[UK-CONTEST] FT1kMP Key Click Reduction

[G3SJJ]

Yes, I agree, Clive. I have completed the Inrad mod, 2 C and 1R. The 
leading edge has only changed slightly but there is a very noticeable 
improvement in the trailing edge. Before there was a sharp corner 
whereas now it is much more rounded. I have taken pix of the waveform if 
anyone is interested.

73 Chris G3SJJ


Clive GM3POI wrote:
> 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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>
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