Comtech EF Data SNM-1002 - Manual (Page 24)

SNM-1002 LinkSync™ Modem Revision 2
Introduction MN/SNM1002.OM
1–6
1.4 Specifications
1.4.1 Summary Specifications
Table 1-1 lists a summary of the specifications.
Table 1-1. Summary Specifications
Parameter Specification
Operating Frequency Range 50 to 180 MHz, in 1 Hz steps
Modulation Type QPSK
BPSK
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.
Digital Interface EIA-422/449 on 37-pin D
Digital Data Rate QPSK, R=1/2, 2.4 kbps to 4.375 Mbps
Scrambling/Descrambling CCIT INTELSAT V.35
Forward Error Correction Viterbi, K=7, Rate 1/2, 3/4, 7/8
Filter Mask Types Closed net (Comtech EF Data)
Modulator
Output Power
-5 to –30 dBm, adjustable in 0.1 dB steps
Output Spurious < -55 dBc, 0 to 500 MHz
Output Impedance 75
Ω (Optional: 50Ω)
Output Return Loss 20 dB
Data Clock Source Internal ,
± 1 x 10 -5 stability
Demodulator
Input Power:
Desired Carrier
Adjacent Carriers
Maximum Total
-30 to –55 dBm
+30 dBc total power within 10 MHz from desired carrier
+40 dBc in-band (0 to 500 MHz)
-5 dBm
Input Impedance 75
Ω (Optional: 50Ω)
Input Return Loss 20 dB
Carrier Acquisition Range
± 35 kHz maximum
Clock Acquisition Range
± 100 PPM
AGC Output 0 to 10V at 10 mA maximum
Default Levels: 0V for –60 dBm
10V for –25 dBm
Levels can be programmed in 0.5V increments.