On Thu, 22 Feb 2007 02:53:12 GMT, Owen Duffy wrote:

I am of the view that the three dimensional measurement is really a
technique suited to automated measurement of a large set of frequencies
with and instrument that has a single plane antenna that it cannot re-
orient, and whilst it addresses that issue, it is unnecessary
complication for a hand held loop that can be maximised.

Hi Owen,

It sounds like you want a Black Body Absorber.

You might want to take your lead from that if you are building
instrumentation (the purpose of your data reduction).

Presumably you would also want it to be isotropic in sensitivity. If
my speculations are correct, the simplest method would be caloric
based, but the trick would be to get it to occupy a volume of space
AND present 377 Ohms; but then how would you shade if from the sun
(another notable field presence that would innundate your detector);
or if done at night, how would you cope with the infinite heat sink in
nearly half the field of view? Most caloric methods employ a bridge
configuration that balances out these disturbances.

So, the simplest method is not very simple at all. Compare it to the
more difficult methods and you may wish for it after-all.

73's
Richard Clark, KB7QHC