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RE: LF: loop antenna

To: [email protected]
Subject: RE: LF: loop antenna
From: "Andy talbot" <[email protected]>
Date: Thu, 28 Nov 2002 13:16:41 -0000
Importance: high
Reply-to: [email protected]
Sender: <[email protected]>
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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