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K0CQ > SMART 21.03.04 14:31l 23 Lines 711 Bytes #999 (0) @ WW
BID : 14560_W0AK
Read: GUEST OE7FMI
Subj: Smart Squelch
Path: DB0FHN<DB0FOR<DB0SIF<DB0FSG<IN3TRX<IW3AQL<I4UKI<IK5CKL<IK1ZNW<IT9HZC<
IT9DLN<IT9LCP<HB9OK<WB0TAX<N8DA<WH6IO<KJ6EO<AE6JN<AE6JN<N0RVX<W0AK
Sent: 040321/0456Z @:W0AK.#CIA.IA.USA.NOAM #:14560 [Des Moines] $:14560_W0AK
From: K0CQ@W0AK.#CIA.IA.USA.NOAM
To : SMART@WW
There was an article in 73 Magazine, August 1982. My copy in my Smart Squelch
folder begins before page 44 and ends after page 48. There was a circuit board
offered and I bought a couple, assembled one a few years ago. It works quite
well on voice signals on both FM and SSB though it can be a little slow to
open since it depends on the syllabic envelope rate to recognize speech as
different from tones and noise. It does a decent job passing speech and
ignoring noise on a SSB receiver.
The circuit uses two quad op amps, a CMOS one shot, a transistor, a relay, and
a 7808 regulator chip.
73, Jerry, K0CQ @ W0AK.#CIA.IA.USA
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