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LF: Re: Untuned loops

To: [email protected]
Subject: LF: Re: Untuned loops
From: "Dave Brown" <[email protected]>
Date: Tue, 15 Mar 2005 23:23:57 +1300
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Loop induced emf(volts) = 2*pi*(field strength in v/m)*(loop area in sq.
metres)* (loop turns)/wavelength.

Which for the single turn untuned circular loop case, can be
simplified to;

Loop induced emf (microvolts) = 16.449*freq(kHz)*loopdia(m)*loopdia(m)*field
strength(v/m)

Ref: Terman, "Radio Engineering", Section 11, Para 18.

Dave, ZL3FJ

----- Original Message ----- From: "Andy" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 15, 2005 10:01 PM
Subject: LF: Untuned loops


Can anyone recall this equation, I know it was mentioned on this reflector before...
What is the output voltage for an untuned small loop into an
arbitrarily high impedance? It is proportional to H, and presumably
F^2, and I seem to recall it is an absolute value, virtually
un-influenced by losses, conductor diameter etc. Therefore can be
used for accurate H field (and hence far field radiation) signal
strength measurements.
Andy  G4JNT



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