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To auto-tune a frequency from a list displayed in the GPS window:
1. Press
C
twice to activate the cursor in the GPS window.
2. Rotate
O
to highlight the desired frequency.
3. Press
E
to make the selected frequency the standby frequency.
Another useful feature integrating the GNC 250XL’s navigation and communication
capabilities is the Navigation Communications (NAVCOM) page, which is accessed
using the
N
key. See pages 16-17 for more on the NAVCOM page.
The GNC 250XL’s automatic squelch and volume controls are located at the
bottom left of the unit, near the NavData card slot.
To adjust the radio volume:
1. Rotate the
B
knob.
Whenever the GNC 250XL is powered up, the automatic squelch will be in the
‘on’ position, allowing only transmissions which are powerful enough for clear broad-
cast to be received. Manual squelch control is not available.
To override the automatic squelch control:
1. Press the
Q
key. Press
Q
again to return to automatic squelch.
Whenever the GNC 250XL is transmitting, a ‘tx’ icon will appear between the
active and standby frequency fields. If the microphone is stuck or accidentally left in
the keyed position, or if the headsets continue to transmit after the key is released, the
radio will automatically timeout after 35 seconds of continuous broadcasting. You’ll
also receive a ‘Stuck mic/Tx disabled’ message as long as the stuck condition exists.
35
‘TX’ indicating radio transmission.
SECTION
2
COMM FEATURES
Auto-Tuning
Volume & Squelch
250xl manual 2 7/17/98 1:27 PM Page 35