140 Mhz Demodulator; L-Band Demodulator - Comtech EF Data CDM-700 Installation And Operation Manual

CDM-700 High Speed Satellite Modem
Summary of Specifications
Amplitude Imbalance (I, Q)
Combined Amplitude Imbalance and
Quadrature Phase Error
Carrier Null
Frequency Inversion

10.5 70 / 140 MHz Demodulator

Item
IF Frequency
Impedance
Return Loss
IF Connectors
Minimum Signal Level
AGC
Acquisition Time
Acquisition
Frequency Inversion
Adaptive Equalizer
Composite Input Level
FSK

10.6 L-Band Demodulator

Item
IF Frequency
Impedance
Return Loss
IF Connectors
Minimum Signal Level
AGC
Acquisition Time
Acquisition
Frequency Inversion
Adaptive Equalizer
Composite Input Level
0.2 dB maximum
Single sideband test with suppressed sideband 35 dB minimum
below unmodulated carrier.
35 dB minimum below an unmodulated carrier.
Normal or Inverted
Requirement
52 to 88MHz / 104 to 176MHz (100Hz steps). Bandwidth spectrum is
contained within IF frequency range.
50 Ω or optional 75 Ω
18 dB min
BNC, female
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
45 dB minimum above S_min
Typical < 5 seconds
± 100kHz
Selectable
Adaptive Linear correction QAM modulations types. Corrects
3 dB linear tilt across 3 dB bandwidth of spectrum.
20 dBc composite to desired or +10 dBm maximum, whichever is smaller
CSAT / KST-2000 communications
Requirement
950 to 1950 MHz in 100 Hz steps. Bandwidth of spectrum is contained within IF
frequency range.
50 Ω
14 dB min
Type N female or optional SMA female
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
45 dB minimum above S_min
Typical < 5 seconds
± 100kHz
Selectable
Adaptive Linear correction QAM modulations types. Corrects 3 dB linear tilt
across 3 dB bandwidth of spectrum.
30 dBc composite to desired or +10 dBm maximum, whichever is smaller
Test at fo ± 200 MHz with CW carrier at desired +30 dBc
10–5
Revision 5
MN/CDM700.IOM