[Elecraft] Hum Coupling

[Ken Beals]

As is probably typical of magnetic coupling, when I run my K2 with a 
Henry 2K desk model set at right angles to the operating desk within 
arms reach I don't appear to have the problem.  At least no one 
complained during my 1700+ qsos during CQP.  In fact I had many 
compliments on the audio quality.  Or I'm just lucky.  I'll take it.

Ken K6MR

Earl W Cunningham wrote:

>Jim, KL7CC wrote:
>
>"So, maybe the problem [hum getting into the K2's PLL] could be worth
>another look, as in maybe there is  another way to solve it?  Could
>something be done to the K2 itself to make it immune to this problem?"
>==========
>Hum coupling from the K2's power supply xfmr is not much of a problem
>because separation of a couple of feet eliminates it.
>
>Hum coupling from a linear amp's hypersil HV xfmr is another story,
>however.  Six feet is not sufficient distance from my Alpha 76CA.  Ditto
>when my K2 was tried more than six feet from my friend's Alpha 99. 
>Thirty feet separation does clear up the problem, but that is
>unacceptable.
>
>I am a QRO operator who chases DX and works the contests, so I cannot use
>my K2 for this purpose because of the trashy signal it puts out when used
>with an amplifier.
>
>Elecraft is aware of the problem and was going to investigate further
>into it, but that was perhaps a year ago.  They were going to look into
>the possibility of fabricating a mu metal shield, but I have heard
>nothing back from them since.  If no fix becomes evident soon, I'm afraid
>my K2/100 will be up for sale.
>
>73, de Earl, K6SE
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