User's Guide

Paging Modulator Instruction Manual
IM55-CIPM3
1
Introduction
The CI-PM-3 Paging Modulator module is an
optional plug-in component of the MT-3 Radio
Repeater System. This module provides digital
and/or analog paging capability for Daniels MT-3
transmitters in all supported frequency bands.
The CI-PM-3 is designed for low power
consumption, typically drawing less than 250 mA
in steady state. In its standard confi guration, the
CI-PM-3 uses an on-board frequency reference
source consisting of a 10 MHz OCXO with a
standard stability of 0.03 PPM. 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. To ensure that paging signals are the
same relative to each transmitter, the CI-PM-3
also incorporates a limited delay compensation
for the different link propagation paths between
transmitters.
The CI-PM-3 Paging Modulator supports both
analog and digital paging formats, and can
transmit POCSAG and other 2-level modulation
schemes at data 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 1600 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.
Setup conditions are established via front panel
switch settings, while internal jumper settings
and setup adjustments are easily accessible
using the EC-96, 96 Pin Extender Card.
The CI-PM-3 Paging Modulator includes the
following standard features:
• low power analog and CMOS control
circuitry.
• extended operating temperature range;
• jumper selectable Repeater/paging
transmitter confi guration;
• on-board +/-0.03 PPM 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 Ω/single-ended microphone
input;
• selectable digital delay for Simulcast
operation
GENERAL
INFORMATION