[RFI] RFI location finders

qrv at kd4e.com qrv at kd4e.com
Mon May 26 18:37:36 EDT 2014

I have a little radio that I bought from a Ham in England.

Model: UT-DM9010 10 Bands AM/FM/SW

Amazingly sensitive & sorta bi-directional on AM & SW
using the internal ferrite-bar antenna.

It worked to trace the mostly-HF RFI from the local power poles.

It may have been possible to track using VHF or UHF but as noted
that requires AM on those bands & I had this little radio handy.
(I never noticed nor tried to detect VHF/UHF noise.)

I suppose the VHF weather band on a cheap Chinese HT is AM as is,
I believe, the Aircraft band - but nothing AM on 440 (unless
there is a mod).

BTW: This is one of those little radios that Hams converted for
use as frequency counters & other gadgets - I think they stopped
making them several years ago.

David KD4E

> I'll repeat my recommendation of a VHF/UHF radio that has an AM
> detector. I have two -- a Kenwood TH-F6A talkie, and a Kenwood TM-V71A
> (I think that's the model number) mobile rig.
> I drive around monitoring around 160 MHz, then when it gets really loud,
> switch to a frequency in the 450-525 MHz to nail the source when I'm close.
> This only works for arcing (mostly power lines), which is extremely
> broad band. It does NOT work for electronically generated trash.
> Also, remember that you can hold a talkie close against your chest to
> form a half-space antenna that will help with DFing.  I once won our
> Chicago club's annual foxhunt using nothing more than a TH-F6A with a
> duckie.
> 73, Jim K9YC
>> On 26 May 2014 at 13:01, W0MU Mike Fatchett wrote:
>>> >http://www.nationalrf.com/type_hfdf_vector.htm.
>>> >
>>> >This is one option.  What are the others?
>>> >
>>> >I recall reading about a dish type that is more directional.


David Colburn, KD4E - Nevils, Georgia USA

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