Authorized and prohibited transmissions: broadcasting, coded signals, compensation, and selling your gear

Concept

Now that the last lesson pinned down exactly who is legally responsible for a station's transmissions, this one turns to what that control operator is and is not allowed to put on the air. Ordinary two-way contact with another amateur station is the default, and it's open almost everywhere on the planet, with one specific carve-out worth remembering: you may not exchange communications with a country whose government has told the International Telecommunication Union it wants no part of them. Beyond ordinary two-way conversation, a short, specific menu of one-way transmissions is fair game too — brief signals needed to adjust your own station, telecommand and telemetry links, sessions helping someone learn Morse, routine information bulletins, and communications tied to an emergency. What that menu conspicuously leaves off is broadcasting, and that's not an oversight: a station may not engage in broadcasting in any form, and one-way transmission generally stays off the table except for that named list. Broadcasting itself has a plain, testable definition behind it — any transmission meant for the general public to pick up, whether it reaches them straight from your antenna or gets relayed along the way by someone else. Address one specific station or operator and you're doing ordinary amateur radio; aim a signal at whoever happens to be listening, with no particular addressee in mind, and you've stepped into territory this license was never meant to cover.

Part 97: 97.111(a)(1), 97.111(b), 97.113(b), 97.3(a)(10)

Concept

A related restriction covers messages sent specifically to hide their own meaning — codes and ciphers meant to keep a listener from understanding what's actually being said. That's barred outright for ordinary amateur traffic, but the rules carve out exactly two situations where obscured content is legitimate, and both are narrow by design. A station acting as a telecommand station for a space station may transmit special codes intended to obscure the meaning of the commands it sends up to that spacecraft — you don't want a curious listener able to reverse-engineer control commands for an orbiting satellite. Control signals sent to steer a model craft on the ground get treated differently still: those signals simply aren't classified as codes or ciphers meant to obscure anything in the first place, so the general restriction never even reaches them. Everything else — ordinary conversation between two hams, contest exchanges, digital chat — stays in plain, decodable form; there's no third door into obscured traffic beyond those two named exceptions.

Part 97: 97.113(a)(4), 97.211(b), 97.215(b)

Concept

That same core restriction also reaches two more categories outright: indecent or obscene language, and music sent over a phone (voice) emission. Obscene language gets no wiggle room and no vocabulary list to consult — there's no FCC roster of banned words and no ITU list either; the ban is a blanket judgment call, not a checklist to run down. Music is different only in that it has one true escape hatch, and it lives somewhere else entirely: the rule governing retransmission of non-amateur signals. Ordinarily a station may not relay programming that originated outside the amateur service at all — no picking up a commercial station's feed and repeating it out over your own frequency. Two narrow, named exceptions exist: weather and propagation information meant for the general public and originated by a United States government station, and communications — including incidental music — between a crewed spacecraft and its Earth stations, but only with NASA's approval and only as an occasional event, never a standing arrangement. That second exception is the one and only doorway through which music legally rides an amateur phone signal.

Part 97: 97.113(a)(4), 97.113(c)

Concept

The broader idea behind both of this group's remaining topics is that a station licensee or control operator generally can't have a financial stake in what gets transmitted — no running a business over the air. The rules spell out a short list of specific carve-outs to that idea, and two of them matter directly here. First, the one this group is named for: an amateur is free to let other amateurs know that station equipment is up for sale or trade, so long as that notice-posting isn't something done on a regular, ongoing basis — an occasional listing when you're clearing out a closet, not a running want-ads column off the same call sign every week. Second, a different carve-out covers people, not gear: a control operator may accept pay as a routine part of a teaching role, specifically while the station serves classroom teaching duties at a school. Both exceptions share the same shape — a narrow, named activity that doesn't turn the hobby into a paid enterprise, sitting inside a much broader idea that otherwise keeps money out of the picture entirely.

Part 97: 97.113(a)(3)(ii), 97.113(a)(3)(iii)

Concept

One more mechanical piece completes this picture: how a repeater actually gets a signal from a remote receiver site to wherever its transmitter physically sits, often miles apart on separate hilltops. That link runs through what the rules call an auxiliary station, and it's built out of exceptions to two general ideas working together. Normally a station can't automatically pick up and resend another amateur station's signal without a person actively involved — except when that station is functioning as an auxiliary, a repeater, or a space station, all three of which get a specific pass to do exactly that. And an auxiliary station specifically is allowed to send purely one-way traffic, which is precisely the job description of a receiver-to-transmitter link: it never talks back, it only relays forward what it just heard.

Part 97: 97.113(d), 97.201(e)

Concept

There's one more narrow doorway into broadcasting-adjacent territory, and it only opens under real urgency: when no other means of communication is reasonably available, an amateur station may pass safety-critical information to a broadcaster for airing to the public — but only information that's genuinely about protecting someone's life right now or keeping property out of harm's way in that same moment, not routine newsroom content. That's a safety valve for a real emergency, not a general invitation to help gather ordinary footage or run everyday programming. Two identification rules round out this group, and they cut in opposite directions. Making test transmissions on the air — checking that a rig is working, keying up just to listen for your own signal — doesn't excuse you from identifying; a transmitting station still has to give its call sign the same as any other time it's on frequency. Model craft control, on the other hand, is the one situation where identification isn't required at all, provided the transmitter itself carries a label with the station's call sign and the licensee's name and address — the label substitutes for on-air identification because nobody's listening for a call sign on a frequency used only to steer a toy plane or boat.

Part 97: 97.113(b), 97.119(a), 97.215(a)