[OZAPRS] WX Station Help
Samantha
samantha at femtech.com.au
Mon Nov 30 12:25:05 EST 2009
I use cumulus and the wxnow file and I find it to be ok...
Samantha
vk4fq
-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Peter Bye
Sent: Monday, 30 November 2009 8:27 AM
To: Australian APRS Users
Subject: Re: [OZAPRS] WX Station Help
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_225/002g004t094r000
P000h43b10165eCumulusEW
>>>>
>>>> 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:@280613
z3451.23S/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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>
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