old address is O.K. In response to a plea for assistance regarding the business side of the publication, I was fortunate enough to receive an offer from an ex-ham, who has a city office and keen sales staff. A working agreement comes into operation for the next issue. To safeguard the production end was the next problem, and so the latest in high-speed automatic printing presses was ordered from Sweden some months ago and is now on the water. When it arrives I expect to get a working arrangement for its priority operation by an established printer, or else to instal my own complete plant. The de-centralizing scheme was not all loss. The sojourn in the country was like a grand holiday, from which I now return with renewed vigour and a determination to improve the old Radio World until it is worthy of holding its place as the only magazine in Australia which is devoted exclusively to technical radio. — A. G. HULL


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 10

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 15 - No. 3; October 20, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

Vol. 15 - October, 1950 - No. 3

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Box 13, Mornington, Vic.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., Chronicle House, Fleet St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; POST FREE

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by The Clyde Press, 608 High St., Thornbury, for the Proprietor of the Australasian Radio World, A. G. Hull, Box 13, Mornington, Victoria (Footnote P.35)

P.03 - Contents
CONTENTS

Home Truths About Amplifiers. . . . 5

Volume Compression. . . . 7

The Multi-Meter. . . . 11

Audio Frequency Amplifier. . . . 16

Peak Protection Devices. . . . 24

Tops in Tuners. . . . 25

Amateur Activities. . . . 27

Sapphires Hard on Records. . . . 31

Speedy Query Service. . . . 34

P.03 - Editorial
'''PERSONAL. . .'''

A couple of years ago we ran a Special Data and Handbook Issue, complete with Buyers’ Guide. This issue proved an outstanding success, as is often brought home to us by the blank space on the back numbers' shelves. The compilation of such issues, however, calls for so much extra effort, so many more hours of time, that we haven’t been able to get around to tackling another. As most readers understand, we have a heck of a job to get even ordinary issues out on time. Things may be better in the near future, however, so here is a preliminary announcement of another special issue and with it an appeal for your co-operation............. Dealing first with the subject of data. How about dropping us a line if there is anything special you would like to see? Last time we ran the morse code, the international prefixes, the Q code, the broadcast station wavelengths, valve socket connections, circuit symbols, resistor colour codes, coil colour codes, and the frequency allocations. Can you suggest any more? Then there is a big series of constructional articles set down for future issues; quite a technical development programme, in fact. We know to start with a five-valve general purpose set, then a four-valve midget, but what next? Have you any ideas for the plan? What type of circuits seem to have been neglected lately? How many people would build a high-fidelity F.M. set on the off chance that the experimental F.M. transmissions are to become permanent? In fact, any suggestions you care to make will be doubly welcome at the moment, as big plans are being laid for the future. — A. G. HULL


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 11

P.01 - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 15 - No. 4; November 20, 1950

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

Vol. 15 - November, 1950 - No. 4

P.03 - Publication Notes
Published by the Proprietor — A. G. HULL, Box 13, Mornington, Vic.

Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101

Representatives —

In Queensland: John Bristoe, Box 82, Maryborough, Q.

In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington & S.O.S. Radio Ltd., 283 Queen St., Auckland

In England: Anglo Overseas Press Ltd., Chronicle House, Fleet St., London, W.1.

Distributed throughout the World by Gordon & Gotch (A/asia) Ltd.

Subscription Rates: 12 issues - 16/-; 24 issues - 30/-; To N.Z. and Overseas - 12 issues, 18/-; POST FREE

Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic.

Printed by The Clyde Press, 608 High St., Thornbury, for the Proprietor of the Australasian Radio World, A. G. Hull, Box 13, Mornington, Victoria (Footnote P.35)

P.03 - Contents
CONTENTS

A Fine Radiogram. . . . 5

Farmer's 4-watt Amplifier. . . . 9

Valve Checker. . . . 15

Theory — Tone Control Circuits. . . . 19

Capacity Measurement. . . . 25

The Answer. . . . 27

Amateur Activities. . . . 28

Short-Wave Review. . . . 31

Speedy Query Service. . . . 34

P.03 - Editorial
'''PERSONAL. . .'''

Here is the important announcement which I have been leading up to for some issues past. As and from 1st December, "The Australasian Radio World" will be taken over and published by a new Company. As I mentioned in a recent editorial, the publishing of Radio World has been a bit too much of a job for a one-man business, and I have long felt that I was not doing full justice to the wide circle of keen enthusiasts who have supported me. The new Company will have it’s headquarters in Sydney, with Mr. '''Lay. W. Cranch''', A.M.I.R.E., M.W.I.A., as Managing Editor, well known as one of Australia's leading Radio Engineers. With their greater facilities, including overseas tie-ups, the new Company will enable the production of bigger and brighter issues with a much wider appeal. It is planned that the whole production will be more of a team job than it has been in the past, plus closer contact with the radio trade in the various capitals, so that every new development will be covered in detail as soon as it reaches the market. The old features, will, to a large extent be retained, and many new ones added, including television, which will be given greater attention, especially the practical side, thus paving the way for the time when a thorough knowledge of this subject will be highly desirable. Please note the change of address — Room 302, 17 Bond St., Sydney. This is not exactly a farewell, as I hope to continue, one way or another, a close association with the new Company. — A. G. HULL


text:
English-Hanzi/Water is an inorganic, transparent, odorless, tasteless, almost colorless chemical substance

Water is an inorganic, transparent, odorless, tasteless, almost colorless chemical substance. It is the main component of the Earth's hydrosphere and most biological fluids.

水是一种无机，透明，无气味，无味道，几乎无色的化学物质. 它是地球水圈和大多数生物液体的主要成分.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1950 12

P.A - Front Cover
The Australasian Radio World

Registered in Australia for transmission by post as a periodical.

1/6

Vol. 15 - No. 5; December 20, 1950

Associated with Australian Radio & Electronics

COMPOSITE ISSUE

P.B - Preview New Front Cover
Australian Radio & Electronics

incorporating

Australasian Radio World

Registered in Australia For transmission by Post as a Periodical.

THIS PAGE DEPICTS - OUR NEW FRONT COVER AND CHANGE OF NAME

Commencing January, 1951, Issue

PLEASE NOTE NEW ADDRESS

Forward All Correspondence, Subscriptions, etc., as and from 1st December, 1950, to -

THE EDITOR, "RADIO AND ELECTRONICS", 17 BOND STREET, SYDNEY, N.S.W.

