Alignment
ALIGNMENT-7
FT-99
1
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.
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.
T1025
T1026
T1001
T1003
TC1001
TC1007
Summary of Contents for FT-991A
Page 10: ...BLOCK DIAGRAM 1 FT 991 Technical Supplement Block Diagram...
Page 11: ...CONNECTION DIAGRAM 1 FT 991 Technical Supplement Connection Diagram...
Page 36: ...FT 991 Technical Supplement MAIN 1 Circuit Diagram MAIN Unit...
Page 37: ...FT 991 Technical Supplement MAIN 2 Parts Layout side A MAIN Unit 1 2 3 4 5 A B C D E F G...
Page 38: ...FT 991 Technical Supplement MAIN 3 Parts Layout side B MAIN Unit 1 2 3 4 5 a b c d e f g...
Page 68: ...FT 991 Technical Supplement PLL 1 PLL Unit Circuit Diagram...
Page 69: ...FT 991 Technical Supplement PLL 2 PLL Unit Parts Layout side A side B 1 2 3 A B C...
Page 73: ...FT 991 Technical Supplement EDSP 1 Circuit Diagram EDSP Unit...
Page 79: ...FT 991 Technical Supplement CNTL 1 CNTL Unit Circuit Diagram...
Page 80: ...FT 991 Technical Supplement CNTL 2 CNTL Unit Parts Layout side A A B C D E F G 1 2 3 4...
Page 81: ...FT 991 Technical Supplement CNTL 3 CNTL Unit Parts Layout side B a b c d e f g 1 2 3 4...
Page 87: ...FT 991 Technical Supplement HF PA 1 HF PA Unit Circuit Diagram...
Page 88: ...FT 991 Technical Supplement HF PA 2 HF PA Unit Parts Layout side A 1 2 3 4 A B D F G E C 5...
Page 89: ...FT 991 Technical Supplement HF PA 3 HF PA Unit Parts Layout side B 1 2 3 4 a b d f g e c 5...
Page 96: ...FT 991 Technical Supplement V_U PA 1 Circuit Diagram V_U PA Unit...
Page 97: ...FT 991 Technical Supplement V_U PA 2 V_U PA Unit Parts Layout side A 1 2 3 A B C D E F G H...
Page 98: ...FT 991 Technical Supplement V_U PA 3 V_U PA Unit Parts Layout side B 1 2 3 a b c f h j d e g i...
Page 105: ...FT 991 Technical Supplement PANEL 1 Circuit Diagram PANEL Unit...
Page 113: ...FT 991 Technical Supplement TUNER 1 TUNER Unit Circuit Diagram...
Page 114: ...FT 991 Technical Supplement TUNER 2 TUNER Unit Parts Layout side A 1 2 3 4 A B C D E F G H...
Page 115: ...FT 991 Technical Supplement TUNER 3 TUNER Unit Parts Layout side B...
Page 119: ...JACK 1 JACK Unit Circuit Diagram FT 991 Technical Supplement...
Page 120: ...JACK 2 JACK Unit Parts Layout side A side B FT 991 Technical Supplement...
Page 122: ...FT 991 Technical Supplement SCP 1 Circuit Diagram SCP Unit...
Page 123: ...FT 991 Technical Supplement SCP 2 Parts Layout SCP Unit side A side B...
Page 127: ...FT 991 Technical Supplement DSP 1 DSP Unit Circuit Diagram...
Page 128: ...FT 991 Technical Supplement DSP 2 DSP Unit Parts Layout side A side B...