> > The 200hz and 250hz cw filters got an equal number of votes, > you left me alone on this ;-)
The filter curves on the Elecraft web site for the 250 Hz show the filter to be more than 350 Hz wide (at best) which does not provide a significant improvement over the 400 Hz filter. On the other hand, the 200 Hz filters regularly measure 190 to 210 Hz wide at -6dB and when plotted against the "250 Hz" filter are consistently "tighter" all the way down in spite of the larger shape factor. In my opinion, one is wasting money to have both the 400 Hz and 250 Hz filters ... use 500/200 or 400/200 or 1000/250 depending on your needs. I also don't know that I would use 250 or 200 Hz filter in the sub-receiver. If one has 500/200 in the main, I would order the 200 "matched" to the 500 Hz pair ... or I would simply accept the slight mismatch between 200 in the main and a 400 Hz 8-pole in the sub receiver. 73, ... Joe, W4TV > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of DM4iM > Sent: Monday, December 28, 2009 3:25 PM > To: [email protected] > Subject: Re: [Elecraft] Filters for K3 > > > Elecrafters, thanks for all the input. > I had many replies, personal mail or via the reflector. > > To sum it up: > > Matched filters are important for diversity. > > 8 votes for the 1.8khz, 4 for the 2.1 ssb filter for > contesting. Some use the 1.8khz ssb filter for cw, with the > dsp set to narrower bandwith. I think i will order one of > those, it makes sense to use it for cw-operation on a quiet > band and in ssb contests when things get rough. > > The 200hz and 250hz cw filters got an equal number of votes, > you left me alone on this ;-) > > The expense on 2 matched 5 pole or 2 8-pole filters is about > the same, so the criteria here is performance. > > May i call for a run-off? > > Thanks to all es HNY > > Martin > > -- > > 73, DM4iM > ______________________________________________________________ > 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 ______________________________________________________________ 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
