[Elecraft] Keying Bandwidth Mod

[Vic Rosenthal]

Earl W Cunningham wrote:

> My amp, an Alpha 76CA, has a hypersil transformer which produces an even
> larger field and I cannot get rid of the transmitted "noise" with the K2
> even six feet from the amp.  Moving the K2/100 to another room about 30
> feet from the amp "cured" the problem, but that answer is unacceptable.

Oh oh, I just fixed my clicks and now this to worry about!  When I was 
checking for clicks I noticed what appeared to be phase noise as well. 
I was running less than 5 watts into a dummy load, and was listening on 
my TS850s with antenna shorted and preamp off, giving me about an S9 
signal.  I don't know why I should have heard anything except the main 
signal from the K2, and I don't know whether the noise was generated in 
the 850, the K2, or somehow was a result of the way I did the test.

I have an Alpha 86 about 4 feet from the K2, and although it was off at 
the time of the test, now I'm wondering if it's safe to use it.  I 
wonder if replacing the bottom plate with a steel one (it wouldn't be 
too hard to make) would help?  Earl, does just turning on the amplifier 
in standby mode cause modulation of he signal?

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco