RF module for spectrum?

[erhard52]

Erhard,

Your 60% link quality at link failure is uncomfortably close to your 70% flight result.

I've read about folks tuning their 4in1 units to improve the performance.  The procedure is done right from the transmitter.  I do not know how as I have never done it.  Maybe that would increase your safety margin for the sailplane.

Paul

thanks Paul
the tuning is easily done on the radiomaster system, and i did it - yes this is for the 4-in-1 module.
you basically detune it on both sides - lower and higher frequency side and then use the middle value.
you detune it until link breaks on either side.

my the range test still refers to the XPS  module in my multiplex but i get similar range data with the XPS F1 module. 
how can it only be 2m when drew says it should be 30-50ft without TX antenna?

drew always makes it sound like the range is more dependent on the receiver sensitivity than the output power. in the end the range should still depend with 1 over square on the output power.
my receiver antenna ends are now out on the wing and orthogonal to each other.
drew says somewhere that in range test the output power is 0.15mW so in regular mode we have like 50mW? that would be 17x more range. that makes 20m to about 300m. to be honest that sounds about what i see with the glider. 
the main problem is that my actual range test distance is at least 2 x short i think than what it should be.
maybe i can repeat the range test with the radiomaster system and removed antenna.


you are right the 70% or sometimes only high 60ies is not making me feel good either. only argument i have it is a glider and does not need super fast response in case of soaring. 
what nags me as an engineer is that i do not understand what is causing this issue. my output power is at level 5 per XPS instructions.