Looks like the FSK/DATA mode filter may be ringing - eyeballing the filter envelope looks like it has some dips. A bit more bandwidth might help - and the other time I've seen this is when there's a tuning error, such that the two bandpass filters are not exactly centered on the mark/space frequencies. That observation is not with respect to the K3, but relates to observations I made back in the days of Model 15 page printers with analog filter demodulators.
Jack K8ZOA On 9/3/2011 11:23 AM, wa9fvp wrote: > Here's are the actual Butterfly filter outputs using an Agilent DSOX3024 > digital storage scope connected to the mark/space (or X/Y) outputs on the > M8000. The first image is the actual DSOX3024 screen shot with the K3 in > USB mode on 20 meters, copying RTTY 45/170. The second photo is the same > setup except the K3 is in FSK/DATA mode. > > http://elecraft.365791.n2.nabble.com/file/n6756776/rtty_usb_mode.bmp > http://elecraft.365791.n2.nabble.com/file/n6756776/rtty_data_mode1.bmp > > > ----- > Jack WA9FVP > Willco Electronics > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/RTTY-FILter-tp6756724p6756776.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 > ______________________________________________________________ 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
