The butterfly filters are tuned exactly to the tone frequency. When the cross pattern is vertical, it's spot on 2125Hz, horizontal is exactly 2295Hz. I changed the DATA Mode to AFSK using a single filter and that works the best. I found that the width control is optimized between 500 and 450 Hz. Less than 450, the non-coherent phase shifts are introduced, as you mentioned "is caused by filter ringing".
----- Jack WA9FVP Willco Electronics -- View this message in context: http://elecraft.365791.n2.nabble.com/RTTY-FILter-tp6756724p6756903.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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
