I'm not sure that's true about the wind. I have a Davis Vantage Vue. The remote
unit does some processing to generate a 2 s mean speed and a peak gust value
within the 2 s window. Data are then sent in packets every 2 s to the base
unit.
Mine is up 10 m (a WMO standard height). During calm winters nights it will
measure an anomalously high minimum temperature. The anemometer is shielded a
bit by the tower structure when it's downwind of the tower and so the wind
speed is biased low. Direction appears unaffected.
The rain gauge is a tipping spoon with a 3" diameter catchment. It under
samples only at high rain rates. The temperature sensor and dew cell are not
aspirated in this unit and so temperature is biased a bit high due to radiation
errors on calm, clear Summer days.
I highly recommend any of the Davis units, but the Peet Bros. Ultimeter 2100 is
also a very fine unit. Both are comparable in price (~$400).
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Apr 27, 2014, at 18:29, "tomkd8deg" <kd8deg@centurytel.net> wrote:
>
> The Davis wired version, which I am using, has a 4 second delay for wind,
> and direction display. That can mean the loss of 10 to 20 mph in a gust
> situation.
>
> Tom KD8DEG
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of EZ
> Rhino
> Sent: Sunday, April 27, 2014 4:10 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Wired Anemometer for Tower?
>
> I should mention one other thing about the "cheap" weather station
> anemometers that drive me crazy. The first WX station I had only updated
> the wind speed about every minute. The LaCrosse updates about every 12
> seconds. This is almost worthless...I want to know the wind speed NOW! The
> stuff from Inspeed is real time, very nice.
>
> Chris
> KF7P
>
>
>
>
>
>
> On Apr 27, 2014, at 14:03 , Roger (K8RI) on TT wrote:
>
> On 4/27/2014 3:15 PM, EZ Rhino wrote:
>> I have tried a few different weather stations, so I can unequivocally tell
> you what NOT to get.
>>
>> DON'T buy anything under $300. *sigh*
>
> Mine cost 40 something, works fine, is made of cheap plastic. Uses plain old
> Duracell non rechargeable. Last 2 years or more outside. The ones indoors
> only last 6 mo to a year. Probably cost twice that much now...if available
>
> Mounted on the tower where I can just reach it with an 8' stepladder.
>
> Does nothing except report wind speed, direction,temp, humidity, and
> relative temp.
>
> 73
>
> Roger(K8RI)
>
>>
>> Unfortunately the cheap ones are total garbage. The recent one I got is a
> LaCrosse station, purchased from Costco. Junk! Junky cheap plastic, the
> rechargeable batteries in the solar powered wireless anenmometer/wind vane
> unit went bad in the first year, and the rain bucket stopped working in the
> first few months after purchase.
>>
>> The Davis units are good, have a buddy with one and it is quality stuff.
> And about $300. You pay for what you get. I agree, I think the wired units
> are more reliable and last longer.
>>
>> Ok now take a look here: www.inspeed.com These guys make anemometers
> that are decent quality and not expensive. They also have a cool computer
> hookup version that allows your PC to track all the data and put it in a
> spreadsheet. AND it has the wind switch option, where you can program the
> system to turn an appliance on or off (read: lower your tower!) if the wind
> goes above a preprogrammed speed. Pretty neat. I don't have this option
> yet. I think AB7E has one of the inspeed units too, maybe he can provide
> some feedback.
>>
>> Chris
>> KF7P
>>
>>
>>
>>
>>
>>
>>
>> On Apr 27, 2014, at 11:01 , Steve Jones wrote:
>>
>> Can any of you recommend a wired anemometer or weather station unit?
>>
>> I want to install an anemometer to monitor the wind speed at the top
>> of my tower. All I can find online are wireless units. On this
>> reflector I have seen a number of bad reviews of wireless weather
>> sensors, because their little wifi transceivers get damaged by the RF
>> from a ham antenna. I have a spare CAT5 cable at the base of the tower
> available.
>>
>> 73,
>>
>> Steve
>> N6SJ
>>
>>
>> _______________________________________________
>>
>>
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