Convolutional Encoder COM-1010 -> BPSK modulator COM-1002 -> 
BPSK demodulator COM-1001 -> Convolutional Decoder, K=7 COM1009 -> BER measurement COM-1005.


Test configuration example: 
- modulation 8.0 Mbit/s BPSK 
- error correction K=7 rate = 1/2
- throughput: 4 Mbit/s

The bit interleaver is placed in signal generator test mode, 
whereby a periodic 2047-bit sequence (PRBS-11) is being transmitted. 
The resulting data stream is BPSK modulated and BPSK demodulated. 
The end to end BER is measured using the COM-1005 module. The registers settings are as follows:

COM-1010: 02 08
COM-1002E: CD CC CC 00 00 00 FF 00 81 00
COM-1001E: 66 66 66 00 00 00 81 00
COM-1009: 82
COM-1005: 00

Proper operation can be verified as follows:

(a) using an oscilloscope probe:

COM-1001 TP1 is high, indicating demodulator carrier lock 

COM-1005 TP1 is high, indicating synchronization with the 2047-bit periodic test pattern 

COM-1005 TP3 is low, showing no bit error pulse.


(b) from the ComBlock control center check the BER (COM-1005 status).
It will show no bit errors (REG 1 through 4) and the synchronization bit (REG5 bit0) is high.
Depending on the demodulated phase ambiguity, the BER can be either 0 (no inverted bit) 
or 0x0F4240 (all bits inverted).