Also are you able to determine what is said, what they're talking about? How active is the frequency? What times of day is it most active? All of these are good things to take note if you're trying to ID an unknown station. If you stay on the frequency long enough without the DPL programmed in maybe the repeater will ID itself (beep its callsign)? No need to know every letter in morse code but it does help to at least know the numbers, this way if you catch the last few characters (numbers) you can usually rule it out by callsign. Not every repeater IDs regularly (or at all) though. Hope these tips help
Good luck & 73!