I agree with you completely. The operative condition is clearing a frequency AND LETTING THE NEXT STATION CONNECT. This implies that users must wait their turn, rather than moving to another frequency and simultaneously using up more spectrum. I look at winlink who has several frequencies on each band, yet only a few receivers are attached at any one time. It's like they want to keep the frequencies without receivers clear by having people call on them continuously. This is not spectrum efficient by any stretch of the imagination. It is also obvious that they want to give the impression of little wait time. Again, not spectrum efficient!
To adequately assess the the total needs, one must admit that narrow band, low throughput, long holding time modes also have a place on the bands. How you balance this requires considerable thought and probably compromise. Jim WA0LYK --- In [email protected], KV9U <[EMAIL PROTECTED]> wrote: > > Jim, > > Your analogy of the party line phone is quite correct. Packet suffers > from not only time sharing, but also has a really bad modulation scheme > for HF and should never have been used for this purpose. > > While some of this technology can be used on VHF and above frequencies, > it just does not seem appropriate for HF use due to the difficulty we > have with throughput versus the need for bandwidth limitations due to > the much narrower BW available and the long distance propagation which > greatly increases the number of users of a given frequency. And not > necessarily the users of that server either, but for other reasons, > since no one owns an HF frequency. We are completely unlike a commercial > or government channel. That is why BBS systems, ALE, or other > > Higher speeds require better conditions or wider bandwidths. I can see > this useful for connecting to those limited resources, i.e., e-mail or > BBS server, since there may be only one of those you can connect to at > a given time from your QTH. Faster speeds means that operators can clear > their traffic and let the next station connect. The other reason for > higher speeds on HF would be for emergency use, but whatever design you > have for emergencies, must be regularly exercised during normal times to > insure it will be there when the emergency arrives. > > 73, > > Rick, KV9U > > 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/
