Bill, I think the 2.9Khz bandwidth measurements for that filter were taken at r.f. - for whatever reason, that bandwidth is not translating into a.f. - I've seen a.f. measurements done on about 5 samples of the 2.7Khz filter and they all run several hundred hertz narrower than the 2.9Khz figure.
73, Barry N1EU Bill W4ZV wrote: > > > > Stewart G3RXQ wrote: >> >> >> On USB the trace was substantially flat with the -3dB points at >> 430Hz and 2.77KHz. Not too bad and could probably be improved by >> moving the carrier offset frequency. >> >> > > One more point. The -3 dB bandwidth you are reporting is only 2.34 kHz on > a filter that is typically 2.9 kHz at the -6 dB points (mine and the one > measured by Elecraft below). That seems very strange also. > -- View this message in context: http://www.nabble.com/K3-SSB----Is-the-5-pole-filter-good-enough-tp15664900p15670025.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
