Garmin GNC 255 Pilot's Manual
Also see for GNC 255: Installation manual
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Contents
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1-2Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A1.2 Pilot ControlsThe GNC 255 controls have been designed to simplify operation of thesystem and minimize workload and the time required to access sophisticatedfunctionality. Controls are comprised of dual concentric knobs for frequencytuning, Com volume/squelch knob, Nav volume/ID knob, and bezel keys.1.2.1 Power/Com Volume/Squelch KnobThe Power/Com Volume/Squelch knob located in the top leftcorner of the bezel controls audio volume for the Com radio.Rotating the knob clockwise past the detent turns power onand counter-clockwise turns power off. When the Com radio isactive, press the Power/Com Volume/Squelch knob to toggleautomatic squelch control On/Off for the Com radio.Squelch, TX, or RXAnnunciatorCom Volume Bar GraphActive FrequencyAnnunciatorCom ModeAnnunciatorActive NavFrequencyStandby FrequencyAnnunciatorFigure 1-2 Com Volume and Squelch Display DescriptionThe Com radio features an automatic squelch to reject many localized noisesources. You may override the squelch function by pressing the Power/ComVolume/Squelch knob. This facilitates listening to a distant station or settingthe desired volume level.To override the automatic squelch, press the Power/Com Volume/Squelchknob momentarily. Press the Power/Com Volume/Squelch knob again toreturn to automatic squelch operation. A “SQ” indication appears to the left ofthe active Com frequency window in the upper left corner of the display whenautomatic squelch is overridden.1.2.2 Nav Volume/ID KnobThe Nav Volume/ID knob located in the bottom left cornerof the bezel controls audio volume for the Nav radio. Press theNav Volume/ID knob and the Morse code tones will be heard.When Morse code tone is active, “ID” will appear to the left ofthe Nav active frequency. |
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