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A company in FL - well, they might have been blown away by now - called
something like Pizio Technologies makes VHF bandpass filters from "crystal" elements. Such filters are capable of rejecting adjacent channels in the 150 MHz range and are needed in some cities if you have to put a receiver downtown. As Dale points out, it takes a serious filter indeed to perform what you wish such a filter to perform. On the other hand, I have deliberately tuned some higher end FM broadcast receivers to a weak adjacent station in the presence of a fairly strong station to find a bit better than mediocre performance. Some receivers have much better filtering than other receivers. So, as another summery: rotate antenna for best SNR; get a receiver with better filtering; and consider a special-made crystal filter if you still have a problem. 73 Mac N8TT -- J. Mc Laughlin; Michigan U.S.A. Home: "Dale Parfitt" wrote in message news:_X90d.8722$Va5.8116@trnddc01... Unfortunately, you will find that the -3dB BW of a single stub is in the neighborhood of 5% or 5MHz at your frequency of interest. The discrimination between your desired and undsired channels will be negligible. We manufacture a line of small multiple cavity symmetrical and asymmetrical notch filters- getting under 0.5% BW with small topology filters is nearly impossible at VHF. Dale W4OP |
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