Thanks Reg,

I think you are right. I need a variable phase and variable amplitude
system. The loop does a good job nulling out the noise, and "phasing out"
any residual noise wrt a sense wire should just about kill it off. Why dont
wellbrook or MFJ incorporate noise cancellers into their RX magnetic loops?
It would make sense.

Thanks Reg,

73s John.


"Reg Edwards" wrote in message
...
To use two or more very small loops in an array to produce a particular
radiating/receiving pattern, the physical spacings between them cannot be
less than the order 1/4 or 1/2 free-space wavelengths.

You may just as well use the well-known arrays of 1/2-wave dipoles.

This is because the radiation pattern of one small loop is identical to
that
of one small dipole except that is twice rotated in space by 90 degrees.

You can do no better than use a receiving magloop in conjunction with an
elevated, well-distanced noise-cancelling length of wire, the two being
combined at the receiver, the wire via a variable-phase and
variable-amplitude network. If the wire picks up a smaller noise signal
than
the main antenna it will be necessary to include an amplifier in the
phase-shifter.

Incidentally, the noise-cancelling wire + phase-shifter technique behaves
identically to rotating the wire direction in space, the null in the
combined receiving pattern also being rotated.

Of course, if the noise or interfering source is in the same direction as
the wanted signal you will get nowhere.
----
Reg, G4FGQ