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February 2016
26
YAESU FT-991 MEASURED PERFORMANCE
Review
Transmitter AF distortion: 1% or less
Microphone input sensitivity: 0.5mV for full output
FM deviation: 2kHz narrow / 4kHz wide
SSB T/R switch speed: mute-TX 30ms, TX-mute 4ms, mute-RX 36ms, RX-mute 1ms
NOTES: All signal input voltages given as PD across antenna terminal. Unless stated
otherwise, all measurements made on USB with receiver preamp switched out (IPO)
and 2.4kHz IF bandwidth. CW measurements in 500Hz bandwidth.
“RM” = reciprocal micing.
Receiver Measurements
---------------Sensitivity SSB 10dBs+n:n---------------
----------Input for S9----------
Frequency
IPO
Preamp-1
Preamp-2
IPO
Preamp-1
Preamp-2
1.8MHz
0.5µV (-113dBm)
0.13µV (-125dBm)
0.06µV (-131dBm)
130µV
32µV
9µV
3.5MHz
0.45µV (-114dBm)
0.11µV (-126dBm)
0.06µV (-131dBm)
130µV
32µV
9µV
7MHz
0.45µV (-114dBm)
0.11µV (-126dBm)
0.06µV (-131dBm)
130µV
32µV
9µV
10MHz
0.5µV (-113dBm)
0.13µV (-125dBm)
0.06µV (-131dBm)
130µV
32µV
9µV
14MHz
0.5µV (-113dBm)
0.13µV (-125dBm)
0.06µV (-131dBm)
130µV
32µV
9µV
18MHz
0.5µV (-113dBm)
0.13µV (-125dBm)
0.06µV (-131dBm)
130µV
32µV
9µV
21MHz
0.56µV (-112dBm)
0.14µV (-124dBm)
0.07µV (-130dBm)
130µV
32µV
9µV
24MHz
0.56µV (-112dBm)
0.14µV (-124dBm)
0.07µV (-130dBm)
130µV
32µV
9µV
28MHz
0.56µV (-112dBm)
0.14µV (-124dBm)
0.07µV (-130dBm)
140µV
35µV
9µV
50MHz
0.7µV (-110dBm)
0.18µV (-122dBm)
0.08µV (-129dBm)
90µV
22µV
6µV
144MHz
-
-
0.07µV (-130dBm)
-
-
8µV
432MHz
-
-
0.07µV (-130dBm)
-
-
8µV
AM sensitivity (28MHz) Preamp-1: 1.0µV for 10dBs+n:n at 30% mod depth
FM sensitivity (144MHz): 0.1µV for 12dB SINAD 3kHz pk deviation
AGC threshold Preamp-1: 1.8µV
100dB above AGC threshold for <1dB audio output increase
AGC attack time: approx 1ms
AGC decay time: see text
Max audio at 1% distortion: 2.7W into 4 ohms, 1.8W into 8 ohms
Inband intermodulation products: -35dB to –55dB
S-Reading
----------Input Level USB----------
(7MHz)
IPO
Preamp-1
Preamp-2
S1
10µV
2.5µV
0.6µV
S3
18µV
4.5µV
1.3µV
S5
32µV
8.0µV
2.1µV
S7
56µV
15µV
4.0µV
S9
130µV
32µV
9.0µV
S9+20
1.3mV
320µV
90µV
S9+40
13mV
3.2mV
900µV
S9+60
130mV
32mV
9mV
Bandwidth
------------------------IF Bandwidth------------------------
SET TO
-6dB
-50dB
-60dB
FM 16kHz
14671Hz
23373Hz
24410Hz
FM 9kHz
11116Hz
16481Hz
16899Hz
AM 9kHz
7182Hz
10770Hz
11235Hz
AM 6kHz
5220Hz
8327Hz
8687Hz
USB 2.4kHz
2407Hz
3393Hz
3592Hz
CW 500Hz
