X10 Wireless - RF Protocol

I've used X10 for two decades. They are fairly cool, to me, and I much prefer them over the newer stuff (IoT).

I have the little injector box for sending my own signals over the power lines, and did a few school projects with it, but, for the mos part, I just used the stock X10 modules. One thing I'd like is my own security system. Maybe one day I'll do a ZigBee system. But for now, lets see if we can do something with what we have.

This site interested me.

• X10 RF Data Format

It listed the carrier at 300MHz. I've seen 310MHz quoted, too. So, lets figure it out!

The easy way is a frequency counter, but I don't have one that goes over 4MHz.. So, lets use cheap SDR!

We can see it transmitting around 310.3MHz, but it can also be seen walking around a bit. Using SDR#, that is a problem, but, not with a cheap receiver. It's a 315MHz model, but it looks like it can be slightly tuned.