User's Manual

Navini Networks, Inc. Ripwave Base Station I&C Guide
59
Install GPS Antennas
Check all regulatory standards (refer to Chapter 1, Page 8 “Regulatory Information”) prior to
installation.
As mentioned earlier, the model of GPS antenna used with the Ripwave Base Station is the VIC
100, as shown in Figure 27.
Mount each GPS antenna module, run the cable through the pipe clamp mount. Connect the
cable to the GPS antenna, then, weatherize the connection. Secure the antenna module to the
pipe clamp mount using the captive mounting hardware. Install the GPS antenna module and the
pipe clamp mount to the mounting pipe and tighten the two mounting screws.
Make sure that the total loss from the GPS antenna to the SYN card in the BTS (including main
cable, jumper cable, splitter, lightning arrestor, etc.) does not exceed 11 dB.
The mounting location for the GPS antenna is determined during the site survey. When
installing, ensure that the following requirements are met:
• The voltage measured on the coax cable at the point at which the GPS antenna unit is
to be mounted (not at the rear of the BTS, but at the end of the cable run must be greater
than 4.5 Volts.
• The GPS antenna is located to provide the widest view of the sky (objects such as
buildings or trees can interfere with signals from the satellite).
• The number of satellites visible to the GPS antenna must be 6 or greater.