Alignment
ALIGNMENT-15
FT-99
1
Technical Supplement
Drive Stage Idling Current Adjustment
Connect the DC ammeter to J4506 on the V_
U-PA Unit.
Press and hold the PTT button, while adjust
VR4502 so the DC ammeter reading is “100 mA
(±10 mA)”.
Release the PTT button.
Disconnect the DC ammeter from J4506.
Re-connect the red cable to J4503 on the V_
U-PA Unit.
Semi-Final Stage Idling Current Adjustment
Connect the DC ammeter to J4507 on the V_
U-PA Unit.
Press and hold the PTT button, while adjust
VR4505 so the DC ammeter reading is “600 mA
(±50 mA)”.
Adjust VR4506 so the DC ammeter reading is
“1.2 A (±0.1 A)”.
Release the PTT button.
Disconnect the DC ammeter from J4507.
Final Stage Idling Current Adjustment
Disconnect the red cable from J4503 on the V_
U-PA Unit.
Connect the DC ammeter between J4503 and
red cable.
Press and hold the PTT button, while adjust
VR4503 so the DC ammeter reading is “800 mA
(±50 mA)”.
Release the PTT button.
Disconnect the DC ammeter from J4503 and red
cable, then connect the red cable to J4503.
Disconnect the 50-Ohm resistors from J4501
and J4502, then connect the coaxial cables to
J4501 and J4502.
Re-connect the jumper plugs to J4505, J4506 and
J4507.
V_U-PA Unit TX Adjustment
Set the VFO-A frequency to 439.990 MHz in the
USB mode.
Connect the 50-Ohm Dummy Load and Watt-
meter to the “144/430 MHz” ANT jack.
Connect the Audio Generator to pin 5 of the
MIC jack (pin 4: GND), then set the output level
to 0.5 mV @1 kHz.
Press the PTT button, then adjust the MIC gain
to set the RF Power output to 25 W on the Watt
-
meter.
Press the PTT button, adjust TC4501 for maxi
-
mum deflection on the Wattmeter.
Release the PTT button.
VR4502
VR4506
J4506
J4507
J4503
VR4505
VR4503
J4501
J4502
J4505
TC4501
Содержание FT-991A
Страница 10: ...BLOCK DIAGRAM 1 FT 991 Technical Supplement Block Diagram...
Страница 11: ...CONNECTION DIAGRAM 1 FT 991 Technical Supplement Connection Diagram...
Страница 36: ...FT 991 Technical Supplement MAIN 1 Circuit Diagram MAIN Unit...
Страница 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...
Страница 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...
Страница 68: ...FT 991 Technical Supplement PLL 1 PLL Unit Circuit Diagram...
Страница 69: ...FT 991 Technical Supplement PLL 2 PLL Unit Parts Layout side A side B 1 2 3 A B C...
Страница 73: ...FT 991 Technical Supplement EDSP 1 Circuit Diagram EDSP Unit...
Страница 74: ...FT 991 Technical Supplement EDSP 2 Parts Layout EDSP Unit side A side B 1 2 3 A B C D 1 2 3 a b c d 4 4...
Страница 79: ...FT 991 Technical Supplement CNTL 1 CNTL Unit Circuit Diagram...
Страница 80: ...FT 991 Technical Supplement CNTL 2 CNTL Unit Parts Layout side A A B C D E F G 1 2 3 4...
Страница 81: ...FT 991 Technical Supplement CNTL 3 CNTL Unit Parts Layout side B a b c d e f g 1 2 3 4...
Страница 87: ...FT 991 Technical Supplement HF PA 1 HF PA Unit Circuit Diagram...
Страница 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...
Страница 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...
Страница 96: ...FT 991 Technical Supplement V_U PA 1 Circuit Diagram V_U PA Unit...
Страница 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...
Страница 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...
Страница 105: ...FT 991 Technical Supplement PANEL 1 Circuit Diagram PANEL Unit...
Страница 106: ...FT 991 Technical Supplement PANEL 2 Parts Layout PANEL Unit side A side B 1 2 3 a b c d e f g h A B C D E F G H 1 2 3...
Страница 113: ...FT 991 Technical Supplement TUNER 1 TUNER Unit Circuit Diagram...
Страница 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...
Страница 115: ...FT 991 Technical Supplement TUNER 3 TUNER Unit Parts Layout side B...
Страница 119: ...JACK 1 JACK Unit Circuit Diagram FT 991 Technical Supplement...
Страница 120: ...JACK 2 JACK Unit Parts Layout side A side B FT 991 Technical Supplement...
Страница 122: ...FT 991 Technical Supplement SCP 1 Circuit Diagram SCP Unit...
Страница 123: ...FT 991 Technical Supplement SCP 2 Parts Layout SCP Unit side A side B...
Страница 127: ...FT 991 Technical Supplement DSP 1 DSP Unit Circuit Diagram...
Страница 128: ...FT 991 Technical Supplement DSP 2 DSP Unit Parts Layout side A side B...