[CW] Learning hints

[Henry Mei'l's]

I'll see if I can dig up some my CW re-genertor diagrams from my 
file-archives.
HM

----- Original Message ----- 
From: "Stan Barr" <g0clv at dsl.pipex.com>
To: <djringjr at gmail.com>; "CW Reflector" <cw at mailman.qth.net>
Sent: Friday, January 15, 2010 4:33 PM
Subject: Re: [CW] Learning hints


> D.J.J. Ring, Jr. wrote:
>> Henry,
>>
>> I remember such circuits - I wish I could find a schematic for one now.
>>
>> As I remember the explanation of the one that I used very many years
>> ago, the person had used a very highly selective audio filter - he used
>> one tuned to the tone of aircraft beacon Morse modulation - that fed a
>> circuit that keyed a nice tone.
>>
>> The result on 80 meters during the summertime (when I used the unit) was
>> a nice clear tone with no background noise.
>>
>> I didn't use it long enough to find out if it had any quirks that made
>> it undesirable - but I certainly was impressed at the way it transformed
>> a noisy band.
>
> I built one some years ago using a NE567 phase-lock-loop chip driving
> an af oscillator.
> The main problem was false keying by noise spikes, but with a good
> pre-filter that wasn't too bad.
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