Standard Horizon Quest-X GX1500S, Service Manual

Page: 13 / 44

13
Alignment
Sub Receiver Front-end Adjustment
Setup the test equipment as shown below.
Set the RF Signal Generator output to 156.525 MHz,
at a level of +10dBµ, ±3.0 kHz deviation with a 1 kHz
audio tone.
Adjust L1016 , L1015 , and L1014 in order for maxi-
mum indication on the DC voltmeter.
TX Deviation Adjustment
Setup the test equipment as shown below.
Set the AF Signal Generator output to 100 mVrms at 1
kHz.
Set the channel to CH16.
With the PTT switch pressed, adjust VR1003 so that
the maximum deviation is 4.4 kHz ± 0.1 kHz.
Release the PTT switch, then set the AF Signal Gen-
erator output to 1 Vrms at 100 Hz.
With the PTT switch pressed, adjust VR1004 so that
the maximum deviation is 4.4 kHz ± 0.1 kHz.
Release the PTT switch
AF Signal
Generator
Deviation
Meter
50-ohm
Dummy Load
Sampling
Coupler
ANT J1001
Pin 2
GX1500S
Receiver Front-end Adjustment
Setup the test equipment as shown below.
Spectrum
Analizer
Tracking
Generator ANT TP1006
GX1500S
GX1500S-FRONT-END
ATTEN 10dB
RL 10.0dBm 10dB/
CENTER 159.00 MHz
RBW 300 kHz VBW 300 kHz
SPAN 20.00 MHz
SWP 200 ms
DC Voltmeter
RF Signal
Generator
ANT TP1011
GX1500S
P
IN
2 of J
1001
Set the spectrum analyzer as shown below:
CENTER: 159.000 MHz
SPAN: 20.000 MHz
RBW, VBW: 30 kHz
SWP: 200 ms
Set the channel to CH01A.
Adjust L1010 , L1013 , L1027 , L1028 , and L1031 until
the wave form shown in below is obtained.
B
OTTOM
V
IEW