EndRun Sonoma D12, User Manual

Page: 151 / 172

S o n o m a U s e r M a n u a l 135
"Smarter Timing Solutions"
Appendix
E
Installing the CDMA Antenna
Installing the CDMA Antenna is usually very easy, simply mount on top of your equipment rack inside
your building. This appendix contains antenna mounting guidelines in case you encounter problems
receiving a signal.
Antenna Location
Place the antenna on a flat, preferably metallic surface while the unit is searching for the signal.
Make sure that it is not blocked by large metallic objects closer than one meter. The Sonoma Sync
LED should follow the sequence below within 20 minutes.
Acquire and Lock Status Sequence
The Lock LED on the front-panel shows the status of the CDMA Subsystem/Receiver as it acquires
and locks on to a signal:
1. The Sync LED is solid amber while not detecting a signal.
2. When the unit has detected a CDMA signal, the Sync LED will flash very slowly (about a .4 Hz
rate).
3. As the unit locks onto the CDMA signal and begins to decode the timing data, the Sync LED will
flash very rapidly (about a 6 Hz rate) until the data is fully decoded.
4. Once the Sonoma is fully locked to a signal, then the Sync LED will pulse at precisely a one sec-
ond rate, synchronized to UTC seconds.
If your Sonoma does not lock within 20 minutes, then you should move the antenna or change its
orientation as described below.
Moving the Antenna
Although the antenna should normally be installed in a vertical orientation, usually multipath condi-
tions due to signal reflections indoors cause at least some of the signal to be horizontally polarized, so
do not be surprised if you find that the unit will work with the antenna oriented either way.
Multipath conditions can also cause another effect: signal cancellation. Since the wavelength of the
signal is only about 12 to 30 centimeters, movement of the antenna just a few centimeters can some-
times cause significant signal strength changes.