Garmin 225B, 225A manual Pilot Controls, Power/Com Volume/Squelch Knob

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1.2Pilot Controls

The GTR 225 controls have been designed to simplify operation of the system and minimize workload and the time required to access sophisticated functionality. Controls are comprised of dual concentric knobs for frequency tuning, Com volume/squelch knob, and bezel keys.

1.2.1Power/Com Volume/Squelch Knob

The Power/Com Volume/Squelch knob located in the top left corner of the bezel controls audio volume for the Com radio. Rotating the knob clockwise past the detent turns power on and counter-clockwise turns power off. When the Com radio is active, press the Power/Com Volume/Squelch knob to toggle automatic squelch control On/Off for the Com radio.

Com Mode

Annunciator

Squelch, TX, or RX

Annunciator

Active Frequency

Annunciator

	Graph	Standby Frequency
Com Volume Bar	Graph	Standby Frequency
		Annunciator

Figure 1-2 Com Volume and Squelch Display Description

The Com radio features an automatic squelch to reject many localized noise sources. You may override the squelch function by pressing the Power/Com Volume/Squelch knob. This facilitates listening to a distant station or setting the desired volume level.

To override the automatic squelch, press the Power/Com Volume/Squelch knob momentarily. Press the Power/Com Volume/Squelch knob again to return to automatic squelch operation. A “SQ” indication appears to the left of the active Com frequency window in the upper left corner of the display when automatic squelch is overridden.

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Garmin GTR 225/225A/225B Pilot’s Guide

190-01182-00 Rev. A

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Contents GTR 225/225A/225B November Limited Warranty Garmin GTR 225/225A/225B Pilot’s Guide Operation Product Registration and Support US Toll Free Canada Toll FreeContents Index Index-1 Product Description Photo SensorPower/Com Volume/Squelch Knob Pilot ControlsCom Key Tuning LARGE/SMALL Concentric Cursor KnobsFLIP/FLOP Key MEM KeyFunc Function Key USB PortMON Monitor Key Selecting a Com Frequency Power OnCom Radio Selected FrequencyAfter selecting the desired characters, press ENT Monitoring the Standby Com ChannelSaving a Com Channel Monitor Annunciation Standby Frequency Being MonitoredAfter making a selection, press ENT Selected Wpt TypeEmergency Channel Com Database Look-UpActive and Standby frequencies Remote Frequency Selection Control Stuck MicFrequency Database Reverse Look-Up Airport Identifier Shown For Freqs In DatabaseThis page intentionally left blank SYS Config Com Spacing Functions DescriptionCom Frequencies Press the Func key to access the FunctionsRecent Com Frequencies Selected Frequency Select Wpt Name Select Wpt Type Com User FrequenciesPress the CLR key to delete this User frequency Press ENT Key To Delete Selected FreqSelect User Freq Value Frequencies. Press ENTSelect User Freqs Select User Wpt NameIdentifier Com Database FrequenciesPress ENT Key To Set Selected Freq As Standby Selected Freq As ActiveTurn the Small knob to display the available ACCs Com Nearest Airports APTCom Nearest Area Control Center ACC Frequencies Turn Small Knob To Scroll Through Available AirportsCom Nearest Flight Service Station FSS Frequencies 13 Com Nearest FSS FrequenciesCom Nearest Weather WX Frequencies 14 Com Nearest Weather FrequenciesICS Configuration Adjust IntercomAux Audio Turn the Small knob to turn the Aux Audio On or OffIntercom On/Off function. Then, press the ENT key Intercom On/OffSpeaker On/Off Speaker On/Off function. Then, press ENTCom Spacing System ConfigurationTurn the Small Knob to Select the Channel Spacing Brightness Display BrightnessSelect the Offset Value Display Contrast function. Then, press the ENT key Display ContrastDatabase Info Database Version function. Then, press the ENT keyLoad Database function. Then, press the ENT key Load DatabaseUSB Port USB Cable USB Memory Device Press the Func key to return to the main menu Software VersionSerial Number Serial Number function. Then, press ENTTimers Setting Up the Count Down TimerPressing CLR and then ENT will reset the displayed Timer Setting Up the Count Up TimerViewing Timers in the Com Display Pressing ENT twice will stop the displayed TimerCount Down Timer Value Highlighted When Counting Up 36 Count Down Timer Value Now Counting UpThis page intentionally left blank Troubleshooting AppendixIf in Lock Out mode It can be enabledOr disabled via a Remote mounted Check Mic key inputUpdating the Frequency Database Messages All installations Power has been Re-apply power to the unitSwitch has been Radio will no longer TransmitInstallations This input will nowIndex Stuck mic 2-5 Support