Telephone: BU3879; Telegrams and Cables: "CRANLAY", SYDNEY

JANUARY, 1951 - Vol. 6 No. 1

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

THE AUSTRALASIAN RADIO WORLD

Vol. 15, No. 5 - COMPOSITE ISSUE - December, 1950

P.01 - Contents
CONTENTS

New Front Cover — January, 1951, Issue. . . . I.F.

Editorial. . . . 2

R. & E. Television Project. . . . 4

Recording — The Magnetic Tape. . . . 8

Pick-ups — Tracking Errors. . . . 13

Classification of Amplifiers. . . . 17

"Ham" Activities. . . . 21

Short-Wave Review. . . . 26

Speedy Query Service. . . . 30

P.01 - Publication Notes
Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Correspondence: All correspondence, contributions, and enquiries referring to advertising space and rates should be addressed to our Registered Australian Office:

The Editor, "Radio and Electronics", 17 Bond Street, Sydney, N.S.W., Telephones: BU3879, BW7746, Telegrams and Cables: "Cranlay", Sydney

Managing Editor: LAY. W. CRANCH, AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Printed by: Clyde Press, 608 High St., Thornbury, JW2902 (Footnote P.1)

P.02 - Editorial
'''Editorial. . . December, 1950'''

IN this composite December issue, it is our desire to make known — nationally wide — all about the important transformation of "Australasian Radio World" to "AUSTRALIAN RADIO & ELECTRONICS". Last month you were informed that "Australasian Radio World" had been taken over by a new Company, so we have pleasure in taking this opportunity of introducing ourselves to old friends, and new. For your information our Associate Company — Radio & Electronics (N.Z.) Ltd. — has been producing "R. & E.", a New Zealand monthly magazine since April, 1946, and, for some time, this journal has been imported to Australia, wherein it has enjoyed a highly esteemed reputation for the practical manner in presenting technical and scientific literature to its readers. As the circulation of "R. & E." has increased tremendously here, it was felt that, if the journal was produced in Australia, re-edited to suit Australian conditions (whilst maintaining the same high technical standard), we would be in a more favourable position to solicit local advertising from the Australian Radio and Electrical Industry, and thus be able to produce bigger and better issues, which would be mutually beneficial to all concerned — especially our readers. Also, in taking over the rights of "Australasian Radio World" — an old-established journal — and incorporating it into the new "AUSTRALIAN RADIO & ELECTRONICS" it is now possible for us to publish a combined periodical, retaining the best features of both. As an entree, shall we say, to the new combined "R. & E." our Company has just released on the market here, a new publication known as "THE R. & E. DIGEST OF CIRCUITS" Australian Edition — which, in progressive handbook form, covers everything from the simplest Crystal Sets to Multi-valve Receivers, Audio Amplifiers and Test Equipment. Although it is only "just out" on the bookstalls, we greatly appreciate the commending interest displayed to date. Next month, a new year commences — so does your new journal — wherein many and varied topics will be covered, with special attention being paid to a PRACTICAL experimental TELEVISION PROJECT for home construction, by the production of images on a Cathode-Ray Tube Screen, without the use of costly camera tubes, such as Iconoscope, Emitron, Image Dissector, etc. Our close liaison with New Zealand, and other overseas tie-ups, assures Engineers, Servicemen, Dealers, "Hams" and Hobbyists, that our articles will bring to them the latest developments for the advancement of Radio and Electronic knowledge. In conclusion, we wish to extend our sincere thanks for your past patronage, and trust you will remain one of the new Journal’s ardent followers. . . for we shall be "on the beam". . . "Looking After Old Friends — And Looking Forward to New". The Editor and Staff of Australian "Radio & Electronics" can offer our readers and advertisers, no better wish at this momentous time, than that they share with us, the old happiness of Yuletide and the achievements of the approaching New Year and the New Era it brings. — LAY W. CRANCH.


text:
English-Hanzi/Water is essential for all known life forms

Water is essential for all known life forms, even though it does not provide calories or organic nutrients.

水对于所有已知的生命形式都是必不可少的，即使它不提供卡路里或有机营养.


text:
English-Hanzi/When a blood vessel (vein or artery) is injured

When a blood vessel (vein or artery) is injured, the body uses platelets and fibrin to form a blood clot to prevent blood loss. Even without injured blood vessels, blood clots can form in the body in some cases.

当血管（静脉或动脉）受伤时，身体会利用血小板和纤维蛋白形成血凝块，以防止失血. 即使没有受伤的血管，在某些情况下也会在体内形成血块.


text:
User talk:Passengerpigeon

Did you my page?
Hello passengerpigeon. I was working on my "What is a bed?" When I got a notification my page was Requested for deletion? Did you do that thank you. Hamuyi (discuss • contribs) 05:38, 19 June 2020 (UTC)

 * Yes, I did, because you are trying to write an encyclopedia article and Wikibooks is not an encyclopedia. The page is out of scope. Stop the cross-wiki disruption immediately or I will place a steward request to have your account globally locked. Passengerpigeon (discuss • contribs) 05:50, 19 June 2020 (UTC)

Ok, sorry. I won't do it again. --Hamuyi (discuss • contribs) 14:59, 19 June 2020 (UTC)

title: User talk:Passengerpigeon


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 01

Front Cover
Australian Radio & Electronics

incorporating

Australasian Radio World

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

JANUARY, 1951 - Vol. 15, No. 6

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

AUSTRALASIAN RADIO WORLD

Vol. 15 - January, 1951 - No. 6

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

"R. & E." Television Project. . . . 4

Response Compensated P.P. Amplifier. . . . 6

Frequency Modulated Test Oscillator. . . . 17

"Ham" Activities. . . . 25

Short Wave Review. . . . 30

Classified Advertisements. . . . 32

Our Front Cover
An optical pyrometer is used to determine the temperature of experimental magnets undergoing heat treatment in the metallurgical section of the Rola laboratories. Our picture shows the pyrometer being trained on the inspection opening in the door of the electric heat treatment oven, and the calibrated lens system being adjusted until the light seen through it is the same colour as that viewed in the eyepiece which is trained on the furnace.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Correspondence: All correspondence, contributions, and enquiries referring to advertising space and rates should be addressed to our Registered Australian Office:

The Editor, "Radio and Electronics", 17 Bond Street, Sydney, N.S.W., Telephones: BU3879, BW7746, Telegrams and Cables: "Cranlay", Sydney

