Mystery RFI in House

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rwnz

48 posts

Geek

#319342 15-Apr-2025 12:58

My remote controlled blinds and weather station remote sensors have suddenly stopped working and I've used a receiver to determine that there is a strong RF signal around 433.900 Mhz that is blocking them. This happened quite a few weeks ago for a few days but as soon as I figured out the existence of the interfering signal it stopped. By watching the signal strength I've determined that it is coming from around the switchboard. Devices in that area that I've switched off and found they do not stop the interference are (though I expect some don't have transmitters anyway):

PV Inverter
Garage door controller
Video doorbell
Water tank level monitor
EV wall connector

Other electronics in the house are further away.

The only other thing that I can think of in there is the power meter which I'm guessing has a transmitter for remote reading. Any thoughts on this or possible other causes please

richms

28187 posts

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#3364293 15-Apr-2025 13:32

When this happened at a family members place, it was the IR remote repeater that caused it. If a door was open and another glass cabinet was open, then it would reflect one end of it to the other one 2 rooms away and just transmit constantly jamming 433MHz and IR remotes in the room.

Richard rich.ms

rwnz

48 posts

Geek

#3364340 15-Apr-2025 16:21

You must have felt a sense of achievement when that was figured out richms.

I've now figured this one out but don't have that same feeling because I forgot about the La Crosse weather station transmitter on the wall outside the switchboard. It was the culprit, and no great surprise there as a few years ago when the station was quite new the anemometer had done the same thing and stopped our garage door remote from working so that part went in the bin.