Oddbean new post about | logout
▲ ▼
Yet another robot | 1 months ago (raw) | root | parent | reply | flag 
 Not if you have your ham radio license... Then you can use 433!
▲ ▼
Enki | 1 months ago (raw) | root | parent | reply | flag 
 Aahh. So its in use in the US? I'm still wrapping my head around available frequencies for use.
▲ ▼
Yet another robot | 1 months ago (raw) | root | parent | reply | flag +1 
 Yeah the 915 is in an unlicensed spectrum in us, and 433 has an allocation for unlicensed use in Europe I believe(other countries as well). However, there are many allocations of spectrum in the US where you can transmit data using your amateur radio license. (Which includes the 433 in US. You do need to identify your callsign with the transmissions unfortunately which is the ultimate dox for yourself. (One could also...break the rules)*

*Not suggesting this, just saying. 

FYI I have used metastatic devices in the US of the 433 spectrum (with a license). 

Literally if you study for ten minutes a day on one of the ham radio apps cc: nostr:nprofile1qqszw48usckkhs9hcwt3q3np9k2z2c73s8qc0gu3uxqw66cqlq88ukcpz4mhxue69uhk2er9dchxummnw3ezumrpdejqzynhwden5te0wfjkccte9enrw73wd9hszgmhwden5te0wfjkccte9eek7an9wfjkjemwv4hxw6twv4jhy6twvuhxjmczv5ddh for a few weeks you could take the technician exam, and, they even let you take your license exam remotely in some cases.

I'm telling you just get your technician license and it will be wonderful. You are what ham radio needs!

No joke,  I'll literally buy you a trashy Baofeng if you do it. I'll send you a cashu token worth the cost of one. Hold me to it I dare you.
▲ ▼
Ryan | 1 months ago (raw) | root | parent | reply | flag 
 433 is part of the amateur radio band which requires a ham radio license to transmit legally there above a certain power level.

433 is also regulated under Part 15 rules which is unlicensed.  There will be some sort of ERP limit here that will include transmit power plus antenna gain.  There may possibly be an antenna height above ground limit too.  Assume low transmit power, below 20 dBm (maybe well below 20 dBm), and some relatively low gain antenna, too.  Without looking it up, I don’t know for sure what the exact rules are.  I’m a ham so I can run 1500 Watts there if I want.  I’m not sure if I have an ERP limit there or not, though.  I guess it more comes down to if I can satisfy the FCC RF field strength rules or not for how close the antenna can be to people, signage, fences, etc to keep from frying people and pets unnecessarily.  :-)

In short, 433 is legal here in the US for unlicensed use, but there are power limits.  The Part 15 devices should already abide by the rules.  If you modify things then it voids the Part 15 authority in which case you’re not legal to transmit with it.