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Figure 1-5. PSK modem applications.
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TM-11-5820-803-12 Modem Digital Data MD-921/G (NSN 5820-00-155-8581) Manual
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Tabulated Data cont'd

TM 11-5820-803-12
1-10.  Tabulated Data.
Prime Power
120 ±10 percent volts ac, single phase
Voltage
Current
5 amperes maximum
Frequency
45 to 420 Hz
Power
500 watts maximum
Operating Conditions
Operation
Continuous
Temperature
32°F to 120°F
Relative Humidity
5 to 100 percent
Elevation
Up to 10,000 feet
IF Interface
Modulator
Power Level
+10 dBm (terminated)
50 ohm, ±10 percent, unbalanced
Impedance
± 1 kHz at 70 MHz
Frequency Uncertainty
Frequency Output
70 MHz center frequency, double sideband suppressed
carrier
Type Modulation
Binary phase shift keying (PSK)
3 dB Bandwidth of Internal
Filtering
#1 (19.200 kb/s to 999.99 kb/s
3 MHz maximum
symbol rate)
#2 (1.0000 Mb/s to 3.9999 Mb/s
12 MHz maximum
symbol rate)
#3 (4.0000 Mb/s to 9.9999 Mb/s
No filter
symbol rate)
Demodulator
Power Level
-20 to -75 dBm or 0 to -55 dBm, selectable
50 ohm, ± 10 percent, unbalanced
Impedance
Acquisition Time
45 seconds maximum
Acquisition Range
± 5 kHz at 70 MHz
Frequency Input
70 MHz center frequency, double sideband suppressed
carrier
Type Modulation
Binary phase shift keying (PSK)
Bit Error Rate Performance
1.1 dB maximum at symbol rates from 19.200 kb/s to
1.0000 Mb/s. 1.3 dB maximum at symbol rates from
1.0000 Mb/s to 9.9999 Mb/s
Line of Sight Baseband Interface
Output
Power Level
-12 dBm (terminated)
75 ohms, ±10 percent, unbalanced
Impedance
Input
Power Level
-25 to -35 dBm (terminated)
75 ohms, ± 10 percent, unbalanced
Impedance
Data Rate Range
19.2 kb/s to 5.0 Mb/s
Shielded RF Cable Interface
Output
Power Level
+23, +10, and 0 dBm (terminated)
Impedance
50 ohms, ±10 percent, unbalanced
75 ohms, ± 10 percent, unbalanced
75 ohms, ± 10 percent, balanced
1-6

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