Reference Frequency Adjustment; Transmitter Vcv Adjustment; Transmit Power Adjustment; Receiver Vcv Adjustment - Standard Horizon MATRIX GX3000S Service Manual

Alignment

Reference Frequency Adjustment

Setup the test equipment as shown below.
Sampling
Coupler
50-ohm
Dummy Load
Frequency
Counter
Set the channel to CH16.
Use the [ H/L ( NAV )] key to set the transceiver to "LOW"
power.
With the PTT switch pressed, adjust TC1003 so that
the Frequency Counter reading is 156.800 MHz ± 100
Hz.
Release the PTT switch.

Receiver VCV Adjustment

Setup the test equipment as shown below.
GX3000S
TP1005
Set the channel to CH16.
Adjust TC1001 so that the DC voltmeter reading is
1.5 V ± 0.1 V.
L
1006
L
1001
L
1002
TP
1004
L
1003
12
GX3000S
ANT
DC Voltmeter
L L
1007 1008
L L
1004 1005
RF UNIT A

Transmitter VCV Adjustment

Setup the test equipment as shown below.
50-ohm
Dummy Load
Set the channel to CH16.
With the PTT switch pressed, adjust TC1002 so that
the DC voltmeter reading is 3.0 V ± 0.1 V.
Release the PTT switch.

Transmit Power Adjustment

Setup the test equipment as shown below.
50-ohm
Dummy Load
Set the channel to CH16.
Use the [ H/L ( NAV )] key to set the transceiver to "HI"
power.
With the PTT switch pressed, adjust VR1001 so that
RF output power is 24 W ± 0.3 W.
Release the PTT switch, then set the transceiver to
"LOW" power by the [ H/L ( NAV )] key.
With the PTT switch pressed, adjust VR1002 so that
RF output power is 0.8 W ±0.1 W.
Release the PTT switch.
VR VR
1002 1001
TC
TC
1002 1001
P
LIGNMENT OINT
GX3000S
DC Voltmeter
ANT TP1008
Inline
Wattmeter ANT
GX3000S
VR
1003
VR
1004
TP
1009
JP
1001
TC
1003
TP
1008
TP
1005