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The Envoy handles the "external temp sensor" data in some different ways especially related to the internal values associated with Temp, RH, Dewpoint, Heat, EMC and Air density and with some only fixated on specific values it does become a bit of a hole to get into without actually looking at the entire group of record values associated with the so called "internal temp value" be it the internal internal one or the external internal one.       
It's possible to mathematically compensate the RH reading using the second thermometer. See here. I wonder if a similar technique is employed in the Envoy.
Q: Anybody know what filter tests Davis has done for the VP2 rain cones?
I have a  VP2   and have in the cone a sink strainer screen.  what you are thinking is a good idea.
I have my VantageVue on an 8' pole mounted above the peak of my garage roof.  I live in a forest and have a tree canopy that covers my entire lot.  Every month the rain gauge gets clogged with tree scum/debris/residue/crap.  Yes, I could climb up there every 20 to 30 days and clean it out 8 months of the year, but I'd rather not.

I'd like to run a possible solution by you and get your reaction.

I'm considering fabricating a fine aluminum wire screen (window screen material) into a cone shaped object maybe 4 or 5" high, with the diameter of the largest end a little smaller than the diameter of the large top opening of the VantageVue rain gauge.  The idea would be like a "gutter helmet" where the pointed tip of the screen cone would be up, and the large side setting into the gauge.  The tree crud would settle or drop off along the lower perimeter of the opening while the rain would still be able to enter the screen over a the entire surface area of the screen (except where crud gets stuck along the bottom perimeter outside of the screen material.)  I'd have to monitor it to see to what extent the crud drops off versus collects on the screen.  The reason the screen cone would be mounted just INSIDE the top opening of the gauge cup is to be sure water is directed into the cup and not run down along the screen and miss the cup.  I'm thinking that while some crud may collectd along the perimeter edge, all the water would still be collected and measured.

Has anyone done anything like this to help minimize the need to clean and unclog the the rain gauge in difficult to reach locations?
Weather Station Pictures / Re: Davis VP2 with 24 hr FARS in the Philly Burbs
« Last post by DRoberts on Yesterday at 10:54:23 PM »
I think that looks pretty nice, especially since you have ambitious plans to mount the anemometer on your roof.

Hope you enjoy your station as much as I am enjoying mine. I only wish I knew more about the technology.
Other Weather Software / AWeather radar polling issues
« Last post by castleromeo on Yesterday at 10:36:56 PM »
I recently installed AWeather which is a cross-platform open source weather app on my Windows 7 x64 PC. The only issue is the program keeps getting fetch errors for radar images.

Can someone supply a WORKING fetch URL for radar images that's free to access?

Thanx in Advance,
 :arrow: For Sunday - June 17, 2018  :!:

No the external connection switches the internal temp sensor off and uses the so called external temp which is essentially the internal temp relative to the humidity sensor which is not affected by internal heating

You may be right, but I would be rather surprised if you are. My understanding is that the 'link' between temperature and humidity is within the sensor. I believe that it reports the two actual 'final' readings separately - not that it reports a humidity value which is then corrected by the console on the basis of the temperature reading to give the 'real' relative humidity. Are you absolutely sure that it works as you say?
I believe that I am correct in saying that the Envoy allows the plugging in only of an external temperature sensor. Measuring indoor humidity remains a problem. Your argument about the problems presented by the design of the VP2 console is a bit circular, since Davis were responsible for that design and could, presumably, have allowed for the possibility of an external sensor.

Just to clarify that, the so called "External temperature sensor" than can be plugged directly into the Envoy when plugged becomes a replacement for the Internal on board sensor and is reported as Internal temp so effectively even though one might call it an external sensor it is actually being reported as the Internal temperature. A Temp/Humidity sensor plugged directly to the Envoy simply does not work and blows the temp way out (on the temp side only but does not affect the internal humidity) but then there is no real issue with the Humidity anyway.     

Because of the way Temperature/Humidity sensors work, a temperature error (due to the sensor being 'heated') leads to a humidity reading error as well, even if the sensor is otherwise working perfectly. I assume that even if an external temp sensor is plugged in, the Envoy's humidity reading is influenced by the temperature that the internal sensor is seeing (and would be reporting if the external sensor were not plugged in). I therefore don't see a way, even with the Envoy, of getting accurate internal humidity readings.

No the external connection switches the internal temp sensor off and uses the so called external temp which is essentially the internal temp relative to the humidity sensor which is not affected by internal heating
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