[UK-CONTEST] FT1kMP Key Click Reduction

[Clive GM3POI]

Chris,
The more important check you can make are the corners of the waveform. You 
do not want any sharp corners, whilst rise and fall times effect the click 
pattern you should be more interested in the roundness of the waveform 
corners.
73 Clive GM3POI
----- Original Message ----- 
From: "G3SJJ" <g3sjj at btinternet.com>
To: "UK Contest Reflector" <uk-contest at contesting.com>
Sent: Saturday, March 03, 2007 11:52 AM
Subject: [UK-CONTEST] FT1kMP Key Click Reduction


>I am in the process of dong the Inrad key click mod. Just about to
> solder in the 0.1uF on to the RF board. Before I do that I was
> wondering if any one had any views about which components do what?
>
> A check on my scope revealed that both positive and negative going
> leading edges were virtually text-book waveform, with about 6-8 mS
> rise-time. My scope hasn't got storage facility. The trailing edge is
> not so good with probably around 1-2 mS which will produce some clix,
> (though with one comment in 10 years it can't be that noticeable!!)
> Obviously I need to tame the trailing edge, but ideally I don't want to
> lengthen the leading edge and make it too soft a sound.
>
> Any thoughts.  Chris G3SJJ
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