Managing Editor: LAY. W. CRANCH, AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Wholly set up and printed in Australia by R. V. Byers, 9 Wetherill St., North Lidcombe. 'Phone: UX6681 (Footnote P.1)

P.02 - Editorial
Editorial

MAY the "learned men" of the Nations of the World produce a formula that will enable "peace to reign" in our time, thus allowing us to pursue the science of Radio and Electronics to our satisfaction and for the ultimate benefit of mankind. With the commencement of this New Year, our first Jubilee edition of Australian Radio and Electronics also coincides, and we feel sure that you will appreciate the fact "that no stone has been left unturned" to present to our readers articles on various subjects which adhere to our policy of producing a monthly technical journal, having National coverage, for the advancement of Radio and Electronic knowledge. In this issue the R. & E. Television Project commences, and we trust that readers building this equipment will gain first hand practical knowledge of the subject, so that when T.V. is "on the air" in "X" number of years time, that the Serviceman, Hobbyist and Home Constructor will be able to still hold his own in the new field. For those interested in the reproduction of disk recordings, and for that matter Tape, Wire, or Home Recording, we heartily recommend the P.P.6L6 Compensated Amplifier fully described on page 7 of this issue. Recording engineers have striven for years to give us better and better fidelity of reproduction, with lower noise level, and one method used is to attenuate frequencies above or below a certain frequency range whilst recording, and use response compensation in the playback amplifier. It is for this purpose that the Amplifier described herein has been designed, as both high and low boost, or combination of both, may be obtained without sacrificing threshold level as far as the ear is concerned. Coupled to a good speaker, suitably baffled, you will be delighted with the tone colour that can be obtained. No doubt you have made your New Year resolutions. . . so have we. . . most of which we hope to keep. . . and one of them is to assure you that everything humanly possible is being done to bring out our journal regularly each month and to maintain the high standard of our technical articles. It will be noted that we have obtained 100% co-operation and advertising support from our various friends in the Radio and Electrical Industry, and we commend you to support these people, who have helped us to help you. May we also suggest you mention Australian Radio & Electronics when making your purchases. Finally, we have many excellent constructional articles in the course of preparation, but to list them now would be "spilling the beans," so to speak. We are looking forward to the future with optimism, and trust that the New Year brings to you "everything you wish yourself." — LAY W. CRANCH.


title: User:Toxicscientist12345


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 02

Front Cover
Australian Radio & Electronics

incorporating

Australasian Radio World

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

FEBRUARY, 1951 - Vol. 15, No. 7

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

AUSTRALASIAN RADIO WORLD

Vol. 15 - February, 1951 - No. 7

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

R. & E. Television Project for Home Construction. . . . 4

A Straightforward Narrow-Band F.M. Exciter. . . . 9

Direct-Reading Meter for Measuring Audio Frequency. . . . 17

Video I.F. Amplifier Design, by the Engineering Dept., Aerovox Corp. .. . . 22

"Ham" Activities. . . . 25

Short Wave Review. . . . 29

Classified Advertisements. . . . 32

Our Front Cover
Loudspeaker Response curves are rapidly and accurately plotted with the aid of this curve tracing equipment used in the Rola Company laboratory. The speaker under test is mounted on a baffle and placed in the sound pressure room. A signal of progressively varying frequency is fed into the test loudspeaker from the Beat Frequency Oscillator and power amplifier shown in the upper portion of the picture. Sound from the loudspeaker is picked up by a calibrated microphone in the sound pressure room and fed via another amplifier to the recorder unit which is mechanically linked with the B.F.O.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Correspondence: All correspondence, contributions, and enquiries referring to advertising space and rates should be addressed to our Registered Australian Office:

The Editor, "Radio and Electronics", 17 Bond Street, Sydney, N.S.W., Telephones: BU3879, BW7746, Telegrams and Cables: "Cranlay", Sydney

Managing Editor: LAY. W. CRANCH, AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Wholly set up and printed in Australia by R. V. Byers, 9 Wetherill St., North Lidcombe. 'Phone: UX6681 (Footnote P.1)

P.02 - Editorial
Editorial

AUSTRALIA DAY — January 26th, 1951 — officially ushered in the Jubilee of the Commonwealth of Australia, which was celebrated throughout the Continent by processions and pageants depicting the various changes that have taken place in our civil and commercial life during the period 1901 to 1951. Amongst these marched the science of Radio and Electronics and today we have our Radio and Electrical Industry as one of the three largest secondary industries in the Commonwealth, producing hundreds of thousands of pounds worth of essential equipment for our modern way of life, and employing directly and indirectly thousands and thousands of skilled and semi-skilled workers. We have viewed many and varied changes from the old spark transmitter and crystal set days to modern Radio as we know it, which has given mankind the marvels of Radar, untold numbers of electronic devices and last, but by no means least, TELEVISION. Home recording on disc, wire, tape, etc., is also practised by many enthusiasts, and really excellent recordings can be made by the average person (without any technical knowledge whatsoever) due to the high standard reached by commercial manufacturers of these units. Most of the old hands in the game, started their careers in the crystal set era, and your Editor can still recall his first variable condenser — which consisted of one aluminium "billy can" covered with waxed brown paper, sliding inside another one of slightly larger diameter. Compare that crude device with the modern gang condenser of today. . . such is progress! Television is with us to stay, in both black and white, and colour, and although it may be some time before T.V. is actually transmitted in Australia, we feel, it our duty to assist those interested, by providing them with such practical data that will enable the enthusiast to understand "what it is all about." Even in America, there are not enough skilled T.V. engineers or servicemen, so that it behoves us to assist in the training to provide skilled television personnel for the Industry — hence, our decision to proceed with the R. & E. Television Project. One thing we must also face is the effect of disruptions to our Industry through strikes, blackouts, shortages of materials, go-slow methods, etc. It is indeed heart-breaking to see one's plans knocked from pillar to post, through reasons beyond individual control, when we have the skill, equipment and enterprise, unsurpassed by anyone in the world, and an increasing population to absorb our products at reasonable cost. Therefore, let "the powers that be" take another good look at the ridiculous 25% Sales Tax applied to Radio, which has been classified as a luxury. Radio is NOT a luxury by today's standards, but is a necessity to our every day life, as through its medium, our physical, moral, mental and cultural well being is fostered. If it was good enough during war time to exempt certain trained service personnel to keep domestic receivers and the like working and allow the production of domestic receivers and parts, surely it is just as desirable in peace time to produce the requirements of the nation at a price commensurate with the living standards of the day. Less industrial strife, plus greater production is the answer which would provide more revenue at the normal tax rate, through greater volume of sales, but apparently, this is beyond those responsible, and the easiest way out is to "slam on extra tax," and place our industry in the luxury category, which is altogether ridiculous. If by virtue of the high Sales Tax, sales of radio receivers and parts to the public are made prohibitive purchases, it does not need much reasoning to see that certain manufacturers will close down, and skilled personnel will then drift into other industries. Should this be so, what would be the position if we had to urgently gear up the radio industry for defence purposes? Sales o f component parts to "Hams," Home Constructors, Servicemen, etc., cannot be classed a luxury either, as building radio and electronic equipment at home, must provide technical training to the party concerned, which could be used to advantage in times of need. This was proved by the Signals Personnel of the Armed Forces, the majority of whom were recruited from the wide circle of "Hams," Radio Servicemen and enthusiasts during the last war. This journal adds its voice to the official body representing the Radio Industry, and would like to record our disapproval of the Ministers' action, and commend a realistic attitude by reverting to the normal Sales Tax, and removing the classification of radio as a non-essential luxury. Our reason is, that we, amongst many others, consider RADIO TO BE A PUBLIC NECESSITY.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 03

