[aprssig] Is floating point telemetry allowed in APRS?

Heikki Hannikainen hessu at hes.iki.fi
Wed Mar 27 15:02:47 CDT 2013


On Wed, 27 Mar 2013, Andrew P.  wrote:

> I was adding support for telemetry analysis to my program YAAC, and 
> found that some sites are sending floating point raw telemetry (instead 
> of the range 0 to 255 integer values specified for the T# messages in 
> the APRS 1.0.1 spec). Is this allowed by a later spec change I haven't 
> read yet?

It's not in any specs that I know of. Also, some sites transmit larger 
values than 255. 8 bits is very little, after all, it's year 2013, not 
1980.

> Considering that it is in use in live sites, it looks like I need to 
> support it regardless. But I was just wondering.....

I chose to parse it, too. Against the spec.

   - Hessu



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