Yaesu FT-991A, Technical Supplement

Page: 30 / 131

Alignment
ALIGNMENT-19
FT-99
1
Technical Supplement
ALC Meter Adjustment

Connect the Microphone to the front panel MIC
jack.

C o n n e c t t h e 5 0 - O h m D u m m y L o a d a n d
Wattmeter to the “HF/50 MHz” ANT jack.

Set the VFO-A frequency to 14.20 MHz in the
CW mode.

Press and hold in the [A=B], [A/B], and [FAST]
keys, while turning the radio on, to enter the
alignment mode.

Rotate the [MULTI] Dial knob to select the
alignment menu item “13-03 100W TXG HFM”.

Rotate the [CLAR/VFO-B] knob to set the
parameter is "255".

Rotate the [MULTI] Dial knob to select the
alignment menu item “18-01 TX CAR USB”.

Rotate the [CLAR/VFO-B] knob to set the
parameter is "255".

Rotate the [MULTI] Dial knob to select the
alignment menu item “13-01 100W FALC
HFM”.

Rotate the [CLAR/VFO-B] knob to set the
parameter is "0".

Press the PTT button, then adjust the [CLAR/
VFO-B] knob for 100 W ±2.5 W on the Wattmeter.

Release the PTT button.

Set the USB mode.

Set the MIC GAIN to "50".

Connect the Audio Generator to pin 5 of the
MIC jack (pin 4: GND).

Rotate the [MULTI] Dial knob to select the
alignment menu item “20-01 ALC-MTR”.

Press the PTT button, then adjust the Audio
Generator output level to the position where RF
Power output to 88 - 92 W on the Wattmeter.

Release the PTT button.

Increase the Audio Generator output level by
“+10 dB”.

Press the PTT button, then press the [F(M-LIST)]
key while pressing and holding in the PTT
button.

Release the PTT button.

Rotate the [CLAR/VFO-B] knob for maximum
deflection on the ALC meter zone (S9 +10 dB),
then press the [F(M-LIST)] key, while pressing
and holding in the PTT button.

Release the PTT button, then press and hold
in the [MENU(SETUP)] button for one second
to save the new setting and exit the alignment
mode.
TX Output Power/PO Meter/TXG
Adjustment

Referring to table below, tune the transceiver to
each frequency listed.
B
and
VFO-a F
requency
M
Ode
1.8 MHz Band 1.90 MHz CW-USB
7 MHz Band 7.10 MHz CW-USB
14 MHz Band 14.20 MHz CW-USB
21 MHz Band 21.20 MHz CW-USB
50 MHz Band 51.90 MHz CW-USB
144 MHz Band 145.900 MHz CW-USB
430 MHz Band 439.900 MHz CW-USB

Connect the 50-Ohm Dummy Load and Watt-
meter to the “HF/50 MHz” and “144/430 MHz”
ANT jack.

Connect the Microphone to the front panel MIC
jack.

Press and hold in the [A=B], [A/B], and [FAST]
keys, while turning the radio on, to enter the
alignment mode.

Rotate the [MULTI] Dial knob to select the
alignment menu item to “11-01 100W FALC 1.8".

Press and hold the PTT button, then rotate the
[CLAR/VFO-B] knob for 100 W ±3W on the
Wattmeter.

Release the PTT button.

Rotate the [MULTI] Dial knob to select the
alignment menu item to “11-02 MTR 1.8”.

Press and hold the PTT button, then rotate the
[CLAR/VFO-B] knob for 100 W on the PO me
-
ter.

Release the PTT button.

Rotate the [MULTI] Dial knob to select the
alignment menu item to “11-03 TXG 1.8”.

Press and hold the PTT button, then rotate the
[CLAR/VFO-B] knob for "S9+10dB" on the ALC
meter zone.

Release the PTT button.