Front Cover
Australian Radio & Electronics

incorporating

Australasian Radio World

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

MARCH, 1951 - Vol. 15, No. 8

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

AUSTRALASIAN RADIO WORLD

Vol. 15 - MARCH, 1951 - No. 8

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

R. & E. Gramophone Pre-Amplifier. . . . 4

N.B.F.M. Adaptor. . . . 9

A Regulated Power Supply (by the Eng. Dept. Aerovox Corp.). . . . 15

Novice Set-Building — A Section for the Beginner. . . . 16

R. & E. Television Project for Home Construction (Part 3). . . . 18

A Direct Reading Audio Frequency Meter (Part 2). . . . 22

"Ham" Activities. . . . 25

Short Wave Review. . . . 29

Classified Advertisements. . . . 32

Our Front Cover
The quality of the electrical steel used for Rola output transformers is checked with the aid of this Magnetic Comparator. The sample of standard steel and the test piece are placed in the central hole of the two balanced inductors shown at the top of the equipment which is then adjusted so that the pattern shown on the oscilloscope may be correctly interpreted.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Correspondence: All correspondence, contributions, and enquiries referring to advertising space and rates should be addressed to our Registered Australian Office:

The Editor, "Radio and Electronics", 17 Bond Street, Sydney, N.S.W., Telephones: BU3879, BW7746, Telegrams and Cables: "Cranlay", Sydney

Managing Editor: LAY. W. CRANCH, AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Wholly set up and printed in Australia by R. V. Byers, 9 Wetherill St., North Lidcombe. 'Phone: UX6681 (Footnote P.1)

P.02 - Editorial
Editorial

Electronics is a powerful, but comparatively new, tool, which is finding ever-increasing applications in industry, and it is to be hoped that it will continue to do so. There is, however, one particularly important feature of electronic equipment that may retard, rather than increase its usefulness, unless the designers of electronic devices give it more than passing thought. We refer to the question of reliability. Competent engineers realize that in a sense, electronics has grown up too quickly, and in some degree has even over-reached itself a little. The very fact that many things are more easily done electronically than by other means, together with the ability of electronics to do many more things that can not be done at all otherwise, has tended to make some workers think that electronics is a panacea or a kind of philosophers' stone. For just as many jobs can be done only by electronics, so too, many more hold no possible application for it. But it is not in either of these categories that the danger lies. It is in a third class of problems, which can be solved either by electronics, or by purely electrical or mechanical means, that electronic designers and engineers must exercise caution. These problems must be examined very carefully, as to cost, reliability, and ease of maintenance, before a decision is made for or against the electronic method. In many cases, first cost can actually be lower when the electronic solution is chosen, but cost may be quite unimportant compared with reliability. There are very few engineering projects where reliability is not of paramount importance, and it is here that responsible engineers have to think twice about the use of valve-operated equipment. It is an unfortunate thing, but a true one, that many of the fundamental processes upon which electron tubes rely for their manufacture or operation are still not properly understood. For instance, the exact mechanism by which electrons are made available by a cathode is still a matter for argument among physicists. Now this may not at first sight appear to have much to do with the reliability of vacuum tubes, but it has. For the most part our valves rely for their supply of electrons on composite cathode materials which are difficult to make, are very easily "poisoned" by minute amounts of impurities, and which even depend for their success on minute traces of other "impurities" whose role is not properly understood. Present-day valves are thus rendered more difficult to apply, because the cathode materials in use are sensitive, among other things, to the exact temperature at which they are run. In equipment which must be as reliable as possible, therefore, it becomes necessary to use controlling devices which regulate the voltage fed to the valve heaters, in order to maintain them at the right temperature. There is always the temptation to do without voltage control, cheapening the product and possibly reducing its reliability below the level that is really required. Who knows but that a fuller fundamental understanding of electron emission may not lead to the development of cathodes whose heating is so uncritical as to make voltage control unnecessary, even for the best equipment? This is merely one example of how increased knowledge could make electronic gear more dependable. But we have to work with the valves that exist, not with the improved ones the makers, of such things hope to develop. What, then, can we do to see that dependability is improved? An analysis of failure in the field has shown that there are three major causes of unserviceability in valve-operated equipment. They are (1) the use of valves when some other device would, have been more suitable; (2) the failure to select the best valve for the particular application; and (3) actual errors in design of the equipment, and the inadequate provision of protective devices which could prevent a breakdown of the complete equipment. It can be seen, therefore, that the design engineer can do a great deal to improve reliability. In the first place, he must ask himself whether a valve is needed, and if so, why? If the answer to this question is in the affirmative, he must investigate the possibilities should the valve fail. In many cases, failure can cause no more than inconvenience, as when the radio set goes out of action in the middle of an exciting serial, but in others, a valve failure may mean loss of property or even life. Where failures of this sort could occur, it is the designer's responsibility to make any failures "safe." In some equipment this means completed duplication with provision for automatically bringing in the standby gear when a failure occurs, while in others, a simple alarm indicator will suffice. It has been said that the greatest single threat to reliability is the continual pressure on the makers of tubes, by the users, to increase tubes' ratings. The opposite question — that of increasing the life expectancy of valves by working them under their ratings — is hardly ever raised, but by so doing, designers could undoubtedly save a multitude of tube failures which occur at less than the normal life expectancy of the valve concerned. These, and many other factors all contribute to the unreliability of things electronic, but no discussion of the problem would be complete that does not mention the question of maintenance. Here, education is necessary, not only for the designer, in the way he should go, but for the user, who should know how frequently routine inspections should be carried out, especially in the case of equipment on whose operation life and property depend. Lastly, there is education for those; whose direct responsibility the maintenance will be. The equipment itself, or its designer, cannot be blamed for failure which is due to improper maintenance but it is none the less in the interests of the producer of electronic goods to see that the users of his products have a proper appreciation of the maintenance that is required.


text:
English-Hanzi/When a venous thrombus enters the lungs

When a venous thrombus enters the lungs, it can cause complications, such as pneumonia.

