George, we are using the JetCat telemetry in Heli's with Futaba 18MZ and no problems now.

What version are you using ?
The early ones came in a simple wrapper and dropped out very easily.
The later versions are now in a moulded case and have not had any problems since changing over.

If you have the early version, JetCat will change it over.

modtron
Oxford UK