[Elecraft] K2 Key Clicks

Fri Nov 28 17:43:01 2003

Not so much the total transition time, but the shape of the beginning of the transition. The beginning of the transition is sharp, the ending soft. Both need to be rounded, which is what they are fixing in the upcoming mod.

73, Guy
K2AV

> 
> From: Larry East <[email protected]>
> Date: 2003/11/28 Fri PM 04:22:31 EST
> To: <[email protected]>
> Subject: [Elecraft] K2 Key Clicks
> 
> After I built my K2 a couple of years ago, I received a report of key 
> clicks. Looking at the output on a 'scope, I saw that the keyed envelope 
> had a very fast rise time (<0.5 ms) which was causing the clicks. With help 
> from Gary and Wayne, I finally tracked the problem to an incorrect value of 
> C125 on the RF board; I had used a 2.2uF cap instead of 22uF! When I 
> replaced the cap with one of the correct value, no more key click reports! 
> As I recall, the envelope rise and fall times of my K2 are in the 3-5 ms 
> range, which most folks consider about right. I wonder what sort of rise 
> and fall times the folks who have key click problems are seeing on their rigs?
> 
> 72/73,
> Larry, W1HUE/7
> Tucson, AZ
> 
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