To operate a Digital Mobile Radio legally in the United States, you need an FCC license, and the DMR license requirements depend on how you plan to use the radio: amateur operators license under Part 97, businesses and organizations license under Part 90, and families who want a simpler option can get a GMRS license under Part 95. The FCC does not issue a license called a “DMR license.” DMR is the digital protocol your equipment uses; the license authorizes you to transmit on specific frequencies, and your radio happens to use DMR on them.
Transmitting without the right authorization exposes you to civil fines of up to $10,000 per violation and seizure of your equipment.
Which License You Actually Need
Start with what you’re going to do on the radio, because that single question decides everything else.
- Personal, experimental, or hobbyist use: amateur radio (Part 97). Requires an exam. $35.
- Business, organizational, or government use: private land mobile radio (Part 90). Requires frequency coordination. $105 application fee plus annual regulatory fees.
- Family and personal use without an exam: GMRS (Part 95). $35, covers your immediate family for 10 years.
One thing worth clearing up early: color codes, talk groups, and time slots are technical settings inside the DMR protocol that organize traffic on a channel. They do not create legal privacy and they do not substitute for a license. If your radio transmits on a frequency, you need authorization to be on that frequency.
The Amateur Route and Its Two Big Limits
Most hobbyists come to DMR through amateur radio. You pass a Technician class exam given by volunteer examiners in your community, then pay a $35 application fee to the FCC.1Federal Communications Commission. Amateur Radio Service2Federal Communications Commission. Personal Service and Amateur Application Fees The exam covers basic electronics, regulations, and operating practices. From Technician you can advance to General or Amateur Extra to unlock more frequencies.
Two restrictions catch new operators off guard. First, you cannot use an amateur license for business. No dispatching employees, no coordinating commercial deliveries, no communications where you or your employer have a financial interest in the outcome.3eCFR. 47 CFR 97.113 – Prohibited Transmissions Second, you cannot encode transmissions to hide their meaning. DMR encryption features have to stay off on amateur frequencies.4eCFR. 47 CFR Part 97 – Amateur Radio Service If you need either capability, Part 90 is your path.
How to Get a Part 90 Business License
Part 90 is for security companies, construction firms, property managers, event coordinators, warehouses, and any employer dispatching workers by radio. More moving parts than amateur licensing, but straightforward if you work through them in order.
Get an FRN
Every applicant creates an account in the FCC’s Commission Registration System (CORES) and obtains a 10-digit FCC Registration Number. The FRN ties to all of your filings, fees, and correspondence with the agency.5Federal Communications Commission. Commission Registration System for the FCC
Get Frequency Coordination
Before you can file, a certified frequency coordinator must review your proposed system to confirm your frequencies won’t interfere with existing users in the area. The FCC requires this step for nearly all Part 90 applications.6eCFR. 47 CFR Part 90 – Private Land Mobile Radio Services Any coordinator certified for your frequency pool will do.7Federal Communications Commission. Industrial/Business Licensing Coordinator fees typically start around $100 and vary with the complexity of your system and location.
The coordinator will need the number of mobile and portable units, the location and antenna height of any base or repeater stations, and the geographic area you plan to cover. Accuracy matters here. If your coordination is based on wrong antenna coordinates, the FCC can return or dismiss the application without refunding your fees.
File Form 601 Through ULS
Form 601 is the FCC’s main application for wireless authorizations.8Federal Communications Commission. FCC Form 601 – Main Form Instructions You’ll specify emission designators that describe the bandwidth and modulation of your equipment. If your antenna structure is taller than 200 feet above ground level or sits near an airport flight path, you’ll also need an Antenna Structure Registration before filing.9Federal Communications Commission. Antenna Structure Registration (ASR) Resources Most rooftop or modest tower setups fall well below that threshold.
