The silent mode menu option can be enabled in the following way:
- go to Menu ->Maintenance -> Enter Feature Code
- enter 4050017A
After cycling the power a 'Set TX Silent Mode' menu will appear under User Settings, where silent mode can be enabled/disabled using either a menu setting or an external switch.
If you wish to remove the silent mode option please follow the same process as above, entering the following feature code instead:
4050017B
After cycling the power you will find the silent mode menu option has been removed.