I recently became aware of the specification, for a protocol operating in a channelized allocation at 433Mhz, right there in the 70cm amateur band. Apparently, it's been around for a while, for example is from 2014.Looking at I see a allocations overlaying 2M and everything above 470Mhz as well. It's power, mode, and duration limited, so I suppose it isn't a big issue, but as with all other things, there'll be bad actors ignoring such things. I came across a discussion thread, for example, about somebody transmitting at 433 using a Baofeng.
I'm wondering how much of the QRM I encounter when operating mobile is due to this. I wouldn't be surprised to find the limits are being ignored in all manner of COTS equipment.
One application is for vehicle RKS fobs (remote start, etc.) which operate at either 315 or 433Mhz, depending upon (sorta) country of manufacture or company location.
