For some years have had Siemens wireless thermostats. The central heating being in 3 zones. Upstairs, downstairs and conservatory. The conservatory being a non-programmable RDH10RF. The house a 1950s three bedroom detached with garage at the side, with an extension behind the garage and the conservatory behind the extension. With a bit of effort you can locate on Google Earth. The C/H boiler is adjacent to the rear of the garage. A couple of years ago, the conservatory thermostat would often loose communication to its receiver located in the garage on the rear wall. Went through the obvious of checking the thermostat battery, OK. Taking the thermostat into the garage where it worked. Since it had worked ok, out it down to it going iffy and replaced it. Soon the same problem again. Now, there is a combined 3G/4G O2 Vodafone mast about 250 metres away, and I know that our house is located slap bang in one of the hot areas - Vodafone kindly sent me a field strength chart. Then realised that the plasterboard wall of the extension - which is between line of site from the thermostat has a foil lining.
Yesterday, fitted a nice new piece of 3187Y through the wall and relocated the receiver. Job done, I thought. Wrong. It's even worse now!
The only two users of around 433 MHz, the frequency of the wireless link, at any decent field strength that I was aware of were the radio amateur 70 cm band and a certain RAF radar station in North Yorkshire whose transmission is centred on 435 MHz. There are no obvious signs, ie a 70 cm aerial in the neighbourhood and we are a fair distance from North Yorkshire. So the question is, why does my PC and/or two displays radiate on 433 MHz. Drat........
At least I now know how to resolve it on a cold night.
Clive
