Does anyone have knowledge or experience of the little weather stations that transmit to the indoor unit? I have one here that transmits continuously on 868.3MHz which seems odd because I'd expect it to run the battery down (and the thing is meant to be high up so changing the battery is a nuisance.) Also the base unit doesn't find it when it scans for it. Ideas anyone?
The unit I have belongs to a neighbour and he has lost the instructions.
Bill
Not continuous Bill, about once a minute or so - usually indicated by a LED on the unit. As the Tx power is microwatts the battery lasts for ages, even moreso if you fit lithiums.
Of course in the 800MHz band the Rx could be suffer 4G RFI?
What make and model? Most of them post the instructions on their website.
At the risk of hi-jacking this thread, I have a Maplin weather station. Worked perfectly with an XP computer but the software does not run on Win7. The base station worked until the batteries ran flat (after about
3 years) AFAIK the transmitter is still working although the battery life for both units was abour 6-9monthts (AA alkaline). Has anyone any experuience of this unit (original cost about £100 almost 3 years ago)Malcolm
Malcolm Race scribbled
Try this
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In message , Bill Wright writes
You might do better to ask on uk.sci.weather
Ih it's any help, it's thundering and lightning in N Manchester.
I've found with mine, which is an Oregon Scientific, that it helps (may even be necessary) to put the transmitter and receiver close together after replacing the batteries and to reset both by poking them with a paper clip in the appropriate holes.
Then you can wait in comfort while they hook up.
We've had some spectaular stuff here over the last hour and as I type our ordinary bridge camber nearly level road outside if just awash side to side. A Tiguan just went by pushing a wash-wave up over its bonnet!
No, it's continuous. The LED stays on all the time and the carrier is there all the time.
As the Tx power is microwatts the battery lasts for
I checked around 868 and there's nothing in the area.
Bill
I'll find out.
Bill
Ohh that's a thought.
What are they like on there? A bit unpredictable, sometimes blowing hot, sometimes blowing cold? Will they give me a frosty reception and pour cold water on my request, or will they hail me as new member of the group? Anyway I'll give it a try. Snow good debating about it is it?
Bill
Even in 'compatibility mode'? Google Win7 compatibility mode.
The base station worked until the batteries ran flat (after about
Often with these devices both the transmitter and receiver need to be reset after a battery change. The reset button is just a small hole in the case that is big enough for a unfolded paper clip (or similar) Often the reset has to be held of a number of seconds.
From memory, it has a receiver on all the time and only sends data when requested. Are you sure its meant to be continuously on? as you say, it sounds a bit wasteful. Brian
It sounds like its bust if its on all the time, at least that is what I remember I never did find them very reliable. And now I'd need a talking one. Can you imagine how annoying that could be? Brian
Yes, I suffered a talking alarm clock which I believe was made from the Red Dwarf toaster! The shocking experience has never left me.
In message , Brian-Gaff writes
My Mum has a talking clock, which is a bit loud, but she loves it. One tap and it tells the time, two taps and I think it recites time, day and date.
Mum is not blind, but, at 91, struggles to see a clock, particularly at a glance, and finds just tapping the box much quicker and easier.
Devices on the 868.0 to 868.6 band are limited to 25mW ERP and, unless they use sophisticated anti-interference measures (presumably meaning they have to actively monitor the frequency), are limited to a duty cycle of 1% or less.
That means the average ERP is 250 micro-watts, at the legal limit. Whilst ERP depends on the aerial, as a rough estimate, that amounts to about 500 microwatts into the transmitter, so, for a single cell you are talking of lifetimes of the order of 1000 hours attributable the actual transmission.
Source IR 2030 .
I'm pretty sure the ones that I had experience of (Oregon Scientific, I think) did power saving on the receiver as well, by only powering it up when a transmission was due. You needed to get the timing in sync after replacing batteries.
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