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-------- Original message --------From: Patrick Greenlee
<patrick_g@windstream.net> Date: 3/3/19 2:18 PM (GMT-05:00) To:
towertalk@contesting.com Subject: Re: [TowerTalk] WX Sensor Placement Our
master suite is ICF construction so there are two layers of 2 1/4 inches of
Styrofoam separated by 8 inches of steel reinforced concrete in the exterior
walls. This space can be heated with a candle and cooled with an ice cube,
really well insulated and virtually no in/exfiltration. yet an RF linked
outdoor thermometer within a foot of the brick veneer reads 5-10 degrees F
warmer than when placed 10 ft away on cold winter night temps. I was surprised
at the magnitude of the variance but the instruments didn't lie.Wind direction
and speed indications are bogus at best if the measuring instruments are
mounted in poor locations subject to turbulence. I have seen folks mount
anemometers on rooftops and get really erroneous readings. Wind vanes will
point somewhere but not necessarily the wind direction away from aerodynamics
disturbing impediments. Readings taken downwind of a structure (or trees, etc)
need to be taken a minimum of 3 times the widest or tallest dimension of the
obstruction from the obstruction and 7 times is better. I know this is not
good news for folks on moderate sized lots but you can't just ignore physics
because it is inconvenient. Personally, I'd like to be able to suspend gravity
on demand but...Patrick NJ5GOn 3/3/2019 12:54 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> 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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