ok so i just got my technician license last month and ive been trying to use the local FM repeaters but i keep hearing people talk but when i transmit nobody seems to hear me. i looked up the repeater info on repeaterbook and i see there's an offset and something called a CTCSS tone listed, like 100.0 hz or whatever. my radio is a baofeng uv-5r and i think i set the frequency right but im not sure if i set the tone correctly or if its even on at all.

can somebody explain what the tone actually does and why repeaters need it? like is it just to keep the repeater from opening up on noise or is there more to it? and how do i know if my radio is actually transmitting the tone vs just not doing it. also is there a difference between CTCSS and DCS because i see both mentioned sometimes and honestly its a bit confusing

sorry if this is a dumb question, still figuring all this stuff out

not a dumb question at all, everyone goes through this. so the short version is CTCSS is a subaudible tone your radio transmits along with your voice — you cant hear it but the repeater's receiver is listening for it. if the repeater doesn't hear that specific tone it just ignores your signal, which is exactly what you're experiencing. it was originally designed to prevent the repeater from keying up on noise or interference from other signals on the same frequency, but yeah there's sometimes also a social element where a repeater club uses it to keep casual passers-through from just randomly using their machine.

DCS is a different system, it uses a digital code instead of an audio tone but serves basically the same purpose. most of the time around here you'll see CTCSS, DCS is less common on local repeaters but not rare either.

for your baofeng specifically you want to go into the menu and find the T-CTCS setting (that's for transmit tone) and make sure it matches what repeaterbook shows for that repeater. there's also an R-CTCS for receive but you usually dont need to set that unless you specifically want to squelch incoming signals. just double check youre setting the transmit one. once you get that sorted it should open right up. good luck

yeah what he said, the baofeng menu is a little weird about it so make sure you actually saved the setting after you changed it. i made that mistake like three times when i was starting out lol. press menu again after you select the tone value or it just reverts. also worth programming it with chirp if you havent already, way easier to see everything laid out than scrolling through menus on the radio itself