Technical Specifications
Detailed subsystem and operational parameters
| SYSTEM SPECIFICATIONS | |
|---|---|
| Channel Symbol Rates | 1024000, 512000, 256000, 128000 (in symbols per second) |
| Modulation | BPSK, QPSK, 8-PSK, and 16-QAM |
| Optional Code Types |
• BPSK and QPSK (IESS-308), Viterbi rate ½, R-S(126,112) outer coding, ID=4
• 8-PSK/TCM (IESS-310), R-S(219,201) outer coding, ID=8
• 16-QAM (EN 301 210), R-S(204,188) outer coding, ID=12
|
| Ambiguity Encoding |
Binary / Quaternary / 8PSK-TCM / 16QAM-TCM / R-S (Test mode supports 16QAM-TCM-manual ambiguity decoding) |
| Scrambling | CCITT V.35 |
| Data Interface | RS-449 |
| IF Frequency | 70 MHz (fixed) |
| Power Supply |
+5V DC, 1.1A (Modem) +5V DC, <0.7A (Receive only module) |
| MODULATOR SPECIFICATIONS | |
|---|---|
| Transmit Power |
-9 dBm (BPSK, QPSK, and 8-PSK) -6.7 dBm (16-QAM) |
| Spectral Shaping |
• BPSK & QPSK: As per Figure 8 of IESS-308
• 8-PSK: As per Figure 10 of IESS-310
• 16-QAM: As per Figure A.1 of EN 301 210
For design details refer to pulse.pdf
|
| Modulator Timing | Internal |
| Output Impedance | 50 ohms |
| DEMODULATOR SPECIFICATIONS | |
|---|---|
| Receive Level | -15 dBm to -5 dBm |
| Acquisition Type | Continuous / Burst |
| Continuous Mode Carrier acquisition range & time (at 1024000 baud) |
• BPSK: ±80 kHz, < 75 ms
• QPSK: ±40 kHz, < 150 ms
• 8-PSK: ±15 kHz, < 1.4 s
• 16-QAM: ±5 kHz
|
| Burst Mode Carrier acquisition range & time (at 1024000 baud) |
• QPSK: ±50 kHz, < 78.125 µs
• Coded QPSK: ±16 kHz, < 140.625 µs
• 8-PSK: ±8 kHz, < 140.625 µs
• 16-QAM: ±4 kHz, < 203.125 µs
|
| Continuous Mode Tracking |
• BPSK: 0.0234% of baud rate
• QPSK: 0.0117% of baud rate
• 8-PSK: 0.0058% of baud rate
• 16-QAM: 0.0029% of baud rate
|
| Demodulator Timing | Recovered clock within ±13% jitter and nominally within 40-60% duty cycle |
| Input Impedance | 50 ohms |
| ENVIRONMENTAL, FEATURES & BURST MODE | |
|---|---|
| Dimensions | 163mm x 111mm |
| Temperature | 0ºC to +60ºC |
| System Features |
• Eb/No indicator, in 0.25dB steps over 2.5dB to 15dB range
• Persistent 64 x 64 pixel normalized constellation display
|
| Burst Mode Operation | SATCOM MODEM supports uncoded, convolutional, and TCM encoded (K=7, rate ½ FEC) data in burst mode. Burst frame format and timing details may be obtained from the user manual. |
BER Performance
Figure 1 - BER PERFORMANCE
Low-power receive only module
SATCOM MODEM test bed