Two meanings of “auxiliary communications”
Searches for “auxiliary radio communication system” often mix up two different things.
- ARCS as a building system. This is the most common meaning. It is an in-building radio system used in some jurisdictions, with New York City being a frequently cited example, to help firefighters and other responders communicate inside large buildings.
- Auxiliary communications as a volunteer role. In emergency management, “auxiliary communications” (sometimes shortened to AUXCOMM) generally refers to trained volunteers, including many amateur radio operators, who support public safety communications.
This article explains both so you can tell them apart. ARCS is not an amateur radio service, and it is not something hams operate on ham frequencies.
ARCS as an in-building system
An Auxiliary Radio Communication System is generally described as a dedicated radio system that boosts or carries public safety radio signals inside buildings where concrete, steel and glass block them. Large high-rises, basements and underground structures are typical examples.
Requirements, names and technical details come from local fire and building codes, and they differ between cities. Descriptions of typical components often include:
- A dedicated radio console, commonly in the lobby or fire command center, for responders to use
- A network of antennas or cabling inside the building
- Equipment to carry the signal through the structure
- Backup power, since the system is meant to work during emergencies
Installation, testing and maintenance are normally handled by licensed professionals under the local authority. If you are a building owner or manager, check with your local fire department and code officials for what applies.
How this differs from ham radio
| ARCS (building system) | Amateur radio | |
|---|---|---|
| Who uses it | Responders, on public safety systems | Licensed hobbyists and volunteers |
| Frequencies | Public safety frequencies | Amateur bands |
| Who sets it up | Building owners and licensed contractors | Individual operators and clubs |
| Purpose | In-building coverage for responders | Personal, hobby and volunteer communication |
A ham license does not authorize use of public safety radio systems; our guide to what a US amateur license does and does not cover explains the limits.
Auxiliary communications and amateur radio
Many emergency management agencies use volunteers to supplement official communications. In the United States, the Department of Homeland Security has run an Auxiliary Communications (AUXCOMM) training program aimed at volunteers who support communications during incidents. Requirements and course details change, so check current information from your state or local emergency management office.
For hams, this often connects to groups such as ARES and RACES. Our EMCOMM overview explains these groups, how to join, and what training to consider.
Practical steps for hams interested in this area
- Join a local emergency communications group and attend its meetings and nets.
- Ask your local emergency management agency whether it uses auxiliary communications volunteers and what credentials it requires.
- Take Incident Command System training if your group recommends it.
- Learn the emergency frequencies and local plans your area uses.
Common questions
What is the 3-3-3 rule for radio?
There is no single standard rule by that name. People use “3-3-3” in different contexts, such as survival planning or radio checks. If you meet the term, check its source.
Are the “10 codes” required in emergency communication?
Ten-codes are used by some agencies, but meanings vary between organizations, and many emergency groups, including most amateur emergency nets, recommend plain language instead.
Can a ham use the ARCS in a building?
Not as a ham. ARCS equipment is for responders operating on public safety systems. Hams generally use their own equipment and amateur frequencies.