Cdm-710L (L-Band) Modulator; Demodulator; Cdm-710 (70/140 Mhz) Demodulator - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710 Broadcast Satellite Modem
Introduction
1.4.2.2

CDM-710L (L-Band) Modulator

Description
Frequency
Impedance
Connector
Return Loss
Output Power
Output Power Accuracy
Output Power Stability
Carrier Mute
Harmonics and Spurious
Integrated Phase Noise
Spectral Inversion
Quadrature Phase Error
Quadrature Amplitude
Imbalance
Carrier Null
Combined Amplitude
Imbalance and Quadrature
Phase Error
1.4.3

Demodulator

1.4.3.1

CDM-710 (70/140 MHz) Demodulator

Description
Frequency Range
Impedance/Connector
Return Loss
Input Power, Minimum
AGC Range
Max Composite Level
Acquisition Range
Acquisition Time
Adaptive Equalizer
BER Performance
IQ Test Point
950 to 2000 MHz in 100 Hz steps. Bandwidth of transmitted spectrum is within IF
frequency range.
50Ω
Type N Male
15 dB
-5 to -25 dBm in 0.1 dB steps.
Carrier is not interrupted when changing between output power levels or removing
data connections.
± 0.5 dB at 25°C
Within ± 0.5 dB of 25C value over all specified environments
55 dB below main carrier output
-55 dBc/4 kHz over operating frequency range (excludes spectral mask area) and is
with a modulated carrier.
-55 dBc/4 kHz 250 to 950 MHz, 1950 to 2500 MHz
Continuous component < 1 degrees RMS double-sided, 100 Hz to 10 MHz
Normal or Inverted
< 2°
0.2 dB maximum
35 dB below an unmodulated carrier
Single sideband test with suppressed sideband 35 dB minimum below unmodulated
carrier
52 to 88 and 104 to 176 MHz in 100 Hz steps
50 Ω or optional 75 Ω/BNC Female
18 dB
-58 + 10xLog(Symbol Rate in MHz) dBm,
-58 dBm at 1 Msps, -41.5 dBm at 45 Msps. See Figure 1-8.
45 dB above minimum
+20 dBc composite to desired up to +10 dBm
± 100 kHz programmable in 1 kHz steps
Typical < 10 seconds, DVB-S2 Pilots On.
Up to 3 dB tilt
See Table 1-2 through Table 1-5
Accessible from rear panel Alarm connector
Requirements
Requirements
1–16
Revision 11
MN/CDM710.IOM