General Dynamics C4 Systems URC-200 (V2)
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4.4 Normal Operating Mode Configuration Procedures
The transceiver can be used for operation once it has been installed. The transceiver is fully micro-
processor-controlled from push button instructions selected at the front panel. The frequency is
tuned either by selecting one of ten preset channels or by manually setting up the frequency on the
LCD display. The preset frequencies may be stored in memory and may be changed any time the
transceiver is turned on. The memory is maintained using an EEPROM that allows the presets to be
stored even when the power is turned off or the transceiver batteries are removed. The EEPROM
provides non-volatile memory and does not require the use of a keep-alive-voltage.
In normal operating mode, the display shows the channel currently in use. The receive frequency
and its associated data for that channel are displayed while the transceiver is in receive mode.
When the PTT is pressed, the transmit frequency and its associated data for that channel are
displayed. When transmitting, the transmit annunciator (TX) is on.
If the [R/T] key is pressed while in receive mode, the transmit frequency is displayed, but the
transceiver will still be receiving on the current channel's receive frequency. This situation is
indicated by a blinking transmit annunciator. Pressing PTT at this point will put the transceiver in
transmit mode, causing the transmit annunciator to come on steadily. When the PTT is released, the
transceiver will go back into receive mode with the receive frequency and data for this channel
being displayed.
4.4.1 Turning on the Unit
Before performing the following steps, refer to Paragraph 4.2 for the location and functional
description of the controls and indicators.
1. Make sure the transceiver set is connected for operation according to the installation
instructions in Paragraph 2.2.
2. Turn on the transceiver by turning the VOL control clockwise.
3. Set the VOL control for the desired volume (the SQ control must be in maximum counter
clockwise position). To hear audio from the loudspeaker the speaker must be enabled per
Paragraph 4.4.4.
4. Adjust the SQ control for the threshold by advancing clockwise slowly, just until the noise
stops. Advancing the control further will reduce the sensitivity of squelch break.
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