Vertex Standard VX-1210, Руководство по обслуживанию, Страница: 24 / 76

24
Transmitter Alignment
MIC Gain Alignment
r
Connect the AF millivoltmeter to TP1003 on the MAIN Unit.
r
Connect the AF Generator to the MIC IN jack on the MIC
Adapter Unit.
r
Select the “
TX IF
” channel (10.25000 MHz, USB).
r
Inject a signal from the AF Generator to 1500 Hz, then adjust
the AF Generator output level for 8 mV.
r
Key the transmitter, adjust VR1001 on the MAIN Unit for
30 mV ± 3 mV on the AF millivoltmeter.
TX IF Coils Alignment
r
Remove the coaxial plug from
J1004
on the MAIN Unit,
then connect the RF millivoltmeter and 50
W
resistor to
J1004 .
r
Connect the AF Generator to the MIC IN jack on the MIC
Adapter Unit.
r
Select the “
TX IF
” channel (10.25000 MHz, USB).
r
Inject a signal from the AF Generator to 1500 Hz, then adjust
the AF Generator output level so that the RF millivoltmeter
reading is approximately 0 dBm.
r
Key the transmitter, adjust T1010 , T1018 , T1019 , T1020 ,
and
T1022
on the MAIN Unit in succession several times
for maximum indication on the RF millivoltmeter.
r
Disconnect the RF millivoltmeter and 50
W
resistor, then re-
place the plug into J1004 .
Carrier Balance Pre-Alignment
r
Remove the coaxial plug from
J1004
on the MAIN Unit,
then connect the RF millivoltmeter and 50
W
resistor to
J1004
.
r
Select the “
TX IF
” channel (10.25000 MHz, USB).
r
Key the transmitter with no microphone input, adjust
TC1002
and VR1003 on the MAIN Unit for minimum indication on
the RF millivoltmeter.
r
Disconnect the RF millivoltmeter and 50
W
resistor, then re-
place the plug into
J1004
.
Alignment
MAIN Unit Alignment Points [1]
T1018
T1022
T1020
T1019
T1010
J1004
TP1003
TC1002
VR1003
VR1001