[RFI] Power Line Ultrasound Detector

[Cortland Richmond]

I noticed the similarity on the Web page between the smaller listening dish
and the ultrasonic listener. Could easily have been the wrong item -- or
built to the wrong plan.

Cortland

Bill NY9H wrote
> [Original Message]
> It did however , as the ad suggests , hear the babbling brook behind my
house.
> ( when standing next to it)...
>
> maybe the one we got as not working properly,,,
> I think it was just an  amp on an ultrasonic detector....