Yaesu FT-991A, Техническое дополнение

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Alignment
ALIGNMENT-9
FT-99
1
Technical Supplement
IF Gain Adjustment

Set the following controls as indicated:
[IPO] : AMP1
[ATT] : OFF
[AGC] : AUTO
[RF GAIN] : Fully clockwise

Connect the AF millivoltmeter and 4 Ohm
dummy load to the EXT SP jack.

Connect the RF Signal Generator to the “HF/50
MHz” ANT jack, then set the output level to
+36 dBµ at 1.900 MHz.

Set the VFO-A frequency to 1.900 MHz in the
USB mode.

Press and hold in the [A=B], [A/B], and [FAST]
keys, while turning the radio on, to enter the
alignment mode.

Adjust the [AF GAIN] knob so that the AF mil-
livoltmeter reading is “0 dB”.

Set the RF Signal Generator output level to +10
dBµ.

Adjust the [CLAR/VFO-B] knob so that the AF
millivoltmeter reading is “-1.5 ± 0.5 dB”.

Select the appropriate “Alignment menu item”
using the [MULTI] Dial knob per the chart be-
low, then set the RF Signal Generator output to
each frequency & level, and adjust the [CLAR/
VFO-B] knob for the corresponding AF milli-
voltmeter reading at each frequency.

Press and hold in the [MENU(SETUP)] button
for one second to save the new settings and exit
the alignment mode.
Alignment
menu item
VFO-A
Frequency
RF Signal
Generator
Adjust
AF millivoltmeter
04-01 IGC 1.8 1.900 MHz
1.900 MHz, +36 dBµ [AF GAIN] knob 0 dB
1.900 MHz, +10 dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)
04-02 IGC HFL 7.100 MHz
7.100 MHz, +36 dBµ [AF GAIN] knob 0 dB
7.100 MHz, +10 dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)
04-03 IGC HFM 14.200 MHz
14.200 MHz, +36 dBµ [AF GAIN] knob 0 dB
14.200 MHz, +10 dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)
04-04 IGC HFH 21.230 MHz
21.230 MHz, +36 dBµ [AF GAIN] knob 0 dB
21.230 MHz, +10 dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)
04-05 IGC 50 51.900 MHz
51.900 MHz, +36 dBµ [AF GAIN] knob 0 dB
51.900 MHz, +7 dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)
04-06 IGC 144 145.900 MHz
145.900 MHz, +30 dBµ [AF GAIN] knob 0 dB
145.900 MHz, -3 dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)
04-07 IGC 430 439.900 MHz
439.900 MHz, +30 dBµ [AF GAIN] knob 0 dB
439.900 MHz, -3dBµ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)