NEAR SYNCHRONOUS ORBITAn orbit in which the satellite rotates close to but not exactly at the
same speed as the earth.
NEUTRALThe teletypewriter operation where current flow represents a mark and no flow represents a
NOISE SILENCER, NOISE SUPPRESSOR, OR NOISE LIMITERCircuits that clip the peaks of
the noise spikes in a receiver.
NONSYNCHRONOUSThe teletypewriter operation where both transmitter and receiver do not
ORDER-WIRE CIRCUITA circuit between operators used for operations control and coordination.
PAGE PRINTERA high-speed printer that prints teletypewriter characters one at a time in a full-page
PASSIVE SATELLITEA satellite that reflects radio signals back to earth.
PATCH PANELA panel used to tie a receiver or transmitter to its associated equipment.
PARTA part is one component or two or more components joined together. It is not normally subject
to disassembly without destruction.
PERFORATORA device that stores a teletypewriter message on a paper tape. It may be stored for
PERIGEEThe point in the orbit of a satellite closest to the earth.
PERMANENT MAGNET SPEAKERA speaker with a permanent magnet mounted on soft iron pole
POLARThe teletypewriter operation where current flow of one polarity represents a mark and current
of the opposite polarity represents a space.
POLAR ORBITAn orbit that has an angle of inclination of or near 90 degrees.
PROGRAMMED TRACKINGThe method that uses known satellite orbital parameters to generate
antenna pointing angles.
RADIO COMMUNICATIONSThe term describing teletypewriter, voice, telegraphic, and facsimile
RADIO FREQUENCY CARRIER SHIFTThe system that uses a keyer to shift a radio frequency
signal above or below an assigned frequency. These shifts correspond to marks and spaces.
RADIO SET CONTROL UNITEquipment used to remotely control certain transmitter and receiver
RECEIVEREquipment that converts electromagnetic energy into a visible or an audible form.
RECEIVER TRANSFER SWITCHBOARDEquipment used to transfer receiver audio outputs to
remote control station audio circuits.