Re: WS-80 Ultrasonic Wind sensor array

August 25, 2019, 12:36 am

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I have a question for Mandrake.
Are the stations from my attachments yours?
It seems to me that the WS80 detects even low wind speeds that the cup sensor doesn't measure.
Your air pressure measurements are strange. Have you tried calibrating them?

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Re: WS-80 Ultrasonic Wind sensor array

August 25, 2019, 12:45 am

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Quote from: mauro63 on Yesterday at 04:38:16 AM

Quote from: krojan on Yesterday at 04:16:35 AM

Are the WS80 sensor and Davis anemometer too low? It should be 10m (about 33 feet).
Trees that can be seen in the background do not affect wind measurements?

of course, but this is only a first test, at the moment I am interested in evaluating the performance of the solar radiation shield compared to the davis, after the test it will be moved

Mauro

It seemed to me that we are writing here about the ultrasonic anemometer WS80.
We should probably start a separate thread about the effectiveness of the sun visor.

Re: WS-80 Ultrasonic Wind sensor array

August 25, 2019, 4:34 am

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Quote from: krojan on Today at 03:36:14 AM

I have a question for Mandrake.
Are the stations from my attachments yours?
It seems to me that the WS80 detects even low wind speeds that the cup sensor doesn't measure.
Your air pressure measurements are strange. Have you tried calibrating them?

Correct those are my 3.
The Barometer readings for the 3 need to be looked at as I might have mucked up the calibration (very probably)
The station reporting as Gw-1000 Mark2 is the one using the WS-80 as you have probably guessed.

Correct on the WS-80 low wind speed detection. The fidelity is very impressive. It is very calm here at the moment with a small heat induced breeze. The traditional wind anemometer is barely moving yet the WS-80 is happy recording wind speeds up to 2 mph when the other record zero. However I don't have a calibrated wind speed meter so I cannot say if one is better than the other though I would have to guess and say it has got to be the WS-80 since the old anemometer does not seem to allow for the latency in its speed measurements.

Re: PM2.5 Mounting

August 25, 2019, 7:42 am

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Quote from: ALEEF02 on Today at 01:19:37 AM

Quote from: Weatheroger on Yesterday at 10:21:54 PM

I am given to understand it is not necessarily the sensor gets wet is the issue, high humidity is the issue. Micro water drops form and the unit counts them as particulates. Mine is mounted on the top of a 4x4 in direct sun.

Also, I just looked at your ambient weather dashboard. How did you get that sun and moon tile?

Edit your device in Ambientweather.net and add your location. Then sun/moon tile will show up automatically. This is a new feature.

Re: PM2.5 Mounting

August 25, 2019, 7:59 am

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Quote from: ALEEF02 on Today at 12:27:12 AM

Quote from: Weatheroger on Yesterday at 10:21:54 PM

I am given to understand it is not necessarily the sensor gets wet is the issue, high humidity is the issue. Micro water drops form and the unit counts them as particulates. Mine is mounted on the top of a 4x4 in direct sun.

Can I see a picture of your set up?

The sensor is mounted to the top of a 4x4 fence post in direct sunlight.

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 4:02 pm

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Quote from: the beteljuice on Today at 06:52:58 PM

Seems to be plenty of space in the case, why not just double the length ?

At 915 MHz the optimum length is 78mm, 3.07"

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 4:04 pm

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Quote from: the beteljuice on Today at 06:52:58 PM

Seems to be plenty of space in the case, why not just double the length ?

If I recall back in my CB days, this is the way to go as it's a more efficient wavelength of antenna (i.e. making a 1/4 wave to a 1/2 wave).

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 4:10 pm

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An external center-fed half-wave antenna would be more efficient, but it's no longer a ten minute project.

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Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 4:11 pm

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Quote from: CW2274 on Today at 07:04:37 PM

Quote from: the beteljuice on Today at 06:52:58 PM

Seems to be plenty of space in the case, why not just double the length ?

If I recall back in my CB days, this is the way to go as it's a more efficient wavelength of antenna (i.e. making a 1/4 wave to a 1/2 wave).

Additionally, having the antenna "bend over" 90-degrees is a 'quick & dirty' way of compensating for slight differences in antenna polarization's, ie: something between vertical and horizontal.

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 4:16 pm

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Quote from: WA4OPQ on Today at 07:02:45 PM

Quote from: the beteljuice on Today at 06:52:58 PM

Seems to be plenty of space in the case, why not just double the length ?

At 915 MHz the optimum length is 78mm, 3.07"

At quarter wave.

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 5:45 pm

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You could probably create a dipole by soldering on another equal length antenna wire to the ground point closest to the antenna point and have it point in the opposite direction (down). A dipole antenna increases the gain.

I can't tell from the pictures but is the black wire possibly already there acting as the dipole?

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 6:02 pm

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The red wire is a 1/4 wave antenna using the circuit board as a ground plane, similar to an antenna sticking up in the center of the roof of a car.
A 1/2 wave dipole is fed at the center, so it would involve running small coax from the circuit board out to the insulated center of a 6.14" piece of wire.

I chose the simplest solution. If I still needed more gain I'd add a yagi to the array. Which I may still do.

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 7:21 pm

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Did this change the rssi indication ("number of bars") on the console?

