ITC 220 Base Station, Locomotive & Wayside Radio Transceiver Field Service Guide PN 0046300120 Rev. A
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5.8
DETERMINE AND VERIFY OR SET GPS COORDINATES (BASE STATION AND WAYSIDE
TRANSCEIVERS ONLY)
Base Station and Wayside Transceivers, because it is generally known where each will be installed, may have default
GPS coordinates already entered as part of system planning and configured before shipment. For the most part, this
works to the advantage of the installer. A hidden risk where this can become problematic though, is where a
replacement transceiver is used to replace a non-working unit or where a transceiver intended for installation at one
location is substituted for another at a different location. In these cases, if a GPS location has been programmed into
the system, it is most likely wrong. In any case, because being configured with the correct global position of the
transceiver is essential to its proper function, it is important to determine and verify—and if necessary correct—the
GPS coordinates configured in the transceiver.
APPENDIX E— GPS Satellite Constellation Overview and Antenna Planning Considerations
provides a general overview
of GPS as it relates to the system. If you are not familiar with the concepts, it is good reference material. The sections
that are important here are those contained in
E.2.2 Determine GPS Coordinates
.
If the GPS coordinates of the Wayside Transceiver location are known use the instructions and example contained in
Surveyed position obtained offline
to enter the GPS coordinates and configure the transceiver to use GPS Manual
mode.
If the GPS coordinates are not known or the transceiver will be used in a mobile application, use instructions and
example contained in
GPS determines its own position
, to configure the transceiver to use Survey mode.
Note:
If you choose to have the Wayside Transceiver continue to use Survey mode (for example where the transceiver
will be used in a mobile application), DO NOT enter GPS coordinates in the CIM script.
5.9
TRANSCEIVER TEST AND ADJUSTMENT PROCEDURES
Some of the procedures you perform to solve a problem consist of a single, simple step, such as tightening a cable
connection to fix a transmission problem. But several procedures consist of multiple steps. Multiple-step procedures
are described in this section.
5.9.1
REQUIRED EQUIPMENT
The tests and adjustments described in this section require service personnel to have equipment listed in the
Recommended Equipment
section, as well as the skill and knowledge to use them.
Note:
Base Station Transceivers come in two versions that differ only in their voltage requirements: 24 VDC or 48 VDC.
The table below describes the power supply requirements for each type. Locomotive and Wayside Transceivers have
different voltage requirements (74 VDC and 13.6 VDC) as noted below.
Caution
– Applying an incorrect voltage to the Base Station Transceiver can cause damage. Confirm the
voltage rating of the Transceiver and power source before applying power.