From what the Winlink 2000 owners have said in the past, they want to control at least two frequencies per band in order to maximize access to their scanning automatic stations.
There is no question that they consider the Winlink 2000 system to be much more important than contacts between two human operators since K4CJX has claimed their system saves lives and helps world governments find many missing ships at sea, provides vital weather reports, etc. When we beta tested SCAMP, the detection system covered the entire bandwidth to be used. SCAMP had a constant width of around 2 kHz, but for anyone using a Pactor 3 modem with busy frequency detection, they would need to insure the frequency was clear for the entire width of the maximum 18 tones, or else would have to have some kind of adaptive detection system that determined if it was possible to widen the band width. 73, Rick, KV9U jgorman01 wrote: > Don't believe everything you hear. A couple of years ago when I was > doing packet work, I listened to winlink a lot. What I heard > convinced me that clients did not listen and that the hidden > transmitter was not only a problem with other stations, but winlink > stations too. You can't believe how many times I heard a winlink > session be interfered with by another winlink session starting up! > > Do you really think they would consolidate their pmbos to just a few > frequencies with busy detection even if no one interfered with them? > I don't believe so. Their users expect "instant" access and would not > be willing to come back periodically to try and initiate a session > should a "busy detector" not allow a session. As a result, they will > continue to try and gain access to sufficient frequencies to allow one > freq, one pmbo. > > Pactor 3's proclivity to increasing its bandwidth anytime during a > session is one of the biggest problems, and will continue to be so > regardless of busy detection or not. I don't understand how anyone > can expect hams not to initiate sessions within a 3 kHz channel around > ANY pactor signal. Heck, entire sessions may take place in pactor 2 > and last for the duration of a band opening. It seems unreasonable to > claim all that space when it may not even be used. It's like saying > my use is more important than anybody else's. > > Jim > WA0LYK > >
