Honeywell Bendix/King KX 165A Maintenance Manual page 60

BENDIX/KING
high or decrease the value if the voltage at TP3003 was too low. Repeat steps 1
and 2.
Note: While in the CVCO alignment page, the frequency is limited to 127.5 MHz.
In order to observe the effects of this adjustment at the other frequencies, it is nec-
essary to exit the alignment mode by turning the unit off and back on again.
4. Tune the receiver to 118.0 MHz and depress MIC KEY, P155A1-6 on the rear con-
nector to engage TX mode. Caution: connect a dummy load to the Com antenna
connector.
5. Check that the tuning voltage is not less than 2.4 V. Select the value of C129 as
required. If necessary, readjust the voltage upward to as high as 8.7 V max at
136.900 MHz RX, to ensure that it remains above 2.4 V min at 118 MHz TX. Do not
exceed 8.50 V tuning voltage on any unit which has a 9 V line voltage (measured at
P3001-17) of less than 9.1 V.
5.2.2.2.2.2
1. Tune COM Receiver to 136.900MHz.
2. Monitor the DC voltage at TP3 (or P3001-12).
3. Adjust C146 for 8.4 +.1/-.4 V tuning at TP3.
4. Tune the receiver to 118.0 MHz and depress MIC KEY, P155A1-6 on the rear con-
nector to engage TX mode. Caution: connect a dummy load to the Com antenna
connector.
5. Check that the tuning voltage is not less than 2.4 V. If necessary, readjust C146 tun-
ing voltage upward to as high as 8.7 V max. at 136.9000 MHz RX, to ensure that it
remains above 2.4 V min at 118 MHz TX. If it is necessary to increase the 136.900
MHz RX tuning voltage above 8.5 V, temporarily lower the 9 V live voltage down to
9.0 V (measured at P3001-17), and ensure that the Com synthesizer remains
locked.
6. Perform this step only if a component in the Q3015 circuit has been changed. Dis-
connect P4005 from J3005. Terminate the transmitter (P155A3) into 50 ohms.
Monitor the level at J3005 when in the transmit mode at 127.5 MHz. Make this mea-
surement with either a 50 ohm spectrum analyzer or a milliwattmeter preceded by
an appropriate lowpass filter to exclude the effects of the harmonic energy. Select
R3095, if necessary, to provide +15.5 dBm ±1 dB.
5.2.2.2.3 COM RF Preselector and IF Filter Alignment
NOTE: These steps are performed with the unit in the alignment mode.
1. Monitor the DC RF AGC voltage on P3003-2. Ensure that the COM preselector cov-
er is in place.
2. Set the receiver frequency to 118.1 MHz receiver. Apply an input signal at the re-
ceiver input (J3006) at a frequency of 118.1 MHz. Adjust the input level such that
an AGC voltage of NMT 1.5 V is observed.
Page 5-12
Radios having the 8.33 kHz option
15610M00.RCD
KX 165A
Rev 0, Jun/2000