Yaesu FT-817 Technical Supplement page 18

Alignment
Local Oscillator Adjustment
nd
2 Local Adjustment
1. Connect the RF millivoltmeter or an oscilloscope to
Q1038 (pin 5).
2. Adjust T1024 and T1026 alternately for maximum in-
dication on the millivoltmeter or for maximum ampli-
tude on the oscilloscope.
3. Confirm the indicated voltage is at least 120 mVrms or
330 mVp-p.
3 rd Local Adjustment
1. Connect the RF millivoltmeter or an oscilloscope to pin
5 of Q1055.
2. Key the transceiver in the CW mode, and adjust T1021
for maximum indication on the RF millivoltmeter.
3. Confirm that the indicated voltage is at least 70 mVrms
or 200 mVp-p.
TX IF Adjustment
CW TX IF Adjustment
1. Tune the frequency to 1.8 MHz in the CW mode. Con-
nect the RF millivoltmeter to J1002, terminated by a 50
Ohm dummy load.
2. Key the transceiver, and adjust T1020, T1012, and T1005
alternately for maximum indication on the RF
millivoltmeter.
FM TX IF Adjustment
1. Tune the frequency to the 29 MHz band in the FM
mode. Leave the RF millivoltmeter connected to J1002,
still terminated by the 50 Ohm dummy load.
2. Key the transceiver, and adjust T1012 and T1013 alter-
nately for the maximum indication on the RF
millivoltmeter.
3. Tune the frequency to the 144 MHz band in the FM mode.
4. Again key the transceiver in the FM mode (without
microphone audio input). Adjust T1018 for a reading
of ±100 Hz on the frequency counter.
Carrier Balance Adjustment
1. Terminate J1002 with a 50 Ohm dummy load, and con-
nect a spectrum analyzer or a RF millivoltmeter to
J1002.
2. Key the transceiver in the USB mode on the 28 MHz
band (without microphone input). Adjust VR1001 for
the maximum carrier suppression on the spectrum ana-
lyzer, or for the minimum indication on the RF
millivoltmeter.
18
VHF TX BPF Adjustment
1. Set the frequency at 145.995 MHz. Connect the RF
millivoltmeter to J1002 terminated by a 50ohm dummy load.
2. Key the transceiver on FM mode and adjust T1011,
T1010, and T1009 alternately for the maximum indica-
tion on RF millivoltmeter.
UHF TX BPF Adjustment
1. Set the frequency to 439.995 MHz. Connect the RF
millivoltmeter to J1002, which still should be termi-
nated by the 50 Ohm dummy load.
2. Key the transceiver in the FM mode, and adjust TC1005,
TC1004 and TC1002 alternately for maximum indica-
tion on the RF millivoltmeter.
RX Adjustment
The PA Unit must be connected during RX adjustment.
Note that the signal generator should not be connected to
J1008 (pin 15) because DC voltage is present there.
RX IF Adjustments
Connect the signal generator to the antenna connector,
and a SINAD meter to the speaker jack.
SSB IF Adjustment
1. Connect the DC voltmeter to J1008 (pin 15).
2. Tune the transceiver to 51.995 MHz. Inject an RF signal
from the signal generator at a level of 40 dBµ.
3. Adjust T1033, and T1029 alternately for the minimum
indication on the DC voltmeter.
4. Now select the FM mode. Turn off the RF injection from
the signal generator output.
5. Adjust T1034 for maximum indication on the DC volt-
meter.
FM IF Adjustment
1. Tune the transceiver to 51.995 MHz. Inject an RF signal
from the signal generator at a level of 10 dBµ, with 1
kHz of FM modulation at ±3.5 kHz deviation.
2. Adjust T1023, T1025, T1028, T1030 and T1034 alter-
nately for the best SINAD sensitivity.
VHF Band Alignment
1. Connect the DC voltmeter to J1008 (pin 15).
2. Tune the transceiver to 145.995 MHz. Inject an RF sig-
nal from the signal generator at a level of 40dBµ.
3. Adjust T1002, T1004, and T1008 alternately for the
minimum indication on the DC voltmeter.