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[wxsig] Hobby Boards Barometer

Dave Barton dbarton at nettally.com
Thu Apr 10 11:21:29 UTC 2008

More information on this issue.  This web site, 
http://www.wxqa.com/callsminmax/index_callsminmax.html, has logs of 
T238+ weather stations.  I've only checked a handful of T238+ stations, 
but I have found a couple of stations which seem to to have the same 
issue as mine, N5KUK and K3YJP-4.

There is another station, KA1GEU*, *that has a normal range of first 
decimal places.  However, his station is reporting via the Internet, not 

I'll try to find more examples after work today.  Now I wonder if it's 
the modem board?


Gerry Creager wrote:
> I'll have to get some sleep, then check but I think the APRS spec, and 
> therefore FindU, resolve to 1 mB.
> More's the pity.
> gerry
> Dave Barton wrote:
>> I am puzzled by something.  I recently bought and hooked up a Hobby 
>> Boards barometer (B1-R1-K) and it seems to be working OK.  One thing 
>> I am seeing is that the barometric pressures reported by FINDU almost 
>> always have a .0 for a decimal millibar value.  In other words, 
>> 1016.0, 1017.0, 1018.0.  I have occasionally seen xxxx.1 or xxxx.2, 
>> but never xxxx.3 through xxxx.9.  My FINDU plots (AI4GF-4) have a 
>> very jumpy barometer chart.  The barometer is supposed to have a 
>> resolution of 0.007 in.Hg.
>> I looked at the raw packets and the anomaly is reflected in the raw 
>> packet.   I have the latest firmware, 1.15.8R.
>> I saw a suggested mod of a resistor in parallel with R1 but have not 
>> done that because I don't quite understand the mod.  Could this 
>> problem somehow be related to not having done the mod?
>> 73, Dave
>> AI4GF
>> Tallahassee, FL
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