Cecil Moore wrote:
Ian White GM3SEK wrote:
Where the RF current meter really helps is if you decide you do have
an RFI problem. Then it lets you *see* how well you're managing to
fix it. Too much of RFI investigation work is like groping in the
dark. The RF current meter is like taking a blindfold off.

And the "RF current meter" doesn't have to be expensive or
complicated. A before/after relative current value may be
all one needs. I use a toroid with ten turns feeding a
1N34A curcuit and a DC voltmeter with very short leads. It
was "calibrated" using forward current into a 50 ohm load.

Simple measurements like this are covered in, "Baluns,
What They Do And How They Do It", by Roy, W7EL, in the
ARRL Antenna Compendium, Vol 1, article available at:

http://www.eznec.com/Amateur/Articles/

There are also full constructional details and examples on my site, at:
http://www.ifwtech.co.uk/g3sek/clip-on/clip-on.htm

--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek