R T M 3 2 0 5 U s e r M a n u a l
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C H A P T E R T W O
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R T M 3 2 0 5 U s e r M a n u a l
B A S I C I N S T A L L A T I O N
NOTE
RTM3205 has an OCXO oscillator (MS-OCXO, HS-OCXO, or US-OCXO) so it will require a 5-10 minute
warm-up period before it begins searching for a GPS signal.
4. Then the Sync LED will pulse at precisely a 1 Hz rate, synchronized to UTC seconds.
At this point, the GPS Subsystem is fully synchronized, and you may proceed to permanently mount-
ing the chassis and antenna in their desired locations. If you are unable to achieve GPS lock after 24
hours, then contact EndRun Customer Support for assistance.
NOTE
In order for the RTM3205 to synchronize with maximum accuracy to UTC, the delay for the cable and all
devices between the antenna and the GPS receiver must be compensated. See
Appendix E - Installing
the GPS Antenna, Calibrate Your Receiver
for more information.
Installing the RTM3205
Mount the unit in the desired location. After mounting the unit and connecting the antenna cable,
verify that it still acquires and tracks a GPS signal. Refer to the baseplate drawing in
Appendix K
- Specifications
for the mounting hole locations.
CAUTION
Power cable is used as a disconnection device. To de-energize equipment, disconnect the power cable. Do
not install the RTM3205 where the operating ambient temperature might exceed 122°F (50°C).
The RTM3205 internal temperature must not exceed 70˚C, as measured by the built-in temperature sensor
accessible via the “oscctrlstat” serial port command. Internal temperature will remain in safe range if all
conditions are met:
A. Base plate is in good thermal contact with external enclosure.
B. Ambient air temperature surrounding RTM3205 GPS Timing Module enclosure is < 50˚C.
C. Adequate clearance around RTM3205 enclosure allows for free-convection around cover.
D. No additional thermal sources via adjacent mechanical contact.
Condition A must be met. If condition B and/or C and/or D cannot be met as stated, use built-in tempera-
ture sensor to verify adequate operating margins.
Summary of Contents for RTM3205
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