Paul Christensen wrote: >> The 'RC rise/decay' wave shape that was in the handbooks for many years >> is actually a *bad* shape because it has a very sharp corner on key-up. > >Ian, *bad* may be a bit too harsh. The League's optimized envelope was >described during a time when only simple R/C values were used to >develop a keyed envelope. I'm not sure how one would have produced an >economical Blackman-Harris or raised cosine function until say...the >early to mid '90s. How would you have done it? Probably the only >solution at the time was to set leading and trailing edges produced by >the R/C network so soft that they're painful to copy. > My criticism was that because R/C shaping was judged to be the only available technology, it was wrongly promoted as being the optimum that designers should aim for. Given better information, I believe designers could have produced analog circuits to approximate the true optimum shape... but that didn't happen.
-- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ______________________________________________________________ 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
