Traficom steers and supervises the use of radio spectrum in Finland. By planning the use of spectrum, Traficom aims to ensure that sufficient radio frequencies, that are as interference-free as possible, are available to radio systems.
The transmitters and receivers in remotely piloted, or radio-controlled (rc), drones, copters and other aircraft (UAS/RPAS) as well as in their flight controls are radio equipment. Therefore, they must meet the requirements set for such radio equipment.
Command and control links
A drone or remotely piloted aircraft is controlled wirelessly mainly from the ground. The flight control may be a radio transmitter or a more complex control and command station with a video display. The remote pilot, who is on the ground, can control the aircraft using command and control links and receive real-time information about the aircraft systems, such as the rotational speed of motors.
The most commonly used frequencies for controlling drones (from ground to air) are the ones for licence-exempt radio equipment:
- 2400.000–2483.500 MHz, in which case the transmitter's effective radiated power is either
- ≤100 mW EIRP, if the applicable standard is EN 300 328 on the digital wideband data transmission equipment (WAS), or
- ≤10 mW EIRP, if the applicable standard is EN 300 440 on general short range devices (SRD).
- 5470.000–5725.000 MHz, in which case the transmitter's effective radiated power is ≤ 1 W EIRP and the power spectral density of transmission is ≤ 50 mW/1 MHz EIRP. The applicable standard is EN 301 893 on RLAN equipment.
(The use of this frequency band is being discussed within the international cooperation. The results may lead to removing this frequency band from being used on board aircraft.)
- 5725.000–5875.000 MHz, in which case the transmitter's effective radiated power is ≤25 mW EIRP and the applicable standard is EN 300 440 on general SRD.
Other frequency bands suitable for controlling drones and remotely piloted aircraft can be found in the Traficom's Regulation 15.
The frequency band 5030–5091 MHz is, according to the Radio Regulations published by the International Telecommunication Union ITU, allocated to the aeronautical mobile (route) service and limited to aeronautical systems standardized internationally by the International Civil Aviation Organization ICAO.
Payload refers to other radio equipment than those used for command and control links. The most common payload device is a camera that can send real-time video feed from the aircraft to the ground. A thermographic camera or different measuring equipment may also be included in the payload.
Frequency bands 2400.000–2483.500 MHz, 5470.000–5725.000 MHz (see usage restriction above) and 5725.000–5875.000 MHz may be used for the payload devices of an aircraft in addition to command and control links.
The frequency 1320 MHz is only meant for sending video feed from aircraft to the ground. Using this frequency requires a radio licence that can only be obtained for a fixed period.
Use of mobile network frequencies
In principle, it is not allowed to use mobile network terminals on board an airborne drone, unmanned aircraft or other aircraft unless it is specifically allowed in Traficom's Regulation 15.
Under Traficom’s Regulation 15, authorities and major critical infrastructure providers may use mobile communications necessary for performing their tasks on board aircraft without a licence. This arrangement is fixed-term until 31 March 2021.
With the consent of mobile operators, Traficom may also exceptionally grant a radio licence that enables using mobile devices on board aircraft when flying at low levels. The mobile network frequencies specified in the radio licence may be used for command and control links, payload connections or calls.
Search for new frequencies for command and control links
There are no frequencies reserved for the command and control links of drones and RPA yet that would allow higher levels of radiated power than mentioned above. The process of determining such frequencies has begun in Europe. The aim is to find frequencies harmonised throughout Europe, which device manufacturers and importers could use for their products brought on the markets. This would provide the users of the frequencies a long-term solution enabling them to plan and carry out operations in the long run.
Short-term test licences are possible
Traficom may grant short-term test licences for tests and trials of RPA. Traficom assesses case-by-case whether a radio licence may be granted for the requested frequencies.
Traficom is the civil aviation authority in Finland
Traficom is responsible for ensuring that air transport is safe and as environmentally friendly as possible and for promoting the facilitation and flow of air traffic. Traficom considers aviation issues from the perspective of airline passengers, airlines, private pilots and airport operators.
More information about flying drones at Droneinfo.fi (External link).