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Frequency Selection
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TM-11-5895-1195-10 Radio Sets AN/URC-100 (NSN
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Transmit Mode


Only these frequencies can be dialed into the frequency select rotary pushbuttons If a frequency is selected that is
outside the band. the radio will not transmit or receive The frequency set into the panel switches is applied to both the
transmitter and receiver circuits on the FREQ SELECTION line as shown in Figure 1-2 The unit has the capability of
loading up to eight frequencies into the radio's memory for routine use This allows the operator to select any one of the
eight frequencies by changing the position of the front panel function selection switch. Two of the eight frequencies are
guard frequencies which are monitored during the scan mode of operation described in paragraph 1-20. The frequency
being transmitted or received can be viewed on a display and the panel backlighting turned on to show that frequency on
a numerical display. The frequency display and panel lighting are normally off to conserve battery power
1-17. Receive Mode
The receive mode is enabled when power is applied to the radio and the handset push-to-talk switch is not pressed.
Because the switch is not pressed, the push-to-talk (PTT) line switches the unit so that incoming signals from the VHF or
UHF antenna pass through the UHF/VHF switch to the RCV SIGNAL line. They are then demodulated and converted by
the receiver circuits to form the RCV AUDIO signal. The receiver demodulates the incoming signals according to the
settings on the front panel frequency select switches. These settings are programmed into the receiver circuits through
1-18


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