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LTRx-512 Installer’s Guide
Connecting the LTR-GPS Satellite Receiver/Synchronizer
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APPENDIX G – Connecting the LTR-GPS Satellite Receiver /
Synchronizer
Lathem’s LTR-GPS is a Global Positioning Satellite receiver using 12-channels to access the accurate
date and time signal transmitted each second by 24 satellites in geosynchronous orbit around the globe.
The package includes an amplified GPS Antenna, which must be mounted out-doors or beneath a roof
sky-light, facing skyward. An integrated cable links the Antenna to the LTR-GPS Receiver Module,
which should be mounted in-doors.
The Receiver Module verifies and reformats the received satellite data, and offers multiple
synchronization protocol outputs, including a capability to synchronize LTRx-512 Master Clocks to this
highly accurate “Atomic” reference.
Simple DIP-Switch set-up enables the installer to specify Local Time Zone, Daylight Savings Time
corrections, and output formats. An LED indicator shows Signal Reception / Protocol Mode.
Unshielded Twisted-Pair (UTP) Cable (Cat-3 or Cat-5) is suitable to connect the D+/D- Data Output
Terminals of the LTR-GPS to the D+/D- “Sync-In” Terminals on the back of the Master Clock’s Front
Panel Assembly.
The LTR-GPS may receive its power from an LTRx-512-series Master Clock, using a 2
nd
cable pair (as
illustrated below), if the distance is less than 200ft; else, power is provided locally by a 9vAC Power
Adapter.
4000 FT. MAX
200 FT. MAX;
ELSE USE POWER ADAPTER