An error-controlling device for HF channels

Practical biprocessor error-controling equipment (ECE) realised by the INTEL 8085 micro-processors has been demonstrated. Several shorter BCH codes for correction of 1 to 3 errors (codeword length is less or equal to 15) are chosen. The look-up table method both for the encoding and for the decoding is used. The ECE is intended for use on simplex, half and full duplex channels for the transmission rates of 50–9600 b/s, so both forward error correction and hybrid techniques are implemented. Variable modes of operation such as synchronous and asynchronous transmission with variable stop bit length, different character lengths with or without parity control, different transmission rates can be easily chosen by the switches on the front panel.