Comtech EF Data SNM-1001 - Manual (Page 16)

SNM-1001 Network Control Modem Introduction
Rev. 1 1–5
1.4 Specifications
Table 1-1 and Table 1-2 list the operating specifications of the modem in Burst mode and
Continuous mode, respectively.
Table 1-1. Burst Mode Specifications
General Specifications
Operating Frequency Range 50 to 180 MHz, synthesized in 100 Hz steps
Type of Demodulation QPSK
Operating Channel Spacing Less than 0.5 dB degradation operating with 2 adjacent-like
channels, each 10 dB higher at 1.3 times the symbol rate, or
a minimum of 1.2 times the specified acquisition range
Bit Error Rate See Table 1-3
Digital Interface EIA-422/449 on 37-pin D
Digital Data Rate:
QPSK, 1/2 Rate 19.2 kbit/s
Doppler Buffer N/A
Forward Error Correction Convolutional encoding with soft decision, K=7 Viterbi
decoding.
Data Descrambling Selectable or none, 2 15 -1, synchronous
Prime Power 90 to 264 VAC auto select, 47 to 63 Hz, 50W maximum,
fused at 2A
Size 1.75” H x 19.0” W x 20.1” D (4.44 H x 48.26 W x 51.0 D
cm) (see Figure 2-2)
Operating Temperature 0
°
to 55
°
C (32
°
to 131
°
F)
Storage Temperature -55
°
to +70
°
C (-131
°
to 158
°
F)
Humidity 0 to 95% noncondensing
Diagnostic Features IF Loopback
RF Loopback
Baseband Loopback (bi-directional, electrical)
Fault Monitoring
Bit Error Rate Monitoring
Remote Control via Serial Port
Additional Demodulator Specifications
Input Power (Desired Carrier) -30 to -55 dBm (composite)
+30 dB power within 2 MHz from desired carrier
+40 dB power outside of 2 MHz from desired carrier
– 5 dBm maximum composite
Input Impedance 75 Ω standard
Input Return Loss 20 dB
Carrier Acquisition Range
±
4 kHz minimum
Clock Acquisition Range ± 100 PPM
Acquisition Time < 30 ms
Directed Sweep N/A