FT-991 Technical Supplement
Specifications
SPECIFICATIONS-1
General
Rx Frequency Range
:
30 kHz - 56 MHz, 118 MHz - 164 MHz, 420 MHz - 470 MHz (operating)
1.8 MHz - 54 MHz, 144 MHz - 148 MHz, 430 MHz - 450 MHz (specified
performance, Amateur bands only)
Tx Frequency Ranges
:
1.8 MHz - 54 MHz, 144 MHz - 148 MHz, 430 MHz - 450 MHz (Amateur
bands only)
Frequency Stability
:
±0.5 ppm (after 1 minute @+14 °F to +122 °F [–10 °C to +50 °C])
Operating Temperature Range
:
+14 °F to +122 °F (–10 °C to +50 °C)
Emission Modes
:
A1A (CW), A3E (AM), J3E (LSB, USB), F3E (FM), F7W (C4FM), F2D
Frequency Steps
:
5/10 Hz (SSB, CW, & AM), 100 Hz (FM, C4FM)
Antenna Impedance
:
50 Ohms, unbalanced
16.7 - 150 Ohms, unbalanced (Tuner ON, 1.8 MHz - 30 MHz Amateur
bands)
25 - 100 Ohms, unbalanced (Tuner ON,
50 MHz
Amateur band
)
Power Consumption
(Approx.):
Rx (no signal)
1.8 A
Rx (signal present) 2.2 A
Tx
23 A (HF/50 MHz 100 W)
15 A (144/430 MHz 50 W)
Supply Voltage
:
DC 13.8 V ± 15% (Negative Ground)
Dimensions
(WxHxD):
9.0” x 3.2” x 10.0” (229 x 80 x 253 mm)
Weight
(Approx.):
9.5 lbs (4.3 kg)
Transmitter
Power Output
:
5 - 100 watts (2 - 25 watts AM carrier)
Modulation Types
:
J3E (SSB): Balanced,
A3E (AM): Low-Level (Early Stage),
F3E (FM): Variable Reactance
F7W (C4FM): 4-level FSK
Maximum FM Deviation
:
±5.0 kHz/±2.5 kHz
Harmonic Radiation
:
Better than –50 dB (1.8 MHz - 30 MHz Amateur bands)
Better than –63 dB (30 MHz Amateur band
)
Better than –60 dB (144 MHz, 430 MHz Amateur bands
)
SSB Carrier Suppression
:
At least 50 dB below peak output
Undesired Sideband Suppression
: At least 50 dB below peak output
Bandwidth
:
3 kHz (LSB/USB), 500 Hz (CW), 6 kHz (AM), 16 kHz (FM/C4FM)
Audio Response
(SSB):
Not more than –6 dB from 300 to 2700 Hz
Microphone Impedance
:
600 Ohms (200 to 10 kOhms)
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...
