Yaesu FT-991 Operating Manual page 147

Receiver
Circuit Type:
Intermediate Frequencies:
Sensitivity:
Squelch Sensitivity (TYP.):
Selectivity:
Image Rejection:
Maximum Audio Output:
Audio Output Impedance:
Conducted Radiation:
Specifications are subject to change, in the interest of technical improvement, without notice or obligation, and are
guaranteed only within the amateur bands.
FT-991 O
peraTing
SSB/CW/AM: Triple-conversion Super heterodyne
FM/C4FM: Double-conversion Super heterodyne
40.455 MHz
SSB/CW/AM: 69.450 MHz/9.000 MHz/24 kHz
FM/C4FM: 69.450 MHz/450 kHz
SSB/CW (BW: 2.4 kHz, 10 dB S+N/N)
0.158 µV (1.8 - 30 MHz) (AMP 2 "ON")
0.125 µV (50 - 54 MHz) (AMP 2 "ON")
0.11 µV (144 - 148 MHz)
0.11 µV (430 - 450 MHz)
AM (BW: 6 kHz, 10 dB S+N/N, 30 % modulation @400 Hz)
5 µV (0.5 - 1.8 MHz) (AMP 2 "ON")
1.6 µV (1.8 - 30 MHz) (AMP 2 "ON")
1.25 µV (50 - 54 MHz) (AMP 2 "ON")
FM (BW: 15 kHz, 12 dB SINAD)
0.35 µV (28 - 30 MHz) (AMP 2 "ON")
0.35 µV (50 - 54 MHz) (AMP 2 "ON")
0.18 µV (144 - 148 MHz)
0.18 µV (430 - 440 MHz)
There is no specification for frequency ranges not listed.
SSB/CW/AM
1.0 µV (1.8 - 30 MHz, 50 - 54 MHz) (AMP2 "ON")
1.0 µV (144 - 148 MHz, 430 - 450 MHz)
FM
0.35 µV (28 - 30 MHz, 50 - 54 MHz) (AMP2 "ON")
0.125 µV (144 - 148 MHz, 430 - 450 MHz)
There is no specification for frequency range not listed.
Mode
CW/RTTY/PKT
SSB
AM
FM
70 dB or better (1.8 MHz - 50 MHz Amateur bands)
60 dB or better (144/430 MHz Amateur band)
2.5 W into 4 Ohms with 10% THD
4 to 8 Ohms (4 Ohms: nominal)
Less than 4 nW
M
anual
s
pecifications
–6 dB –60 dB
0.5 kHz or better 750 Hz or less
2.4 kHz or better 3.6 kHz or less
6 kHz or better 15 kHz or less
12 kHz or better 30 kHz or less (–50 dB)
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