Tx Deviation Adjustment; Receiver Front-End Adjustment; Sub Receiver Front-End Adjustment - Standard Horizon QUEST-X GX1500S Service Manual

TX Deviation Adjustment

Setup the test equipment as shown below.
Sampling
Coupler
50-ohm
ANT
Dummy Load
Deviation
Meter
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
B
AF Signal
GX1500S
J1001
Generator
Pin 2
P 2 of J
IN 1001
V
OTTOM IEW

Receiver Front-end Adjustment

Setup the test equipment as shown below.
Tracking
Generator ANT
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.
ATTEN 10dB
RL 10.0dBm
CENTER 159.00 MHz
RBW 300 kHz VBW 300 kHz

Sub Receiver Front-end Adjustment

Setup the test equipment as shown below.
RF Signal
Generator
ANT
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.
Alignment
Spectrum
GX1500S
TP1006 Analizer
10dB/ GX1500S-FRONT-END
SPAN 20.00 MHz
SWP 200 ms
GX1500S
DC Voltmeter
TP1011
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