Transceiver Control Board; Transceiver Rf Board; Figure 6: Transceiver Control Board Information Flow - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 2: GTR 8000 Base Radio Theory of Operation
Transceiver Option Card
An optional board that attaches to the control board. Provides an internal 10 MHz frequency
reference. For conventional 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 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 and 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.
Figure 6: Transceiver Control Board Information Flow on page 62
the transceiver control and RF sections for trunked and conventional operation.

Figure 6: 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.
62
shows the information flow through