Yaesu FT-817 -, Technical Supplement

Page: 19 / 111

19
Alignment
UHF Band Alignment
1. Connect the DC voltmeter to J1008 (pin 15).
2. Tune the transceiver to 439.995 MHz. Inject an RF sig-
nal from the signal generator at a level of 40dBµ.
3. Adjust TC1001 for minimum indication on the DC volt-
meter.
W-FM Reception Adjustment
1. Connect a SINAD meter to the speaker jack.
2. Tune the transceiver to 88.000 MHz. Inject an RF signal
from a signal generator at a level of 30dBµ, with
±22.5KHz deviation of a 1 kHz audio tone.
3. Adjust TC1003 for the best SINAD sensitivity. Then re-
duce the output level of the signal generator and ad-
just
TC1003 again, as minor improvements of SINAD
may be difficult to observe if the SINAD reading is high.
Image Rejection Trap Adjustment
1. Connect the AF millivoltmeter to the speaker jack.
2. Tune the transceiver to 51.995 MHz in the CW mode.
Inject an RF signal from the signal generator at 68.330
MHz, with 70dBµ output.
3. Adjust T1014 for minimum indication on the AF
millivoltmeter. Then increase the output level of the
signal generator slightly, and adjust
T1014 again (to
ensure maximum rejection).
Noise Blanker Adjustment
1. Connect the DC voltmeter to the base of Q1074 . Tune
the transceiver to 51.995 MHz, and inject an RF signal
from the signal generator at a level of 6 dBµ.
2. Activate the noise blanker, and adjust T1027 for mini-
mum indication on the DC voltmeter.
Q1055 (Pin 5)
T1024
T1021
T1018
T1022 (Pin 5)
VR1001
T1025
T1020
T1029
T1023
T1014
J1002
Q1074 (Base)
T1009
T1008
T1004
T1030
T1027
T1002
T1028
T1026
T1033
Q1038 (Pin 5)
T1011
T1010
TC1002
TC1004
TC1005
T1013
T1012
T1005
J1008 (Pin 15)
T1034
TC1003