RC-SIM

Check if there is good contact between the interface cable and the adapter for the radio. Sometimes there is loose contact.
Corrective: Cut the connectors and make a solder connection between the cables.

Further options:
1. Are all cables connected?
2. Remove oscillator from radio.
3. Switch on radio (choose a free and empty model without any mixers).
4. Check modulation. It MUST be PPM.
5. Load MIX-Program at first.
6. Delete all other settings.
7. Restart PC and calibrate