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© 2004 Comtech EF Data Part Number DS-CDM570L.DOC Page 3 of 4 9/22/04
CDM-570L
L-Band Satellite Modem
2.4 kb
s to 5 Mb
s
DEMODULATOR
Input Power Range (-130 + 10 Log Symbol Rate) dBm minimum
(-90 + 10 Log Symbol Rate) dBm maximum
Max Composite Level +43 dBc, up to -10 dBm
Acquisition Range
Normal mode: ± 1 to ± 32 kHz (1 kHz steps)
Wide mode: to ± 200 kHz, symbol rates
above 625 Ksym/sec
Acquisition Time Example: 200 ms average at 64 kbps Rate
1/2 QPSK, and ± 32 kHz acquisition range
EXAMPLE BER PERFORMANCE
Met with two adjacent carriers 7 dB higher
Guaranteed E
b
/N
o
, in dB (Typical values in parentheses)
Viterbi
(B, QPSK/OQPSK) 1/2
3/4 7/8
10
-5
5.4 (4.9) 6.8 (6.3) 7.7 (7.2)
10
-7
6.7 (6.2) 8.2 (7.7) 9.0 (8.6)
Viterbi and concatenated Reed-Solomon 220/200 or 200/180
(B, QPSK/OQPSK) 1/2
3/4 7/8
10
-5
4.3 (4.0) 5.6 (4.7) 6.5 (6.0)
10
-7
4.5 (4.2) 6.0 (5.2) 6.9 (6.5)
Turbo Product Codec
(QPSK/OQPSK) 1/2
3/4 7/8 0.95
10
-6
2.9 (2.6) 3.8 (3.4) 4.3 (4.0) 6.4 (6.0)
10
-8
3.3 (2.8) 4.4 (4.0) 4.5 (4.2) 6.9 (6.5)
8-PSK TCM/RS
(Closed Network RS)
(See the CDM-570L manual for a complete
listing of the performance of all FEC types,
Code Rates, and Modulation types.)
Receive Buffer 512, 1024, 2048, 4096, 8182, or 16384 bits
Receive Clock Options Rx Satellite, Tx Terrestrial,
Internal Reference
Clock Tracking
± 100 ppm minimum
External Reference
Input
Female BNC connector 1, 2, 5, 10, or 20 MHz
Monitor Functions E
b
/N
o
, Frequency Offset, BER,
Buffer fill status,
Rx receive signal level
MODULATOR
Output
Spectrum/filtering
Meets IESS-308/309 power spectral mask
Frequency Stability
± 0.06 ppm, 0 to 50ºC (32 to 122ºF)
Harmonics and
Spurious
< -55 dBc/4 kHz (Typically < -60 dBc/4 kHz)
Transmit On/Off Ratio 55 dB minimum
Phase Noise < 1.2 degrees RMS double-sided,
100 Hz to 1 MHz
Output Power 0 to -40 dBm, 0.1 dB steps
Accuracy
± 1.0 dB over frequency and temperature
External Tx Carrier Off By TTL LOW signal, or RTS
Tx Clock options Internal (SCT), External (TT), Loop timing
LOW-NOISE BLOCK CONVERTER (LNB ) SUPPORT
LNB Voltage +13 volts, +18 volts and +24 volts DC
at 500 mA max
10 MHz Reference
Power Level
-3 dBm ± 3dB via Rx center conductor
BLOCK UPCONVERTER (BUC) SUPPORT
BUC Voltage 24 VDC, 4 amps, 100W (Internally-fitted Option)
48 VDC, 3 amps, 180W (Internally-fitted Option)
10 MHz Reference
Power Level
0 dBm ± 3dB via Tx center conductor
FSK support Via Tx center conductor with FSK BUCs
(41 páginas)
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