Traffic Information; Radio Range - FLARM FUSION PowerFLARM User And Maintenance Manual

FLARM Technology Ltd
Hinterbergstrasse 15
CH-6330 Cham
6.5

Traffic Information

In addition to collision warnings, FLARM sends the following information about
proximate aircraft to connected displays:
Position (relative)

ICAO 24-bit address or FLARM radio ID

True Track

Turn rate

Ground speed

Vertical speed

Aircraft type

Additionally, supplemental information can be sent for later data port protocol
versions.
6.6

Radio Range

Other aircraft must be within radio range (line-of-sight) for FLARM to be able to
provide collision warnings. The effective range depends on the type and position
of installed antennas as well as a proper installation. External FLARM antennas are
recommended in general, since they typically achieve better range than an internal
setup. Under optimal conditions, the system can give a range of well over 10 km.
For speeds up to 250 kt head-on, a range of 5 km is required (and sufficient) for
FLARM to be able to warn in time.
If there is only one FLARM antenna installed (e.g. on top of the aircraft), the range
in some directions (e.g. directly below the aircraft) may be limited due to aircraft
parts or the human body attenuating the signal. It is thus recommended to install
two antennas (antenna diversity).
Note: It is not allowed to use antenna splitters.
POWERFLARM
FUSION USER AND
MAINTENANCE
MANUAL
Date: 2020-11-10
Version: 1.0
Page: 32 of 49
Document Number:
FTD-078