[Elecraft] magnetic fields and phase noise?

[Fraser Robertson]

Interesting Earl, the non exhaustive tests I've done indicate that it is not 
due to magnetic fields.  But if indeed that is the case, there must be a 
relatively easy, if perhaps not elegant, way of significantly improving 
this.

Has anyone else investigated this?

73 Fraser G4BJM

>From: Earl W Cunningham <k6se at juno.com>

>Over a year ago I noticed this problem, which occurs only when my K2 is
>driving my Alpha linear.  After extensive testing done by me to determine
>the cause of the problem, is was found to be caused by hum from the
>magnetic field of the linear amplifier's HV transformer getting into the
>PLL circuit of the K2.  In my case, 6 feet of separation between the K2
>and the linear was not enough to eliminate the problem, however with 30
>feet of separation (with the K2 and amp in separate rooms) did solve the
>problem.  This answer is unacceptable, of course.
>

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