Reasoning: The OpenTX sensor "RSSI" is populated by the individual OpenTX telemetry protocol implementations and returns a value from 0..100 (percent) originating from the early FrSky implementation. It turns out that FrSky did not really provide a genuine signal strength indicator in units of dbm but a link quality indicator in 0..100%. With Graupner HoTT the link quality indicator is not a good basis for the model locator as it is very non-linear and doesn't change much with distance. Using the Graupner HoTT telemetry sensor "Rssi" which is a true signal strength indicator serves the purpose of locating a model much better as it varies much more with distance.