当静脉血栓进入肺部时，会引起并发症，例如肺炎.


text:
User:Sfazo

Cross-kay

title: User:Sfazo


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 04

Front Cover
Australian Radio & Electronics

incorporating

Australasian Radio World

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

APRIL, 1951 - Vol. 15, No. 9

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

AUSTRALASIAN RADIO WORLD

Vol. 15 - APRIL, 1951 - No. 9

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

The Short Wave Miniature Three (Battery Operated). . . . 4

A Low-Powered P.A. Amplifier for Accumulator Operation. . . . 9

Vacuum Tube Methods of Measuring Insulation Resistance of Condensers (by the Eng. Dept., Aerovox Corporation). . . . 13

Novice Set-Building — A Section for the Beginner. . . . 16

R. & E. Television Project for Home Construction (Part 4). . . . 18

Some Waveforms and How to Make Them. . . . 21

"Ham" Activities. . . . 25

Short Wave Review. . . . 29

Classified Advertisements. . . . 27

Our Cover
Quality control of each individual unit is an essential factor in the production of Loud Speakers. Our Cover shows a reproducer from the production line being checked for frequency response on a Beat Frequency Oscillator and Amplifier in the Rola Test Laboratory. Each Rola speaker is subjected to this final oral test to check cone resonance, self resonance, sensitivity, plus its ability to fully reproduce the audio frequency spectrum.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Correspondence: All correspondence, contributions, and enquiries referring to advertising space and rates should be addressed to our Registered Australian Office:

The Editor, "Radio and Electronics", 17 Bond Street, Sydney, N.S.W., Telephones: BU3879, BW7746, Telegrams and Cables: "Cranlay", Sydney

Managing Editor: '''LAY. W. CRANCH''', AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Wholly set up and printed in Australia by R. V. Byers, 9 Wetherill St., North Lidcombe. 'Phone: UX6681 (Footnote P.1)

P.02 - Editorial
The Importance of Television

In a recent press interview, Mr. C. O. Stanley, chairman of directors of a large British television manufacturing firm, had some very interesting remarks to make on some of the aspects of television that seem to have escaped consideration here. At the moment, the Government is no doubt deliberating whether, in view of the international situation, it would be wise to expend money and effort in establishing a television service. Except for the fact that the Minister of Broadcasting has expressed himself as being very much in favour of the early introduction of television, other things being equal, nothing is known of the Government's intentions, but it is only natural to assume that the recent rapid deterioration in world relations must have had an effect on whatever views the Government may hold. The question will now be one, not of estimating the desirability or otherwise of our taking a practical interest in the newest and most potent means of home entertainment and education, but of considering whether every effort of which we are capable will not soon be needed for more urgent purposes. In this connection, some of Mr. Stanley’s remarks are worth more than passing consideration by the powers that be. It has been estimated, said Mr. Stanley, that a third world war would require electronic equipment to be manufactured and used on a scale fourteen times greater than during the last war. He did not say by whom this estimate was made, but it is not unreasonable to suppose that a man in Mr. Stanley’s position should be close enough to official quarters for such a statement to have been made with "inside" knowledge. Those of us who had some opportunity to observe the vast use to which electronic equipment was put during the last war will realise just what this statement signifies. Surely even the combined capacity of Britain and America will be hard put to it to produce equipment on such a colossal scale, and if this is so, then not even the relatively smaller manufacturing capacity of Australia and New Zealand will be of negligible importance, In both countries, however, the radio industry is, in the main, concerned with the production of domestic radio receivers, and there is a vast difference between the knowledge and technique required for this job and that needed for making highly specialised war equipment. Considered in this light, television assumes a new importance. It is a fact that only the possession of a flourishing television industry enabled Britain, during the last war, to put radar out of the laboratories and into the field, with a speed great enough to be of practical assistance, first to the defence of the country, and later to the highly successful offensive operations that were made possible only by electronic means. It may not at first be apparent just why the television industry was such a telling factor. There were two main reasons. The techniques which distinguish television engineering from "ordinary" radio work are exactly those which similarly differentiate radar and most other of the war-time electronic developments. Thus, a large section of the British radio industry was able, through its knowledge of television practice, to turn this to immediate practical account in switching over to radar manufacturing. It was even possible, by a lucky chance (aided by some thoughtful planning) to make direct use of a large amount of equipment that had actually been designed for TV receivers, thereby short-circuiting a great deal of development time on one particularly important project. We do not suggest that the same thing can happen again, but there is no doubt that the second great advantage of having had television actually operating before the war was to be found in the relatively large number of men who, knowing something of TV, were able to be converted into radar engineers and technicians in a very short time. It is a noteworthy fact that many of the most notable television engineers in Britain at the time became equally famous among those in the know for their work in developing radar and other electronic projects from the stage of laboratory curiosities to being major war-winning factors. If ever Britain had a successful "secret weapon," it was her supremacy at the time in the knowledge and application of electronics. And it was this same supremacy which enabled the unparalleled manufacturing capacity of the United States to play the part it did in winning the war. These statements, which we and many others, too, hold to be incontrovertible facts, show just how great a premium we should at this moment place on electronics. Here in Australia the radio industry rose to the occasion and played a very important part, albeit a small one in producing radio equipment not only for our own forces, but for British and American ones as well. At the moment, however, we are hardly "in the swim" as far as practical knowledge of the latest electronic weapons is concerned. N or do we have the facilities for making great contributions towards the development of new devices, but when, and if it comes to the point, we shall again be able to make a worthwhile contribution to the overall electronic war effort. The point we wish to make here is that our usefulness will be in direct proportion to the experience we shall have gained in modern electronic technique by the time we are called upon to assist, and that by embarking on a television programme we can do a great deal, in a strictly peaceful manner, to fit ourselves for what may be the greatest emergency ever. This point, we believe, should be given the most serious consideration by the Government when they are weighing up the pros and cons of TV in this country.


text:
English-Hanzi/When forming blood clots in deep veins, three factors are important

When forming blood clots in deep veins, three factors are important: blood flow velocity, blood concentration, and blood vessel wall quality.

