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[OZAPRS] RE: [aprssig] DTMF Weather telemetry

Scott Miller scott at opentrac.org
Fri Aug 20 15:37:29 UTC 2004


I think you're right.  40 ms per character and 40 ms dead time, so 80 ms per
character total, with 4 bits per character - that's 50 bits per second.  Not
really enough to give you a full high-resolution fix each second.

Scott
N1VG
----- Original Message ----- 
From: "Robert Bruninga" <bruninga at usna.edu>
To: <scott at 3xf.com>; <vk4tec at hotmail.com>; <aprssig at lists.tapr.org>
Cc: <ozaprs at marconi.ics.mq.edu.au>
Sent: Friday, August 20, 2004 7:40 AM
Subject: [OZAPRS] RE: [aprssig] DTMF Weather telemetry


> I think the TTone spec requires dead time between
> each character even if it is different.  That is part
> of the high reliability detection scheme... I think... Bob
>





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