• FLARM Dipole Core A&B and Portable A&B (with adapter) Antenna - SKU 1429FLRM
• ADS-B Dipole Core and Portable (with adapter) Antenna - SKU 1429ADSB
• Flarm Rod Portable Antenna - SKU 1430FLRM
• ADS-B Rod Type Portable Antenna - 1430ADSB
Antenna Installation Guidelines
This page is only addresses FLARM RF antenna installations. Refer to the PowerFLARM manual for information on GPS antenna placement and installation.
The following section “Antenna Installation Guidelines” gives you guidelines on how to properly install FLARM RF antennas. If you follow these guidelines you will likely get a good installation for collision avoidance. However, optimal installation for an individual aircraft type is not possible because of variations in aircraft type and the materials used.
Therefore, do not make the first installation permanent. Check the section “How to build a temporary dipole antenna mount” and follow the installation guidelines for a first try. This will likely give a good range or at least give you a good starting point for further optimization. Keep in mind that for safety purposes you require a range of only 1 NM forward, less to the sides (See “FAQ” section for explanation). Once you are happy with the achieved range, make the installation permanent.
Do's and Dont's
• Before connecting, always check type and polarity of antenna connectors carefully!
• Have a very good look at the inside conductor, one side MUST be male, the other MUST be female.
• Attaching incompatible antenna connectors will cause loss of performance, permanent damage to the device and void the warranty.
• Mount antenna clear of any object except for the parts intended for attachment by antenna designer! (e.g. adhesive patch on PowerFLARM remote antenna)
• Give the antenna as much ‘free’ room as possible!
• Don’t let it touch anything!
• Keep in mind that not just conductive material but also humans attenuate signals. Glass fiber and Kevlar barely attenuates signals.
•Always connect an antenna to FLARM A port!
If you only use one antenna, connect it to FLARM A port. If you feel that your airplane attenuates signals strongly in one direction, you can connect a second antenna to the FLARM B port. The best solution however is to find a place where the antenna on FLARM A port can freely radiate in every direction. Do not connect more than one antenna to one RF port (e.g. by splitter)!
•Ensure that the installation does not conflict with any operation of the aircraft e.g. Canopy emergency release
No, the coaxial antenna cable will not ‘just rip’...
•Keep antennas separated as far as possible!
Min. distance between RF antenna on FLARM A and FLARM B port: 1ft (0.3 m)
Min. distance between RF antenna on FLARM A port and GPS antenna: 1ft (0.3 m)
Min. distance between RF antenna on FLARM B port and GPS antenna: 4in (0.1 m)
Min. distance between ADS-B / XPDR antenna and GPS antenna: 4in (0.1 m)
•Do not mount antennas on conductive material (e.g. any type of metal, carbon fiber)!
Exception: If you are using third party antennas which require a ground plane¹.
Alternative Antenna Types / Placements
PowerFLARM is delivered with universal antennas that work well for most installations. However, some alternative antenna types or placement locations may be beneficial.
On top of the glare shield installation
Example of factory installed glare shield antennas; required ground plane is hidden under the cover. ADS=B/PCAS antenna on left, FLARM antenna on right.
Some aviation antennas e.g. the ones used for transponders, will work very well, talk to the antenna supplier about performance in the 902-926MHz band used by FLARM in North America. FLARM cannot share an antenna with a transponder.
Antenna in tail
Some carbon gliders have dedicated glass only areas in their tails for VHF and other antennas. It may be possible to place the FLARM antenna there. ‘Low loss’ coaxial cables must be used with less than 1.5dB/10m attenuation at 900MZ, e.g. LMR-400. DO NOT use RG-174 coaxial cable for any extensions > 1m (3ft)
Antenna in gear box
This location is NOT recommended for the ‘A’ port antenna. In carbon gliders, the ‘B’ port antenna may be placed in or near the gear box to improve coverage from below, if the gear doors are not made out of carbon.