Garmin GNC 250XL Operating Handbook page 6

Section 9 Cirrus Design
Supplements SR20
Communication (COM) Transceiver
The GNC 250XL includes a digitally-tuned integrated VHF
communications (COM) transceiver. The transceiver and integrated
controls are mounted in the Garmin GNC 250XL unit and are
designated COM2. The transceiver receives all narrow- and wide-
band VHF communication transmissions transmitted within a
frequency range of 118.000 MHz to 136.975 MHz in 25.0 kHz steps
(720 channels). The tuning controls are collocated with the NAV at the
right side of the GNC 250XL front panel. Frequency tuning is
accomplished by rotating the large and small concentric knobs to
select a standby frequency and then transferring the frequency to the
active window. The active frequency is always displayed at the upper
left corner of the GNC 250XL display. The standby frequency is
displayed below the active frequency in the map mode and to the right
of the active frequency in all other modes. Auto-tuning can be
accomplished by entering a frequency from a menu. The COM 2
antenna is located below the cabin on the airplane centerline. 28 VDC
for transceiver operating is controlled through the Avionics Master
Switch and supplied through the 7.5-amp COM2 circuit breaker on the
Avionics Non-Essential Bus.
6 of 6 P/N 11934-S05
Original: 3-31-99