C-5000 Pilot’s Guide
Publication No. 150-041103 Page 34 of 51
Rev. C C-5000 Pilot’s Guide
Nov 2013
Glossary
AM – Acronym for “Amplitude Modulation”. In this type of modulation, the amplitude of the signal is
varied in proportion to the voice or data input signal. The signal quality can be severely degraded
because of lightning or man made electrical noise. AM is only used in the frequency ranges 108 to
152 MHz and 225 to 400 MHz. All air traffic control functions use AM modulation.
Audio Phase – The RT-5000 can invert the phase of the audio signal during transmit or receive. This is
sometimes necessary for DPL systems to work.
Bandwidth – A term used to describe the amount of frequency a channel has to transmit a signal. Two
of the most common FM channel bandwidths are 12.5 kHz (Narrow) and 25 kHz (Standard). Some
special signals, such as military encryption, work best when using 35 kHz (Wide) or 70 kHz (Extra-
wide) channels. All of these bandwidths are available in the RT-5000.
Channel – A group of radio characteristics, such as receive & transmit frequencies, modulation, power
levels, etc.
CMC – An acronym for Communication Management Controller. The C-5000 is a CMC.
CTCSS – Acronym for “Continuous Coded Squelch System”.
DCS – Acronym for “Digital Coded Squelch”
DES – Acronym for “Digital Encryption Standard”. This is an algorithm by which signals are encrypted.
Deviation – The amount of peak change the RF signal varies from the carrier in proportion to the
amplitude of the voice signal.
DPL – Acronym for “Digital Private Line”. Also known as DCS.
DTMF – Dual Tone Multiple Frequency. On a telephone keypad, each row and column have unique
audio tones that are sent when a button is pushed. At the receiver, a decoder listens for a row tone
and a column tone and can determine from that, which button has been pushed.
Direct – Also known as simplex, car-to-car, and talk-around. This mode of operation allows you to
bypass the repeater and talk directly to another radio. Transmit and receive frequencies are the
same.
Encryption – Method by which a signal is “scrambled” so that other listeners cannot understand what is
being transmitted.
Encryption Key – When encrypting a transmission, the algorithm used to scramble the information
requires both the transmitting and receiving devices to have a number. This number is called an
Encryption Key. Some systems are limited to one key and others are capable of having multiple
keys.
Flexcomm I – First generation of Flexcomm control heads and transceivers. This includes the C-1000
control head and RT-30, RT-138(F), RT-450, RT-406F transceivers.
Flexcomm II – Second generation of Flexcomm control heads and transceivers. This includes the C-
5000 control head and RT-5000 multi-band transceiver.
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