Dale Saukerson wrote:
>Way back about 1978 or so....I built a couple of different circuits
>from either QST or 73.
>One was a simple audio filter tuned to 750 Hz. A LED would indicated
>a received tone equal to 750 hz.
>The other was an audio frequency generator set to 750 Hz. You would
>audibly beat that against a received tone. If the tones matched, you
>had only one tone to listen to. If they did not match, you would get
>both sum and diff and an audible warbling.
>I know I used them with my HW-101. Don't remember if I used them with
>my Corsair or '745.
>Any of you remember something like this? (I no longer have my
>They were probably OP-Amp circuits.
>Ex, soon again, N0AOZ
>TenTec mailing list
Hi Dale, try www.n0ss.net
I just built one, and it works great.
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