New milestone for ExpressLRS: Wezley Varty explain how he and his team reached 100km flight distance with ExpressLRS control and telemetry system. Note: The sniper dish feed wasn’t LHCP to account for the reflection of the dish so video would probably been solid for the whole flight if that been the case.
What affects performance explained Ian and Mads Tech made an excellent explanatory video about antenna performances, featuring some of our content:
I often get asked on which channel X or Y antennas are tuned too. The short answer is: There’s no such thing as a tune so specific that it encompass a single channel, for hobbyist at least. The long answer is a perfect tune on a certain channel won’t make any difference as the bandwidth […]
The pagoda antenna was developed by Maarten Baert as a free to use design. It quickly became a popular antenna, with multiple brands selling them as is or with various attempts to encase or otherwise protect it. In this post we will study the inner functioning of the pagoda and what are the effects of […]
The chart above represent a view from the top of the coverage and range of different antennas. The range estimates are based on the used of a 200mW Vtx. Numbers are a bit on the conservative sides too. As I said in previous articles, if you switch to a 800mW Vtx, you can double all […]
The whoop size Beta 85X quadcopter comes with everything, 4S power, HD recording, 200mW Vtx and the new Lumenier micro AXII. Available at most reputable FPV dealers and betafpv.com.
S11 (return losses) is another expression for SWR (standing waves ratio) and IMO a better one. It is the ratio of port #1 to port #1, in other words, what comes out of port #1 relative to what you injected in port #1. When you send power to an antenna, some of it is reflected […]
Mishaps. They always happen, no one escape. When your singularity antenna is smashed by an unfortunate event, not all hope is lost! With a 3D printer and basic soldering skills you can salvage your dead antenna and turn it into a “polarizer”. First, tear away the ends caps, then un-solder the network. The elements […]
Above is a radiation pattern from an omni directional antenna (AXII) typically found on aircraft transmitter. The usual dBi unit been replaced by ratio of maximum range. You may ask why we didn’t simply marked in meters or kilometers? Because the ultimate range depends on a lots of others factors than one antenna. However, keeping […]
In this article, I’m going to explain the RF link «budget». Where is that budget, how it can be calculated and what affect it for better or worse. Your budget is spread over 3 things: Tx power, Rx sensitivity and antennas gains.