[aprssig] Is floating point telemetry allowed in APRS?

Charles Bland root at blandranch.net
Wed Mar 27 16:38:04 EDT 2013

Also look at the Base91 Telemetry spec (attached). This allows for larger
numbers and thus wider ranges.

Like the others (and I've just been through this writing APRS-TW) I only
know of telemetry being sent as integers and the equation values are what
adds the decimals...... per the specs.


On Wed, Mar 27, 2013 at 1:09 PM, Steve Dimse <steve at dimse.com> wrote:

> The spec is not fluid that way. If it says telemetry should look like
> T#005,199,000,255,073,123,01101001
> sending
> T#005,199.1,000,255,073,123,01101001
> is not within the spec, and many parsers will reject the packet outright,
> others might truncate, still others might crash. The results are undefined
> and therefore should not be used. The whole point of the spec was to have
> data that everyone could understand in the same way.
> People that have non-standard needs are supposed to use the user-defined
> part of the spec which allows for any data one might need without causing
> problems in other parsers.
> Can you give an example of such a packet?
> Steve K4HG
> On Mar 27, 2013, at 4:01 PM, Charles Blackburn wrote:
> > that is a good question, although i would assume that you could just
> drop the fraction and be done with it.
> >
> > charlie
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > http://www.tapr.org/mailman/listinfo/aprssig
> >
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> http://www.tapr.org/mailman/listinfo/aprssig
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.tapr.org/pipermail/aprssig_lists.tapr.org/attachments/20130327/36773d37/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: APRS BASE91 Telemetry Spec.pdf
Type: application/pdf
Size: 104776 bytes
Desc: not available
URL: <http://lists.tapr.org/pipermail/aprssig_lists.tapr.org/attachments/20130327/36773d37/attachment.pdf>

More information about the aprssig mailing list