> Further to Joe's suggestion: I've heard of a strong local signal being > rectified in rusty guttering giving problems to a beam in just one > direction. Took years to find that one.
Reminds me of something which happened many years ago here in Southern Germany. The interference monitoring and abatement service (at the time they were part of the German Post Office) received several complaints about TVI. The nearest ham was about 2km distant and when they checked his transmitter, the signal was clean. When they measured at the TV receiver there was a large harmonic on the same frequency as one of the TV stations. It turned out that one of the ham's neighbours had a narrow band, high gain television reception Yagi pointing towards the 2km distant TV. It turned out that there was some oxidation at the feed point of the Yagi, which acted as a diode. As you can imagine, this is the very short version of this true story. vy 73 de toby, DD5FZ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
