On the other end of the spectrum: If the going is really tough, you might consider our 200 Hz, 5-pole filter. It's a favorite of CW and data-mode operators who routinely have to dig for weak ones between monster signals in CW and data modes.
73, Wayne N6KR On Feb 8, 2011, at 11:07 AM, Scott Ellington wrote: > QRM levels are generally much lower outside EU or NA. Years ago, I > did a CW contest from ZL with a TS-50 and a single 500 Hz filter. > That would have been woefully inadequate in NA, but it was fine > there. So, the question I would ask is whether anyone in a non-EU > or NA QTH has compared the K3 400 Hz filter with narrower DSP with > the 250 Hz filter. Surely, the 400 Hz fliter +DSP would be far > superior to that old TS-50, so I would expect it to be fine. Note > that the K3 "250 Hz" filter is really about 370 Hz wide, compared to > 435 for the "400 Hz" one, so the difference isn't that great, anyway. > > Perhaps Jorge can check this out in the next contest: Set the "I" > filter to 400 Hz, and the "II" filter to 250 Hz, both with the 400 > Hz xtal filter. I'd be interested in the results. > > 73, > > Scott K9MA > > > > On Feb 8, 2011, at 11:49 AM, Jorge Diez - CX6VM wrote: > >> Hello, >> >> >> >> I have both KFL3A-400 (400 Hz 8-pole) and KFL3A-1.8K (1.8 kHz 8- >> pole) >> filters in my K3. >> >> >> >> If I add a KFL3A-250 (250 Hz 8-pole) filter I will notice it better >> to use >> in contests? Or with the 400Hz is enough? Notice I am not in USA >> or EU >> with strong stations near me, I don´t have the QRM this big >> populations >> have, trying to reduce the splatters. >> >> >> >> 73, >> >> Jorge >> >> CX6VM/CW5W >> >> k3 #4077 > > Scott Ellington > Madison, Wisconsin > USA > > > > ______________________________________________________________ > 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
