[OZAPRS] DTMF Weather telemetry

[David Hardy]

The generally accepted spec for DTMF for reliable detection is 70ms tone
on then 30ms tone off enabling 10 digits per second. At 4 bit per digit
thats 40 b/s.

Dave vk2jdh


-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Andrew Rich
Sent: Saturday, August 14, 2004 11:56 PM
To: TAPR APRS Special Interest Group
Cc: ozaprs at marconi.ics.mq.edu.au
Subject: [aprssig] DTMF Weather telemetry


Has anyone ever used DTMF to send telemetry ?

Example

A278B015C027

Wind 278 deg Speed 015 Temp 027

Or even APRS ?

27*34*45A = 27.34.45B (assuming * = . and A = North and B = South)
153*06*21C = 153.06.21E ( assuming * = . and C = West and D = East)

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