Honeywell Bendix/King KX 165A Maintenance Manual page 62

BENDIX/KING
1. Ensure that the Com preselector cover is in place. Tune the COM Receiver to
127.500 MHz. Note the Com RF AGC voltage on P3003-2 with no input signal ap-
plied to the receiver.
2. Adjust the Signal Generator to 127.500 MHz with a level of -67 dBm 30% AM mod-
ulated with 1 kHz and apply the signal to the Com receiver.
3. Continue to monitor the Com RF AGC voltage on P3003-2.
4. Adjust the Nav inc/dec knobs so that CRAG value decreases until the RF AGC volt-
age drops to at least 0.5 V less than the voltage observed with no input signal.
5. Increase the input level to +6dBm and monitor the Comm audio output at P3002-1.
Ensure the audio signal is not noticeably distorted. If necessary, readjust the COM-
AGC up to 2 steps in either direction to minimize distortion with the +6 dBm input.
5.2.2.2.5 COM RF Squelch Alignment
1. Advance to the SNSQ page.
2. Set Signal Generator to 127.500MHz, 1KHz 30% AM with a power level of -
106dBm.
3. Monitor the COM Audio at TP3001 (P3002-A) with an oscilloscope.
4.
For radios lacking the 8.33 kHz option:
Adjust Nav inc/dec knobs so that SNSQ opens at -106dBm.
For radios having the 8.33 kHz option:
Adjust Nav inc/dec knobs so that SNS8 opens at -106 dBm.
5.2.2.3 Navigation Receiver Alignment
5.2.2.3.1 NAV VCO
1. Tune NAV Receiver to 117.950MHz with the unit out of the alignment mode.
2. Monitor the DC voltage at TP3008 (or P3001-26). It should be 7.25 V +1.0/-0.75 V.
3. If adjustment is necessary, enter the alignment mode and go to the NVCO page.
Using the Nav inc/dec knobs, increase the value if the voltage at TP3008 was too
high or decrease the value if the voltage at TP3008 was too low. Repeat steps 1
and 2.
NOTE: While in the NVCO alignment page, the frequency is limited to 113.5 MHz.
In order to observe the effects of this adjustment at the other frequencies, it is nec-
essary exit the alignment mode by turning the unit off and back on again.
4. Tune the NAV Receiver to 108.05MHz.
5. Verify TP3008 voltage is not less than 3.0V. If it is not, adjust NVCO so that the
117.950MHz and 108.050MHz can be tuned while maintaining a maximum of 8.25
V and a minimum of 3.0 V.
Page 5-14 15610M00.RCD
KX 165A
Rev 0, Jun/2000