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S100 User Guide – Rev. D – June 2005 111
2
5
3
How many satellites are necessary for me to operate the S100?
Four. The unit will usually track six to eight satellites.
How do I know if the satellite signal strength is good?
Any signal over 6 is good and usable by the S100. The unit will continue to track a satellite
down to 3 once it has acquired it at a level 6 or over.
What is the maximum antenna cable length for use with the S100?
A maximum length of 300 feet can be used with the standard (Bullet II) antenna. From 300–
500 feet, the High-gain Antenna option is required. If you need longer lengths, please contact
Symmetricom Customer Assistance (see “Appendix D” on page 137
).
Note: The GPS and bullet antennas and antenna cables described in this manual have been
replaced as described in “Appendix E” on page 141
.
What are the available antenna cable lengths and antenna requirements?
Use the following table:
Note: The bullet antenna cable described in this manual has been replaced as described in
“Appendix E” on page 141
.
What are some guidelines for correctly cutting the cable, using splitters, and using cable connectors?
Some critical “do’s and don’ts” are:
• Do use pre-made kits from Symmetricom.
• Do install the antenna where there are no obstructions—either on the roof, or an
unobstructed view of at least 30-degrees above the horizon.
• Do not split the antenna cable signal to try to use the signal to drive other GPS devices.
• Do not cut the cable to a shorter length. Instead, bundle any excess cable. Correct
antenna cable length—even if you do not “use it all”—is critical to proper S100
operation. The cable should have a gain within 15dB–25dB.
Cable length and Type Antenna
50-100 feet (15-30m), Belden RG-58 Standard Bullet-type
100-300 feet (30-91m), Belden 9913 Standard Bullet-type
100-300 feet (91-152m), Belden 9913 High-gain
Over 500 feet (152m) Contact Symmetricom