Mcf Adjustment - Yaesu FT-991A Technical Supplement

MCF Adjustment (1)

 Set the VFO-A frequency to 145.900 MHz in the
CW-USB mode.
 Set the following controls as indicated:
[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 "144/430
MHz" ANT jack, then set the output level to +0
dBµ at the 145.900 MHz.
 Adjust T1001, T1003 and T1025, T1026 on the
MAIN Unit in succession several times for
maximum deflection on the AF millivoltmeter.
Note: If the S-meter deflects while adjusting,
reduce the RF Signal Generator output so
that the S-meter does not deflect.
 Set the FM mode.
 Connect the SINAD meter and 4 Ohm dummy
load to the EXT SP jack.
 Connect the RF Signal Generator to the "144/430
MHz" ANT jack, then set the output level to –9
dBµ at the 145.900 MHz with ±3.5 kHz devia-
tion FM modulation of a 1 kHz audio signal.
 Adjust T1025 on the MAIN Unit in succession
several times for maximum deflection on the
SINAD meter.
Note: Do not adjust T1025 more than 180 degrees
rotation.
T1001
T1003
TC1001
TC1007
MCF Adjustment (2)
 Set the VFO-A frequency to 439.900 MHz in the
CW-USB mode.
 Set the following controls as indicated:
[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 "144/430
MHz" ANT jack, then set the output level to +0
dBµ at the 439.900 MHz.
 Adjust TC1001 and TC1007 on the MAIN
Unit in succession several times for maximum
deflection on the AF millivoltmeter.
Note: If the S-meter deflects while adjusting,
reduce the RF Signal Generator output so
that the S-meter does not deflect.
ALIGNMENT-7
Alignment
T1025
T1026
FT-99 Technical Supplement
1