Comtech EF Data CDM-570 Installation And Operation Manual page 52

CDM-570/570L Satellite Modem with Optional IP Module
Introduction
Output Frequency CDM-570L: 950 - 2000 MHz, 100 Hz resolution
Stability ±0.06 ppm (±6 x 10
CDM-570: 50 - 90 MHz, and 100 – 180 MHz, 100 Hz resolution
Stability ±1.0 ppm (±1 x 10
Harmonics
Better than -55 dBC/4 kHz (typically <-60 dBC/4 kHz) – measured from 25 MHz to 2 GHz
and Spurious
Transmit On/Off Ratio 55 dB minimum
Output Phase Noise <0.75° RMS double-sided, 100 Hz to 1 MHz for CDM-570 and CDM-570 IP
<1.2° RMS double-sided, 100 Hz to 1 MHz for CDM-570L and CDM-570L IP
Output Power CDM-570L: 0 to -40 dBm, 0.1 dB steps - manual mode. See Automatic Uplink Power Control section
CDM-570: 0 to -25 dBm, 0.1 dB steps - manual mode. See Automatic Uplink Power Control section also.
Power Accuracy CDM-570L: ±1.0 dB over frequency, data rate, modulation type and temperature
CDM-570: ±0.5 dB over frequency, data rate, modulation type and temperature
Output Impedance
CDM-570L: 50Ω, 19 dB minimum return loss
CDM-570: Compatible with 50Ω or 75Ω,17 dB minimum return loss
Output Connector CDM-570L: Type N female
CDM-570: BNC female
Clocking Options CDM-570L: Internal, ±0.06 ppm (SCT)
CDM-570: Internal, ±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
External TX By TTL 'low' signal or external contact closure - hardware function automatically over-rides processor, or by RTS
Carrier Off signal on main data interface
BUC Reference On center conductor of L-band output connector; 10.0 MHz ± 0.06 ppm* (Optional 1 ppm)
(10 MHz) -1.0 dBm, ± 4 dBm; programmable ON/OFF
*Source: Selected as Internal
Phase Noise dB/Hz
-110
-135
-1407
-8 ) 0 to 50°C (32 to 122°F), when using internal reference
-6 ) 0 to 50°C (32 to 122°F), when using internal reference
Frequency Offset
10 Hz
100 Hz
1 kHz
1–12
Revision 12
MN/CDM570L.IOM