I wasn't picking on Pawel at all...I just used MT63 as an example. My Point was that if you applied a 300 baud/symbol rate to one carrier/tone-tone/carrier and trasnmitted it with one transmitter and had 64 trasnmitters running in the same band or running 64 tones with 300 baud/symbol rate through one transmitter, there is no difference to the received signals. Since there is NO limit on the number of transmitters you can run, then why would you not let good engineering practice prevail and run those 64 tone/carriers through one transmitter.
I was't considering bandwidth...just trying to make the point that 64 transmitters or one transmitter sending the mode made no difference on the receive end. Is that clearer? Walt/K5YFW -----Original Message----- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] Sent: Friday, September 01, 2006 11:11 AM To: digitalradio@yahoogroups.com Subject: RE: [digitalradio] USA; Baud Limit = 300 Symbols Per Second (HF Digital Data) >So what would be the difference if I transmitted 64 tones/carriers each >modulated at 300 baud but transmitted them through one transmitter or 64 >tones/carriers through 64 transmitters into one antenna? Walt, From a regulatory standpoint I don't think there is a problem. I think that Pawel Jalocha SP9VRC was concerned about occupying too large amount of bandwidth. Most U.S. Hams consider the RTTY/Data subbands to be narrow band . This is evident in the regulations. When the verbiage of 97.307(f)(3) was written (1977), there was only CW and FSK in the RTTY/Data Subbands,. In the Phone/Image subbands there were only analog emissions and they were AM, SSB and SSTV. The FCC tried to segregate the subbands by bandwidth, but there were some problems with AM and Fast Scan TV. Those groups mounted a campaign to stop the bandwidth effort at that time. The compromise was to keep the narrow/wide segregation, but do it without enumerating bandwidths. This is what we have today. Specifying a maximum Baud rate does not necessarily specify a maximum bandwidth. 73, Mark N5RFX 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 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/ <*> 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/
