[RFI] RFI Digest, Vol 115, Issue 23.....identification or rfi

stbradford stbradford at insightbb.com
Sun Aug 26 12:25:15 EDT 2012

I have sent a few pictures to N1BUG directly. If 
anyone else would like me to see them, drop me a 
e-mail. The reflector won't accept photo's.

The April 2006 QST page 41 has the article on 
building the ultra sonic detector.

Smith Bradford
w9hak at insightbb.com


On 8/26/2012 10:32 AM, N1BUG wrote:
> I would like to see the photo of an ultrasonic 
> RFI locator with 19" dish. I would also like to 
> know where you got the dish. I have a 12" one 
> and have thought about trying to go larger. The 
> problem is finding a dish that is flat enough. 
> The available 40 kHz transducers have about 50 
> degree directivity. That requires a very flat 
> dish. I haven't been able to find any suitable 
> candidates.
> Paul
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