Codan Radio MT-4E Paging - Manual (Page 30)

USER GUIDE | MT-4E PAGING SYSTEMS
Chapter 3: MT-4E Paging System Components Page 22
PAGING MODULATOR (CI-PM-3)
The MT-4E modules may be confi gured to operate in digital and/or analog paging confi gurations, such
as base station paging, remote paging or simulcast paging using the CI-PM-3 paging modulator. The
CI-PM-3 is confi gured via the front panel switches and internal jumper settings.
The CI-PM-3 paging modulator is required for digital only or mixed mode (digital and analog) paging
confi gurations, but is not required for non-simulcast, analog only paging confi gurations. The AC-3E
audio control card can be substituted for non-simulcast, analog only paging confi gurations.
The CI-PM-3 paging modulator is shown in Figure 3-13.
The CI-PM-3 paging modulator supports both analog and digital paging formats, and
can transmit GSC, Multitone Mark IV / V / VI and VII, POCSAG and other 2-level
modulation schemes at transfer rates of 512, 1200 and 2400 baud.
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.
Figure 3-13: CI-PM-3 Paging Modulator
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.
• front panel selection of PLL OCXO using external high stability frequency reference.
• jumper and line selectable analog/digital paging confi guration.
• balanced 600 ohm / single-ended microphone input.
• selectable digital delay for simulcast operation.
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