Except for the fact that PSK has no error correction, no compression, no formatting capabilities and no way to accurately know if the traffic was delivered properly other than read back, your figures are fairly accurate. Fortunately, most Winlink traffic is moved on NTIA spectrum, where it is able to run full speed. I am not a large Winlink fan, but I do like 2K MT-63, and I am encouraged by the 2K WINMOR mode that is currently being tested. I don't suspect much development of the newer wide-and modes will be wasted on Amateur spectrum in the future, as most of the long haul and critical traffic transport seems to be migrating toward NTIA spectrum, and leaving the short-haul for VHF where wideband and closed-squelch operation are a given. It further divides Amateur Radio, but at least those who move to where their assistance is helpful can take advantage of modern technology. For keyboard to keyboard, where nothing more important than Call, QTH and 59 needs to be passed, BPSK is exceptionally spectrum efficient. It would be wonderful if a single piece of traffic could be moved on multiple BPSK streams in a parallel fashion. However, when you factored in the redundancy needed to provided error-free reception, I would wager the end result would consume wider bandwidth and take more time. But, for the 99% that the other 1% are defending by operating in the true interest of preserving the Amateur Radio Service, wideband digital modes are a waste of valuable DX or contesting spectrum. If it wasn't for DXing and contests, us Rabid digital dinks would never get the lawn mowed..... :) And Amateur Radio is a "Big Tent" endeavor; when properly executed, provides something for everyone. David KD4NUE
-----Original Message----- From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of kh6ty Sent: Thursday, March 26, 2009 11:16 AM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] No FCC data bandwidth limit on HF Re: USA ham rules > " Moving traffic " IS NOT what 99% of hams want to do on > 20 meters working DX IS. > And this band is filled with stations doing just that. I think you are quit right, Bruce, and the Winlink 2000 network is probably currently the most efficient say of "moving traffic", but that interests less than 1% of the licensed hams in the US. A single 3 KHz-wide Pactor-3 channel can, under average good conditions, process about 400 wpm per minute, and this assumes the channel is busy all the time. In comparison, a single 3 KHz-wide "channel" can accomodate 30 PSK63 stations, all simultaneously sending traffic at 100 wpm, for a total of about 3000 wpm. Since the traffic on PSK63 can be passed in parallel, instead of serially, as on the Pactor-3 channel, the narrowband modes are obviously more efficient overall than a sngle Pactor-3 channel. 73, Skip KH6TY http://kh6ty. <http://kh6ty.home.comcast.net> home.comcast.net
