I built one and never worried about the scale. I had a knob to change the
sensitivity. At a certain sensitivity, I would expect all the wires/ cables to
have some RF.
I only used it if I have a problem. I used it to see where the best placement
of the ferrite was. Sometimes where you think the placement is best, isn't.
You can also see the difference that multiple wraps around a ferrite makes and
what is optimal.
You can also see what wire/ cable has the most RF on it and start working there.
This can all be done with a relative scale reading on the meter, it doesn't
have to be calibrated.
I think I used a 10 turn 100 Ohm Pot on my meter to adjust the relative meter
Just because there is RF on a wire don't mean there is a problem.
--- On Wed, 2/2/11, Martin Sole <firstname.lastname@example.org> wrote:
> From: Martin Sole <email@example.com>
> Subject: [RFI] Clamp on RF meter
> To: firstname.lastname@example.org
> Date: Wednesday, February 2, 2011, 2:16 AM
> I just built a clamp on RF current
> meter. Worky worky but I'm thinking about
> relative levels and how sensitive to make it. I have to
> think that in a high
> power ham station it might be reasonable to expect some
> current to flow in
> various wires in and on a property but what is reasonable?
> Ideally thinking
> that I can set mid-scale to be some sort of good/bad
> threshold or is it
> likely to be too subjective?
> Martin, HS0ZED
> RFI mailing list
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