![]() ![]() In case of D16 - which has an average frame length of 25ms - Link Quality will only be calculated for the last 0.4 seconds. We need to differentiate two different kinds of Link Quality - There is Link Quality that is build into Betaflight and Link Quality that is provided by the receiver itself, like for example the TBS crossfire receivers.Īnd this is a really big difference: Betaflight calculates Link Quality from the last 16 packets that it received. The problem, or the short coming with RSSI is, that it is just a momentary snapshot of the signal strength, it does not tell you anything about the noise level and you do not know how many data packages have properly arrived and could be processed by the flight controller, this is where LQ - Link Quality comes into play. In the Betaflight OSD the frequently used RSSI element for the receiver has a scale from 0 to 99 - 99 being the best. This is a obviously a very simplified way to look at it, usually there is a bit more logic that decides when to actually switch to the “best” receiver, and systems like RapidFire add another layer of logic to the processing of the signals from both receivers. ![]() The RSSI signals are compared and the circuity simply switches between the receiver with the highest RSSI value. In FPV, RSSI is often used in the simplest version of diversity receivers, where the “best” receiver is chosen based on its RSSI value. Often the RSSI strength is broken out as an analog DC signal. RSSI is often measured at a point of the circuity before any amplification has been applied, basically as raw as possible.
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