Hi again Walt, I'll try to keep this brief. :-)
--- In digitalradio@yahoogroups.com, DuBose Walt Civ AETC CONS/LGCA <[EMAIL PROTECTED]> wrote: > There's no rush to create another HF modem in open source...and I think that > most of those hams who are working in open source are also working many > hours at their regular jobs so time to do coding is limited. I agree 100%, which is why I say I'm surprised that Linux has done as well as it has. There are core parts of the OS that really are pretty complex, and while systems programmers are perhaps a little more common than RF engineers, they're still not exactly commonplace. > Do you want is primarily a stand-alone system but use > the Internet if available or do you a system that is primarily dependent on > the Internet but can operate without it? That's a routing question. If the system uses some common routable protocol (such as... uhh... TCP/IP! :-) ), it's easy to put that decision off until a later time. You could easily have your "router PC" have a local DNS that directed all e-mail to [EMAIL PROTECTED] to, e.g., a microwave link with another repeater (or whatever) if your main Internet connection is down. > Do you want this new mode/modem to use a computer's internal sound card or > use one or more sound cards or external sound cards? By "external sound card" I take it you really mean some decent bandwidth DAC/ADC device (like the GNU Radio USRP)? Since from a software perspective interal vs. external cards don't matter. Personally, I like the idea of an OFDM type of system that makes it very easy to add carriers. If you only have, say, some simple (inexpensive) sound card-based system, take your 3kHz bandwidth (or, on VHF and above, perhaps 10-20kHz) and go with it. If you have dedicated external hardware (such as at a repeater site), go for as much bandwidth as you can get and that "gentleman's agreements" will allow. > If a high-speed and a high level of robustness is desired, > then using current or similar current modes, the bandwidth needed isn't > going to fit into 3 KHz...so if we are stuck with 3 KHz on HF, why would a > programmer want to waste their time creating a new mode? Because it's open source and works with a sound card, you'll have a lot more users than the current situation with the relatively spendy SCS modems. -- I'm sorry to hear your Internet connectivity isn't that great. Hopefully it's just a regional thing? I wouldn't call the Internet as reliable (say, for e-mail) as the telephone system, but on the other hand I'd say it can be more reliable than some 2m repeaters I've used! ---Joel The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ 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/
