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On Fri, 10 Jun 2005 08:28:02 -0500, "Richard Fry"
wrote: An option would be to install a notch filter tuned for the local FM at the input to the problem receiver. It will attenuate that local signal (and others close to it in frequency, to some extent). A "5KFM" type notch filter from Microwave Filter Company may do the job, for about $25 as I recall. Here is a link: http://www.microwavefilter.com/ That's the perfect answer, but you may be able to achieve satisfactory results by - surprisingly - adding an attenuator (a 6db 300-ohm pad made from resistors would be a good start) in line with the antenna lead. RF overload characteristics are proportional to the square of the incoming signal, so the interference will be reduced more than the desired signals. Also, a three-element FM antenna won't be nearly as selective as a larger yagi of the type shown he http://www.starkelectronic.com/fm.htm Putting one of these on a rotator will normally run rings around any cable company unless you have interference from the new IBOC digital radio signals. Dave B. |
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