This is a TX module for the 9x that works with Skyartec receivers (eg. Wasp 100 Nano CP, etc). It uses an off-the-shelf generic CC2500 module (eBay/China) and has an integrated LNA that provides 100mW output. The RF module is controlled by an Arduino Pro Mini board which converts the PPM signal from the 9x to the Skyartec protocol. The TX module runs at 3.3V and uses a single 2N7000 MOSFET for level conversion of the 5V 9x PPM signal.
I fly with a fairly low power setting. If you look in “skyartec9x.ino” at the skyartec_init() function the power output can be increased. The current code looks like:
That can be changed to:
for maximum power.
This is the CC2500 module I used:
Although almost any CC2500 module will work.
I use a separate power supply and 9x interface board that supplies the 3.3v and PPM signal.