CDM-710 Broadcast Satellite Modem
Revision 11
Introduction
MN/CDM710.IOM
1–16
1.4.2.2 CDM-710L (L-Band) Modulator
Description
Requirements
Frequency
950 to 2000 MHz in 100 Hz steps. Bandwidth of transmitted spectrum is within IF
frequency range.
Impedance
50
Ω
Connector
Type N Male
Return Loss
15 dB
Output Power
-5 to -25 dBm in 0.1 dB steps.
Carrier is not interrupted when changing between output power levels or removing
data connections.
Output Power Accuracy
±
0.5 dB at 25
°
C
Output Power Stability
Within
±
0.5 dB of 25C value over all specified environments
Carrier Mute
55 dB below main carrier output
Harmonics and Spurious
-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
Integrated Phase Noise
Continuous component < 1 degrees RMS double-sided, 100 Hz to 10 MHz
Spectral Inversion
Normal or Inverted
Quadrature Phase Error
< 2
°
Quadrature Amplitude
Imbalance
0.2 dB maximum
Carrier Null
35 dB below an unmodulated carrier
Combined Amplitude
Imbalance and Quadrature
Phase Error
Single sideband test with suppressed sideband 35 dB minimum below unmodulated
carrier
1.4.3
Demodulator
1.4.3.1 CDM-710 (70/140 MHz) Demodulator
Description
Requirements
Frequency Range
52 to 88 and 104 to 176 MHz in 100 Hz steps
Impedance/Connector
50
Ω
or optional 75
Ω
/BNC Female
Return Loss
18 dB
Input Power, Minimum
-58 + 10xLog(Symbol Rate in MHz) dBm,
-58 dBm at 1 Msps, -41.5 dBm at 45 Msps. See
AGC Range
45 dB above minimum
Max Composite Level
+20 dBc composite to desired up to +10 dBm
Acquisition Range
±
100 kHz programmable in 1 kHz steps
Acquisition Time
Typical < 10 seconds, DVB-S2 Pilots On.
Adaptive Equalizer
Up to 3 dB tilt
BER Performance
See
through
IQ Test Point
Accessible from rear panel Alarm connector
Содержание CDM-710
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Страница 242: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX ...