Topband: Magnetic Loops

[Andy Ikin]

Gary wrote on May 21.



> I've had a Wellbrooke loop for a few years at 20' on a TV rotator. It 
> nulls a single nearby QRN source NW at 300 deg true. EU is about 15-30 deg 
> from here. When 160 or 80 are open over the N Pole, it often helps me hear 
> the weak.
>
> It's less effective on multi-source QRN, but still helps at times if I 
> rotate the loop to null the loudest noise and max the received signals.
>
> No room for other receiving antennas, and the loop ignores legal limit 
> transmissions on a 120'x120' lot. What more can I ask?
>
> 73, Gary NL7Y





Gary,



Deploying the loop at ground level can sometimes reduce local QRN compared 
to mounting it high up where it can pick-up noise radiated from sources 
below.  Also it may be prudent to make sure you have mains filter on the 
rotator, receiver and Loop power supply. Preferable one with a Earth line 
choke, so it can have a separate ground connexion to the equipment isolated 
from the powerline Earth.





73



Andrew   G8LUG