Installation
Installation Instructions
The CM1481 is designed to be embodied physically within a mobile, portable or handheld transceiver to interface
electrically with Rx and Tx audio circuitry via the Radio Interface. The diagram below shows the input and output
system functions of the CM1481.
Before Installation it is recommended that this document is studied carefully.
Power Supply
(12)
(5)
PTT IN
GND
V IN
(13)
(4) QUIET/OPEN
(3)
(2)
(1)
Tx CALL
BUSY
CONFIG
Micro-Controller
Regulator
Tx ON
(11)
MUTE CTRL (10)
LED
TONE OUT
ALERT
(8)
(9)
(7)
(6)
SIGNAL IN
Audio
Signalling
Processor
EEPROM
Audio Switch
Fig.2 The Radio Interface
Method of Installation
Ensuring that there is sufficient room to introduce
the Radio Interface lead and the Configuration
Interface Connector, place the CM1481 into its
operating position using the double-sided sticky-pad
(supplied) on the discrete component side of the
module. Ensure that the module adheres firmly to its
mounting surface.
Consider the requirements for Single or Dual
Button operation.
Do not attempt to install the module into areas of
the radio where it may be subject to high RF fields.
Ensure that the CM1481 is well insulated from other
radio components.
It is recommended, at this stage, that some record
is formulated to identify the configuration state of the
module/radio pair.
Handling Precautions
The CM1481, which is supplied in an anti-static
package, contains CMOS devices. It is recommended
that to prevent damage, Electrostatic Discharge
Precautions are employed at all stages of any
production process involving this module.
Alert Audio Levels
If alert levels from the CM1481 are to be fed into
an external audio amplifier it is recommended that the
LINK is removed. Removal of the LINK will allow
connection to high-impedance loads.
LINK IN can drive an external loudspeaker.
LINK OUT can drive an external amplifier.
See layout diagrams, Figure 4, and Table 5 (Audio
Alert Descriptions).
Installation Dimensions
CM1481 board size.
45mm x 22mm x 8mm.
Power Requirements
The supply voltage requirement of the CM1481 is
between 6 and 26 volts d.c.
4
CMLMICRO [ CML MICROCIRCUITS ]
