If I'm working simplex, I'll usually say something like "WRAF213, on 675" for the main channels, or "WRAF213, on channel 1" for the interstitials. It's a good idea to say which channel you're on so folks using scan will be able to find your transmission easily. On repeaters, I'll include the repeater name/tone when calling someone, otherwise I just drop in my callsign or even just the suffix. If I needed to hear a monologue when someone hops on a repeater, I'd just go back to the WIN System. I hang out on channel 1 a fair bit, but only pipe up to help people who can't get radios talking together; SDR instantly tells me their channel settings, and I only talk to the parents/adults. I scare the crap outta all the kids in a 5 mile radius whenever I get on that channel, though. It's much more fun from hilltops.