3-12
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Com/Nav
Stuck Microphone
Whenever the GTN 635 or 650 is transmitting, a “TX” indication appears
in the Com window. If the push-to-talk key on the microphone is stuck or
accidentally left in the keyed position, or continues to transmit after the key is
released, the Com transmitter automatically times out (or ceases to transmit)
after 30 seconds of continuous broadcasting. You will also receive a “Com push-
to-talk key stuck” message as long as the stuck condition exists.
Remote Frequency Selection Control
On units configured for remote Com frequency Recall, pressing the remote
recall switch will load the next preset Com frequency into the unit’s Standby
frequency box. The remote recall switch can be pressed multiple times to scroll
the entire preset frequency list through the Standby frequency box (the list will
“wrap” from the bottom of the list back up to the top, skipping any empty preset
positions).
The standby frequency isn’t activated until a Com flip-flop switch (either
remote- or bezel-mounted) is pressed. Remote Frequency Selection only functions
on units configured for a remote Com Frequency recall switch.
NOTE:
For software prior to v5.00, frequencies must be stored in the User
Frequency List prior to utilizing the remote channel select switch.
Reverse Frequency Look-Up
When the Reverse Frequency Look-Up feature is enabled in System-Setup,
the identifier and frequency type will be shown for the selected Com and Nav
frequencies for the nearest stations that are in the aviation database when the
unit is receiving a valid position input. Station Identifiers with a “+” sign will
have more stations associated with this frequency than just the type displayed.
The “+” Sign Indicates More
Stations Associated with this
Frequency
Identifier and Type Shown
for the Selected Frequency
Figure 3-25 Reverse Frequency Look-Up
NOTE:
It can take up to 2 minutes for the RFL frequency to change after
crossing the half way point when flying from one airport to another that
both use the same frequency.
Summary of Contents for GTN 625
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