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At work, we are in an industrial area, and there is always a signal that I receive inside my office which interferences with my tests.

This signal is in the 433 MHz and when I see the spectrum, there are 2 peaks around this center frequency which are shown sort of constantly pulsing, like if someone were pressing a button every 5 seconds (but this is a 24h interference, so it must be something else).

Also, because of the strength of this signal, I wonder if it's something inside my office but we only have routers, wireless phones...I can't think of any wireless device inside my office that could be transmitting at this frequency.

I only can thing about the garage door openers but, as this interference is constantly there, it must be something else.

What sort of device could be doing this?

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    $\begingroup$ "At work, we are in an industrial area...", it might be carrying sensor data or be something entirely custom. Is it possible to post what the spectrum looks like around that frequency? $\endgroup$
    – A_A
    Jun 21, 2018 at 8:38
  • $\begingroup$ I read about it and I found out that it could be our alarm system because the power is high and the transmission is constant so I run the technical support and they confirm, so I guess, problem solved? $\endgroup$
    – Natalia Molinero Mingorance
    Jun 21, 2018 at 11:02
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    $\begingroup$ Then, could I please ask you to delete the question if you think that there is no reason to stand anymore, or, to self-answer the question and accept it too, so that this question is closed and does not circulate the board as "unanswered"? $\endgroup$
    – A_A
    Jun 21, 2018 at 11:19

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I read about it and I found out that it could be our alarm system because the power is high and the transmission is constant so I run the technical support and they confirm, so I guess, problem solved.

However, if someone else had the same issue and found that it was something else, please share :) I read it could be also the thermostat but couldn't find the specs of ours and unless it transmits also when it's not working, I don't think it could be that!

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