Note that Davis Instruments offers a "24-Hour Fan-Aspirated Radiation
Shield." Its fan runs on a solar panel during the day while charging two
NiCd C-cells, and then on the C-cells overnight. The temperature and
humidity sensors are located near the center of the radiation shield,
which consists of a stack of plastic ring louvers, quite similar to what
George describes.
Larry W6FUB
On 3/3/2019 11:40 AM, George Dubovsky wrote:
Gedas,
Imagine a stack of upside-down, white plastic bowls (about 7" dia, quite
thin due to their dollar store origins), spaced from each other by a
repeating triangle configuration of 1-1/2 inch or so aluminum spacers. The
top 2 bowls are solid, but the bottom 3 bowls have a 2 or 2-1/2 inch
diameter hole up through the center where the Davis temp/humidity module
resides. Air can flow through it, but it's pretty much protected from rain
and sun. Somehow I affixed a pvc pipe fitting on the bottom and it's about
head height out at the edge of the woods. After some sort of wind-blown
debris smashed the top bowl, I added a round aluminum plate to the top on
short spacers. It's raining here or I'd go out and take a picture.
73,
geo - n4ua...
--
Best wishes,
Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
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