An untuned loop should exhibit no resonances in its usable range. See
http://www.ets-lindgren.com/page/charts.cfm?i=6511 .
Also, A Novel Standard Loop Antenna for Antenna Calibration in the MF
and HF Bands, ieeexplore.ieee.org/iel5/10111/32404/01513478.pdf
Amateurs have used home-made loops to get pretty accurate measurements
of BPL emissions. http://vk1od.net/antenna/SmallUntunedSquareLoop/index.htm
One of his loops, 600mm square, has an AF flat within one dB from about
5.5 to 30 MHz (
http://vk1od.net/antenna/SmallUntunedSquareLoop/Loop600.pdf ).
Cortland
KA5S
On 12/6/2011 11:52 PM, John Woodgate wrote:
True for electric antennas, I think, but not for magnetic. Tuned loops
and ferrite-rod antennas can have high Q. CISPR 16 includes at least
one magnetic antenna, although it may well not be high Q.
-
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