Standard Communications mt930b, Service Manual

Page: 15 / 155

Specifications
M
M
T
T
9
9
3
3
0
0
B
B
S
S
e
e
r
r
v
v
i
i
c
c
e
e
M
M
a
a
n
n
u
u
a
a
l
l
P
P
a
a
g
g
e
e
2
2
-
-
5
5
AUDIO #1 FM DEMODULATOR CHARACTERISTICS
Sub carrier Frequency Tuning Frequency 0.05 to 9.995 MHz
440 440 ± 60 / 720 ± 180 kHz
330 330 ± 50 / 540 ± 120 kHz
IF Bandwidth
At – 3 dB / - 20 dB
Ref. Max. Level
150 150 ± 40 / 300 ± 90 kHz
Minimum Input Level at 150 kHz Bandwidth
Hum and Noise = 68 dB S/N
≤
10 mV rms
AUDIO #1 OUTPUT CHARACTERISTICS
Output Impedance 600 ± 30 ohms
300 kHz p-p Deviation
440 kHz p-p IF Bandwidth
300 kHz p-p Deviation
330 kHz p-p IF Bandwidth
Output Level
300 kHz p-p Deviation
150 kHz p-p IF Bandwidth
≥
18dBm
400 kHz p-p Deviation
440 kHz p-p IF Bandwidth
300 kHz p-p Deviation
330 kHz p-p IF Bandwidth
Frequency Response
De-emphasis 50 µsec, 75 µsec,
J17, or Flat
100 kHz p-p Deviation
150 kHz p-p IF Bandwidth
± 2 dB (20 Hz to 15 kHz)
400 kHz p-p Deviation
440 kHz p-p IF Bandwidth
100 kHz p-p Deviation
330 kHz p-p IF Bandwidth
Harmonic Distortion at 1 kHz
100 kHz p-p Deviation
150 kHz p-p IF Bandwidth
≤
1%
400 kHz p-p Deviation
440 kHz p-p IF Bandwidth
100 kHz p-p Deviation
330 kHz p-p IF Bandwidth
Hum and Noise at 20 Hz to 15 kHz;
De-emphasis = 50 µsec, 75 µsec;
Input Level = 100mV
100 kHz p-p Deviation
150 kHz p-p IF Bandwidth
≥
72 dB
≥
66 dB
≥
60 Db
100 Hz
≥
68 dB
1 kHz
≥
68dB
440 / 330 kHz
IF Bandwidth
10 kHz
≥
55dB
100 Hz
≥
61dB
1 kHz
≥
68dB
Channel Separation
Audio #1 to #2; #1 to #3
Audio #2 to #1; #2 to #3
440 / 330 / 150 kHz
IF Bandwidth
10 kHz
≥
55dB
(Continued)