Update 4.9n

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Update 4.9n

Post by admin » Wed Aug 29, 2012 11:07 pm

Update to Meteohub V4.9n (NSLU2, x86, SheevaPlug, DreamPlug, iConnect, DC01) brings these features:
  • Feeds CWOP with true altimeter pressures.
  • Adds altimeter pressure as values (actual_thb0_altimeter_hpa, etc)
  • Adds additional support for ANACON devices for Lufft WS600 stations by using "=" delimiter instead of "#" as separator in device specifier to separate the unit number. Example: "/dev/ttyS0=1" instead of "/dev/ttyS0#1" when ANACON is also connected to WS600.
Update Link: http://www.meteohub.de/files/update-v4.9n.upd

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N5XL
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Re: Update 4.9n

Post by N5XL » Sat Sep 01, 2012 4:48 pm

Hi Boris,

I finally had a chance to update to 4.9n yesterday and there appears to be problem with Altimeter pressures being reported to CWOP. While I cant tell for sure, it appears that the Altimeter formula may not be taking into account any barometer offsets from the sensor calibration page. On inspection of my data, it looks like CWOP receives an Altimeter value about 2 mbar higher than what I calculate it should be. This matches up closely with the 2 mbar reduction I use for my barometer offset on the Settings page of Meteohub. The reason I cant tell for sure if this is actually the problem is that when I reconfigure Meteohub to take into account my station elevation, Meteohub calculates a SLP value for my station that gives me roughly the same pressure error. This makes it difficult for me to determine if Meteohub is sending SLP instead of Altimeter or if Meteohub is simply not factoring in a barometer offset in the Altimeter calculation.

Below is the raw data I see on the APRS network. Unfortunately, I've got changing weather conditions here at the moment so its not as stable as I would have liked to show you but its close enough for you to see the problem. Data streams with "qAC" represent data sent via the internet with the APRS network selected using the AWK code for Altimeter. The data stream with "qAX" represent data sent via the internet when I select the CWOP checkbox and gives values from what I am assuming is the the built in Altimeter calcuation in Meteohub. Once I saw the error, I reverted back to the AWK code until we can sort this out.

N5XL>APRS,TCPIP*,qAC,FIRST:@011117z3348.73N/11147.18W_315/002g003t080r000p000P000b10132h54eMH49
N5XL>APRS,TCPIP*,qAC,SEVENTH:@011132z3348.73N/11147.18W_315/001g003t080r000p000P000b10132h54eMH49
N5XL>APRS,TCPXX*,qAX,CWOP-1:@011217z3348.73N/11147.18W_315/001g002t079r000p000P000b10153h55eMH49
N5XL>APRS,TCPXX*,qAX,CWOP-2:@011232z3348.73N/11147.18W_315/001g002t079r000p000P000b10152h56eMH49
N5XL>APRS,TCPIP*,qAC,CORE-2:@011247z3348.73N/11147.18W_315/001g002t078r000p000P000b10137h58eMH49
N5XL>APRS,TCPIP*,qAC,THIRD:@011302z3348.73N/11147.18W_315/002g006t078r000p000P000b10140h58eMH49

Aside from the Altimter error which Im sure we can fix in short order, a factor that needs to be considered here is that stations are able to use either APRS or CWOP to transmit weather data to CWOP. In the United States, most amateur radio operators use APRS to upload weather data to CWOP. This is important to know because if an individual is a CWOP member and uses APRS to transmit data, they would not get an Altimeter value correction sent to CWOP the way it appears Meteohub currently implements Altimeter reporting.

As a solution to this, it appears you could combine the CWOP network and the APRS network into one network as data transmitted via APRS makes its way into CWOP. CWOP users would simply use the APRS network to transmit their data. You could then have the Altimeter calculation hard coded under APRS but it would actually be much better if Altimeter were a user selectable option (like a checkbox) instead of being invisible the way it is now. In this configuration, it would take into account APRS users that are not CWOP members and give them the option of not performing Altimeter calculations. Ideally, Altimeter would be a user selectable check box located on the Weather Networks page at the bottom where the sensor selection section is located. This would be much more intuitive to CWOP users and CWOP members that use APRS to transmit data as it would serve as a visual confirmation of sending Altimeter to CWOP.

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Re: Update 4.9n

Post by admin » Sat Sep 01, 2012 8:43 pm

Thanks for spotting this. CWOP did still get sealevel. I fixed this bug.
APRS will get sealevel, while CWOP gets altimeter. Pressure calibrations are considered.

I just uploaded a new 4.9n with these bug fixes. By installing it via "update (auto) again", you get the latest version. Please give it a try.

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Re: Update 4.9n

Post by N5XL » Sun Sep 02, 2012 4:16 pm

Looks like there is still a problem. Upgraded to the revised 4.9n and reconfiguring the station to let meteohub report altimeter to CWOP...It still appears to give SLP.


Image


Boris, I have to leave for a business trip and I will be away from my home office for about 3 weeks. Unfortunately, I wont be able to come back to this until I return. Just letting you know that if you make any changes, I wont be able to tell you how they work until I get back.

Best regards,
David

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Re: Update 4.9n

Post by Billy » Wed Sep 05, 2012 4:56 pm

Just updated my DC01 System to 4.9n.

Problem, changing the password from meteohub to another one via "Wartung" not possible.
The old one "meteohub" is still valid. :cry:

Regards
Billy

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Re: Update 4.9n

Post by admin » Sat Sep 08, 2012 6:57 pm

will be fixed with next update

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Re: Update 4.9n

Post by N5XL » Sat Sep 22, 2012 4:28 pm

Hi Boris,
I've returned home from my trip and I see that there was an update to 4.9n while I was away. I've downloaded that update (4.9n, build 1116) this morning. After updating, reconfigured Meteohub to use CWOP and I logged about one hour of data as shown below. There still appears to be some kind of issue with the Altimeter calculation.

Data in green was transmitted via APRS network using the NWS Altimeter formula. Data in yellow was transmitted via CWOP option in Meteohub.

Image

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Re: Update 4.9n

Post by N5XL » Sun Sep 23, 2012 5:38 pm

Hold on Boris...it looks like I might not have the most up to date build.

When I "auto update", I am told that 4.9n is available and ready to install. I click install and all appears to proceed normally. However when I look at the system info tab after the upgrade, I see I still have the same build number (1116) as before I initiated the upgrade. Clicking on check for update again shows that the update 4.9n is available yet again. Clicking on install simply repeats the process and this cycle continues over and over.

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