And just for the record. If you are going to optimize for bandpass shape then you are going to have non constant group delay.
If you add more crystals you can have both and the filters would be more expensive. It's a compromise and we demand this compromise. A phase linear filter looks bloody awful in terms of bandpass shape. No sharp sides. But these days the DSP can provide some of the attenuation so perhaps a compromise can be made. Which is why I like the 2.7 KHz 5 pole filter. -- View this message in context: http://elecraft.365791.n2.nabble.com/What-crystal-filters-for-the-K3-are-linear-phase-delay-constant-group-delay-tp7587633p7587777.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
