The most current SCAMP Specification file was Revision Q, dated Feb 1, 2005. It is on the ScampProtocol yahoogroup. That group has been very quiet for well over a year as we are waiting for Rick, KN6KB, to complete his priority work with other programming before he can get back to working on SCAMP again.
While SCAMP is considered an asynchronous mode, it works very well in my experience and from a human perspective seems like a synchronous mode to a large extent. You have to see it working to believe it. You almost think "this can not be happening" as the data is rapidly transferred and your rig and the other rig are handling the negotiations. Amtor is obsolete for all practical purposes as it requires rapid, two transmissions per second of those three characters for each TX and while it seemed very high tech when we first used it, Pactor was not quite so extreme and had a much longer packet and longer window. I am only guessing that the Amtor timing starts the moment the first character is sent and the transmitter is keyed. Due to propagation delays around the world there were some issues on some stations being too far away. And then again too close if the rig turnaround time was insufficiently fast. Pactor has some adjustments for that. 73, Rick, KV9U Patrick Lindecker wrote: >Hello Rick, > >RR for all! > >Pax2 has a speed of 117 wpm for a useful speed of about 50 to 60 wpm in >average after the protocol management... > > > >>The timing of Windows/Linux is not so bad that you could not have a moderate >>sized >window. >> >> >Under Linux and DOS, I think a synchronous ARQ mode is possible, because you >can manage samples one by one (I supposed so under Linux as I don't know it, >but I'm sure of this under DOS). > >If you have more details (or a paper) about the way they manage this problem >of timing, it would be very useful for everybody. >I think, for a very big PC, it is perhaps possible for a not so rapid ARQ mode >as AMTOR but due to the timing Windows errors, the quality will be bad >compared to an electronic, as you will never sample at the good moment. > >One question on which I can't have an answer. >In Amtor ARQ, is the time reference for the beginning transmission of a 210 ms >frame (3 characters block): >* the beginning of the previous frame (so you may add small errors of timing >but it is easier to manage), >* the beginning of the transmission (there is no addition of errors of timing >but it is more severe) ? >I don't know exactly what does the AMTOR electronic. > >73 >Patrick > > > > 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/
