We all see devices on 310 and 433MHz, sso I decided to look it up. I'm iin the US, so I checked FCC rules (CFR47), and read parts 2, 15 (radio frequency devices), 74 (experimental), and 97 (ham radio). Couldn't find anything specific to these frequencies.
Are these frequencies specifically mentioned anywhere?
I'm in the middle of trying to understand this very thing.
I need a RF circuit to control a Circuit eric helped me build. But, I'm afraid to operate it because I have a room that's nearby and I will need to separate them somehow. Maybe throw in some dip switches ? With separate frequencies.
I assume you mean that you have two different systems and dont want them to interfere with each other.
You could use two different frequencies, or, you could use the same frequency but code the messages to each system so that they only respond to their messages.
I expected to find it in Part 15, and decided to expand my search. In fact I searched the FCC web site, including all of CFR47 for instances of "310" and "433". In fact, 433 MHz is in the middle of the 70cm ham band (420-450 MHz) here in the US. Incidentally, 420-430 MHz is restricted in the US near Canada, because in Canada it's Land Mobile, not ham.
I had read all that, but your interpretations make it more understandable. If you want a pdf of most any regulation, e.g. part 15, search using this: "47cfr15.pdf".
Interesting that only the "frequency" near the center of each rather fat band is defined by manufacturers as the frequency they use. Actually not surprising given that the transmitters are typically LC tuned and the receivers are broad.