As someone who mainly operates during CW and RTTY contests, I draw a slightly different conclusion from Craig's and Jim's. In the absence of a true 270 Hz roofing filter, the existing "250 Hz" filter appears to be the best roofing filter option on offer for RTTY contest use. Therefore, while I agree with Ed's conclusion about these two filters, of the two the one that is unnecessary for me is the 400 Hz filter.
From amongst the existing choices, a 500/250 combination seems most effective for my situation. If I were more heavily into 160 CW as compared with RTTY, I might opt for a 400/200 combination instead. For a single roofing filter for CW/RTTY use, you might find a 400 to be the best single-filter compromise. Different solutions for different situations. 73, Rich VE3KI Craig AC0DS wrote: > I agree with you that there is no need for the 250 Hz 8 pole > option. Jim Brown K9YC wrote: > Indeed, there is no good > reason for the EXISTENCE of this particular 250 Hz filter, > primarily because it is NOT a 250Hz filter by any reasonable > measure. and Ed Muns W0YK wrote: > Accordingly, in their application as > roofing filters for the K3, I see no reason to have both the "250" and the > "400" in the same receiver. ______________________________________________________________ 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
