User's Manual

FLEXCOMM II
C-5000 (P-25 Capable)
Operator’s Manual
Flexcomm I – First ge
neration 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.
FM – Acronym for “Frequency Modulation”. In this type of modulation, the frequency of the signal is varied
from its center point in proportion to the amplitude of the voice or data signal. Most importantly, this type
of modulation is not affected by lightning or other atmospheric noise.
Guard Receiver – Second receiver added to the transceiver to monitor a specific frequency. Some
common “guard” frequencies are 121.5, 243, Marine channel 16, and Marine channel 70. However, this
optional function can also be used to monitor a dispatch channel, or an important tactical frequency.
Some Guard receivers have a single frequency that is set in hardware Other options, available only in
the RT-5000, are a programmable dual channel receiver and a multi-band P25/Trunking compatible unit.
IF Injection – In a superhetrodyne receiver, high frequency signals are progressively lowered in
frequency until only the audio is left. This is done by multiplying the RF Signal by a sinewave either above
or below the RF carrier. Mathematically this results in an “Intermediate Frequency” (IF) that is the sum
and difference of the two signals The RT-5000 has the capability of having either High (Above) or Low
(Below) the signal frequency What this means is if you have a signal interfering with the desired signal.
Sometimes the interference can be eliminated by switching either the 2
nd
or 3
rd
injection setting.
Interoperability – The ability for different radio systems to communicate with each other directly. For
example, when one manufacturer’s radio products will communicate with another’s, they are said to be
“Interoperable”.
ITM – “Internal Transceiver Module”. This is the module that is physically placed in the Guard Receiver
slot in the RT-5000. This is the part of the radio that can perform P-25, encryption, and Motorola
Trunking. Each ITM covers a specific frequency band: 136-174, 380-470, 450-520, 764-870, and 806–
870 MHz. Up to two ITM’s can be put into one RT-5000 however one must be below 380 MHz and one
above 380 MHz.
KEYMAT – Another name for an encryption key.
KVL – Acronym for Key Variable Loader. It is a Motorola product for loading encryption keys into an
encryption capable radio.
Main Receiver – Full function receiver located in every transceiver.
Manual Channel – A special preset channel that allows the operator to manipulate channel information
without going into programming mode. On the C-5000 this special channel is labeled “..M” and is located
at channel 0.
MODE 1 – Operational mode of the C-5000/RT-5000 system where the operator does not know there is a
main and guard located in the transceiver. This simplifies the user interface dramatically. However, only
one receiver, the main or the ITM module in the Guard is in operation at one time so only one channel is
monitored.
MODE 2 – Operational mode of the C-5000/RT-5000 system where the main and guard receiver are both
monitoring frequencies at the same time. The user interface is more complex in that the user must select
using the silver “soft” buttons on the C-5000 which determine which channel to display and transmit on.
Publication
No. 150-041102 Page 10 of 88
Rev E C-5000 Operators Manual