Codan Radio MT-4R - Manual (Page 17)

UG-001 Daniels MT-4R and MT-4D Radio Systems
www.danelec.com
Chapter 2: Technical Information 9
User
Guide
MIXED MODE OPERATION
Mixed mode operation is used to allow the receivers and transmitters
to work in either analog or P25 digital mode without reprogramming
the radio.
A mixed mode receiver will receive the incoming FM or C4FM
transmission and will automatically detect and demodulate the signal
to an analog or P25 digital signal. The receiver will then output either
an analog or digital COR signal, as well as the appropriate serial data.
A mixed mode transmitter will accept the incoming serial data and
analog or digital PTT and will modulate the signal as either FM or
C4FM, based on its input. This allows the repeater to repeat both
analog and P25 digital signals.
The MT-4R and earlier MT-4D modules mixed mode response times
are slightly delayed compared to analog only mode or P25 digital only
mode. MT-4D modules with fi rmware version 2.0 or higher now have
the same response times in mixed mode as in analog only mode or
P25 digital only mode.
UPGRADING FIRMWARE VERSIONS
Daniels MT-4R modules must be returned to the factory for fi rmware
upgrades. The last fi rmware version for MT-4R modules is Version
3.3 for the Transmitter and Version 3.8 for the Receiver. Previous
fi rmware versions can be returned to the factory for upgrade.
The MT-4D Base modules must be returned to the factory for fi rmware
upgrades.
The MT-4D Repeater modules may be returned to the factory for
fi rmware upgrades. An MT-4D Repeater Firmware Upgrade Kit is
also available for loan from Daniels Service department. Contact the
factory for availability of the fi rmware upgrade kit.
Table 2-1 shows the fi rmware versions for MT-4 modules.