Redhawk II GSM Modem Users Guide
Draft: 10/30/00
48
Part Number: 07100020 version 00B
© 2000 Xircom, Inc. All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc.
APPENDIX A
Installing the Remote Antenna
There are a number of antennas designed for use with the Redhawk II modem. If
coverage is poor then the use of a remote antenna may be required. Ideally, the
external antenna is mounted on a rooftop, or on the side of a building where optimal
signal strength can be obtained.
Antenna Coaxial Cable and Connectors
In most cases RG223 50 ohms or similar small diameter cable can be used. For
outdoor installations, the coaxial cable must be rated for outdoor exposure.
The antenna connector on the modem is a SMA female and mates with a SMA male
on the coaxial cable. The SMA connector on the modem is gold plated. Use only a
gold-plated SMA male connector when making the connection.
The connectors on the antenna end of the coaxial cable are dependent on the
antenna manufacturer. Typically these are SMA, or Type N connectors. Termination
styles of connectors vary depending upon manufacturer and connector type.
Regardless of connector manufacturer, type and style, solder terminations are
recommended to assure a reliable long-term RF connection.
SMA connectors should be tightened to 8.0 +/- 1.0 inch-pounds using a torque
wrench, to assure proper grounding and connection.
NOTE: SMA connectors are not rated for outdoor environments. Precautions
must be taken to assure that SMA connectors are not exposed to water, liquids
or corrosive environments or electrical failure may result.
For either fixed or mobile applications, if the antenna has less than a 3 dB gain and a
separation distance of greater than 20 cm (7 7/8 inches) from the body of the
antenna, and any nearby person(s), then the installation will comply with current
FCC requirements addressing human exposure to radio frequency electromagnetic
fields.
!
Detailed Information regarding antenna gain, cable length and installation
requirements, can be found in the Installation Manual. Assistance in
Troubleshooting, problem solving, cable loss or antenna gain, can best be obtained
by contacting Xircom, Technical Support Division.
NOTE: The installer is responsible for assuring that the proper antenna is
installed so that the above limits are not exceeded.