User's Manual

3-6 Viking VM600 Mobile Radio Operating Manual
Dual Control Configurations Section 3 - Dual Controls & External Speaker
3.1.7 Dual Control Operation
3.1.7.1 Power On/Off
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.
3.1.7.2 Microphone Audio
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.
Draft 4/29/2014