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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4017) - 17 March 2024
Legacy Cumulus 1 release v1.9.4 (build 1099) - 28 November 2014 (a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
WH1081 spares
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WH1081 spares
I have had the WH1081 for a couple of years with no problems until a few days ago. I noticed the outside readings were becoming intermittent and today they have stopped completely. I have checked the transmitter and the red light comes on. I have out new batteries in both units. So any ideas or does anyone know where I can get spares?
- steve
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Re: WH1081 spares
Clas Ohlson sell spares, if you happen to have a shop near you. But I think the Fine Offset hardware experts here might have a few suggestions for you to try first.
Steve
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Re: WH1081 spares
I'm not sure I fit in the "expert" category, but there are a few things you can try. First the basics that you probably already know.
The order of restoring power is important - the sensor unit needs to be powered first, then the display unit. The display unit needs to be disconnected from USB when you pull the batteries to reset it.
Range is very voltage dependent. If you are close to the edge of the range (recogizable from the fact that you will need to change batteries more often), and your new batteries have been on the shelf for awhile, the system may not work. You will want to carry the display unit out near the sensor unit and reset it there to see if things start working.
I'm sure there will be other suggestions if these don't get you going again...
The order of restoring power is important - the sensor unit needs to be powered first, then the display unit. The display unit needs to be disconnected from USB when you pull the batteries to reset it.
Range is very voltage dependent. If you are close to the edge of the range (recogizable from the fact that you will need to change batteries more often), and your new batteries have been on the shelf for awhile, the system may not work. You will want to carry the display unit out near the sensor unit and reset it there to see if things start working.
I'm sure there will be other suggestions if these don't get you going again...
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Re: WH1081 spares
I don't think this has been mentioned before but I think the transmitter signal may be a bit directional. I haven't checked this, I don't have the test equipment required, but the aerial is in the form of an inverted U fed from one end, rather than a simple whip aerial. Maybe one of our radio experts on here knows the directional pattern of this type of aerial - it is not one I have experience of, so I'm guessing.
Gina
Sorry, no banner - weather station out of action. Hoping to be up and running with a new home-made one soon.
Sorry, no banner - weather station out of action. Hoping to be up and running with a new home-made one soon.
- mcrossley
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Re: WH1081 spares
I did wonder about cutting the aerial track and dangling a wire from the transmitter to get rid of the folding. I wondered what length would be optimal?
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Re: WH1081 spares
Ok I have tried resetting and with no success. I have both units together and the light flashes etc but still no readings. Looks like a sensor failure so now on the look out for a cheap replacement.
chrisdunn wrote:I have had the WH1081 for a couple of years with no problems until a few days ago. I noticed the outside readings were becoming intermittent and today they have stopped completely. I have checked the transmitter and the red light comes on. I have out new batteries in both units. So any ideas or does anyone know where I can get spares?
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Re: WH1081 spares
Technically you would be breaking the law if you were to modify either the transmitter or it's aerial. The unit is type approved for use in this country and any modification would void the approval. Not that anyone would know, the range is too short (I didn't say that ) You could improve the receiver aerial, that is not type approved, and you can officially do what you like. The wavelength for a 344MHz is 70cm and as I recall, optimal is half a wavelength. You could even make a higher gain aerial - eg. from a coat hanger.mcrossley wrote:I did wonder about cutting the aerial track and dangling a wire from the transmitter to get rid of the folding. I wondered what length would be optimal?
Gina
Sorry, no banner - weather station out of action. Hoping to be up and running with a new home-made one soon.
Sorry, no banner - weather station out of action. Hoping to be up and running with a new home-made one soon.
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Re: WH1081 spares
Stretching the memory here, but because of propagation delays in wire you need to make things about 5% longer (433 MHz wavelength for a wire antenna is 300/433*1.05=0.727 Meters, or 72.7 cm)Gina wrote:Technically you would be breaking the law if you were to modify either the transmitter or it's aerial. The unit is type approved for use in this country and any modification would void the approval. Not that anyone would know, the range is too short (I didn't say that ) You could improve the receiver aerial, that is not type approved, and you can officially do what you like. The wavelength for a 344MHz is 70cm and as I recall, optimal is half a wavelength. You could even make a higher gain aerial - eg. from a coat hanger.mcrossley wrote:I did wonder about cutting the aerial track and dangling a wire from the transmitter to get rid of the folding. I wondered what length would be optimal?
The problem is that we don't know the impedance of the driver. It might be designed for 1/4 wave (most common) or 1/2 wave, or even some length more related to impedance than resonant lengths. There's a fair amount of analysis required to properly design a better solution, and the odds of making it worse are pretty good. I might be wrong, but I assume the person that designed this did it this way for solid engineering reasons.
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Re: WH1081 spares
Having just seen the latest Maplin 1 day offer I notice that Maplin are now stocking spare parts for the N96FY and N96GY:
Code: N77NF – spare rain gauge
Code: N78NF – spare steel mast tube
Code: N80NF – spare transmitter (including built-in temperature and humidity sensor)
Code: N81NF – spare wind direction sensor
Code: N82NF – spare wind speed sensor
Code: N77NF – spare rain gauge
Code: N78NF – spare steel mast tube
Code: N80NF – spare transmitter (including built-in temperature and humidity sensor)
Code: N81NF – spare wind direction sensor
Code: N82NF – spare wind speed sensor
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Re: WH1081 spares
Actually, if you are fast, you can get a whole B-grade unit (N96GY) for about £45, delivered iirc.
http://www.maplin.co.uk/b-grade-usb-tou ... ter-682792
I bought one and it appears to be indistinguishable from the real thing, at half the price..
http://www.maplin.co.uk/b-grade-usb-tou ... ter-682792
I bought one and it appears to be indistinguishable from the real thing, at half the price..
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Re: WH1081 spares
I ordered the replacement transmitter which failed to talk to the base. Checked with Maplin and was assured it was a 433MHz they have sent a replacement which also does not work so not sure what the problem is. I have 2 base stations and it fails to work on either. Thoughts on a postcard please.
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Re: WH1081 spares
Hi Chris,
There's plenty of discussion about this in the Fine Offset section, for example here.
Cheers, Alan.
There's plenty of discussion about this in the Fine Offset section, for example here.
Cheers, Alan.