FCC Part 97.305 Explained: Authorized Emission Types

FCC Part 97.305 explains which emission types are allowed on specific amateur radio bands and frequency segments. In plain English, this rule tells you what kind of signal you may use, such as voice, CW, image, RTTY, or data, depending on where you are operating.

Which emission types are allowed in amateur radio?

In amateur radio, allowed emission types depend on the band, the frequency segment, and your license privileges. Commonly allowed emissions include CW, phone, image, RTTY, and data, but not every mode is allowed everywhere. Operators must use emission types that are authorized for the specific band segment they are using.

What Is FCC Part 97.305?

FCC Part 97.305 is the rule section that explains what kinds of emissions are permitted on amateur frequencies. It works together with the frequency privilege rules and the emission standard rules.

That means Part 97.305 is not a stand-alone rule. You should read it alongside:

• FCC Part 97.301 – Frequency Privileges
• FCC Part 97.307 – Emission Standards
• FCC Part 97.313 – Power Limits

What Is an Emission Type?

An emission type is simply the kind of radio signal being transmitted. In everyday ham radio language, operators usually think of this as the mode they are using.

Examples include:

• CW – Morse code
• Phone – voice communications, such as SSB, AM, or FM where allowed
• Image – picture-based transmissions such as SSTV or amateur television where allowed
• RTTY – radio teletype style text transmission
• Data – digital communications such as packet, FT8-style signaling, and other digital modes where permitted

How Part 97.305 Works

Part 97.305 organizes authorized emissions by band and segment. That means the FCC does not treat every frequency in amateur radio the same. Some segments are meant for CW and narrow digital work, while others allow voice, image, or broader signals.

This matters because even if you are on a band you are allowed to use, you may still be in the wrong part of that band for the mode you selected.

Common Emission Types Hams Use

These categories are broad. Modern ham radio includes many specific operating modes, but they still fall under these general authorized emission groupings.

For a broader beginner-friendly mode guide, see Ham Radio Modes.

Real-World Operating Examples

Here is how Part 97.305 works in everyday operation:

• A Technician may have access to part of a band, but may still be limited to certain emission types in that segment.
• A General or Extra operator on HF might use CW in one portion of the band and SSB voice in another.
• A digital operator using data modes must still stay in portions of the band where those emissions are authorized.
• An operator transmitting a wide signal in the wrong subband can create interference and violate FCC rules.

Important Limits To Remember

Part 97.305 does not exist by itself. Even if an emission type is authorized, your signal still has to meet the rest of the rules.

• You must stay within your frequency privileges
• Your signal must meet emission standards
• You must follow power limits
• You must avoid causing unnecessary interference under general standards

Why This Rule Matters

Amateur radio bands are shared by many kinds of operators using many different modes. Part 97.305 helps keep those uses organized so narrow signals, voice signals, image transmissions, and digital modes do not all collide in the same places.

This rule also helps protect weak-signal work, improve band organization, and reduce harmful interference.

Frequently Asked Questions

Quick Checklist for Part 97.305

Related FCC Part 97 Guides