SPECIFICATIONS (User Manual)
|
| SYSTEM |
| 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/ Quaternery/ 8PSK-TCM/ 16QAM-TCM/R-S
(Test mode also supports 16QAM-TCM-manual ambiguity decoding) |
| Scrambling |
CCITT V.35 |
| Data interface |
RS-449 |
| IF
frequency |
70
MHz (fixed) |
| Modem performance |
As per figure 1 |
| Power supply |
+5
V DC, 1.1A | |
MODULATOR |
| Transmit power |
-9 dBm (BPSK, QPSK and 8-PSK)
-6.7 dBm (16-QAM) |
| Spectral shaping
|
BPSK and 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
http://www.signion.com/bbps.pdf
http://www.signion.com/pulse.pdf
|
| Modulator timing |
Internal |
| Output impedance |
50
ohms | |
DEMODULATOR |
| Receive level |
-15
dBm to -5 dBm |
| Acquisition type |
Continuous/ Burst |
Carrier acquisition range, time
(at 1024000 baud rate) |
Continuous mode (BPSK) : ±80 kHz, < 75 ms
Continuous mode (QPSK) : ±40 kHz, < 150 ms
Continuous mode (8-PSK) : ±15 kHz, < 1.4 s
Continuous mode (16-QAM) : ±5 kHz
Burst mode (QPSK) : ±50 kHz, < 78.125 µs
Burst mode (coded QPSK) : ±16kHz, < 140.625 µs
Burst mode (8-PSK) : ± 8kHz, < 140.625 µs
Burst mode (16-QAM) : ± 4kHz, < 203.125 µs
|
| Continuous mode tracking (in Hz/sec) |
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 | |
MECHANICAL/ ENVIRONMENTAL |
| Dimensions |
163mm x 111mm |
| Temperature |
0ºC to +60ºC | |
FEATURES |
| Eb/No indicator, in 0.25dB steps over 2.5dB to 15dB range |
| Persistent 64 x 64 pixel normalized constellation display |
|
BURST MODE |
| 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 user manual |
|
BER PERFORMANCE |
Figure 1 - BER PERFORMANCE |
