Garmin GNC400, Процедура выравнивания

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GNC 400 COMM TRANSCEIVER ALIGNMENT PROCEDURE
P/N 005-00051-55 REV. T
Page 6
(C300 only on –02 and lower 10 Watt comm boards)
Y301 TCXO Trimmer Factory preset
(Y301 only on –03 and higher 10 Watt comm boards, and 16 Watt comm boards)
L302 VCO Coil Mid - range as Factory preset
R558 MIC GAIN Fully CW
R530 TX Driver Bias Fully CCW
R563 TX PA-A Fully CCW
R532 TX PA-B Fully CCW
(R558, R530, R563, and R532 only on –04 and lower 10 Watt comm boards)
3.1.2 Digital Pots
PRESELECTOR POLE 1 Software Default
PRESELECTOR POLE 2 Software Default
PRESELECTOR POLE 3 Software Default
PRESELECTOR POLE 4 Software Default
RF AGC THRESHOLD Software Default
(RF AGC THRESHOLD only on –00 10 Watt comm board)
NOISE SQUELCH Software Default
(NOISE SQUELCH only on –01 and higher 10 Watt comm boards, and 16 Watt
comm boards)
SQUELCH 25 kHz Software Default
SQUELCH 8.33 kHz Software Default
TRANSMITTER POWER Software Default
MODULATION DEPTH Software Default
SIDETONE ADJ Software Default
PA BIAS CURRENT Software Default
DRIVER BIAS CURRENT Software Default
MIC GAIN Software Default
(PA and DRIVER BIAS CURRENT and MIC GAIN only on –05 and higher 10
Watt comm boards, and 16 Watt comm boards)
3.1.3 Covers
Remove the covers from the synthesizer and RF sections.
3.2 Synthesizer Alignment
NOTE: All synthesizer adjustments should be completed within 60 seconds of a cold start.
3.2.1 VCO Alignment
a. Power up the comm unit in test mode.
b. Change the display to the comm alignment test page
c. Set the Channel Spacing switch for 25 kHz channel spacing.
d. Set the frequency to 136.975 MHz.
e. Monitor TP303 voltage with a DMM.
f.
Adjust VCO coil L302 until the voltage reads 11.0
±
0.1V. If the tuning voltage cannot be set
to 11V, adjust for the maximum voltage achievable. The voltage must be greater than 9.50
VDC.
g. Apply Q-Dope (GPN 291-00024-00) to L302.