> Originally, IF shift was defined as moving one IF passband > within another IF passband, making the resulting passband the > intersection (not the union) of the two passbands.
Again, you are incorrect. Drake implemented a shift control long before any of the Japanese imports and its shift moved the entire passband without changing the width. Width was controlled separately, in discrete steps. Many of Yaesu's transceivers ... going back to the 1970's ... also had independent shift and width controls. Even today the FT-1000D, FT-1000MP, Mark V, FT-2000, FT-9000, etc. have width and shift controls that are independent and behave exactly like the K3 in Width/shift mode. It was only when Kenwood eliminated the third filter and failed to link the mixers that shift/width became effectively a high cut or low cut filter. Like so many other features of the radio, what you prefer depends on what you first used. For me, the current Elecraft design is the right way to do shift and width. Even better, I can select independent shift and width for CW and digital operation or high/low cut for SSB operation at the press of the encoder (or if I select 10 Hz steps for shift the behavior can change automatically as I change between voice and CW/data modes). 73, ... Joe, W4TV > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Al Lorona > Sent: Tuesday, December 29, 2009 6:18 PM > To: Elecraft Reflector > Subject: Re: [Elecraft] Filters for K3 > > > > It depends entirely on which brand of radio you were using > > and how the manufacturer implemented IF shift and/or width. > > Originally, IF shift was defined as moving one IF passband > within another IF passband, making the resulting passband the > intersection (not the union) of the two passbands. > > When you do that, you effectively reduce the width *and* the > center frequency of the IF passband... it has nothing to do > with manufacturers failing to make it work correctly. > > Take two pieces of paper and cut a square in each. Hold them > up to a window, and slide one square horizontally across the > other one, and note how the width *and* center of the opening > shifts left or right. This is what I mean when I say, "IF > shift". We might be talking about two different things. > > Regards, > > Al W6LX ______________________________________________________________ > 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 ______________________________________________________________ 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
