User's Manual

MM102558V1 R1A
6.1.2.6 Data Module
Data Module 19D904558, shown in
Figure 6-8, allows the MASTR® III
Base Station to transmit Non Return to Zero (NRZ) data such as those
produced by paging systems.
The Data Module accepts data with rates up to 9600 baud within a range
of -25V to +25V. The Data Module produces two corresponding outputs;
a modulated 12.8 MHz reference signal to drive the Reference Input of
the Transmit Synthesizer, and filtered audio data that modulates the audio
input of the Transmit Synthesizer. Together these modulation sources
produce a clean data pattern resulting in reliable data transmissions.
Figure 6-8: Data Module
6.1.2.7 AMPF Module
AMPF Module KRG 101 56/1, shown in
Figure 6-9, is a self-contained
DSP-based plug-in module capable of filtering audible low frequency
pops out of the base station’s received audio signal.
The module executes a proprietary DSP algorithm that reduces the audible
pops primarily caused by the reception of reflected or multi-path RF
signals because of an affect known as Rayleigh distribution or Rayleigh
fading.
Figure 6-9: AMPF
Module
6.1.2.8 Power Module
The Power Module 19D902589G2, shown in
Figure 6-10, provides
power to the T/R shelf and modules. It contains switching regulators for
the +5V, +12V, and -12V DC supplies. The output of the +12V and -
12V supplies are further regulated to provide +5V and -5V required by
the analog components.
Figure 6-10: Power Module
6.1.2.9 DSP Module
The DSP Module EA101800V1, shown in
Figure 6-11, The DSP Module
provides the necessary processing to generate and decipher the outbound
and inbound P25 signaling.
The DSP module extracts P25 intelligence from the 455 kHz Receiver IF
data output and forms it into two outputs, the High Speed Data (HSD)
output and a serial output. The HSD output is passed to the System
Module for re-transmission and the serial data is routed to a Station
SitePro for conversion to IP packets or other formats for remote
applications.
The DSP Module also encodes incoming data from the Station SitePro
and analog inputs into P25 data and passes it to the System Module. The
DSP Module allows the MASTR III P25 station to support the TIA 102
P25 Clear Air interface (CAI) protocol.
Figure 6-11: DSP Module
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