> It was my understanding that the QAM-4 modulation was used for the > text transmission
Negative. Text and data can be anything from qam-4 to qam-64 FAC data (the callsign) is the only thing which is always qam-4 > and you needed to use at least QAM-16 for the > voice. Since the codecs used have 2400bps data rate, qam-16 is necessary. But if you find a decent 1200bps codec, data rate is lower, and qam-4 could be enough. > How many bps can you get through with QAM-4? See the list on the windrm spec page. http://www.qslnet.de/member/hb9tlk/drm_h.html > If LPC doesn't work at 1200 bps, > .... > And apparently it works OK at 1000 bps? I dont understand. Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
