[RFI] DFing an HF RFI source

[Richard (Rick) Karlquist]

I had pretty good luck with a receiving loop
(the so-called "shielded" loop made of coax).
Orient for a null and the RFI is broadside to
the loop.  

Rick N6RK

> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com]On
> Behalf Of Kelly Johnson
> Sent: Monday, October 02, 2006 4:57 PM
> To: rfi at contesting.com
> Subject: [RFI] DFing an HF RFI source
> 
> 
> I have an RFI source in my neighborhood that I'd like to track down,
> but could use some advice.
> 
> The noise source sounds like a "click" or small burst of energy at
> approximately 1Hz.  In other words, I hear a burst of RFI a little
> faster than once per second.  It seems to be relatively narrow band.
> I don't hear it below 17 meters.  It is strongest on 17 meters, but I
> can sometimes hear it on 15 meters and maybe even 10.  I've never
> heard it above that.  I have DF'd the general direction using my tower
> mounted HF yagi and the RFI peaks at about S7 or S8 on 17 meters which
> is fairly strong, however I can't hear it when I walk the neighborhood
> in that direction with my FT-817 and a whip.  I obviously can't carry
> a 17 meter yagi around the neighborhood.  What other decent antenna
> can I use to DF something doesn't appear to be broadband enough reach
> into the VHF region?
> 
> FYI - The strength of this noise source varies from day-to-day and
> some days I don't hear it at all, but it's there most of the time.
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