Comtech EF Data CDM-570A Installation And Operation Manual page 53

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Introduction
Parameter
Scrambling
Clocking Options
External TX Carrier Off
Output Impedance
Output Connector
Output Frequency
Output Phase Noise
Output Power
Power Accuracy
BUC Reference
(10 MHz)
Phase Noise
Specification
• Transparent, Closed Network mode, no R-S or Turbo coding - per ITU V.35 (Intelsat variant)
• EDMAC mode, no R-S coding - externally frame synchronized - proprietary
• Turbo Product Code mode - externally frame synchronized - proprietary
• All R-S modes - externally frame synchronized per IESS-308/309/310
• Internal – CDM-570AL or CDMR-570AL (L-Band)±0.06 ppm (SCT);
CDM-570A (70/140 MHz) ±1.0 ppm (SCT)
• External – Locking over a ±100 ppm range (TT)
• Loop timing (Rx satellite clock) – Supports asymmetric operation; Rx and Tx data rates do not need to be
identical
By TTL 'low' signal or external contact closure – hardware function automatically over-rides processor, or by
RTS signal on main data interface
CDM-570AL or CDMR-570AL (L-Band): 50Ω, >17 dB from 950 to 2250 MHz and >19 dB from 1000 to 1900
MHz minimum return loss
CDM-570A (70/140 MHz): Compatible with 50Ω or 75Ω,17 dB minimum return loss
CDM-570AL or CDMR-570AL (L-Band):Type 'N' female
CDM-570A (70/140 MHz): BNC female
CDM-570AL or CDMR-570AL (L-Band): 950 to 2250 MHz, 100 Hz resolution
Stability ±0.06 ppm (±6 x 10 ) 0 to 50°C (32 to 122°F), when using internal reference
-8
CDM-570A (70/140 MHz): 50 to 90 MHz, and 100 to 180 MHz, 100 Hz resolution
Stability ±1.0 ppm (±1 x 10 ) 0 to 50°C (32 to 122°F), when using internal reference
-6
CDM-570AL or CDMR-570AL (L-Band): <1.2° RMS double-sided, 100 Hz to 1 MHz for CDM-570AL and
CDM-570AL-IP
CDM-570A (70/140 MHz): <0.75° RMS double-sided, 100 Hz to 1 MHz for CDM-570A and CDM-570A-IP
CDM-570AL or CDMR-570AL (L-Band):0 to -40 dBm, 0.1 dB steps - manual mode. Also – see Sect. 1.2.6
for Automatic Uplink Power Control.
CDM-570A (70/140 MHz): 0 to -25 dBm, 0.1 dB steps - manual mode. Also – see Sect. 1.2.6 for Automatic
Uplink Power Control.
CDM-570AL or CDMR-570AL (L-Band): ±1.0 dB over frequency, data rate, modulation type and
temperature
CDM-570A (70/140 MHz): ±0.5 dB over frequency, data rate, modulation type and temperature
CDM-570AL or CDMR-570AL: On center conductor of L-Band output connector; 10.0 MHz ± 0.06 ppm*
(Optional 1 ppm)
-1.0 dBm, ± 4 dBm; programmable ON/OFF
*Source: Selected as Internal.
dB/Hz Frequency Offset
-110 10 Hz
-135 100 Hz
-140 1 kHz
1–15
MN-CDM570A
Revision 3