General Dynamics C4 Systems URC-200 (V2)
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Aviation mode
To place the transceiver in the Aviation Mode, start with
the transceiver powered off and then press and hold the 4
[AV] keypad while turning on the power. The unit remains
in the aviation mode through subsequent power cycles until
it is returned to the normal operating mode.
The transceiver sets all the channel data for each channel to
a default value (118 MHz, PT, AM, 25 kHz bandwidth, low
power). Existing channel data (presets) will not be retained.
To return to the normal operating mode, start with the
transceiver powered off and press and hold the 6 [MODE]
key while turning on power.
The transceiver will reset all the channel data (presets) for
each channel to the default values (225 MHz, PT, AM, 25
kHz bandwidth, low power).
4.7.3.2 Tuning and Channel Spacing in Aviation Mode
When in the Aviation Mode, the format in which the channel is entered determines the actual
operating frequency and the channel spacing. The ICAO standard mandates that specific channel
spacings (either 25 or 8.33 kHz) shall be assigned to specific channel entries. This also means the
channel that is entered and displayed may be different from the actual frequency the transceiver is
tuned to.
The Aviation Mode Frequency Chart (Table 18) shows an example of how to enter channels to
select the desired operating frequency and channel spacing. The table uses 118 MHz as an example;
however, any frequency from 117.9750 to 136.9750 kHz may be selected.
For example, if the desired actual operating frequency is 118.000 MHz with a channel spacing of
25 kHz, enter 118000 using the keypad or remote command. The result will be what is shown in
line 1 of the chart. If, however, the desired frequency is 118.000 MHz but with a channel spacing of
8.33kHz, enter 118005 and the result will be as shown in line 2 of the chart. Note that the
transceiver will display 118005 even though it is tuned to 118.000 MHz.
In some cases, only 8.33 kHz channel spacing is allowed. Examine lines 3 and 4 of the chart.
Because tuning increments of 8.33 kHz are allowed, the next possible operating frequency after
118.000 MHz is 118.0083 MHz. In this case only 8.33 kHz channel spacing is available for this
frequency. To tune this frequency, enter 118010 into the transceiver. The entered value is what will
be displayed even though the transceiver will be operating at 118.0083 MHz.
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