[Elecraft] Capicator Size for filtering across battery power

[Eric Sluder]

I typically use a high uF cap that is rated at 70-80 volts DC.  My current
installation utilizes a 44,000 uF cap and all is quiet for my DC power
needs when running off of the battery fed by a charger.

73,
Eric
W9WLW
On Oct 6, 2012 5:36 PM, <goldtr8 at charter.net> wrote:

>
> Gents,
>
> My setup uses four ()4 12v batteries in parallel for powering my K3 and
> SGC powercube amp that I float with a battery maintainer.
>
> I believe that I have an RF problem with the power setup.   I have put
> chokes in the power leads to the equipment but at certain times I can
> hear the ferrites buzzing with either the digital code being sent of
> matching my voice with SSB.   The chokes are clamp on types.  I am not
> observing any RF problems or reported problems on the air.  But I think
> that something is not right as of yet so I want to go after it to make
> my shack even better.
>
> It has been suggested to me by a ham on the air that batteries just pass
> this thru as they have no filtering capability.   His suggestion is to
> but a bit CAP across the batteries to kill this phenomenon.
>
> So my question as I am not an EE by education is how would I properly
> pick a CAP size and would different materials that CAPS are made out of
> make any difference.
>
> It would be easy to go out and get a large CAP like used on car stereo
> systems but I want to have a better shot of fixing it right than just
> hacking away.
>
> As always thanks in advance for your help.
>
> ~73
> Don
> KD8NNU
> FH#4107
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