Garmin APOLLO GX SERIES, Service Manual

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Garmin AT Rev --
2-10 GX Service Manual © 2004 Garmin AT
VHF Comm Features (GX60/65)
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760 channels
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Frequency range of 118.000 to 136.975 MHz
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Active and standby frequency display
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Transmit status indicator
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Stuck mic time-out
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Frequency monitor function - listen to standby frequency while monitoring active frequency
for any activity
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Weather channels - National Weather Service channels
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Built-in intercom function
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Frequency memory and recall functions
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From navigation data base
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Ten last used
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Ten user stored
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Two microphone inputs
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12 watt audio amplifier
VHF Comm Receiver Performance Specifications (GX60/65)
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Class D
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Frequency range - 118.000 to 136.975 MHz, 760 channels
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Sensitivity
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1 microvolt (2 microvolt hard) for 6 dB S+N/N
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30% modulation at 1000 Hz
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Selectivity
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<6 dB variation at ± 22 kHz
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Speaker audio output level
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12 watts into 4 ohms, 8 watts into 8 ohms
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Headphone audio output level
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280 mW into 100 ohms, 120 mW into 500 ohms
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Distortion - <5% at rated output at 1000 Hz
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AGC characteristics
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<3 dB variation in audio output from 5 to 100 mV input
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15% to 90% modulation
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Squelch control - automatic with manual override