Honeywell Bendix/King KX 165A Maintenance Manual page 61

BENDIX/KING
3. Sequentially adjust the CPRS1, CPRS2, CPRS3 and CPRS4 for maximum AGC
voltage. Reduce the input level as required to keep the AGC voltage less than 1.5
V. Repeat this sequence as required until no further improvement is noted.
4. Repeat the above steps at frequencies of 127.5 MHz and 136.9 MHz. (Frequencies
122.75 and 132.75 MHz are not programmed).
5.
For radios lacking the 8.33 kHz option:
Advance to the first IFLT page. Apply a 127.50MHz -50 dBm, FM signal sine wave
modulated with 30 kHz peak deviation at a 100 Hz rate to the COM antenna input.
Do not readjust signal generator power level. Monitor U3015-18 using a scope
probe and oscilloscope. Set scope for .2 msec/div. and external trigger on the sine
wave modulation generator. Adjust the Nav inc/dec knobs in each of the two IFLT
pages so that the 21.4 MHz envelope is at a maximum flat response.
For radios having the 8.33 kHz option:
a. Put the KX165A into alignment mode and push the NAV Mode button until the
'CRAG' page appears. Note the setting of 'CRAG' and then turn the Nav Chan-
nel knob until 'CRAG' is at 62.
b. Turn the unit off and then back on. Tune the KX165A to either 127.500 to tune
the wide crystal filters or 127.505 to tune the narrow. Only tune the filter that has
been modified, and only tune the side of the filter (input or output) that has been
modified. Leave all others at the factory setting.
c. Apply a -45dBm rf signal at 127.500MHz to the Com antenna input. FM this sig-
nal at 30kHz peak deviation at a 30Hz rate.
d. Monitor E13 on the IF filter board (200-09709-XXXX) with a scope probe and os-
cilloscope. Set the oscilloscope for 1ms/div and external trigger on the 30Hz
sinewave modulation generator.
e. Adjust either C35 or C36 of the wide filter or C33 or C34 of the Narrow filter for
maximum amplitude with minimum ripple. Only adjust the capacitor on the side
of the filter where a component was replaced. Capacitors on both sides of the
filter will need to be readjusted if the crystal filter has been replaced.
f. Remove the FM from the signal generator and adjust the rf power to -70dBm.
g. Measure IF AGC at P3002 pin 3 using a DVM.
h. Manually adjust the rf frequency ±2.7kHz (narrow) or ±8kHz (wide) in 300Hz
steps. Ensure that the peak to peak voltage change of the IF AGC is less than
12mV. If necessary, readjust the trim capacitor(s).
i. Re-enter alignment mode and return 'CRAG' to its original value.
5.2.2.2.4 COM RF AGC Alignment
NOTE: The Com RF AGC also sets the carrier-squelch threshold.
Rev 0, Jun/2000 15610M00.RCD
KX 165A
Page 5-13