Squelch detecting circuit with squelch start determining means

Details Squelch detecting circuit with squelch start determining means Squelch detecting circuit with squelch start determining means

H - Electricity

04

B

325/121

H04B 1/10 (2006.01) H03G 3/34 (2006.01)

Patent

CA 1248593

Abstract A squelch detecting circuit comprises a narrow bandpass filter (16) for obtaining, as a filtered signal, a desired IF carrier frequency signal. The filtered signal is envelope-detected at a detector (17) and the detected signal is compare with a predetermined squelch level at A voltage comparator (21). The voltage comparator produces a first signal when the detected signal is below tho a squelch level and produces a second signal when tho detected signal is above the squelch level. A squelch start determining circuit (22) produces A squelch alarm signal After the first signal is continued for a predetermined time period, and the squelch alarm signal is maintained until the second signal is inputted to the squelch start determining circuit (22), So that the transmitter and receiver characteristic test using the carrier frequency sweeping can be performed without any squelch alarm signal produced.

513070

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