3-13190-01007-03 Rev. D Garmin GTN 725/750 Pilot’s GuideForewordGettingStartedAudio &Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafflcTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex3.3.4 Stuck MicrophoneWhenever the GTN 750 is transmitting, a “TX” indication appears in the Comwindow. If the push-to-talk key on the microphone is stuck or accidentally leftin the keyed position, or continues to transmit after the key is released, the Comtransmitter automatically times out (or ceases to transmit) after 30 seconds ofcontinuous broadcasting. You will also receive a “Com push-to-talk key stuck”message as long as the stuck condition exists.3.3.5 Remote Frequency Selection ControlOn units configured for remote Com frequency Recall, pressing the remoterecall switch will load the next preset Com frequency into the unit’s Standbyfrequency box. The remote recall switch can be pressed multiple times to scrollthe 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 presetpositions).The standby frequency isn’t activated until a Com FLIP/FLOP switch (eitherbezel-mounted or remote (COM RMT XFR) is pressed. Remote Frequency Selectiononly functions on units configured for a remote Com Frequency recall switch.NOTE: Frequencies must be stored in the User Frequency List prior toutilizing the remote channel select switch.
