TN640 CI-PM-3 Paging Modulator
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
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CODANCOMMS.COMTECHNICAL NOTE:
TN640, REV 2-1-0, © Mar 2013
CANADA/US +1 250 382 8268 | TOLL FREE +1 800 664 4066
The Paging Modulator is a plug-in module which provides digital and/or analog paging capability, such as base
station paging, remote paging or simulcast paging, for MT-3 and MT-4 radio systems. The CI-PM-3 is confi gured
via the front panel switches and internal jumper settings.
The CI-PM-3 paging modulator supports both analog and digital paging formats, and can transmit POCSAG and
other 2-level modulation schemes at transfer rates of 512, 1200 and 2400 baud. It can also be confi gured for use
as a data repeater, whereby 2-level paging data is recovered, re-shaped and then re-transmitted to an additional
repeater/paging transmitter.
The CI-PM-3 supports 4-level modulation formats at data transfer rates up to 6400 bps. Each of the four modulation
deviation levels can be independently set, making the CI-PM-3 suitable for use in such pager signaling schemes as
Motorola’s FLEX™ paging protocol.
The CI-PM-3 uses an on-board frequency reference source consisting of a 10 MHz OCXO, with a frequency
stability of ± 0.35 ppm from -30°C to +60°C. For high stability applications (such as Simulcast), the CI-PM-3 paging
modulator may be confi gured to use an external high stability reference source (i.e., rubidium, GPS or WWV) with a
standard stability greater than or equal to 0.002 ppm, to discipline the on-board phase-locked loop OCXO oscillator.
The CI-PM-3 Paging Modulator includes the following standard features:
• low power analog and CMOS control circuitry (current draw of less than 250 mA).
• extended operating temperature range.
• jumper selectable repeater/paging transmitter confi guration.
• on-board 10 MHz OCXO.
• front panel selection of PLL OCXO using external high stability frequency reference.
• jumper and line selectable analog/digital paging confi guration.
• connection for optional CTCSS encoder/decoder.
• balanced 600 / single-ended microphone input.
• selectable digital delay for simulcast operation.
FLEX™ is a trademark of Motorola, Inc.
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
SET
DEV
4 LEVEL
SETUP
MODE
DATA
MODE
A D
2 LEVEL
SET
MOD
NORM
REF IN
REF OUT
PAGING
MODULATOR
DATA
INT
FREQ
REF
EXT
DATA / CTRL
PORT
PULL DOWN
TO REMOVE
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
SET
DEV
4 LEVEL
SETUP
MODE
DATA
MODE
A D
2 LEVEL
SET
MOD
NORM
REF IN
REF OUT
PAGING
MODULATOR
DATA
INT
FREQ
REF
EXT
DATA / CTRL
PORT
PULL DOWN
TO REMOVE
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