This page describes a tool to assess reception of 2.4GHz signals with airborne measurements. Pretty much all 2.4 radios work. However, some will cope with difficult situations better than others and this tool can be used to assess these with a bit more data.
The tool is programmed when to expect signals and then records when they are not received. These situations are commonly called '2.4 lockouts' because the receiver goes into 'hold' or failsafe and the pilot has no control. Altitude, the number and accumulated duration of lockouts are recorded every second.
Reception of 2 receivers is monitored in all tests. Assan receivers have been used (X8R6 and X8R7 with short aerials). These only have one real aerial so are good for testing diversity. They can be put in 'difficult' models and situations to assess performance. The results will generally be relevant for all makes of 2.4 radio.
Conclusions: Both Transmitter and Receiver aerial orientation is important. So too is multi-path/diversity on the receiver(s).
Flight 5 Tx aerial 'side on' |
Flight A4 Tx aerial 'side on' |
Flight A3 Tx aerial 'end on' |
Flight A12 Total lockout time |
Flight A12 Average lockout time |
-20dB attenuator . |
Flight 4 . |
Flight 4 Orientation overlay |
Assan Rx Pependicular . |
Flight A6 Standard 25/35% loss |
Flight A5 Pependicular 17/17% loss |
Flight A20 Pependicular 42/35% loss |
Flight A21 Pependicular 33/32% loss |
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