在深静脉中形成血凝块时，三个因素很重要：血流速度，血液浓度和血管壁质量.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 05

Front Cover
Australian Radio and Electronics

incorporating

Australasian Radio World

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

MAY, 1951 - Vol. 15, No. 10

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

AUSTRALASIAN RADIO WORLD

Vol. 15 - MAY, 1951 - No. 10

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

An Easily Constructed Instrument for Measuring R.F. Resistance & Other Important Quantities. . . . 4

Audio Frequency Distortion Measurements. Part I. (By Eng. Dept. Aerovox Corp.). . . . 7

Some Waveforms & How To Make Them (Part 2). . . . 12

Novice Set Building (A Section for the Beginner). . . . 16

Circuit Symbols and What They Mean. . . . 18

Shoes and Ships (Useful Hints & Tips). . . . 22

"Ham" Activities. . . . 23

Short Wave Review. . . . 27

Our Cover
OUR COVER

Development of modern permanent magnet alloys such as the Anisotropic Alnico made by Rola Company (Aust.) Pty. Ltd. for use in their loudspeakers is one of the most important contributions made in the electrical and telecommunications fields in the past decade. And this research into improved magnet alloys and the abstruse problems of their heat treatment is still going steadily on. Our Cover picture shows one of Rola Company's team of physicists checking up the results obtained from a new batch of experimental magnets.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

BLACKOUT BLUES!! Owing to the DRASTIC newsprint and paper shortage, plus prevailing power blackouts, we have found great difficulty in maintaining the desired high presentation and appearance standard of our monthly journal. However, we feel our readers and advertisers will understand and appreciate the difficulties of obtaining suitable paper and bear with us as and when occasion demands. Irrespective of what class of paper we are forced to use from time to time, our Technical standard will not suffer, and we wish to assure all patrons and followers that everything is being done that is humanly possible to produce regularly, IRRESPECTIVE OF ALL OBSTACLES, Australia’s only publication entirely devoted to Technical Radio.

Managing Editor: '''LAY. W. CRANCH''', AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Wholly set up and printed in Australia by R. V. Byers, 9 Wetherill St., North Lidcombe. 'Phone: UX6681 (Footnote P.1)

P.02 - Editorial
EDITORIAL

In a recent issue of the British magazine "Wireless World," is a short paragraph which draws attention to the late Lord Derby, and the fact that as Postmaster-General, in the year 1904, he was responsible for setting a precedent for which amateur transmitters throughout the Empire should be eternally grateful. The occasion was the passing by the House of Commons of the first Wireless Telegraphy Bill, and the noble lord's words during his second reading speech are worth quoting: "The class with whom I have the greatest sympathy," he said, "are those who wish to go in for experiments in this science, and I have been able to frame a clause which will give absolute freedom in that direction, merely requiring registration on the part of those who wish to engage in experiments. In a matter of this description the House will doubtless desire that the Act should be administered as liberally as possible, and I shall certainly do my best in that direction. For what it is worth I will give an undertaking that no request for a licence for experiments be refused unless the refusal has been approved by me personally." These words might well be termed the Magna Carter (sic) of the amateur transmitter. Needless to say, the original delightfully simple state of affairs has not been retained, but it is important to note that the principal has not changed at all. The additional restrictions that have been placed on amateur activities have perhaps been regrettable, and no doubt call forth some nostalgic sighs from many "Hams" whose memories are not even as long as 1904, but the fact remains that they have been essential, in a world where radio communication has become such a vital service that every available kilocycle of the spectrum is needed. We are prone in these times to bemoan every additional restriction in an ever more regimented world, but the fact remains that with the frequency requirements of the nations so vast, amateurs are lucky to have any space left to them at all. Let it not be inferred that this journal does not believe that amateurs are worthy of every consideration. In the past, amateurs have rendered very great service to the nation, both in peace and in war, and it would be a very unjust thing if amateur activity were to be prevented because of restrictive legislation. On the other hand, amateurs should not forget that they possess their present frequency bands by way of privilege, and not as of right, and that given the appropriate conditions, they can be put off the air by legislation, as surely as they occupy their present position by virtue of other legislation. In time of war, amateur radio has to be suspended for a number of reasons, and it should be the constant concern of organised amateurs to see that their members themselves give no cause for peace-time restriction of their privileges. There is a large body of amateurs whose interest in transmitting is not technical, but centres rather round the making of conversation with other amateurs, and forming "over the air" friendships. No one would say that those who go in for this sort of amateur activity should be discouraged. Indeed such a recommendation would be highly undemocratic. But some of these "talkers," as we may call them for want of a better term, are anything but an ornament to amateur radio. Their conversation and operating practice is on the air for all to hear, and many non-amateurs with all-wave domestic sets do listen to the amateur bands. It follows, therefore, that the "talkers" are those among the "Ham" fraternity whose activity comes most before the public view, if only for the reason that they spend more time on the air than many whose interests are elsewhere. Unfortunately, however, some of the worst operating practice comes from among their ranks, and some of it sounds fairly dreadful even to other amateurs, let alone to the general public. Again, the "talkers" are prone to long spells at the microphone, very often with quality of transmission that leaves a good deal to be desired. This sort of thing does not make them popular with other amateurs, particularly when the bands are so crowded, and it is quite understandable when in consequence, they are taken to task in the amateur literature for their lack of consideration for other users of the bands. Even a casual search round the 80-metre band these days gives one cause to reflect that amateur radio is not what it was. At one time the people who came on the air and talked about anything but radio were fairly few and far between, because the main bond between amateurs was their common technical interest. Much of the technical talk that used to be heard was ill-informed, but almost all of it was characterised by an obvious desire to learn, and those amateurs whose technical knowledge was rather greater than the average were keenly sought after by the less knowledgeable. This sort of thing seems to us to be much nearer to the kind of amateur whom Lord Derby had in mind when he framed his 1904 legislation. He could not have foreseen the "talkers," aforesaid, and the point we wish to make here is that he might have been horrified if he had been able to! The moral of all this is that those responsible for controlling amateur radio by the granting of licences, and the administration and framing of amateur regulation do not have to foresee any thing of the kind, because it is therefor the hearing, and if a sufficiently large number of people among those in authority should decide that any section of radio amateurs is sufficiently little of an ornament not to be considered useful, it is not a long step to the restriction of amateur radio privileges, and not necessarily in a way that can be ascribed to the exigencies of ether space.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 06-07

