[breaking] fix EU433 LoRa definitions

[andrekir]

EN300220 ETSI V3.2.1 [Table B.1, Item H, p. 21]

[andrekir]

marking as draft since changing the start frequency will likely break backwards compatibility. other regions using 433.0f should also be reviewed.

[caveman99]

I am not sure this is necccessary, at least i recall similar discussions a while ago. Seems like ETSI specifies center frequencies with a bit of guard to allow for the bandwidth. The matching ITU allocations start and end at the band boundaries and Meshtastic takes that into account when calculating the center frequencies. Let's follow this up on #frequency-bands in discord.

[andrekir]

no rush, leaving as a reminder for the next breaking cycle.

considering convention and even EU_868, it's pretty safe to say 433,050 MHz to 434,790 MHz is the proper frequency range for EU_433.

[mc-hamster]

Good eye @andrekir !

[S5NC]

10 dBm ERP is 12.15 dBm EIRP, which form of radiated power are we using? If we assume a 0 dBi antenna, it should be the latter.