Comtech EF Data CDM-600/600L - Manual (Page 48)

CDM-600/600L Open Network Satellite Modem Revision 3
Introduction MN/CDM600L.IOM
1–20
Tx On/Off ratio
CDM-600L: -75 dBm maximum
CDM-600: 55 dB minimum
External TX Carrier
Off
By TTL 'low' signal or external contact closure - hardware function automatically overrides processor
Clocking options CDM-600L: Internal, ±1ppm or 0.02 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 Clock at Tx data rate.
CDM-600: Internal, ±1.5ppm or 0.02 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 Clock
CDM-600 ONLY:
Output impedence
50 Ω and 75Ω, front panel selectable
21 dB minimum return loss
Output phase noise < 0.48 0 rms double sided, 100 Hz to 1MHz
(minimum of 16 dB better overall than the INTELSAT IESS-308/309 requirement)
CDM-600L ONLY:
External Reference
1, 2, 5, 10, or 20 MHz @ 0 dBm to +20 dBm.
Internal reference phase locks to external reference.
BUC Reference
(10 MHz)
Phase Noise
On center conductor of L-Band output connector; 10.0 MHz ± 0.02 ppm (Optional 1ppm)
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
-150 10 kHz
-150 100 kHz
Output Phase Noise dB/Hz Frequency Offset
-63.0 100 Hz
-73.0 1 kHz
-83.0 10 kHz
-93.0 100 kHz
Fundamental AC line spurious is -42 dBc or lower
The sum of all other single sideband spurious, from 0 to 0.75 x symbol rate, is -48 dBc or lower
BUC Supply Voltage
(Suppplied through Tx
IF center conductor and
selectable ON/OFF via
M&C control)
Standard unit has no BUC supply.
Optional BUC Supply:
• 24VDC, 4.0 Amps maximum, 100W
• 48VDC, 3.75 Amps maximum, 180W
BUC Current
Monitor
Min/Max programmable current alarm thresholds.
BUC Monitoring
(FSK ON)
Power level, temperature, power class, PLL lock.
BUC Power
Leveling (FSK ON) Modem levels BUC output power by increasing or decreasing carrier output to match programmed
target level.
Tx Carrier ON Delay Delay from power on to Tx IF output allowing BUC to warm up. Programmable 0 to 200 sec.