There is an awful lot of controversy over the G3LHZ theories on
loops......................
Andy G4JNT
-----Original Message-----
From: James Moritz [SMTP:[email protected]]
Sent: 2002/11/28 11:50
To: [email protected]
Subject: Re: LF: loop antenna
Dear Dave, Rik, LF Group,
At 06:36 28/11/2002 +0000, you wrote:
I have just done a couple of calculations on Rik's loop using
formulae from Mike Underhill G3LHZ (which are quoted on my web site).
Mike says that the maximum Q is in fact limited by the size of the
loop and has a limiting value of Q=500/D, where D is the diameter of
the loop (or for a rectangular loop the circumference divided by pi).
Feeding Rik's dimensions into this gives a maximum Q of 20, and it
will in practice be lower than this due to resistive losses
This calculation seems to be wildly divergent from the actual results of
less than 1 ohm , amounting to a Q of a few hundred, quoted for "Lowfer"
loops a little while back.
Cheers, Jim Moritz
73 de M0BMU
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