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Re: Filtering on Neons


> From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
> Phil writes....
> > 
> > I have just resurrected my small TC, and have used some RF filtering for the
> > first time. I am using some ferrite 'beads' for want of a better word. These
> > are about 30mm long, 20mm diameter with a 12mm hole through the centre. You
> > just thread them onto the wire, and they give a minimum of 8dB RF attenuation.
> > 
> Did it make any difference to behaviour/performance, and if so, what?


Hi Malcolm,

Well, I put two beads each on both lines out of the transformer secondary,
and a couple more on the feed to the high voltage transformer. I think the
performance of my coil was unaffected, by and large. However, I did find that
the addition of the ferrites shifted the tuning position of the coil - I had to
use an extra two turns of primary.

I have implemented a whole range of EMI measures, because I am running the thing
in the middle of our lab at work. There is a radio which sits about 6 feet away
from the coil, and the interference is minimal, all things considered. You know
how sensitive a radio receiver is!

Cheers
Phil