My 2 cents: For "rag chewing" the stock "wide" filter is fine.
In fact, I still use the stock SSB filter in both of my K3s and I am a pretty serious contester (nobody holds more current CQWW USA contest records than I do). Remember that a roofing filter is NOT what determines your "final IF bandwidth." It does, apparently, contribute "a little," but the DSP filtering is mostly what is doing that. So for me, the difference between how many signals are going to fall inside your passband when from 2.7 to 2.1 to 1.8 on SSB is, well, not much. If anyone in the USA has such a concern, for me, is appropriate only for contesting. Even when DXing, either your calling on "his" frequency or if split, well, hopefully he is asked for a split of more than just "up 1." Remember, this is SSB. Some will say that on 80/160, there are a very few number of DXing occasions where the narrower SSB filter can help. I won't argue that. I have to wonder out loud how many guys are "feeling" the DSP filter width impact when they go from their 2.7 to 2.1 to 1.8 on SSB versus how much of that is improvement in IMD reduction specs. For 99%, they probably are "feeling" the narrower DSP filter impact (which means the narrower roofing filter has essentially no impact at all). If the SSB band is packed with wall-to-wall very, very, very strong signals, then I'm betting that the roofing filter BW just won't matter for the vast majority of ops. Are there times when the narrower roofing filters are better? Probably a handful per contest. But for me, when contesting, I really don't want to deal with such a situation. I can probably have a better rate (if I'm running) by finding a better QRG to attempt to run (call CQ). It's mostly how much you want to "defend your frequency" versus how much you want to improve your QSO rate. YMMV. So to summarize...for my 2 cents, for "rag-chewing" the stock SSB filter is VFB. de Doug KR2Q ______________________________________________________________ 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
