(VFO/MR) goes active, it will default to transmit on that channel. This behavior can be
inconvenient, especially if when monitoring a frequency you should not transmit on. There is a
menu option available to lock the transmitter to one of the A or B channels.
Procedure 6.2. Locking the Dual Watch transmit channel
1. Press the key to enter the menu.
2. Enter on the numeric keypad to get to TDR-AB.
3. Press to select.
4. Use the and keys to select A (upper) or B (lower) display.
5. Press the key to confirm.
6. Press the key to exit the menu.
If you want to momentarily override the lock without having to setting the menu option
to OFF, you can do so by pressing the key an instant before pressing the PTT.
Another option is to disable menu (TDR) to override the lock. Then re-enable TDR
when you want the lock resumed..