Originally Posted by KC8ESL
Aren't there neighborhood systems for gas meter reporting and such?
Yep, as well as Davis wireless weather stations and cordless phones as someone mentioned.
There are a actually a ton of things that use the 902 - 928 MHz ISM band.
Many also use a form of frequency hopping which could be what the OP is seeing as the device cycles through its available frequencies.
The band is also shared with the amateur radio service.
We have a lightning detection system that uses frequency hopping data radios in this band to send the sensor data back to a display console.
I think the license free radios can have up to 1 watt of output power.
Plus they allow external and directional antennas which can offer 20 or more miles of line of sight range on the license free data radios with the proper antennas. I think the license free data radios must use a frequency hopping spread spectrum type scheme in order to allow external antennas and the 1 watt of power output. That is to minimize interference to licensed users of the band if I'm not mistaken.
Other devices like cordless phones could be single channel analog but they did not allow much RF power and no external antennas.
Then you have the original users of the band which includes many devices in hospitals for patient monitoring as well as industrial and scientific users.
Many of those users had licenses but not sure what the requirements are these days.
I think amateur use is secondary to licensed users of the ISM band.