Dynon Avionics DX15 - Manual (Page 11)

DX15 User Guide 1‐3
aircraft manufacturers, or persons engaged in chase activities related to
soaring and ballooning.
Per the FCC
(
http://wireless.fcc.gov/services/index.htm?job=licensing&id=aircraft_stations )
... you do not need a license to operate a two‐way VHF radio, radar, or
emergency locator transmitter (ELT) aboard aircraft operating
domestically. All other aircraft radio stations must be licensed by the FCC
either individually or by fleet.