Transmitter Vcv Adjustment; Transmit Power 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/E
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/E
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/E
DC Voltmeter
ANT TP1008
Inline
GX3000S/E
Wattmeter
ANT
VR
1003
VR
1004
TP
1009
JP
1001
TC
1003
TP
1008
TP
1005