I use the 500 hz roofer set to cut in when the DSP gets around 750 hz. That eliminates a lot of the crud that comes through. That crud is the "growling" noise you hear in background of the other rigs when you tighten down their DSP.
Buck k4ia k3 #101 In a message dated 2/6/2009 8:38:10 A.M. Eastern Standard Time, btipp...@alum.mit.edu writes: Julius Fazekas n2wn wrote: > > In my CW opinion, I would say you don't need a filter for FD use. While > popular, it doesn't hold a candle to the harsh conditions during a 160M or > major DX contest, such as CQ WW on 20M. > Unless your antennas or operating environment can present signals approximately S9+30 to the K3's front end, there is NO need for ANY roofing filters other than the stock 2.7k. Also remember that 2.7k is already about twice as narrow as the narrowest roofing filters in the FT-1000 family *with* Inrad roofing filters, FT2000, FT9000, IC-7700, IC-7800, etc. Yes Icom and Yaesu claim to have "3k roofing filters" but they have been actually been measured at ~5k by Sherwood and others. Advertising hype rules at these companies (as usual). 73, Bill **************Great Deals on Dell Laptops. Starting at $499. (http://pr.atwola.com/promoclk/100000075x1217883258x1201191827/aol?redir=http://ad.doubleclick. net/clk;211531132;33070124;e) ______________________________________________________________ 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
