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Bandpass Filter for Bell103A Originator Modem (MC1458)

2015-01-17 20:51  
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Bell103A modem standard specify that the originator (the caller) uses 1070Hz and 1270Hz frequency shift keying for transmission, and listen for 2025/2225Hz FSK transmitted by the answering modem. This bandpass circuit filter out any frequency beyond 2025-2250 Hz to improve originator’s decoding of the received FSK signal. Here is the schematic diagram of the circuit:

Bandpass Originate Filter circuit schematic diagram

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