499Hz
760Hz
RM noise
CW 100Hz
114Hz
349Hz
395Hz
INTERMODULATION (50kHz tone spacing) 2400Hz bandwidth USB
------------IPO------------
--------Preamp-1--------
--------Preamp-2--------
3rd order
2 tone
3rd order
2 tone
3rd order
2 tone
Frequency
Intercept
Dynamic Range
Intercept
Dynamic Range
Intercept
Dynamic Range
1.8MHz
+22dBm
97dB
+10dBm
97dB
+2.5dBm
96dB
3.5MHz
+21dBm
97dB
+9dBm
97dB
-3dBm
92dB
7MHz
+25.5dBm
100dB
+12dBm
99dB
+1.5dBm
96dB
14MHz
+29.5dBm
102dB
+17.5dBm
102dB
+4dBm
97dB
21MHz
+11dBm
89dB
+0.5dBm
90dB
+0.5dBm
94dB
28MHz
+8dBm
87dB
-4dBm
87dB
-7dBm
89dB
50MHz
RM noise
RM noise
RM noise
RM noise
RM noise
RM noise
144MHz
-
-
-
-
-16dBm
83dB
432MHz
-
-
-
-
-10dBm
87dB
CLOSE-IN INTERMODULATION ON 14MHz
500Hz bandwidth CW Preamp Off (IPO)
3rd order
2 tone
Spacing
Intercept
Dynamic Range
1kHz
-16dBm
75dB
2kHz
-7dBm
81dB
3kHz
+2dBm
87dB
5kHz
+11dBm
93dB
10kHz
+28dBm 104dB
20kHz
+28dBm
104dB
50kHz
+28dBm 104dB
TRANSMITTER MEASUREMENTS
CW
Intermodulation
Power
Products
Frequency
Output
Harmonics
3rd order
5th order
1.8MHz
103W
-68dB
-22dB
-32dB
3.5MHz
111W
-65dB
-26dB
-38dB
7MHz
102W
-69dB
-28dB
-40dB
10MHz
106W
-60dB
-28dB
-40dB
14MHz
105W
-66dB
-22dB
-40dB
18MHz
104W
-67dB
-28dB
-38dB
21MHz
105W
-62dB
-24dB
-40dB
24MHz
105W
-63dB
-23dB
-36dB
28MHz
105W
-70dB
-25dB
-40dB
50MHz
100W
-71dB
-20dB
-30dB
144MHz
68W
<-70dB
-27dB
-42dB
432MHz
46W
-70dB
-30dB
-50dB
Intermodulation product levels are quoted with respect to PEP.
Reciprocal Mixing
Transmit Noise referred to max output
Frequency
Dynamic Range 500Hz BW
100W
100W
50W
Offset
7MHz
21MHz
7MHz
21MHz
144MHz
1kHz
61dB (-88dBC/Hz)
66dB (-93dBC/Hz)
-87dBC/Hz
-91dBC/Hz
-87dBC/Hz
2kHz
69dB (-96dBC/Hz)
70dB (-97dBC/Hz)
-95dBC/Hz
-97dBC/Hz
-89dBC/Hz
3kHz
74dB (-101dBC/Hz)
75dB (-102dBC/Hz)
-100dBC/Hz
-100dBC/Hz
-91dBC/Hz
5kHz
80dB (-107dBC/Hz)
83dB (-110dBC/Hz)
-106dBC/Hz
-107dBC/Hz
-96dBC/Hz
10kHz
87dB (-114dBC/Hz)
91dB (-118dBC/Hz)
-113dBC/Hz
-113dBC/Hz
-106dBC/Hz
15kHz
91dB (-118dBC/Hz)
96dB (-123dBC/Hz)
-118dBC/Hz
-117dBC/Hz
-110dBC/Hz
20kHz
94dB (-121dBC/Hz)
100dB (-127dBC/Hz)
-122dBC/Hz
-120dBC/Hz
-114dBC/Hz
30kHz
98dB (-125dBC/Hz)
104dB (-131dBC/Hz)
-123dBC/Hz
-120dBC/Hz
-116dBC/Hz
50kHz
103dB (-130dBC/Hz)
109dB (-136dBC/Hz)
-125dBC/Hz
-120dBC/Hz
-118dBC/Hz
100kHz
110dB (-137dBC/Hz)
117dB (-144dBC/Hz)
-125dBC/Hz
-120dBC/Hz
-118dBC/Hz
200kHz
120dB (-147dBC/Hz)
123dB (-150dBC/Hz)
-125dBC/Hz
-120dBC/Hz
-118dBC/Hz