E.F. Johnson Company 5300 Series Instructions d'exploitation Page 47

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ES Series Mobile Radio Operating Manual 2-17
Controls & Display
2.4.5 Dual Control Operation
2.4.5.1 Programming Dual Remote Control Configurations
The Dual Remote configuration requires special programming to accommodate both
remote control heads in the mobile radio system. Radios used in the dual remote control
configuration must have application software of 6.8.6 or later, and must be programmed.
Removal of either control head will affect system performance.
2.4.5.2 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.
2.4.5.3 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.
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