Front Cover
Australian Radio and Electronics

incorporating

Australasian Radio World

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

JUNE-JULY, 1951 - Vol. 15, No. 11

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

AUSTRALASIAN RADIO WORLD

Vol. 15 - JUNE-JULY, 1951 - No. 11

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

The Tape Recording Head. . . . 4

In Tune with the Trade. . . . 7

R. & E. Gramophone Pre-Amplifier - (Part 2). . . . 8

Audio Frequency Distortion Measurements (Part 2). . . . 12

Novice Set Building (A Section for the Beginner) (Part 4). . . . 16

The S/W Miniature Three (Part 2). . . . 19

An Easily Constructed Instrument for Measuring R.F. Resistance and Other Important Quantities (Part 2). . . . 20

R. & E. Television Project for Home Construction (Part 5). . . . 21

"Ham" Activities. . . . 25

Short Wave Review. . . . 29

Classified Advertisements. . . . 32

Our Cover
OUR COVER

Mounting and inspecting Radiotron Valve Assemblies at the works of Amalgamated Wireless Valve Company, Ashfield, N.S.W.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Managing Editor: '''LAY. W. CRANCH''', AMIRE (Aust.), M.W.I.A., VK2XC

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Wholly set up and printed in Australia by R. V. Byers, 9 Wetherill St., North Lidcombe. 'Phone: UX6681 (Footnote P.1)

P.02 - Editorial
EDITORIAL

The expansion of a relatively new field of endeavour, such as electronics undoubtedly is, depends largely in a given place, on the number of skilled engineers and technicians that are available. The Australian radio industry, even at the present time, is short of such personnel, and possible future events can only increase the shortage, unless something is done about it. Not only is it possible that in a very few years the manufacture and maintenance of television receivers will be added to the industry's present endeavours, but the normal development of radio services generally, and the expanding use of electronic equipment in a wide variety of industries, will create a need for more men whose knowledge and attainments will have to be high, by present-day standards, if their functions are to be satisfactorily carried out. One of the greatest difficulties in attempting to entice more young men into the industry is that there is no professional standing attaching to most technical jobs within the industry. What other avenues of approach are available? If the boy is of greater than average ability, and is well advised, he may go to university, take a science degree in radio-physics, or one in electrical engineering, and then, after years of expensive preparation, find that the only positions available which will make use of his attainments are those in Government departments. This may not worry the young man him self, because he is usually sufficient of an enthusiast to be glad of work that is interesting, and in his own particular line, but it should worry the radio industry! The radio industry should, for its own good, do something active to encourage university graduates of the right kind, and with the right qualifications, to join its staffs. It may think that it has no place for such men, and in some cases this may be true, because the positions that might be held by them are filled by men who have grown up with the industry almost from boyhood, and who hold their positive (sic, positions?) by virtue of long practical experience rather than by formal qualifications. These men are extremely valuable, and no one in his senses would suggest that they should not hold their positions because they do not hold degrees. But time has already marched on, and these old hands will before long have disappeared; from where are they to be replaced. They should be replaced, when the time comes by young men of the kind we have been discussing. Those responsible should not make the mistake of believing that because the "old hands" were so good without formal training, then formal training is not needed. It is the time factor that counts, as ever; for a young man, suitably trained before engagement, can, if he is a capable youth, be brought to the required standard more surely, and in a tenth of the time than can one who has no formal background.

THIS COMBINED ISSUE — or BLACKOUT BLUES — (Part 2)

In our May issue we wrote a leader on newsprint shortage, etc., and had hopes that our supplies of paper already "on the water" would arrive in time to prevent further worry in this direction. Well, it did arrive in Sydney Harbour quite satisfactorily — but it's still on the water, as due to measures beyond our control, the ship containing same has not been unloaded to date. Wouldn't it? This, of course, has thrown a large spanner into our works, with the result we have been forced to publish our June and July issues together, otherwise we would have been 30 days behind delivery date with Australian Radio & Electronics. We, therefore, have taken this drastic step of catching up a month's lag, but can assure all concerned that there will be no loss of continuity in articles, advertisements or subscriptions, as the latter expiry date will be extended to cover an extra issue. Many of our readers have complained that they are not receiving A.R. & E. until the month following publication date, and this has also been a prime factor in combining this issue, as it gives us the opportunity of getting a bit of time "up our sleeves" so that we can endeavour to overcome the many problems of publishing today. Considerable reorganisation has been necessary and we intend producing a bumper August issue, to compensate for this combined one, which will start our new volume, and A.R. & E. should, according to plans, make its appearance in the first week of the month in future. The trials and tribulations of today are enough to send a man bald-headed (as a matter of fact, your Editor is already growing a nice head full of skin), but as some wise gentleman once wrote, "It's better to be optimistic than have a misty-optic" — so here's hoping.


text:
History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1951 08

Front Cover
Australian Radio and Electronics

incorporating

Australasian Radio World

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

AUGUST, 1951 - Vol. 16, No. 1

1/6

P.01 - Contents Banner
AUSTRALIAN RADIO AND ELECTRONICS

and incorporating

(AUSTRALASIAN RADIO WORLD)

Providing National Coverage for the Advancement of Radio and Electronic Knowledge.

Vol. 16 - AUGUST, 1951 - No. 1

P.01 - Contents
CONTENTS

Our Cover. . . . 1

Editorial. . . . 2

A Simple and Inexpensive Vacuum Tube Voltmeter (Part 1). . . . 4

In Tune with the Trade. . . . 11

The Beginners Quality Amplifier. . . . 12

Novice Set Building (A Section for the Beginner), Part 5. . . . 16

International Broadcasting and Shortwave Review (A Special Section for Old and New Australians). . . . 21

Amateur Radio Section — Input Impedance of Folded Dipoles. . . . 30

"Ham" Activities and Disposals Equipment. . . . 33

Classified Advertisements. . . . 36

Our Cover
OUR COVER

The design of suitable transformers to couple the relatively high output impedence of the audio power amplifier to the low impedence of the loudspeaker voice coil is a rather complicated job. Our Cover picture shows a corner of the Rola laboratory in which an audio oscillator, a bridge network and a vacuum tube voltmeter has been set up to make impedance measurements on a Rola C type transformer. Incidentally, each Rola output transformer has been specially designed to operate with a given valve or valves under a specified set of plate and screen voltage conditions.

