I don't know if you're only interested in homebrewing the zero-beat, Dale.
If you're interested in a kit, Chuck Olson, WB9KZY, has a neat little
circuit he calls Son of Zerobeat. Stealing his description, "Son of Zerobeat
has 7 LEDs which graphically indicate the frequency of a received CW audio
tone. Adjust your transceiver's frequency until the center green LED lights
and you are within +/- 10 Hz of zero beat with the transmitting station."
It was a fun kit to build and only cost me 28 bucks! He's got a manual
available online, too.
You can find Son of Zerobeat at:
I've built a couple of the kits Chuck offers and I'm always more than
pleased with the components and the results.
Hope this helps.
San Diego, CA
Subject: Re: [TenTec] Zero beating aids?
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
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