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DEMODULATOR
CDM-570 CDM-570L
Input Power Range -30 to -60 dBm (-130 + 10 Log
Symbol Rate) dBm
minimum, (-90 + 10
Log Symbol Rate)
dBm maximum
Max Composite Level +35 dBc, up to
-5 dBm
+35 dBc, up to
-5 dBm
Acquisition Range
Normal mode: ± 1
to ± 32 kHz (1 kHz
steps)
Normal mode: ± 1 to
± 32 kHz (1 kHz
steps)
Wide mode: to ± 200,
symbol rates above
625 ksps
Acquisition Time Example: 150 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 & 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) 21/44 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) 3/4 7/8 0.95
10
-6
6.2 (5.8) 7.0 (6.6) 9.3 (8.9)
10
-8
6.8 (6.3) 7.2 (6.8) 10.3 (9.9)
(8-QAM) 3/4
7/8 0.95
10
-6
6.5 (6.1) 6.6 (6.2) 9.6 (9.2)
10
-8
7.2 (6.8) 6.8 (6.4) 10.6(10.2)
8-PSK TCM/RS (Closed Network RS)
(See the CDM-570 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 signal level
MODULATOR
CDM-570 CDM-570L
Frequency Stability
±1 ppm, 0º to 50ºC
(32º to 122ºF)
±0.06 ppm, 0º to
50ºC (32º to 122ºF)
Output Power 0 to –20 dBm, 0.1 dB
steps
Accuracy
± 0.5 dB over
frequency and
temperature
± 1.0 dB over
frequency and
temperature
Phase Noise < 0.75 degrees RMS
double-sided,
100 Hz to 1 MHz
< 1.2 degrees RMS
double-sided,
100 Hz to 1 MHz
Output Spectrum/
Filtering
Meets IESS-308/-309 power spectral mask
Harmonics and
Spurious
< -55 dBc/4 kHz
(Typically < -60 dBc/4 kHz)
Transmit On/Off Ratio 55 dB minimum
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
(CDM-570 Only)
LNB Voltage +13, +18, and +24 VDC @ 500 mA maximum
10 MHz Reference
Power Level
-3 dBm ± 3 dB via Rx center conductor
BLOCK UP CONVERTER (BUC) SUPPORT
(CDM-570L Only)
BUC Voltage 24 VDC, 4A, 100W (internally fitted option)
48 VDC, 3A, 180W (internally fitted option)
10 MHz Reference
Power Level
-3 dBm ± 3 dB via Rx center conductor
FSK Support Via Tx center conductor with FSK BUCs
(110 strony)
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