[Elecraft] OT: modifying your amp for lower drive requirement

[Don Wilhelm]

  Fred and all,

That is something to be heeded.  The Elecraft example is that the K2 
key-clicks were not  a problem until the KPA100 was introduced.  The 
added gain of the KPA100 caused that problem to be amplified (along with 
the signal).  Elecraft responded with the Keying Waveshape Mod kit which 
corrected the situation.

73,
Don W3FPR

On 12/20/2010 7:57 PM, Fred Jensen wrote:
>
> See above if they are to be legally marketed.  And, that sounds pretty
> scary.  Many QRP radios have adequate spur suppression and phase noise
> ... at their normal low power outputs.  However, their spurs and phase
> noise get amplified along with the desired signal.  Raise the phase
> noise by 15 dB [or more if the amp is illegal], and you're probably
> putting a lot of trash into your neighbor ham's receiver.
>
> 73,
>