We image hydrogen which has a precessional frequency of 42*3MHz at 3T (though most ‘3T’ MR scanners seem to be more like 2.8-2.9T).
So they must use something at around that frequency. All I know for sure is that we got asked to stop blasting that RF out. Sometimes it is convenient to open the scan door while imaging.
I'm unsure why the FCC wouldn't be the ones to complain; but i've never managed to annoy a government with my radio-work yet, so i am not sure who calls who to send someone to knock on the door.
either way https://www.ntia.gov/sites/default/files/publications/januar...
also i only glanced the the US band plans, if this setup isn't in the US, then you'd have to find the relevant band plan for your area (although the US band plan for HF will be fairly accurate, HF is hemispherical on a bad day and global on a good day)
Are you mentioned - US only.
I’m in New Zealand.
as far as why the coast guard, that's a dive too deep for me today. Interesting story, though, on your part!
