QX-30X tunes into other devices

[adminy]

I've set -R 0 and I'm doing a -X to specify it since QX-30X is the only interesting device for me to send to Mqtt.

I don't know does QX-30X have a protocol number?

I've got 2 inkbird temp sensors (protocol 194)
I can't imagine them being the noise.

So the only other thing that's same frequency around is this 2 way door bell.

So I opened it up and took a look inside.

And it's a bit of trickery there. But I managed to find this little guy.

And searching for the first washed out letters I got this:

https://www.silabs.com/documents/public/data-sheets/Si4438.pdf

The door bell does more than audio over 433, also triggers a separate 433 MHz relay. By the looks of it, it's actively pinging the other side perhaps with some battery information, unclear, because rtl_433 -A is very messy with chunked bits of random data of varying sizes.

The non QX-30X packets send both 24 bit and 25 bit at random, and frequently.

[zuckschwerdt]

Note: this is about the flex decoder https://github.com/merbanan/rtl_433/blob/master/conf/qx-30x.conf

Flex decoder are added at runtime and have no defined protocol number.

There is no audio, right? Tranceiver, but data only? Something like a baby-monitor would jam the channel.

Try to monitor the band with a SDR UI, if it supports rtl_tcp then you can use rtl_433's pass-through: -F rtl_tcp

[adminy]

It sends audio data only when you accept a call.

https://a.aliexpress.com/_EJcio20

I'll check with rtl_tcp in the SDR UI and tell you what I see.