System for locally testing a modem employing frequency shift key

Details System for locally testing a modem employing frequency shift key System for locally testing a modem employing frequency shift key

1981-06-23

1983-07-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 22, 375 10, H04B 346

Patent

active

043935087

ABSTRACT:
A test system is used to test a modem whose modulator is constituted by a multivibrator which during normal operation produces two frequencies f.sub.1, f.sub.2 in response to the data signal and which is connected to a transmission filter. In response to a test control signal, the multivibrator is modified to supply two test frequencies f'.sub.1 =nf.sub.1, f'.sub.2 =nf.sub.2, n being substantially equal to the ratio F.sub.o /f.sub.o, F.sub.o being the average value of the frequencies received by the modem during normal operation, f.sub.o being the average value of the frequencies f.sub.1, f.sub.2 ; at the same time the transmission filter is modified to transmit the two frequencies f'.sub.1, f'.sub.2 in response to the test control signal.

REFERENCES:
patent: 3655915 (1972-04-01), Liberman et al.
patent: 3719779 (1973-03-01), Wilson
patent: 3793486 (1974-02-01), Koziol
patent: 4323862 (1982-04-01), Boudault et al.

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