GTR 8000 Base Radio
•
Transceiver RF Board
: Contains DC power conversion/regulation and performs receiver and exciter
functions.
•
Transceiver Option Card
: An optional board that attaches to the control board. Provides an internal
10 MHz frequency reference. For conventional base radio/receiver operation it also provides the analog
interfaces and wildcard I/Os. The transceiver option card requires an internal frequency reference oscillator
alignment at different intervals that is mandated by its category and frequency band. See Base Radio Service
Help > Service Screens > Alignment Screens in the
CSS Online Help
for the alignment procedures and
mandated intervals. The transceiver option card is available in two categories:
–
OCXO (Oven Controlled Crystal Oscillator)
– operates at 0.1 ppm which is inclusive to temperature
and aging. The OCXO Transceiver Option Card is available in 700/800 MHz, UHF R1/R2, and VHF
frequency bands.
–
TCXO (Temperature Compensated Crystal Oscillator)
– operates at 1.5 ppm, of which 0.5 ppm is
allocated to temperature and 1.0 ppm is allocated to aging. Reference precision with the TCXO is
traded for lower power consumption. The TCXO mandates shorter maintenance intervals. The TCXO
transceiver option card is available in UHF R1/R2 frequency bands. The TXCO is only available for
non-simulcast conventional systems.
2.1.1.1 Transceiver Control Board
The main operating software for the base radio is loaded in the XCVRs control section. As the main manager for
the base radio, the XCVR control board provides operational control over the other station modules. It handles
three types of information flow, in the following ways:
• Serves as a gateway between the network and RF functionality, by distributing the RF payload to and
from the network.
• Supports operational and diagnostic functions with digital control data (for example: site information,
channel assignments, and identification numbers for call processing).
• Ensures the flow of other network management configuration information.
shows the information flow through the transceiver control and RF sections for trunked and digital
conventional operation.
Figure 2-2
Transceiver Control Board Information Flow
2.1.1.2 Transceiver RF Board
In addition to DC power conversion/regulation, the XCVR RF board provides circuitry for the following exciter
and receiver functions.
2-2
6871022P86-A - November 2012
Содержание GTR 8000
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