Yaesu FT-857 series, Technical Supplement

Page: 15 / 82

15
Alignment
FM TX IF Adjustment
1. Tune the frequency to the 28 MHz band. Connect the
RF millivoltmeter to
TP1033
on the MAIN Unit.
2. Disconnect the Coaxial Cable from J1002 and termi-
nate
J1002
into a 50-Ohm dummy load.
3. Key the transmitter in the FM mode, and adjust T1014 ,
T1023
, and
T1021
alternately for maximum indica-
tion on the RF millivoltmeter.
4. Connect the frequency counter to
TP1033
.
5. Key the transmitter in the FM mode without micro-
phone input. Adjust
L1049
for a reading of 68.3300
MHz (±100 Hz).
6. Disconnect the 50-Ohm dummy load and re-connect
the Coaxial Cable to J1002 .
Carrier Balance Adjustment
1. Tune the frequency to the 14 MHz band. Disconnect
the Coaxial Cable from J1002 on the MAIN Unit.
2. Terminate
J1002
into a 50-Ohm dummy load and con-
nect a spectrum analyzer or a RF millivoltmeter at this
point.
3. Key the transmitter in the USB mode without micro-
phone input. Adjust
VR1005
for maximum carrier sup-
pression on the spectrum analyzer or for minimum in-
dication on the RF millivoltmeter.
4. Disconnect the 50-Ohm dummy load and the spectrum
analyzer or the RF millivoltmeter, and re-connect the
Coaxial Cable to
J1002 .
TX BPF Adjustment
VHF TX BPF Adjustment
1. Set the frequency to 145.995 MHz. Disconnect the
Coaxial Cable from J1002 on the MAIN Unit.
2. Connect the spectrum analyzer to
J1002
, which should
be terminated into a 50-Ohm dummy load.
3. Inject a 1 kHz tone at 1 mV level to the
MIC
jack.
4. Key the transceiver in the USB mode, and adjust
T1013
,
T1012
, and
T1011
alternately for maximum
indication on the spectrum analyzer.
5. Disconnect the 50-Ohm dummy load and the spectrum
analyzer, and re-connect the Coaxial Cable to J1002 .
UHF TX BPF Adjustment
1. Set the frequency to 430.000 MHz. Disconnect the
Coaxial Cable from J1002 on the MAIN Unit.
2. Connect the spectrum analyzer to
J1002
, which should
be terminated into a 50-Ohm dummy load.
3. Inject a 1 kHz tone at 1 mV level to the
MIC
jack.
4. Key the transceiver in the USB mode, and adjust
TC1004
,
TC1003
and
TC1002
alternately for maxi-
mum indication on the spectrum analyzer.
5. Disconnect the 50-Ohm dummy load and the spectrum
analyzer, and re-connect the Coaxial Cable to J1002 .
MAIN Unit Alignment Points III
T1019
T1018
T1004
T1005
T1008
TP1043
TP1044
T1027
T1028
TC1004 TC1002
TC1001
T1036
T1030
T1026
T1024
T1035
T1034
T1029
T1010
T1006
TC1005
T1031
T1037
T1009
TC1003