RF module for spectrum?

[erhard52]

Erhard,

The XPS manual for the RFU says that its led will turn orange if the power supply falls below 4.5v.

Paul

yes i know and it was red but i did not pay attention initially - 
funny observation: while accidently brushing on a control surface the servo moved and it lit up the x10 LED in red.
the system was not power up.
no real surprise because the servo motor acts as generator but i never thought about this. so the entire RC electronics better be well protected against reverse polarity!

i had a long chat yesterday with AI regarding receiver sensitivities and when not counting long range receives are dual band then the XPS always comes out at the top. the benefit is due to its heterodyne input stage vs simple SDR designs. 
even the multiplex M-Link is only in the -90dBm vs RFU more like -95-100.
however that RFU benefit can go away in RF noisy environments which i think makes sense.