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[aprssig] I'm brainstorming, so don't beat me up!

Curt, WE7U archer at eskimo.com
Thu Jul 7 17:02:46 UTC 2005


On Thu, 7 Jul 2005, Earl Needham wrote:

> At 10:40 AM 7/7/2005, Curt, WE7U wrote:
> >While we're at it, would some other non-standard rate _between_ 4800
> >and 9600 work?  What is the maximum rate we could get through
> >voice-grade rigs without modification, even if we have to change to
> >a different type of modulation?
>
>          If we're going to consider another form of modulation, I'd like to
> enter my vote for 100 WPM (or faster) CW.  Maybe a LOT faster -- can we
> design a system that does 1200 WPM CW?

That's extremely fast!  What you're describing is (assuming 5-char
words and a space between each one) 6 * 1200 chars per second, or 6
* 1200 * 8 bits per second.

I assume you mean something equivalent to 1200 baud packet speed in
terms of characters transferred.  That's 1200 bits per second.

I don't know whether a CW system could be designed that would
compete with 1200 baud AX.25 packet.  There must be a good reason
that people went with the 2-tone modem originally.  Perhaps coherent
CW would suffice for this idea, which I think is a two-tone modem
anyway isn't it?

--
Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto:    A tax on people who are bad at math." -- unknown
"Windows:  Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me:  I picked the coordinate system!"




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