Garmin APOLLO GX SERIES Service Manual

Contents

Garmin AT Rev --© 2004 Garmin AT GX Service Manual 7-43Step General Instruction Specific Steps Expected Results22 Check to see ifemission meetsspecification.On the test box, press the PTTswitch to TX.The Lvl field should read ≥25dB down minimum from markerto right edge of screen (typical> 52 dB down).23 On the test box, press the PTTswitch to RX.24 Add or subtract 25.0kHz to get newcenter freq.Add 0.025 MHz for the upperside band, orSubtract 0.025 MHz for the lowerside band.Example: 127.499639 + 0.025= 127.524712 upper side band.Example: 127.499639 - 0.025 =127.4746390 lower side band.25 Enter the results as the newcenter frequency.26 Check to see ifemission meetsspecification.On the test box, press the PTTswitch to TX.Lvl field should show ≥25 dBdown minimum across theentire screen (typical > -52 dB).27 On the test box, press the PTTswitch to RX.28 Add or subtract 62.5kHz to get newcenter freq.Add 0.0625 MHz for the upperside band, orSubtract 0.0625 MHz for thelower side band.Example: 127.499639 + 0.0625= 127.562139 across the entirescreen (typical > -52 dB).29 Enter that as the new centerfrequency.30 Check to see ifemission meetsspecification.On the test box, press the PTTswitch to TX.Lvl field should show ≥35 dBdown minimum across theentire screen (typical > -52 dB).31 On the test box, press the PTTswitch to RX.32 Add or subtract 500kHz to get newcenter freq.Add 0.500 to recorded centerfreq.Example: 127.499639 + 0.500= 127.999636 upper side band.Example: 127.499639 - 0.500 =126.9996390 lower side band.33 Enter that as the new centerfrequency.34 Check to see ifemission meetsspecification.On the test box, press the PTTswitch to TX.Lvl field should show ≥52 dBdown minimum across theentire screen (typical > -52 dB).35 On the test box, press the PTTswitch to RX.