Comtech EF Data SDM-300A - Manual (Page 361)

SDM-300A Satellite Modem Revision 6
Specifications MN/SDM300A.IOM
19–5
19.4 Modulator Specifications
Table 19-4. Modulator Specification
Parameter Specifications
Data Clock Source Internal, ± 1 x 10 -5 stability
Internal High Stability, ± 2 x 10 -7 (Optional)
Output Frequency Stability ± 10 PPM
Output Impedance 75 Ω (50 Ω Optional)
Output Power -5 to –30 dBm, adjustable in 0.1 db steps
+5 to –20 dBm, high-power output (Optional)
Output Spurious -55 dBc in-band (0 to 500 MHz)
Output Return Loss 20 dB
19.4.1 Digital Data Rate
The digital data rate is selctable in 1 bps steps. The modem automatically calculates and sets
the symbol rate. Data rates entered that exceed the data rate or symbol rate specification are
rejectred at entry. The symbol rate range is 4.8 kHz to 2.5 MHz.
Table 19-5. Modulator Digital Data Rate
Data Rate Range
Modulation Type Encoding Type Min Max
BPSK 1/2
{O}QPSK 1/2
{O}QPSK 3/4
{O}QPSK 7/8
8-PSK 2/3 Viterbi
Viterbi
Viterbi
Viterbi
Viterbi 2.4 kbps
4.8 kbps
7.2 kbps
8.4 kbps
512 kbps 1.25 Mbps
2.5 Mbps
3.75 Mbps
4.375 Mbps
5.0 Mbps
BPSK 1/2
QPSK 1/2
QPSK 3/4
QPSK 7/8 Sequential
Sequential
Sequential
Sequential 2.4 kbps
4.8 kbps
7.2 kbps
8.4 kbps 1.25 Mbps
2.5 Mbps
3.75 Mbps
4.375 Mbps
BPSK 5/16
BPSK 21/44
{O}QPSK 1/2
{O}QPSK 3/4
8-PSK 3/4 Turbo
Turbo
Turbo
Turbo
Turbo 2.4 kbps
2.4 kbps
4.8 kbps
7.2 kbps
384 kbps 781.25 kbps
1193 kbps
2386 kbps
3750 kbps
5.0 Mbps
BPSK 1/2
{O}QPSK 1/2
{O}QPSK 3/4
{O}QPSK 7/8
8-PSK 2/3 Viterbi and Reed-Solomon
Viterbi and Reed-Solomon
Viterbi and Reed-Solomon
Viterbi and Reed-Solomon
Viterbi and Reed-Solomon 2.4 kbps
4.8 kbps
7.2 kbps
8.4 kbps
512 kbps 1.138 Mbps
2.277 Mbps
3.416 Mbps
3.986 Mbps
4.555 Mbps