EndRun Sonoma N12, Руководство пользователя

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S o n o m a U s e r M a n u a l 6
C H A P T E R T W O
7 S o n o m a 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
Performing a
Site Survey
Using the front panel status LED indicators, it’s easy to find out if your Sonoma will work in your
desired location:
1. Screw the TNC plug on the end of the antenna cable onto the TNC antenna input jack on the chas-
sis rear panel of the Sonoma.
2. Plug one end of the supplied AC power cord into an 85-270 VAC outlet.
3. Plug the other end into the AC input connector on the chassis rear panel of the Sonoma.
Place the antenna in a window, or for best performance, mount it on the roof using the supplied
mounting hardware. For detailed information on GPS antenna installation see Appendix E - Install-
ing the GPS Antenna
.
Initially upon power up:
1. The unit will light the Alarm LED for about 10 seconds.
2. Then it will continuously light the Sync LED.
3. When the unit locks onto a GPS signal and begins to decode the timing data and adjust the system
oscillator, the Sync LED will flash very rapidly (about a 6 Hz rate) until the data is fully decoded and
the system oscillator is fully locked to the GPS frequency.
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 this sequence has not occurred within twenty-four hours, and you have mounted your antenna in a
window or your rooftop installation has poor sky visibility, you may need to provide an accurate ref-
erence position to the unit so that it can operate with only one satellite in view. If you have mounted
the antenna in a window and can easily move it to the rooftop, you should do that first. Should you
need to provide a reference position to the unit, refer to Appendix E - GPS Reference Position and
the
setgpsrefpos
command for details.
If you are unable to achieve GPS lock after trying all of these suggestions, then contact EndRun Cus-
tomer Support for assistance.
NOTE TO PRECISION TIME PROTOCOL (PTP) USERS
If you want to maximize timing accuracy, see
Appendix E - Installing the GPS Antenna, Calibrate
Your Receiver .