The passband shape is that of an inverted "V" with a sharp tip. While this can be remarkably useless for tuning around, the regular passband shapes being better for that, once a real weakie is discovered, tuning the APF to it creates an immediate signal to noise improvement. It is so narrow though that one can tune past a weak signal and not hear it.
On Sat, Nov 6, 2010 at 11:51 AM, Robert Morris <[email protected]> wrote: > Why is it that the APF is more effective than a narrow ordinary > DSP filter? > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
