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1 - COM
190-00357-00 Rev E
Emergency Channel / Stuck Mic
Emergency Channel
The GNS 530W’s emergency channel select pro-
vides a quick method of selecting 121.500 MHz as the
active frequency in the event of an in-flight emergency.
The emergency channel select is available whenever
the unit is on, regardless of GPS or cursor status, or
loss of the display.
Press and hold the COM flip-flop key for
two seconds to activate the 121.500 MHz
emergency frequency.
To quickly tune and activate 121.500, press
and hold the COM (or remote) flip-flop key for
approximately two seconds. If the remote key is
used, further changes in COM frequency will not
be possible without recycling power.
NOTE: Under some circumstances if the com system
loses communication with the main system, the radio
will automatically tune to 121.500 MHz for transmit
and receive regardless of the displayed frequency.
Stuck Microphone
Whenever the GNS 530W is transmitting, a
“TX”indicationappearsintheCOMwindow.Ifthe
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 35 seconds of continuous
broadcasting. You will also receive a “COM push-to-
talk key stuck” message as long as the stuck condition
exists.
A “COM push-to-talk key stuck” message appears to warn
you of a stuck microphone. Transmitting is disabled after 35
seconds of continuous broadcasting.
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 fre-
quency box and display a temporary pop-up window
withthecurrentPresetIDnumber—e.g.,Preset1or
Preset 12. 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. See Aux Pages - Setup 1 Page Preset Com Frequen-
cies for instructions on storing preset Com frequencies.
GNS 530W only
* Preset Com
Frequencies are
only available
with Main
System Software
Version 3.00, or
later.