[RFI] 160m ARDF / fox hunt antenna

Cortland Richmond ka5s at earthlink.net
Fri Nov 30 17:18:01 EST 2012


Well done!

I've done some sniffing like this on 80 meters, and you need to 
drastically reduce the receiver sensitivity to make sense of things when 
you get close in.  I used a 6 inch diameter untuned shielded loop made 
of coax and a T fitting on an AR8000 receiver and was able to walk along 
suspect blocks to find the dwellings and in some cases the exact room 
the RFI came from.

People who saw my car with its mag-mounted loop antenna, and me walking 
along sniffing, were dashing into their back yards to disconnect and 
hide illegal cable hookups they'd installed for a football game. Heh!


On 11/30/2012 1535, N1BUG wrote:
> Well, after a lovely bit of walking... about 6 miles of it... I've 
> narrowed the source of my new RFI down to a small ... The nulls are on 
> the loop are not consistent or predictable within that small area. 
> Attempting to create a plausible explanation for this, my feeble mind 
> invents: noise conducted into power, cable, or phone lines and 
> radiating from multiple points within a small area, or from all wires 
> belonging to a given system within that area.

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