Comtech EF Data CDM-700 - Manual (Page 147)

CDM-700 High Speed Satellite Modem Revision 5
Summary of Specifications MN/CDM700.IOM
10–5
Amplitude Imbalance (I, Q) 0.2 dB maximum
Combined Amplitude Imbalance and
Quadrature Phase Error Single sideband test with suppressed sideband 35 dB minimum
below unmodulated carrier.
Carrier Null 35 dB minimum below an unmodulated carrier.
Frequency Inversion Normal or Inverted
10.5 70 / 140 MHz Demodulator
Item Requirement
IF Frequency 52 to 88MHz / 104 to 176MHz (100Hz steps). Bandwidth spectrum is
contained within IF frequency range.
Impedance 50
Ω or optional 75 Ω
Return Loss 18 dB min
IF Connectors BNC, female
Minimum Signal Level Refer to Figure 10-2.
S_min = -58 + 10
×Log (SR), SR in Msps
S_min = -58 dBm at 1 Msps
S_min = -39.9 dBm at 64 Msps
AGC 45 dB minimum above S_min
Acquisition Time Typical < 5 seconds
Acquisition ± 100kHz
Frequency Inversion Selectable
Adaptive Equalizer Adaptive Linear correction QAM modulations types. Corrects
3 dB linear tilt across 3 dB bandwidth of spectrum.
Composite Input Level 20 dBc composite to desired or +10 dBm maximum, whichever is smaller
FSK CSAT / KST-2000 communications
10.6 L-Band Demodulator
Item Requirement
IF Frequency
950 to 1950 MHz in 100 Hz steps. Bandwidth of spectrum is contained within IF
frequency range.
Impedance 50
Ω
Return Loss 14 dB min
IF Connectors Type N female or optional SMA female
Minimum Signal Level
Refer to Figure 10-2.
S_min = -58 + 10xLog (SR), SR in Msps
S_min = -58.0 dBm at 1 Msps
S_min = -39.9 dBm at 64 Msps
AGC 45 dB minimum above S_min
Acquisition Time Typical < 5 seconds
Acquisition ± 100kHz
Frequency Inversion Selectable
Adaptive Equalizer
Adaptive Linear correction QAM modulations types. Corrects 3 dB linear tilt
across 3 dB bandwidth of spectrum.
Composite Input Level
30 dBc composite to desired or +10 dBm maximum, whichever is smaller
Test at fo ± 200 MHz with CW carrier at desired +30 dBc