Well, MIL-STD-188-110A uses a single phase shifted tone , I guess that made it even more non-intuitive ? The difference between packet and this MIL-STD is just huge. Interleaver to fight fade and QRM, equalization to benefit from multipath and the list could just go on and on. 300 baud packet is a joke. 73 de Per, sm0rwo
--- kv9u <[EMAIL PROTECTED]> wrote: > It still seems a bit non-intuitive that using a 2400 > baud rate with two > tones can work well and yet 300 baud packet hardly > works well at all. > There is something that I am missing here. > > 73, > > Rick, KV9U > > expeditionradio wrote: > > > > Yes. MIL STD 188-110 is in PCALE software (along > with standard ALE). > > Operators have been using -110 (outside USA) for > data files. > > I was using the RFSM2400 while I was in Hong Kong, > China. > > It is a good system, and the modified narrow > version takes no > > more bandwidth than some other digital modes or > SSB voice. > > > > As you know, USA has an arbitrary 300 > symbol/second limit in > > the USA Data Subbands. But there is no such 300 > baud limit in > > the "phone and image" subbands, so some of us in > USA have > > used -110 to send image files. It does that quite > well, but > > the real forte of -110 is data FTP and email. > > > > Wow... 2007... a shame that USA hams are living > under those > > antiquated FCC rules made for the previous > century's technology. > > USA hams still sit rotting in the FCC's technology > jail. > > > > The rest of the world's hams can use RFSM2400 > freely for data or mail. > > > > Bonnie KQ6XA > > > > > > ____________________________________________________________________________________ No need to miss a message. Get email on-the-go with Yahoo! Mail for Mobile. Get started. http://mobile.yahoo.com/mail
