On 9/25/2012 4:22 PM, Mike Harris wrote: > 2700Hz and 500Hz in both main and sub RX here. Nothing else, not felt > the need, however, an FM filter could be added in one RX one day.
The only reason to agonize over roofing filters is, "How many strong stations do you have near you?" I have the two "stock" filters with my K3, no second RX, I have two very strong contesters within 2 KM of me, I don't have any problems. I can get within a KHz or so of either and work the station I'm calling. I don't know if my close neighbors like that, but I know them well and they haven't complained. :-) > > There have been measurements which show that the 5-pole filters have > superior group delay characteristics when compared to the 8-pole. Might be a problem for some digital modes [not CW, the "First Digital Mode"], but some of the more esoteric modes could be affected. 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 Weekend after next - www.cqp.org ______________________________________________________________ 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
