Codan Radio MT-4E Paging - Manual (Page 29)

MT-4E PAGING SYSTEMS | USER GUIDE
Chapter 3: MT-4E Paging System Components Page 21
MT-4E RECEIVER (OPTIONAL) AND TRANSMITTER
MODULES
The MT-4E receiver and transmitter modules offer high performance and low current consumption and
are capable of 12.5 KHz (narrowband) and 25 KHz (wideband) paging operation. Settings such as
frequency, bandwidth and power output are PC programmable via the Codan Radio Service Software
(RSS).
The MT-4E receivers are used to link paging systems and are available in two versions supporting
either Class A or Class B performance as defi ned by TIA. Class A receivers offer improved Adjacent
Channel Rejection, Spurious Response Rejection and Intermodulation Rejection. Class B receivers
are optimized for low power consumption.
The MT-4E receiver requires a hardware and fi rmware modifi cation for Simulcast operation.
The MT-4E transmitter must be fi rmware version 2.2.1 and up to be used in a paging system. The MT-
4E transmitters also require some minor hardware modifi cations to be used in a paging system. On
the mainboard of the transmitter, jumper JU1 (X) needs to be removed and jumper JU1 (Y) installed
to enable external selection of the Analog / Digital paging switch. Jumper JU13 (X) also needs to be
removed and jumper JU13 (Y) installed to bypass the DSP and allow direct modulation of the transmitter
synthesizer. The transmitter requires complete factory re-tuning at Codan after bypassing the DSP.
An optional external frequency input can also be enabled on the transmitter to allow higher frequency
stability from the paging modulator.
When transmitting digital paging signals (POCSAG, FLEX™, etc), the Analog (A) LED on the transmitter
will be active. The Digital (D) LED is only active for P25 Digital transmissions. The Analog / Digital MIC
MODE switch on the front of the transmitter is only used for mixed mode P25 Digital / Analog systems
and is not used for paging systems. The switch can be left in either position.
The MT-4E receiver and transmitter are shown in Figure 3-12.
Figure 3-12: MT-4E Receiver and Transmitter
TRANSMITTER
CNTL
BUS
MIC RF OUT
A D
ANALOG
DIGITAL
NORM
OFF
KEY TX
MIC MODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
A D
RF N I
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE