[aprssig] APRS Telemetry Parameters

Stan Leeds, KC7EHJ srkleeds at sbcglobal.net
Tue Nov 27 08:26:34 EST 2012

Try here,
http://www.aprs.org/ and look for the following:
"*APRS SPEC! *. APRS continuously evolves. There have been several 
initiatives that have drastically improved APRS network performance and 
useability for users. The original *APRS spec* <doc/APRS101.PDF> was 
updated in 2004 with the *APRS1.1 addendum* <aprs11.html> and since then 
with the *APRS1.2 updates* <aprs12.html>. Most of these new initiatives 
are listed here."

The links are there.

Cheers and 73,
Stan, KC7EHJ

On 11/27/2012 7:31 AM, Dave B wrote:
> Can't get near that APRS101.pdf doc, all our AV/antimalware screams at
> me, and blocks downloads of PDF's from that site!   Odd...  (Unless
> something has got in to that file?)
> But get the overall drift of what is needed it from your summary.
> "value = A x v^2 + B x v + C" where 'v' is the value sent in the
> telemetry packet.
> Perhaps that info could go in the document too, to be complete, with
> perhaps a reference link to the APRS101 document.
> Regards.
> Dave G0WBX.
> On 26 Nov 2012 at 17:38, J T wrote:
>> Those are the standard APRS telemetry coefficients. Refer to page 70
>> of the APRS spec:
>> ftp://ftp.tapr.org/aprssig/aprsspec/spec/aprs101/APRS101.pdf
>> To summarize: the value = A x v^2 + B x v + C, where 'v' is the value
>> sent in the telemetry packet (packet type T).
>> --- On Mon, 11/26/12, Dave B <dave at g8kbv.demon.co.uk> wrote:
>>> http://aprstw.blandranch.net/Telemetry%20Parameters.pdf
>> Hi.
>> What do the figures in the EQNS columns relate to? Multipliers,
>> divisors, dB corrections, or ???
>> Nice to have all that in one place, but more info needed please as to
>> how to use that info, WRT data received off air, to get the value
>> monitored, however that is done.
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