so i've been licensed about 4 months and i notice some guys on my local repeater just say their callsign normally and some spell it out with phonetics every single time. like one guy always goes "whiskey five tango romeo" or whatever and another just rattles it off like a regular word. is there a rule about this or is it just preference? i feel kinda dumb asking but i dont want to be doing it wrong when i finally get on HF. also does it matter if you use the nato ones vs just making up your own like saying apple instead of alpha or whatever

Good question and yeah there's no hard rule that says you MUST use phonetics every single transmission, it's more situational. On a clear local repeater where everyone knows you, saying your call straight is totally fine. Where phonetics really matter is when conditions are rough — like on HF when there's QSB or QRM and the other station is struggling to copy you. The NATO alphabet exists specifically because those words were chosen to sound distinct even through noise and different accents, which is why using your own made-up ones can backfire. "Apple" and "Alpha" don't sound that different through static but "Alpha" versus something like "Able" which some guys use from the old phonetic alphabet can cause confusion. Just practice the NATO ones until they're automatic and use them whenever there's any doubt the other op might miss a letter.

yeah i went through the same confusion when i started. my elmer told me just learn the nato ones and use them any time you're not 100% sure you're getting through clean. honestly on a local repeater nobody cares but the first time i tried a dx contact on 20m i was really glad i had them down because the guy came back asking me to repeat my call twice and i had to go slow with full phonetics each letter. making up your own is kind of frowned on in most circles from what ive seen, people just expect the standard ones