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GLOSSARY OF TERMS
1) AC Input - Alternating Current power source available
12) HF - High Frequency band extends from
at wall outlet sockets. approximately 1.5 MHz to 30 MHz.
2) AM - Signals in which the information is conveyed by 13) LCD - Liquid-Crystal Display - Low power consump
amplitude changes of the signal. Amplitude Modulation tion displays used for wristwatches and information
is used for the AM broadcast bands. displays on many types of electronic equipment.
3) AGC - Automatic Gain Control which is employed in 14) LSB - Lower Side Band - The lower frequency
receivers to adjust the amount of gain in the receiver's portion, excluding the carrier, of an AM signal. A
circuitry to prevent distortion and maintain a nearly single-sideband signal, in this case the lower sideband,
constant audio volume level over wide variations in contains all of the modulation information of amplitude
received signal strength. modulation in one half the bandwidth.
4) Attenuation - Loss, as applied in the text of this 15) RF - Radio frequency.
manual, added prior to the input stages of the receiver to
reduce the level of very strong signals that may occur on
16) RTTY - Radio Teletype communications.
certain bands, in certain locations, at certain times or a
combination of all three factors. Each 10 dB (decibel)
17) Squelch - A user controlled adjustment which mutes
step reduces the power of the received signal by a factor the audio output below a certain signal strength.
of ten.
5) CW - Continuous Wave transmission signals. Actually,
18) Synchronous Detector - An amplitude modulation
detector which utilizes a replica of the original transmit
the signal is keyed on and off at precise intervals to ted carrier signal to improve the reception of weak
convey information. Morse code is the most common signals.
CW signal.
6) DC Input - Direct Current power source such as is
19) Synthesized - Capable of generating a large
number of different output frequencies, all related to a
available from batteries or regulated power supplies. single, highly stable reference source.
7) Dynamic Range - Ability of the receiver to faithfully 20) Up Conversion - A frequency conversion technique
reproduce high quality audio over a wide range of signal that translates an incoming RF signal to a higher fre
strength conditions - from very weak signals to very quency.
strong signals.
8) Frequency - Rate of reoccurrence in hertz or cycles
21) USB - Upper Side Band - The higher frequency
portion, excluding the carrier of an AM signal. A single
per second of an electromagnetic wave or carrier. sideband signal, in this case the upper sideband,
9) FM - Signals in which the information is conveyed by
contains all of the modulation information of amplitude
modulation in one half the bandwidth.
frequency changes of the signal. Frequency Modulation
is used for the FM broadcast bands.
22) UTC - Universal Time Coordinated.
10) Electronically Switched Filter - A multi-bandwidth
23) VFO - Variable Frequency Oscillator.
filter with high adjacent channel attenuation switched
electronically.
24) VHF - Very High Frequency band extends from
11) GMT - Greenwich Mean Time.
approximately 30 MHz to 300 MHz.