[Elecraft] K2 SSB audio problem(an update)

[George Winship, NC5G]

Don,

Yes, installed the updated shield and the KPA100 upgrade mods in 2010. A to
B mods on the K2 were done in 2003. Also, did the SSB mod to broaden the
bandwidth to 2.5 KHZ back then also. 

73,

George, NC5G 



George,

Do you have the updated shield on that KPA100?  Shield over the speaker 
magnet and a narrow notch at the SO-239 jack and solder lugs to directly 
connect the SO-239 jack to the outer surface of the shield.  If you have 
all those, there should be no change in the K2 behavior when installing 
the KPA100.

73,
Don W3FPR

On 10/28/2012 9:25 PM, George Winship, NC5G wrote:
> After some extensive on the air testing with my Son, this is what we have
> found.
> One by one I eliminated pieces of equipment starting with the KPA500, then
> the KAT100, followed
> by removing the KPA100 from the K2, then changing power supplies, hooking
> the basic K2 to the 2.5A ps
> that I power the KX3 with. This ps is about 3ft. from the K2 on the floor,
> under the desk. In this configuration, the audio was clean. Even though
> not
> connected, I turned the KPA500 on(which is about 4 inches from the right
> side of the K2) and this introduced some small artifacts which would
> suggest
> that the VCO mod would be worthwhile.
>
> Following this, I reinstalled the KPA100. With the small PS still
> connected(the K2 does not recognize the KPA100), the bad audio problems
> returned. Disconnecting the small PS from the K2, and connecting the
> Astron
> 35m(which is about 2ft. from the left side of the K2) to the KPA100, but
> keeping power below 10 watts to keep the KPA100 off the results were no
> different. Turning the power up to turn the KPA100 on, the results were no
> different. Power output through an external watt meter closely follows the
> power selected.




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