With your coordination letter and technical data in hand, file electronically through the FCC’s Universal Licensing System (ULS). Log in with your FRN, open the new license application section, and enter the Form 601 information.10Federal Communications Commission. Applying for a New License in the Universal Licensing System You’ll pay the application fee, then receive a file number to track status. The FCC publishes no standard timeline for Part 90 applications; processing can take anywhere from a few weeks to a few months depending on volume and whether the agency has questions about your filing. Once granted, your authorization appears as an “Active” record in ULS and can be printed from the system.
What a License Costs
Fees under the schedule effective May 2025:2Federal Communications Commission. Personal Service and Amateur Application Fees11Federal Communications Commission. Site-Based Service Application Fees
- Amateur (Part 97): $35 for a new license or renewal. No annual regulatory fee.
- GMRS: $35 for a new license or renewal. No annual regulatory fee.
- Part 90 new application: $105 application fee, plus an annual regulatory fee of $100 for frequencies below 470 MHz or $250 for frequencies at 470 MHz and above.
Part 90 regulatory fees are billed every year the license is active. Frequency coordination is a separate charge paid to the coordinator. For a single-site system, first-year out-of-pocket typically runs a few hundred dollars once you add application fee, regulatory fee, and coordination.
What You Have to Do After You’re Licensed
Holding a license creates ongoing obligations that trip up operators who assumed the paperwork was the hard part.
Station identification is the big one. Part 90 licensees must transmit their assigned call sign during each exchange of transmissions and at least once every 15 minutes during continuous operation.12eCFR. 47 CFR 90.425 – Station Identification For DMR users there’s a twist: when your system is running in digital mode, you must switch to unencrypted analog voice (or Morse code) to send the call sign. All digital encoding has to be disabled during the ID itself.
Part 90 also comes with a construction deadline. For most frequencies below 700 MHz, you must place the system into operation within 12 months of the grant date, or the authorization cancels automatically.13Federal Communications Commission. Construction Requirements by Service After you build out, notify the FCC through ULS no later than 15 days after the deadline.14Federal Communications Commission. Construction/Coverage Requirements
Both Part 90 and Part 97 licenses run for 10-year terms.15eCFR. 47 CFR 97.25 – License Term The renewal window opens 90 days before expiration; you file through ULS the same way you filed originally.16Federal Communications Commission. Common Amateur Filing Task – Renewing a License Miss the expiration on an amateur license and you get a two-year grace period to file for renewal, but you cannot transmit until the renewal is actually granted. Let the grace period lapse and the license is gone. For Part 90, letting a business license lapse risks losing your assigned frequencies to other applicants in the area, so keep your ULS contact information current for renewal reminders.
Penalties for Transmitting Without a License
Under 47 U.S.C. § 503, civil forfeitures for individuals and non-broadcast businesses can reach $10,000 per violation or per day of a continuing violation, with a cumulative cap of $75,000 per act.17Office of the Law Revision Counsel. 47 USC 503 – Forfeitures Numbers like that add up quickly when a system has been running unlicensed for weeks or months.
Beyond fines, 47 U.S.C. § 510 authorizes the government to seize radio equipment used with willful and knowing intent to transmit without authorization.18Office of the Law Revision Counsel. 47 USC 510 – Forfeiture of Communications Devices For a business that invested thousands in a DMR repeater and fleet of portables, forfeiture alone can be devastating. Criminal penalties are also on the table for willful violations, though the FCC typically pursues civil enforcement first.
When GMRS Makes More Sense
Not every DMR user needs Part 90 complexity or an amateur exam. If your use is personal, say coordinating with family, neighborhood emergency preparedness, or outdoor recreation, GMRS may fit better. It costs $35, requires no exam, and covers you and your immediate family for 10 years.2Federal Communications Commission. Personal Service and Amateur Application Fees Some DMR-capable radios can operate on GMRS frequencies; verify your specific equipment is type-accepted for GMRS before transmitting.
GMRS will not work for business operations, and it gives you access to far fewer frequencies than Part 90. For someone who just wants legal digital radio communication without frequency coordination or a technical exam, it’s the fastest route in.