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
