Sequential call sign overview

As I started my trip down the rabbit hole that is amateur radio, I was confounded by the callsigns. They seemed so random and nonsensical! In case they seem that way to you, too, here’s a quick breakdown:

The International Telecommunications Union (ITU) designates a prefix (or several) for each country. In the United States, we have several: “W”, “K”, “N”, and “AA” through “AL.” The prefix can be one or two letters (ex: “K” or “KN,” “W” or “WA” etc.)

After the prefix is the numerical call district. In the U.S., we have ten call districts, numbered 0 through 9, which correspond to a geographic part of the country. For example, California is call district 6. Here’s the official map, produced by the American Radio Relay League (ARRL):

While call district numbers indicate where the license holder lived when the callsign was issued, we are not required to change call signs when moving. And after getting your first call sign, you can request a change to a “vanity” call, which can be from any call district.

The part after the call district number is the suffix. This is often random, though some hams choose a suffix with personal meaning, like their initials.

There’s a lot of history to radio call signs, which I’ll delve into another time. It’s interesting … if you’re into stuff like that. For now, let’s just get a handle on the basics for practical ham radio use.

Each class of ham radio license is entitled to a different format, and the higher the license class, the shorter the callsign format. I am going to mention two other license classes that we didn’t talk about earlier – Novice and Advanced. Neither of these licenses are issued anymore, but anyone who held one was allowed to keep it. You’ll see them below just for context.

Here’s a quick guide to the shortest callsign formats available to each license class:

Novice: 2×3 (ex: WN6ABC)
Technician: 1×3 (ex: W6ABC)
General: 1×3 (ex: K6KNX)
Advanced: 2×2 (ex: KA6JM)
Extra: 1×2 or 2×1 (ex: K6JM or NG6A)

Though, since the FCC issues callsigns sequentially and does not go backward, all new Technician and General-class licensees are being issued 2×3 call signs, despite there being plenty of 1×3’s available.

Of course, you’re always welcome to request a vanity callsign from any “lower” (or longer format) group, and many hams simply maintain their original callsign.

Vanity call signs

After the FCC issues your initial call sign, you’re welcome to apply for a “vanity” call sign of your choosing. This can be any available call sign from any group that you’re entitled to. So, as a General, I can choose any available 1×3 or 2×3.

How do you find available call signs, you ask? Well, the most accurate way is to search the FCC’s Universal Licensing System (ULS) for possible calls you’re interested it. That’ll tell you pretty definitively if it’s available. There are also a lot of other resources like the AE7Q website or RadioQTH.net. I really like the “available call” feature on RadioQTH (click here), which lets you select a format, prefix, call district, and even partial suffix, and it’ll show you a list of calls that are available now, or in the (semi) near future that match your criteria.

There is a ton more to selecting an amateur radio callsign, but I think that’s enough for now. Delving into ham radio is a lot like trying to drink from a fire hose. Check back later for more on picking a radio and to see how my first forays into the airwaves go.