Yaesu FT-857 HF, Техническое дополнение, Страница: 19 / 82

19
RX Gain Adjustment
1. Tune the transceiver to the 1.8 MHz band in the CW
mode.
2. Select “
HF1RXG
” in the menu by rotating the SELECT
knob, if necessary.
3. Inject an RF signal from the signal generator at 9 dBµ
output.
4. Adjust the “
HF1RXG
” parameter by rotating the main
DIAL
knob to the point where the S-meter indicates
“S1.”
5. The other RX gain adjustments (see the chart below)
should be performed in the same way. The output lev-
els of the signal generator at each frequency are shown
below.
Menu Frequency Output Level of SG
01: HF1RXG
1.8 MHz Band 9 dBµ
02: HF2RXG
7 MHz Band 9 dBµ
03: HF3RXG
21 MHz Band 6 dBµ
04: 50MRXG
50 MHz Band 3 dBµ
05: VHFRXG
144 MHz Band 0 dBµ
06: UHFRXG
430 MHz Band 0 dBµ
SSB S-Meter Adjustment
1. Tune the transceiver to the 21 MHz band in the CW
mode.
2. Inject an RF signal from the signal generator at 36 dBµ
output.
3. Select menu item “
07: SSB-S9
” and press the [
A
] key
to set this parameter.
4. Increase the signal generator output level to 86 dBµ.
5. Select menu item “
08: SSB-FS
” and press the [ A
] key
to set this parameter.
FM S-Meter Adjustment
1. Tune the transceiver to the 144 MHz band in the FM
mode.
2. Inject an RF signal from the signal generator at 0 dBµ
output, with ±3.5 kHz deviation FM Modulation of a 1
kHz tone.
3. Select menu item “
09: FM-S1
” and press the [
A
] key
to set this parameter.
4. Increase the signal generator output level to 25 dBµ.
5. Select menu item “
10: FM-FS
” and press the [ A
] key
to set this parameter.
Alignment
FM Center Meter Adjustment
1. Tune the transceiver to the 144 MHz band in the FM
mode.
2. Inject an RF signal from the signal generator at 10 dBµ
output, with ±3.5 kHz deviation FM Modulation of a 1
kHz tone.
3. Set the frequency of the signal generator 3 kHz below
the receiving frequency of the transceiver.
4. Select menu item “
11: DISC-L
” and press the [
A
] key
to set this parameter.
5. Set the frequency of the signal generator 3 kHz above
the receiving frequency of the transceiver.
6. Select menu item “
12: DISC-H
” and press the [
A
] key
to set this parameter.
FM Squelch Adjustment
1. Tune the transceiver to the 144 MHz band in the FM
mode. Confirm that the squelch knob is turned fully
counterclockwise.
2. Inject an RF signal from the signal generator at –15
dBµ output, with ±3.5 kHz deviation FM Modulation
of a 1 kHz tone.
3. Select menu item “
13: FM-TH1
” and press the [
A
] key
to set this parameter.
4. Select menu item “
14: FM-TH2
” and press the [
A
] key
again.
5. Increase the signal generator output level to 0 dBµ.
6. Select menu item “
15: FM-TI1
” and press the [ A
] key
to set this parameter.
7. Select menu item “
16: FM-TI2
” and press the [ A
] key
again.
Power Supply Voltage Display Adjustment
1. Tune the transceiver to the 144 MHz band in the FM
mode. Confirm that the power supply voltage is 13.8
V (±0.1 V).
2. Select menu item “
17: VCC
” and adjust this param-
eter such that “
138
” is displayed on the LCD.