E F Johnson Company 2425M70 Benutzerhandbuch

The power switching in dual configurations is such that either control head can switch the 
radio on, but both control heads must be off to turn the radio off.

If the power button on both control heads is pressed, then the power button on both control 
heads must be pressed again to turn the radio off.

It is therefore recommended to always turn the radio on and off using one control head, to 
simplify operation and avoid confusion.

In the dual remote control configuration, when transmitting from one of the control heads, 
it is possible for the push-to-talk (PTT) on the microphone of the second remote head to 
also be active. In this case, the voice transmissions of both users will be transmitted, 
resulting in a "party line" operation. This is done to allow either control unit access to the 
voice channel, and to eliminate the circumstance where one operator may be prevented 
from having their transmission heard because the other control head is already 
transmitting.

To prevent a second operator from interrupting a transmission already in progress, the user 
should look at the transmit indicator on the control head prior to pushing PTT to verify that 
the mobile radio is not already transmitting from the other control head.