Symmetricom S100 manual How do I know if the satellite signal strength is good?

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:

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

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.

S100 User Guide – Rev. D – June 2005 111