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Hi Michael and others,<br>
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<br>
<br>
Regards Tony VK3API<br>
<br>
Michael Wain wrote:
<blockquote cite="mid:5D730A45F67B4DFDAA16BF5B8EA6CDAF@ASUS" type="cite">
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<div><font face="Arial" size="2">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 <a
moz-do-not-send="true" href="http://www.qsl.net/vk3hau/weather">www.qsl.net/vk3hau/weather</a>
, 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</font></div>
<div> </div>
<div> </div>
<div><font face="Arial" size="2">VK3HAU, Michael Wain, Weather APRS
VK3HAU-10 </font></div>
<blockquote
style="border-left: 2px solid rgb(0, 0, 0); padding-left: 5px; padding-right: 0px; margin-left: 5px; margin-right: 0px;">
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">-----
Original Message ----- </div>
<div
style="background: rgb(228, 228, 228) none repeat scroll 0%; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"><b>From:</b>
<a moz-do-not-send="true" title="vk2mpj@internode.on.net"
href="mailto:vk2mpj@internode.on.net">Peter Bye</a> </div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b>
<a moz-do-not-send="true" title="vk4tec@tech-software.net"
href="mailto:vk4tec@tech-software.net">Andrew Rich</a> ; <a
moz-do-not-send="true" title="ozaprs@aprs.net.au"
href="mailto:ozaprs@aprs.net.au">Australian APRS Users</a> </div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b>
Saturday, November 28, 2009 5:20 PM</div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b>
Re: [OZAPRS] WX Station Help</div>
<div><br>
</div>
Ben Lindner-VK5JFK wrote:
<blockquote cite="mid:4B106587.2050100@activ8.net.au" type="cite">Hi
Rete,<br>
<br>
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.<br>
<br>
Ben</blockquote>
<br>
Ben,<br>
<br>
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.<br>
<br>
<br>
<br>
Andrew Rich wrote:
<blockquote cite="mid:8EC4CD6817214D8AB3255340B5DAE1CB@Laptop1520"
type="cite">
<pre wrap="">Latest packet from you
VK2MPJ>APRS,TCPIP*,qAC,<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:T2AUST:@272343z3451.23S/15034.41E_225/002g004t094r000P000h43b10165eCumulusEW">T2AUST:@272343z3451.23S/15034.41E_225/002g004t094r000P000h43b10165eCumulusEW</a>
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
<a moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:OZAPRS@aprs.net.au">OZAPRS@aprs.net.au</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://lists.aprs.net.au/mailman/listinfo/ozaprs">http://lists.aprs.net.au/mailman/listinfo/ozaprs</a>
</pre>
</blockquote>
<br>
Andrew,<br>
<br>
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.<br>
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. <br>
<br>
Current WXNOW data is <br>
Nov 28 2009 17:12<br>
270/003g013t098r000p...P000h25b09970 <br>
But displayed data is according to aprs.fi<br>
<br>
<span class="raw_line">2009-11-28 06:13:35 UTC: <b><a
moz-do-not-send="true" href="http://aprs.fi/?c=raw&limit=&call=VK2MPJ">VK2MPJ</a></b>>APRS,TCPIP*,qAC,<a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:T2SYDNEY:@280613z3451.23S/15034.41E_270/003g014t099r000P000h24b10105eCumulusEW">T2SYDNEY:@280613z3451.23S/15034.41E_270/003g014t099r000P000h24b10105eCumulusEW</a><br>
Which would (and does) result in a pressure of 1010.5hpa being
displayed.<br>
<br>
Yes I am connected to the APRS-IS via UI-View at the moment, I don't
have RF capability at the moment :(<br>
<br>
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<br>
<br>
Does this make sense??<br>
<br>
Cheers <br>
<br>
Pete VK2MPJ<br>
</span>
<p> </p>
<hr> _______________________________________________<br>
OZAPRS mailing list<br>
<a class="moz-txt-link-abbreviated" href="mailto:OZAPRS@aprs.net.au">OZAPRS@aprs.net.au</a><br>
<a class="moz-txt-link-freetext" href="http://lists.aprs.net.au/mailman/listinfo/ozaprs">http://lists.aprs.net.au/mailman/listinfo/ozaprs</a><br>
</blockquote>
<div>EGARC Inc. Publicity Officer.<br>
</div>
<div> </div>
<div> <br>
Michael Wain - VK3HAU<br>
Ph : 613 - 51411650<br>
Email - <a moz-do-not-send="true" href="mailto:vk3hau@vk3egc.org">vk3hau@vk3egc.org</a><br>
Web - <a moz-do-not-send="true" href="http://www.vk3egc.org">http://www.vk3egc.org</a>
<br>
</div>
<pre wrap="">
<hr size="4" width="90%">
_______________________________________________
OZAPRS mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OZAPRS@aprs.net.au">OZAPRS@aprs.net.au</a>
<a class="moz-txt-link-freetext" href="http://lists.aprs.net.au/mailman/listinfo/ozaprs">http://lists.aprs.net.au/mailman/listinfo/ozaprs</a>
</pre>
</blockquote>
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