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