UG-001 Daniels P25 Radio Systems
www.danelec.com
Chapter 2: Technical Information
9
User
Guide
M I X E D M O D E O P E R AT I O N
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.
U P G R A D I N G F I R M WA R E V E R S I O N S
Daniels MT-4R and MT-4D 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 3.7 for the Receiver. Previous fi rmware
versions can be returned to the factory for upgrade.
MT-4E modules will be fi
eld fi
rmware upgradeable (using a
programming cable and interface module).
Table 2-1 shows the fi rmware versions for MT-4 modules.
