[RFI] FW: Topband: Exciting noise sources (Tim Duffy K3LR)

[Phil Duff]

On 3/28/2011 15:52, Frank Haas KB4T wrote:
> The majority of real power line interference sources can be heard at VHF and
> low UHF frequencies as you approach the source (within a 1/4 mile
> typically.)

What about ultrasonic receivers/systems such as the one described by 
W1TRC in April 2006 QST to zero in on arcing on a pole?

I've not seen much if any mention of the use of ultrasonic receivers 
since the QST article was published.

73 Phil NA4M

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Phil Duff
Georgetown, Texas
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