[Elecraft] PTT stuck? Error?

[Don Wilhelm]

  Adrian,

While that is a "fix", the actual problem is the level of RF in the shack.
If it creates problems such as that, it makes me wonder what other 
problems may be created as well.
The antenna balance (and/or use of effective baluns), the proximity of 
the antenna to the shack, and rf on the ground conductor will play a 
part in the final result.  It may be that one must resort to connecting 
a 1/4 wavelength wire to the station ground for each band of interest.  
While that is not the most desirable solution, it can work for those 
situations where nothing else works.

The basic problem actually exists at lower power, but does not "do bad 
things" until the power is increased.

73,
Don W3FPR

On 11/25/2010 2:49 PM, Adrian wrote:
> I have seen this issue caused by rf induction (when using an amp) on the
> Kusb cable (If you have pc  connected).
> A ferrite snap on with the cable wound through the snap-on ferrite as
> many times as will stop this issue.
> I also fitted a Coilcraft RS-232 filter between the K3 and the cable
> DB-9 plug for noise proofing as well.
>
> Adrian ... vk4tux
>