On the air: choosing a frequency, calling CQ, and working a repeater

Concept

Everything before this point has been about what your license permits and what the words mean. This is where that turns into actually talking to somebody. Your license doesn't come with a schedule of which precise frequency other hams happen to be listening on right now — the FCC hands out a broad slice of spectrum, and it's operators themselves, informally, who've agreed on where within that slice to gather for a given purpose. That informal, opt-in agreement is called a band plan: a shared custom for which activity tends to live where, layered on top of — never instead of — whatever your license already permits. The best-known example on 2 meters is 146.520 MHz: the specific spot the community has settled on for finding someone to talk to without going through a repeater at all. Turn a 2-meter handheld to that one number, and by long-standing custom alone, you're on the same channel as everyone else doing exactly the same thing.

Concept

Most of your early contacts on VHF and UHF, though, won't be direct — they'll go through a repeater, a station usually sitting on a tower or hilltop that picks up a weak signal on one frequency and instantly re-transmits it on a second, turning a handheld's few miles of range into a whole region. That gap between the two, the frequency you receive on and the frequency you transmit on, is what hams call the offset, and any radio working through a repeater has to be told what that gap is before it can hold up its end of the conversation. On 2 meters, convention has settled the gap at 600 kHz either direction from the repeater's listed frequency; on 70 centimeters, the accepted gap jumps to a much wider 5 MHz. Get the direction or size of that gap wrong and your handheld will transmit into empty air while still receiving the repeater perfectly — you'll hear everything and wonder why nobody ever answers you. Two stations talking directly to each other, with no repeater in the middle, share one single frequency for both transmitting and receiving — hams call that arrangement simplex, and it's exactly what's happening at 146.520 MHz. A repeater can't operate that way; a single channel can't carry a signal in and a signal out at the same instant without the radio deafening itself, which is the entire reason the offset exists in the first place.

Concept

CQ is ham shorthand for calling any station — you're not naming anyone, you're broadcasting an open invitation into the ether. The customary way to send that invitation, when you don't have a specific contact in mind and you're not routing through a repeater, is to key up, send "CQ" two or three times, follow it with "this is" plus your own call sign, and then release the mic long enough to actually listen for a reply before you try again. Your very first transmissions might just be quick tests to make sure the rig is working at all, but the moment you're ready to reach an actual person, this handful of words is the whole ritual.

Concept

If somebody else's CQ reaches you first, courtesy runs in the other direction: you open with their call sign, so they know specifically that you heard them, and close with your own so they know exactly who answered. Already working a repeater and you know exactly who you're trying to reach? Skip the general call entirely — just send their call sign, then identify yourself with yours, the same short back-and-forth you'd use walking up to someone you already know by name. And if you're simply parked on a repeater hoping someone stumbles onto you, the customary phrase is your own call sign followed by the single word "listening" — not a CQ, not silence, a specific idiom every regular on that repeater will recognize on sight.