[aprssig] barometric pressure units

Andrew P. andrewemt at hotmail.com
Sun Nov 4 21:47:22 EST 2012

Well, that's interesting. I have examples of both obvious pascals and the other units both on weather stations deployed by my own county's ARES/RACES group (reasonable: N3ESS-2, N3XRV-2, W3AHR-2, unexpected: AA3QN-2, N3NTP-2), and they _did_ mention something at a recent meeting about getting replacement weather sensors for some of the deployments. But, even so, _no_ station in my area is reporting in 10s of pascals, as specified by APRS 1.0.1.

Andrew Pavlin, KA2DDO

Date: Sun, 4 Nov 2012 21:31:53 -0500
From: ldeffenb at homeside.to
To: aprssig at tapr.org
Subject: Re: [aprssig] barometric pressure units

    Do you have any examples of stations
      doing it in the different units?  Have you determined the source
      of their data?


      Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and


      On 11/4/2012 9:21 PM, Andrew P. wrote:

        Greetings, all.


        There seems to be a discrepancy between the APRS protocol
        specifications and what stations are actually sending regarding
        barometric pressure values. The APRS 1.0.1 specification says on
        pages 64 and 67 that pressure should be reported in tenths of
        hectopascals (or tens of pascals), but most stations (at least
        in my area) seem to be transmitting pressure in pascals. But
        there are other stations transmitting other units (what units
        could a pressure of 8272 be?).


        Is this a bug, or a change in the specification that I haven't
        found in the newer revisions of the protocol specification?


        Andrew Pavlin, KA2DDO



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