[OZAPRS] WX Station Help

Mon Nov 30 09:26:37 EST 2009

Okay, I have conducted a little experiment which seems to have yielded 
some results.  I have used UI-View to up load the WXNOW file that is 
generated by Cumulus and the WX data is displaying properly.  I will 
leave it running this way for a day or two to see what happens....

Pete VK2MPJ

Peter Bye wrote:
> I had seen this, but didn't take much from it, because the difference 
> between my "Absoulte" and "Relative" pressures is bugger all, and this 
> difference is much larger.  Also Cumulus is correctly displaying the 
> pressure on the screen, and is correctly encoding the WXNOW file.  The 
> error I am seeing is the data that is in the APRS-IS servers has the 
> different info, which is what I am trying to track down.
>
> I have just edited my height ASL in Cumulus (it was approx 200ft higher 
> than it should be) to see if that makes a difference.
>
> Cheers
>
> Pete VK2MPJ
>
> Tony King wrote:
>   
>> Hi Michael and others,
>> There is comment on this in the FAQ on the cumulus web site, it is 
>> something to do with cumulus calculating the pressure back to sea 
>> level from your height above sea level setting.. There is also a 
>> suggested fix
>>
>>                                                     Regards Tony VK3API
>>
>> Michael Wain wrote:
>>     
>>> 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 
>>> <http://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 <mailto:vk2mpj at internode.on.net>
>>>     *To:* Andrew Rich <mailto:vk4tec at tech-software.net> ; Australian
>>>     APRS Users <mailto:ozaprs at aprs.net.au>
>>>     *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
>>>>
>>>>
>>>>     _______________________________________________
>>>>     OZAPRS mailing list
>>>>     OZAPRS at aprs.net.au
>>>>     http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>
>>>>
>>>>       
>>>>         
>>>     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
>>>     <http://aprs.fi/?c=raw&limit=&call=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
>>>
>>>     ------------------------------------------------------------------------
>>>     _______________________________________________
>>>     OZAPRS mailing list
>>>     OZAPRS at aprs.net.au
>>>     http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>
>>> EGARC Inc. Publicity Officer.
>>>  
>>>  
>>>  
>>> Michael Wain - VK3HAU
>>> Ph : 613 - 51411650
>>> Email - vk3hau at vk3egc.org <mailto:vk3hau at vk3egc.org>
>>> Web - http://www.vk3egc.org 
>>>  
>>> ------------------------------------------------------------------------
>>>
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>>> OZAPRS at aprs.net.au
>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>   
>>>       
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