One last? but pretty interesting observation:
It looks as if the problem is somehow temperature-related. If I place the P4P outside my window (in Switzerland it's around 0°C at the moment), the transmission quality looks fine. If I take it inside, it soon starts to have dropouts... Of course the interference with other electronc devices is higher, inside, but not that much, I believe.
That could also explain why the two test flights worked pretty fine, at least for the first 10-15 minutes. Afterwards (maybe because the transmitter warmed up) the dropouts started to occur, even outside on the test field.
It looks as if the problem is somehow temperature-related. If I place the P4P outside my window (in Switzerland it's around 0°C at the moment), the transmission quality looks fine. If I take it inside, it soon starts to have dropouts... Of course the interference with other electronc devices is higher, inside, but not that much, I believe.
That could also explain why the two test flights worked pretty fine, at least for the first 10-15 minutes. Afterwards (maybe because the transmitter warmed up) the dropouts started to occur, even outside on the test field.