Yaesu FT-897, Техническое дополнение

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17
Alignment
RX Gain Adjustment
r
Select the CW mode. Tune the transceiver to the 1.8
MHz band. Select “
HF1RXG
” in the menu by rotating
the MEM/VFO CH knob, if necessary. Inject an RF
signal from the signal generator at 9 dBµ output.
r
Adjust the “
HF1RXG
” parameter by rotating the main
dial to the point where the first dot of the S-meter (S1)
appears.
r
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 dBu
02: HF2RXG
7 MHz Band 9 dBu
03: HF#RXG
21 MHz Band 6 dBu
04: 50MRXG
50 MHz Band 0 dBu
05: VHFRXG
144 MHz Band 0 dBu
06: UFFRXG
430 MHz Band 0 dBu
SSB S-Meter Adjustment
r
Tune the transceiver to the 21 MHz band in the CW
mode. Inject an RF signal from the signal generator at
36 dBµ output.
r
Select menu item “
07: SSB-S9
” and press the [
A
] key
to set this parameter.
r
Tune the transceiver to the 21 MHz band in the CW
mode. Inject an RF signal from the signal generator at
86 dBµ output.
r
Select menu item “
08: SSB-FS
” and press the [
A
] key
to set this parameter.
FM S-Meter Adjustment
r
Tune the transceiver to the 144 MHz band in the FM
mode. Inject an RF signal from the signal generator at
0 dBµ output, with ±3.5 kHz deviation FM Modula-
tion of a 1 kHz tone.
r
Select menu item “
09: FM-S1
” and press the [
A
] key
to set this parameter.
r
Increase the output level of the signal generator up to
25 dBµ. Select menu item “
10: FM-FS
” and press [ A ]
key to set this parameter.
FM Center Meter Adjustment
r
Tune the transceiver to the 144 MHz band in the FM
mode. Inject an RF signal from the signal generator at
10 dBµ output, with ±3.5 kHz deviation FM Modula-
tion of a 1 kHz tone.
r
Set the frequency of the signal generator 3 kHz below
the receiving frequency of the transceiver. Select menu
item “
11: DISC-L
” and press the [
A
] key to set this
parameter.
r
Set the frequency of the signal generator 3 kHz above
the receiving frequency of the trans-ceiver. Select menu
item “
12: DISC-H
” and press the [ A ] key to set this
parameter.
FM Squelch Adjustment
r
Tune the transceiver to the 144 MHz band in the FM
mode. Confirm that the squelch knob is turned fully
counterclockwise.
r
Inject an RF signal from the signal generator at -15
dBµ output, with ±3.5 kHz deviation FM Modulation
of a 1 kHz tone. Select menu item “
13: FM-TH1
” and
press the [ A ] key to set this parameter. Select menu
item “
14: FM-TH2
” and press the [
A
] key again.
r
Inject an RF signal from the signal generator at 0 dBµ
output, with ±3.5 kHz deviation FM Modulation of a 1
kHz tone. Select menu item “
15: FM-TI1
” and press
the [
A
] key to set this parameter. Select menu item
“
16: FM-TI2
” and press the [ A ] key again.
Power Supply Voltage Display Adjustment
r
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).
r
Select menu item “
17: VCC
” and adjust this param-
eter such that “
138
” is displayed on the LCD.