LF: Sensing loop

["John RABSON" <john.rabson@wanadoo.fr>]

I have a 2 metre square 8 turn loop which is series resonant on 138kHz.  To 
calibrate this I am thinking of adding a single turn loop which can be fed with 
a known current and therefore produce a known magnetic field.  Should this turn 
be within the main winding or should it be a much smaller loop at the centre?

John
F5VLF