Tom, Yes and No.
If you plan to use diversity reception, then the matched filters are necessary. If you do not plan diversity receive, then they are not important. There is a subtle point here that is not often mentioned. For wider filters, the offset is not as important as for narrow filters. If you have the 5 pole 2.7 kHz filters (for instance), one with an offset of +40 and another with an offset of +20, if you set the offset for both filters at +30, it will be quite usable - only a difference of 10 Hz at a bandwidth of 2700 Hz - it will not be noticable. But do not try the same thing with a filter width of 250 Hz - the results could be quite annoying. I cannot say where the dividing line should be between wide and narrow - a big part of it is in your ability to perceive slight differences. That is the facts as I know them - the choices are yours to make. The safe answer is YES, you need matched filters for diversity receive. 73, Don W3FPR On 2/8/2011 11:25 PM, tom kenville wrote: > I have a single receiver K3, with various filters. > > For adding RCVR#2, do I need to get a set of matched filter pairs to > complete that setup ? > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