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 7:46 pm

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Quote from: WSWeather on Yesterday at 10:21:24 PM

Did this change the rssi indication ("number of bars") on the console?

It went from 3-4 bars to 5.

Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 7:51 pm

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Is the transmitter vertically or horizontally polarized?

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Re: Increase your 2902 range in ten minutes, at no cost

August 25, 2019, 8:19 pm

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Quote from: DaleReid on Yesterday at 10:51:16 PM

Is the transmitter vertically or horizontally polarized?

The antenna in the array is vertically polarized.  It's been helically shortened.

Ecowitt GW1000 differences to WS2000 so far

August 26, 2019, 6:16 am

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Hello Ecowitt, I recently purchased a GW-1000 to supplement the ambient weather WS2000, and I had a few questions.

1)   Wind speed. I cannot find the correct gain factor for the wind. When I put in 0.51 on the WS app, it doesn’t matchup perfectly to the WS2000. I’ve put it lower, but then the average is different. What is the proper wind gain to use for the Osprey WH65B?

2)   Rain gain. I think I figured this one out, but wanted to confirm. Is the correct gain 0.85? Seems like it’s close enough. When I calculated it as 0.254/0.3, it comes out as 0.8466667.

3)   Daily rain cleared at 7AM the next day instead of at midnight. This was on ecowitt.net.  Maybe a timezone thing? It should clear at midnight.

4)   For the WH31 sensors, the ambient site has a “feels like” calculation factoring in temp and humidity, and I think that should be incorporated into the Ecowitt site. Is this possible?


Thanks,
Jeremy

Re: Ecowitt GW1000 and Ecowitt.net configuration questions

August 26, 2019, 6:38 am

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Not sure why you ventured to change those Gain settings. The default work for most people. If you mess with this then you'd better know what you are doing. On that calibration screen the only settings most people need to deal with is Absolute and Relative Pressure that is a must, and then optionally maybe you want to fine tune temperature/humidity if you have a more trusted calibration device.

Quote from: Circle C Weather on Today at 09:16:39 AM

Hello Ecowitt, I recently purchased a GW-1000 to supplement the ambient weather WS2000, and I had a few questions.

1)   Wind speed. I cannot find the correct gain factor for the wind. When I put in 0.51 on the WS app, it doesn’t matchup perfectly to the WS2000. I’ve put it lower, but then the average is different. What is the proper wind gain to use for the Osprey WH65B?

Wind Gain: 1.0

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2)   Rain gain. I think I figured this one out, but wanted to confirm. Is the correct gain 0.85? Seems like it’s close enough. When I calculated it as 0.254/0.3, it comes out as 0.8466667.

Rain Gain: 1.0

Quote

3)   Daily rain cleared at 7AM the next day instead of at midnight. This was on ecowitt.net.  Maybe a timezone thing? It should clear at midnight.

On Ecowitt.net go to Menu / Device / Edit (pencil icon) / change time zone and location

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4)   For the WH31 sensors, the ambient site has a “feels like” calculation factoring in temp and humidity, and I think that should be incorporated into the Ecowitt site. Is this possible?

Although Ambientweather.net shows Feels Like for WH31 sensor I suspect that Ecowitt.net will also if the temperature is greater than 80°F. Below that temperature the Feels Like is the same as the sensor temperature. I'm not certain this is the case but if you want find out for sure or make a suggestion then you should email them directly. Although they sometimes frequent this forum it isn't a routine thing and this post of yours may get missed even if they venture in.

Re: Ecowitt GW1000 and Ecowitt.net configuration questions

August 26, 2019, 6:50 am

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This thread title is incorrect for the matters that you ask. The comments you bring up have nothing to do with differences between the GW1000 and the WS-2000. I suggest you rename the original post with the subject "Ecowitt GW1000 and Ecowitt.net configuration questions." There is only one point in your post that actually deals with a difference....and that was the question about Feels Like and it is a difference between Ecowitt.net and Ambientweather.net ...not a difference in the GW1000 and the WS-2000.

Ecowitt GW1000 and Ecowitt.net configuration questions

August 26, 2019, 6:56 am

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galfert, i've changed the post name. See below for my responses...I have also sent ecowitt customer service a note.

1) Wind. I noticed the wind gusts/speeds reported by the GW1000 were almost double those reported by the WS2000. The minimum gust increment was 2.5mph on the GW1000 vs 1.1mph on the WS2000. I also saw that it was a difference in sensor suite type from WH24 to WH65B on an old internet post, and they said the gain should be 0.51. That gets close to what I'm finding. I still can't dial in the gain perfectly to match the two systems.

2) rain. In the same post on sensor suite types, they said one tip is 0.3mm on the old suite vs 1/100 inch (0.254 mm) on the new one. This ratio is 0.846667. Sure enough, when I did a tip test, the WS2000 registered 0.26 inches of rain while the GW registered 0.31 inches. Almost exactly this ratio. I've put 0.85 in the gain for rain based on this test.

3) time zone is already set to central time with daylight savings clicked. This doesn't explain the 7AM rain reset.

4) ecowitt.net does not show feels like for the remote WH31 sensors regardless of the temp/humidity conditions. It didn't show a feels like in my attic at 118 degrees F.