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
On Sun, Mar 3, 2019 at 2:17 PM Gedas <w8bya@mchsi.com> wrote:
> Very interesting. Can you take a picture of it pse? I would imagine the
> distance from the sensor to the hood makes a difference and what the
> hood is made from. I would imagine white Styrofoam may not be a bad idea
> for a sun shield. Also any height above ground suggestions etc?
>
> Gedas, W8BYA
>
> Gallery at http://w8bya.com
> Light travels faster than sound....
> This is why some people appear bright until you hear them speak.
>
> On 3/3/2019 1:54 PM, George Dubovsky wrote:
> > You pretty much have to avoid the house. As you surmise, even the
> > North side is going to be a heat source or sink. I did not start
> > getting decent readings - ones that compared to Wunderground, etc -
> > until I moved mine to a pagoda (homebrew, made from inverted, stacked
> > dollar-store soup bowls) 75' away from the house.
> >
> > 73,
> >
> > geo - n4ua
> >
> > On Sun, Mar 3, 2019 at 1:38 PM Gedas <w8bya@mchsi.com
> > <mailto:w8bya@mchsi.com>> wrote:
> >
> > This made me wonder about sensor placement. I have had a number of
> > different wx stations and the instructions most provide for the
> > placement of the outdoor temperature sensor is to simply mount it
> > on the
> > north side of the house just under the eaves. This kind of makes
> > sense
> > as it will be away from direct sunlight but what about the heat
> > from the
> > house?
> >
> > How many do this and does it work for you? Do your temperature
> > readings
> > match those or come very close to an "official" local temp like at an
> > airport.
> >
> > Has anyone else noticed just how critical the placement of this
> > sensor
> > really is? I have 2-3 outside sensors in different locations and they
> > all read differently, sometimes as much as a 4F delta. I made sure
> > they
> > were all calibrated inside the house to read the same then installed
> > them outside. Once the sun goes down my readings stabilize and my
> > readings are within a degree of the "official" airport temperatures.
> > During the day, esp summer time the readings can be all over the
> > place.
> >
> > I know enough to keep them out of the sun, away from objects that can
> > absorb & retain heat, off the ground at least 10' or so, not above
> > concrete, etc......and yet I see big differences. So my question is
> > where and how do people mount their temperature sensors?
> >
> > Also does anyone know where and how the "official" temperature
> > sensors
> > used by the NWS are mounted in places like airports?
> >
> > Gedas, W8BYA
> >
> > Gallery at http://w8bya.com
> > Light travels faster than sound....
> > This is why some people appear bright until you hear them speak.
> >
> > On 3/3/2019 1:19 PM, Michael Forinash wrote:
> > > I bought a Davis Weather Station for my wife, who is a
> > Weatherbird, seven years ago. As I recall, it was a six hundred
> > dollar unit. In the past seven years, the only maintenance I have
> > performed on it is remove a seed (from my neighbor’s tree) that
> > blocks the flow of moisture through its self-emptying range gauge.
> > It has a solar panel that recharges the unit’s rechargeable
> > batteries. I have yet to change them.
> > >
> > > The unit is attached to a twelve-foot pole.
> > >
> > > The installation instructions are a little vague on various
> > points, but that’s the only criticism I can make of this package.
> > Not a cheap station, but one my wife has been happy with, as the
> > base unit sits on a end table by her chair in our living room. She
> > checks the base station five or six times a day when she’s not
> > monitoring the Weather Channel or the ND DOT online.
> > >
> > > 73,
> > > Mike
> > > KB0RIA
> > >
> > _______________________________________________
> >
> >
> >
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> >
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