This receiver consists of an input network, amplifier IC7, FSK PLL detector IC8, and output amplifier/interface circuits Q2, Q3, IC3A, and IC3B, which include a 1488 Quad RS232 line driver for the carrier-current signal. The tuned amplifier IC7 amplifies this...
In this circuit, data at input C is amplified by IC2 and then fed to modulator IC1. IC1 generates two frequencies, depending on the values of C5, I10, R5, Rn, and R6. The frequency f1 is generated if pin 9...
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