P.01 - Publication Notes
Subscription Rates: 12 Issues 18/- Post Free

Published by the Proprietors: Radio & Electronics (N.Z.) Ltd. (Publishers - Incorporated in N.Z.) 17 Bond Street, Sydney, N.S.W.

Managing Editor: '''LAY. W. CRANCH''', AMIRE (Aust.), M.W.I.A., VK2XC

'''When making purchases or enquiries please mention Aust. Radio & Electronics. IT HELPS US BOTH'''

Providing National Coverage for the Advancement of Radio and Electronic Knowledge

Sole Wholesale Distributors - Gordon & Gotch (A/asia) Ltd.

Printed by ACACIA PRESS, 171 Parramatta Road, Annandale (Footnote P.40)

P.02 - Editorial
EDITORIAL

This issue commences our Volume 16 No. 1 and readers will note that, whilst retaining our usual Technical features, we have further improved the scope of "AUSTRALIAN RADIO AND ELECTRONICS" by the extension of our Shortwave Review to cover International Broadcasting generally. Many of our readers are Shortwave listeners, who pursue the Hobby of logging stations from all over the world, thus improving their knowledge of other countries, quite apart from the entertainment derived therefrom. We have also received endless enquiries from New Australians requesting information as to when and where they can receive transmissions from the country of their birth. Research into their requirements has shown that it is not so much the stations of their former countries that they want to get, but to be able to listen to their MOTHER TONGUE, irrespective of what country or station transmits it. This is quite understandable when one realises that most of our new brethren are struggling hard to get a working knowledge of English and no doubt, in a year or two, will be able to converse in English and use the famous Australian adjectives in the right place, just like any dinkum Aussie does. However, we are of the opinion that all of us need relaxation when the day's work is done, and it is only natural that our New Australian friends should converse amongst themselves and want to listen to broadcasts in their own tongue. Imagine yourself for instance, transferred to Italy (or some other country) and trying to cope with a new language day and night. Would you not endeavour to locate, per medium of your radio, some English speaking session, irrespective of what country transmitted it? We are sure you would, and it is for this reason that we have commenced the International Broadcasting section of our journal. If we can assist our new countryman to settle down more quickly to our way of life, surely we should do so. Therefore, A.R. & E. (Australian Radio and Electronics) have set up a special listening post, under the direction of Mr. L. J. Keast, our Shortwave Editor, to fully monitor foreign shortwave broadcasts and these, for the convenience of our readers, are listed under their appropriate language headings, so that "Old" and "New" Australians will derive maximum benefit from our service.

THIS TELEVISION BUSINESS.

All the talk of recent months in radio circles has been largely centred about the possibility of television being introduced into Australia in the not-too-distant future. That the entertainment value of television will be great is obvious and its impact upon the people will be far greater than radio ever was, since it will command a person’s whole attention and become eventually a centre of family life. To those stout souls who are rearing a family in this troubled age and find it so difficult to get out in the evening for entertainment, this new art is going to come as a real boon. True, there are some pessimistic types who say it is not stimulating to thought and that it is the lazy man’s method of entertainment, since he just has to "sit, look, and listen". This line of reasoning, however, seems dangerously like inviting an argument, for surely entertainment should provide relaxation. Most radio men will agree that they get all the thought stimulation they require during the course of a normal business day without carrying it over into the evening! Anyway, if we are to believe medical science, modern man is in no danger of becoming a moron, rather the reverse in fact, since his capacity for thought is increasing with every generation, and with all these distractions abounding! Whichever way it goes, however, one thing is certain — while hundreds of people are obtaining considerable enjoyment from it the radio servicemen will be getting bags of thought stimulation while burning the midnight oil trying to fix Mrs. So-and-So’s set in time for the cooking demonstration next morning!


text:
User:Luana11/huggle.yaml.js

--- enable: true version: "3.4.10 build: 3880 3.4.10" report-summary: "Reporting $1" confirm-multiple: false confirm-talk: true confirm-self-revert: true confirm-whitelist: true revert-on-multiple-edits: true automatically-resolve-conflicts: true software-rollback: false enforce-months-as-headers: true history-load: true on-next: 1 delete-edits-after-revert: true skip-to-last-edit: false preferred-provider: 2 remove-oldest-queue-edits: false truncate-edits: false talkpage-freshness: 20 remove-after-trusted-edit: true retrieve-founder: false display-title: false check-tp: true manual-warning: false summary-mode: false automatic-reports: false han-html: false han-display-user-talk: true han-display-bots: false han-display-user: true watchlist: "preferences" automatically-group: false queue-id: "default" page-empty-queue: "" enable-max-score: false max-score: 0 enable-min-score: false min-score: 0 automatic-refresh: true automatically-watchlist-warned-users: false shortcut-hash: "" show-warning-if-not-on-last-revision: true number-dropdown-menu-items: true insert-edits-of-rolled-user-to-queue: true confirm-on-recent-warning: true recent-warning-time-span: 120 confirm-warning-on-very-old-edits: true skip-warning-on-confirm: true queues:
 * 1) // This is a configuration of huggle, do not change it unless you know what you are doing.
 * 1) // Last version of huggle that wrote into this configuration file (sanity check)
 * 1) // This option will change the behaviour of automatic resolution, be carefull
 * 1) // Get original creator of every page so that you can G7 instead of reverting the page
 * 1) // Periodically check if you received new messages and display a notification box if you get them
 * 1) // HAN
 * 1) // Whether edits made by same user should be grouped up together in page
 * 1) // Location of page (wiki page name, for example WP:Huggle) that should be displayed when you hit next and queue is empty. Leave empty for default page.
 * 1) // If true you will not warn users who received a warning recently
 * 1) // If warning was sent less than N seconds ago it's considered too recent
 * 1) // If true, the options above will not generate confirmation, but instead will be silently accepted (warning will not be sent)

title: User:Luana11/huggle.yaml.js