12/7/2023 0 Comments Sma drone meaning![]() The best situation is when all radio waves arrive in phase and add to each other. When multipathing occurs, the RX receives a wave directly from the TX and others which have bounced off surfaces. My problem was that using a high gain patch antenna would, in certain scenarios, amplify the leaking VTX signal from another pilot flying closer to the pilot tent which would interfere with my FPV feed. A VTX will ‘leak’ its signal into surrounding channels which can be picked up by high gain antennas. This setup works well for racing as the removal of a patch decreases the sensitivity of the setup. Personally, I use two vertical Lumeneir AXII antennas on my ImmersionRC Rapidfire module for racing scenarios. You should experiment with your VRX antennas in new scenarios to find which is ideal for the surroundings. For noisy environments where there is a lot of multipathing (such as indoor flying), I do not recommend using a patch antenna. For long range, I recommend mounting your VRX antennas onto a ground station to prevent head movements from impacting the FPV signal. On diversity set-ups, I recommend using both a patch and a CP antenna for must use cases. If using a single receiver module, I recommend a circular polarised antenna. VRX antenna mounting is also fundamental to a good FPV feed. ![]() Video Receiver (VRX) FPV Drone Antenna Mounting The below image demonstrates where I position my VTX antenna. For long range, I would recommend a long protruding antenna. Better signal can be gained from using a longer antenna however I prefer the extra durability for a minimal video performance loss. ![]() I recommend using cable ties and/or a bracket.įor racing, I prefer to mount my antenna close to the frame (inside my canopy) to prevent damage. By securely mounting your antenna to your craft with some slack in the pigtail going to the VTX, you can minimise the risk of VTX damage. When mounting the antenna, you also want to mount it in a way which minimises the force on the VTX in a crash. The best solution for this is to mount the antenna out the back of the craft at an angle. Ideally the antenna should also be in a position where a theoretical line can always be drawn between it and your VRX antennas without the drone frame blocking it. Regarding the placement of the VTX antenna on the drone, it should be positioned as far from the frame as possible. You can learn more about FPV drone antennas here. This antenna has the best gain of ~2dBi at +/- 90 degrees and the worst gain at 0/180 degrees as indicated by the green line on the plot. The image below shows a radiation plot of a right hand circularly polarised antenna (the Lumeneir AXII) from the side. The same goes in the negative direction where -3dBi is half as bad as 0dBi. If it is 6dBi, that is four times as good. For example, if a signal is at 3dBi on an area of a radiation plot, the signal there is twice as good as an area where it is 0dBi. Every time the gain goes up by three, the signal strength doubles. ![]() Gain is measured in dBi and is a logarithmic scale. The higher the gain the better the signal. The plot displays the gain at a given angle from the plane’s origin point. A single circular plot displays the antenna gain from a single plane. To demonstrate the propagation of an FPV drone antenna, manufacturers use radiation plots. In this guide, I will go over the basics of an FPV drone antenna along with some mounting tips and tricks. They are essential in this hobby as they form part of the control links to and from the craft. An FPV drone antenna is a device which radiates radio waves in a specific pattern.
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