Mocomtech CDM-570 User Manual
Page 228
CDM-570/570L Satellite Modem with Optional IP Module
Revision 4
Summary of Specifications
Reed-Solomon (Closed Network):
220,200 outer code (transparent mode)
200,180 outer code (EDMAC modes)
Interleaver depth = 4
8-PSK/TCM Rate 2/3 (Trellis) with concatenated Reed-Solomon
CLOSED NETWORK - NOT IESS-310 COMPATIBLE
Turbo Product Codec (optional plug-in card):
Rate 5/16 BPSK - 2 dimensional
Rate 21/44 BPSK
- 3 dimensional
Rate 21/44 QPSK/OQPSK - 3 dimensional
Rate 3/4 QPSK/OQPSK/8-PSK/8-QAM/16-QAM - 2 dimensional
Rate 7/8 QPSK/OQPSK/8-PSK/8-QAM/16-QAM - 2 dimensional
Rate 0.95 QPSK/OQPSK/8-QAM/8-PSK - 2 dimensional eTPC
(exact Code Rate is actually 17/18, or 0.944)
Output frequency
CDM-570L: 950 - 1950 MHz, 100 Hz resolution
Stability ±0.06 ppm (±6 x 10
-8
) 0 to 50
o
C (32 to 122
o
F), when using internal reference
CDM-570: 50 - 90 MHz, and 100 – 180 MHz, 100 Hz resolution
Stability ±1.0 ppm (±1 x 10
-6
) 0 to 50
o
C (32 to 122
o
F), when using internal reference
Harmonics
and spurious
Better than -55 dBC/4 kHz (typically <-60 dBC/4 kHz) – measured from 25 MHz to 2 GHz
Transmit on/off ratio
55 dB minimum
Output phase noise
< 0.67
0
rms double sided, 100 Hz to 1 MHz
(minimum of 10 dB better overall than the INTELSAT IESS-308/309 requirement)
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: 50
Ω, 19 dB minimum return loss
CDM-570: 50
Ω, 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
Carrier Off
By TTL 'low' signal or external contact closure - hardware function automatically over-rides processor, or
by RTS signal on main data interface
BUC Reference
(10 MHz)
Phase Noise
On center conductor of L-band output connector; 10.0 MHz ± 0.02 ppm (Optional 1 ppm)
0.0 dBm, ± 3 dBm; programmable ON/OFF
Source: 1. Internal Modem Reference
2. External Reference (10 MHz)
dB/Hz
Frequency Offset
-80
1
Hz
-110
10
Hz
-135
100
Hz
-140
1
kHz
12–2