Yaesu FT-891, Техническое дополнение

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FT-891 Technical Supplement
Alignment
ALIGNMENT-8
IF Gain Adjustment

Set the following controls as indicated:
[IPO] : ON
[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 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
CW-USB mode.

Press and hold in the [A], [B] and [C] keys,
w h i l e t u r n i n g t h e r a d i o o n , t o e n t e r t h e
alignment mode.

A d j u s t t h e [ A F ] k n o b s o t h a t t h e A F
millivoltmeter reading is “0 dB”.

Set the RF Signal Generator output level to +10
dBμ.

Adjust the [RF/SQL] knob so that the AF
millivoltmeter reading is “-1.5 ± 0.5 dB”.

Select the appropriate “Alignment menu item”
using the [MULTI] function knob per the
chart below, then set the RF Signal Generator
output to each frequency & level, and adjust
the [RF/SQL] knob for the corresponding AF
millivoltmeter reading at each frequency.

Press and hold in the [F] key to save the new
setting and exit the alignment mode.
Alignment
menu item
VFO-A
Frequency
RF Signal
Generator
Adjust
AF milli-
voltmeter
04-01 IGC 1.8 1.900 MHz
1.900 MHz
+36 dBµ
[AF] knob
0 dB
1.900 MHz
+10 dBµ
[RF/SQL]
knob
-1.5 dB
(±0.5 dB)
04-02 IGC HFL 7.100 MHz
7.100 MHz
+36 dBµ
[AF] knob
0 dB
7.100 MHz
+10 dBµ
[RF/SQL]
knob
-1.5 dB
(±0.5 dB)
04-03 IGC HFM 14.200 MHz
14.200 MHz
+36 dBµ
[AF] knob
0 dB
14.200 MHz
+10 dBµ
[RF/SQL]
knob
-1.5 dB
(±0.5 dB)
04-04 IGC HFH 21.200 MHz
21.200 MHz
+36 dBµ
[AF] knob
0 dB
21.200 MHz
+10 dBµ
[RF/SQL]
knob
-1.5 dB
(±0.5 dB)
04-05 IGC 50 51.900 MHz
51.900 MHz
+36 dBµ
[AF] knob
0 dB
51.900 MHz
+7 dBµ
[RF/SQL]
knob
-1.5 dB
(±0.5 dB)
S-meter Adjustment

Set the VFO-A frequency to 14.200 MHz in the
CW-USB mode.

Set the following controls as indicated:
[IPO] : ON
[ATT] : OFF
[AGC] : AUTO
[RF GAIN] : Fully clockwise

Connect the RF Signal Generator to the ANT
jack, then set the frequency to 14.200 MHz.

Press and hold in the [A], [B] and [C] keys,
w h i l e t u r n i n g t h e r a d i o o n , t o e n t e r t h e
alignment mode.

R e f e r t o t h e c h a r t b e l o w a n d s e l e c t t h e
appropriate “Alignment menu item” using
the [MULTI] function knob. Set the RF Signal
Generator output to each level, and adjust the
[RF/SQL] knob for the corresponding S-meter
reading. Press the [CLAR] key to save the new
setting at each level.
Alignment menu item
RF Signal
Generator
S-meter
05-01 S-MTR 0 OFF S-0
05-02 S-MTR 1 +14 dBµ S-1
05-03 S-MTR 5 +24 dBµ S-5
05-04 S-MTR 7 +30 dBµ S-7
05-05 S-MTR 9 +36 dBµ S-9
05-06 S-MTR +10 +46 dBµ S-9+10dB
05-07 S-MTR +20 +56 dBµ S-9+20dB
05-08 S-MTR +30 +66 dBµ S-9+30dB
05-09 S-MTR +40 +76 dBµ S-9+40dB
05-10 S-MTR +50 +86 dBµ S-9+50dB
05-11 S-MTR +60 +96 dBµ S-9+60dB

Press and hold in the [F] key to save the new
setting and exit the alignment mode.