Beginning May 20, 2021, all amateur examination applicants will be required to provide an FCC Registration Number (FRN) to the Volunteer Examiners (VEs) before taking an amateur exam. This is necessary due to changes the FCC has made to its licensing system.
Amateur candidates who already have an FCC license, whether for amateur radio or in another service, already have an FRN and can use the sa…
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Source: ARRL