Ah ha...well Bonnie I see that I am not the only one who is looking at the overall picture of band usage.
Here is an example of what I saw in the military... SSB voice took 10 minutes to pass a 100 word message between really seasoned radio operators on an HF channel typical of most Q4-5 amateur radio QSOs. When they went to 300 baud text data, they send the same message in 2 or 3 minutes and sometimes 3 or 4 when they had to repeat the message...this was again with Q4-5 signals. The modem was not much more than a Bell 103 modem. With a MIL-STD-188-110 16 tone modem at 2400 baud, the message took 1 or 2 minutes and only every 5-6 messages was a it necessary to repeat a message. The band/channel usage went from 1=10 to 9 0r 9=10...almost a ten fold increase in band/channel usage. Today those same units are using 9600 BPS data and sending one page of text in a couple of minutes or sometimes "booking" messages and sending 20-50 messages at one time. The higher the throughput and mode robust the mode, the less channel usage there is going to be at a fixed amount of data. For testing of any text mode or DV mode, a standard text should be adopted. Walt/K5YFW -----Original Message----- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of expeditionradio Sent: Saturday, October 21, 2006 9:08 PM To: digitalradio@yahoogroups.com Subject: [digitalradio] 3kHz or 500Hz Re: Updates on effect of FCC R&O There's another way to look at spectrum use. It is better to use a 3kHz bandwith for 10 minutes than to use a 500Hz bandwidth for 1 hour to pass the same traffic. On HF, with short propagation openings, it is better to be able to quickly send the message. Approximately 3kHz is the defacto worldwide bandwidth standard for HF communication transceivers. This R&O isn't an issue of FCC making rules for "encouragement" to produce narrower bandwidth signals. It is the result of someone at FCC that is out of touch with reality. The Bigger Issue: The freedom to use existing digital worldwide standards for HF communications is important for Amateur Radio. It is very much like the freedom to use existing analog bandwidth standards such as SSB and AM voice. Should FCC take take that freedom away also, under the guise of "encouraging innovation"? Should hams be forced to develop 500Hz bandwidth voice modes? Or, should a wide range of communications methods be "encouraged" in USA like it is in the rest of the civilized world? Bonnie KQ6XA 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/ <*> 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/
