ok so ive been licensed for about 4 months now and i still get confused about this. like when someone asks for my callsign do i always have to spell it out phonetically or is just saying the letters fine sometimes? i was on a local 2m repeater last week and i just said my call normally and nobody seemed to care but then i tried to make a contact on 40m SSB and the other guy couldnt get my suffix at all and i had to repeat it like three times before i did the phonetic thing and it worked immediately

so is there like a rule about when you have to use them or is it just kind of a feel thing depending on conditions? also i noticed some people use the NATO ones like Alpha Bravo Charlie and some people use totally different words, heard a guy say "Adam" instead of "Alpha" once which threw me off. is that allowed or is there an official standard you're supposed to follow

yeah theres no hard rule that forces you to use phonetics every single time, its more of a practical thing. on a quiet local repeater with good signals its totally fine to just say your letters, everyone can hear you clearly. but once you get into HF with all the QRM and fading and whatever else is going on, phonetics just make the difference between someone copying you on the first pass or not. the 40m thing you described is pretty much exactly the situation they're made for.

as for the Adam vs Alpha thing, technically the ITU standard is the NATO alphabet so Alpha Bravo Charlie etc is what youre supposed to use in international or formal contexts. but in practice a lot of older hams especially in north america grew up using the ARRL phonetics or just whatever their local club used and they never really switched. Adam Baker Charlie David is pretty common if the guy has been licensed since like the 60s or 70s. nobody is going to get on your case for it on a casual qso, but if youre doing anything formal like emcomm or traffic nets they usually want strict NATO phonetics so everybody is on the same page

honestly the moment it clicked for me was when i was trying to work a station in a pileup and kept getting walked on, finally just slowed down and said each letter with a full phonetic word and the dx came back to me first try. thats kind of when i stopped thinking of it as a formality and started thinking of it as just... the tool that actually works lol

the mixed alphabet thing is kind of funny, i still slip up and say "Sugar" instead of "Sierra" sometimes because thats what my elmer taught me back in the day. old habits. most people just roll with it as long as theyre distinct words that cant be confused with anything else