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Re: P3 - Wandering Baseline

Posted by Don Wilhelm-4 on Sep 23, 2011; 1:28am
URL: http://elecraft.85.s1.nabble.com/P3-Wandering-Baseline-tp6822403p6822590.html

Fred.

Check the coax between the K3 and the P3.  I think you will find the
problem solution there.

73,
Don W3FPR

On 9/22/2011 8:09 PM, Fred Jensen wrote:

> I thought I had this figured out and solved.  That I have not solved it
> does not surprise me, I'm fairly old and this *has* occurred once or
> twice before.
>
> Every now and then, generally more "then" than "now," the baseline on my
> P3 sort of wanders upwards.  Sometimes it's on the left, sometimes it is
> on the right, sometimes [not so often], it's the entire baseline.  It
> goes up maybe 1/3 of the screen [I usually have the waterfall turned
> off, I can't see it, long story], and it moves around vertically, not
> fast, but not slow either [being a retired engineer, I like to be precise].
>
> The band noise and signals seem to ignore this, they just appear on the
> elevated baseline as if they didn't know, which I suspect they don't.
> If, when this is happening, I place my hand on the top of the P3, the
> baseline returns to where it should be and stays there like a chastised
> 4 year old, with about the same attention span.
>
> I have grounded the P3 to my single point ground [a wide copper strap
> along the back of the shelf and "grounded" straight down to the ground],
> I've moved the rig power supply [FT-1030A] away, and I've shut the
> KPA500 [about 10 inches underneath] off with no change.
>
> I actually don't mind putting my hand on it to fix it, I've banged
> radios and moved stuff in magic ways for 50+ years to solve problems,
> but I'm just curious.  My P3 is powered from the K3.  Has anyone else
> seen this?  I haven't yet tried "hand on side of P3," tonight if the
> baseline wanders.
>
>
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