[OZAPRS] WX Station Help

[Michael Wain]

I to had the same problem, I found that when I had the Cumulus Software Configuration for the stations Altitude set at my ASL of 36 meters the Pressure on the software's page was very close to what the weather station's reading was, but the pressure was way of on aprs reading and website webpage www.qsl.net/vk3hau/weather , but if I set the ASL on Cumulus to 126 Meters the pressure stayed the same on the software's page but the APRS and website's webpage changed to be very close to the same, I do not know why this happens but its does, you have to play with the ASL setting in Cumulus's station setting, and it has same thing to do with it reads the data from the weather station to, cus I played with the ASL setting in the weather station and it change the reading on both the software and out put to APRS / webpage, but could not get the pressure reading to even come close, so the only way I found to get it close was to put in fake ASL. hope this helps


VK3HAU, Michael Wain, Weather APRS VK3HAU-10 
  ----- Original Message ----- 
  From: Peter Bye 
  To: Andrew Rich ; Australian APRS Users 
  Sent: Saturday, November 28, 2009 5:20 PM
  Subject: Re: [OZAPRS] WX Station Help


  Ben Lindner-VK5JFK wrote: 
    Hi Rete,

    I believe that there is raw pressure and station pressure ( I stand to be corrected on this matter ) this is probably where the difference is.

    Ben

  Ben,

  I did think that this may be the case, however, upon checking at my QTH there is only a 0.6hpa difference bewtween Absolute and Relative pressures.



  Andrew Rich wrote: 
Latest packet from you

VK2MPJ>APRS,TCPIP*,qAC,T2AUST:@272343z3451.23S/15034.41E_225/002g004t094r000P000h43b10165eCumulusEW

aprs.fi is showing 1016.5

Last WX report: 2009-11-27 23:43:34 UTC (3m53s ago)
2009-11-28 10:43:34 EST local time at Nowra, Australia [?]
Temperature: 34.4 °C
Dew point: 20.0 °C
Humidity: 43 %
Pressure: 1016.5 mbar
Wind: Southwest 225° 0.9 m/s (Gusts 1.8 m/s)
 Rain: 0.0 mm during last 1 hour

Are you sure you were looking at the latest data ? where you connected to 
the APRS IS when you saw the anomoly ?

>From an independant evaluation, your system appears to be working.

Andrew VK4TEC


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  Andrew,

  I am trying now to see how that data has gotten into the system.  According to the wx logs here at my station, the QNH has not been anywhere near 1016.5hpa today infact the highest it has been in the last 24hrs was approx 1010 at 220 last night.
  What Cumulus does, is generates the WXNOW file in the correct APRS standard (which I confirmed with the UI-VIEW help files) and then uploads the info to the APRS-IS at the intervals I specify.  

  Current WXNOW data is 
  Nov 28 2009 17:12
  270/003g013t098r000p...P000h25b09970 
  But displayed data is according to aprs.fi

  2009-11-28 06:13:35 UTC: VK2MPJ>APRS,TCPIP*,qAC,T2SYDNEY:@280613z3451.23S/15034.41E_270/003g014t099r000P000h24b10105eCumulusEW
  Which would (and does) result in a pressure of 1010.5hpa being displayed.

  Yes I am connected to the APRS-IS via UI-View at the moment, I don't have RF capability at the moment :(

  So what I am trying to determine is where the pressure goes from b09970 in the WXNOW to b10105 as per the packet from aprs.fi

  Does this make sense??

  Cheers 

  Pete VK2MPJ



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EGARC Inc. Publicity Officer.
 

 
Michael Wain - VK3HAU
Ph : 613 - 51411650
Email - vk3hau at vk3egc.org
Web - http://www.vk3egc.org  
 
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