[RFI] Portable DFing at HF

[Jim Brown]

What kind of noise is it, Kelly? Impulse noise from a power system, or 
electronically generated? In general, impulse noise is best DFed at the 
highest frequency where you can hear it, often up to 440 MHz. A compact 
440 Yagi would be a great antenna, tuning the RX to the 440 band 
(because that's where the antenna has controlled directivity).

If the noise is electronically generated, we must chase it on the bands 
where we hear it, usually strongest at HF, where loops are usually our 
best tool.

You might find this useful. http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On Thu,8/11/2016 1:57 PM, Kelly Johnson wrote:
> I am trying to locate a new source of RFI in my neighborhood.  I can get a
> decent direction in it from my yagi, but would like to DF it from another
> direction to pinpoint the source.  I don't know if I can DF it at VHF or
> UHF, but the noise is very clear on 20m.  Any ideas about a good portable
> DF antenna for 20m?
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