Comtech EF Data SNM-1001 - Manual (Page 17)

Introduction SNM-1001 Network Control Modem
1–6 Rev. 1
Table 1-2. Continuous Mode Specifications
General Specifications
Operating Frequency Range 50 to 180 MHz, synthesized in 100 Hz steps
Type of Modulation 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
Phase Noise In accordance with IESS-308
Digital Interface
(Field Changeable Plug-in Modules)
One Interface per Module) EIA-422/449 on 37-pin D
Digital Data Rates:
QPSK, 1/2 Rate 19.2 kbit/s
Doppler Buffer Programmable from 64 to 65536 bits, or from 1 to 50 ms
total depth
Forward Error Correction Convolutional encoding with soft decision K=7 Viterbi
decoding, Sequential decoding
Data Scrambling CCITT V.35
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 Modulator Specifications
Output Power -5 to -30 dBm, adjustable in 0.1 dB steps
Output Spurious and Harmonics -55 dBc in 4 kHz BW in-band (50 to 180 MHz)
-55 dBc in 4 kHz BW out-of-band (0 to 500 MHz)
Output Impedance 75
Ω
standard
Output Return Loss 20 dB
Output Frequency Stability ± 10 PPM
Data Clock Source Internal or external
External clock
± 100 PPM and < 5 % jitter
Internal Data Clock Stability ± 10 PPM