What if an individual wants high speed AND good low signal leveel throughput?
I think the first thing is that individuals need to decide what USER throughput they want in CPS or WPM or PPM and then at what the lowerest SNR they expect the mode to provide 95% copy (or some percent of perfect). As Dave AA^YQ has said, there may not be one mode that works for all bands and under all scenerios...so more than one mode may be called for. IMHO a chat mode need not provide for more then 60 or so WPM but you might want it to provide 95% copy at a -15 dB SNR and you don't care what the bandwidth is as long as its small. On the other hand you may to esnt ASCII and binary files from point to point with a throughput so that a 40 Kbps file can be sent in 5 milutes or less and the mode must give 98% copy at a -10 dB SNR and if it shold have an ARQ feature that can be turned on to give you 100% copy for binary. You might wind up with a suite of modes call from a menu such as attached. Walt/K5YFW -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of John Champa Sent: Friday, March 16, 2007 2:57 PM To: [email protected] Subject: Re: [digitalradio] Re: RSM2400 / MIL-STD-188-110 Poor Bonnie! We are hitting you from both directions: --some want better weak signal performance at the cost of speed (~HF) --some want more speed at the cost of signal performance (~10M & VHF) ----Original Message Follows---- From: kv9u <[EMAIL PROTECTED]> Reply-To: [email protected] To: [email protected] Subject: Re: [digitalradio] Re: RSM2400 / MIL-STD-188-110 Date: Fri, 16 Mar 2007 09:32:30 -0500 If the 110A works this well at 2400 baud, what would happen with slower speeds? From what I understand, it does require a good signal to get through, perhaps comparable to the WinDRM software at maybe +10 S/N dB or maybe a bit below that? 73, Rick, KV9U Per wrote: > 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 > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Great things are happening at Yahoo! Groups. See the new email design. http://us.click.yahoo.com/lOt0.A/hOaOAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 Yahoo! Groups LinksTitle: Modes
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