Unfortunately, they do. Personally I dislike the term. For example:
A "A narrow roofing filter -- compatible with the communications bandwidth required -- will protect "downstream" stages. The K3's shift/width/hicut/locut controls automatically select and properly position the optimal roofing filter. You'll see the FL1-FL5 icons selected as you rotate these controls." http://elecraft.365791.n2.nabble.com/Re-roofing-filters-when-to-use-them-td446665.html#a446666 --- On Thu, 10/28/10, Ron D'Eau Claire <r...@cobi.biz> wrote: That's why the Elecraft doesn't call the first I.F. crystal filters "roofing filters". Unlike some receivers, the first I.F. crystal filters in the K3 are there for selectivity to isolate the desired signal. That is further enhanced in the second conversion with the variable DSP filter, but the crystal first I.F. filters are a key part of the selectivity equation. ______________________________________________________________ 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
