Specifications

iv MDS 4790/9790 Series™ I/O Guide MDS 05-3438A01, Rev. E
MDS 4790/970—Front End Helical Coil Alignment.........................87
8.5 Testing and Removing an Internal Duplexer ...................................87
Testing.............................................................................................87
Removing the Internal Duplexer......................................................88
8.6 Testing and Removing the Antenna Switch Module .......................89
Testing.............................................................................................89
Removing the Antenna Switch........................................................90
8.7 Cooling Fan Maintenance .............................................................91
9.0 RADIO SOFTWARE UPGRADES ........................................................91
9.1 Obtaining New Code ......................................................................91
9.2 Preparing for Download .................................................................92
9.3 Downloading New Code—Procedure ............................................92
10.0 TECHNICAL REFERENCE.................................................................93
10.1 Technical Specifications ...............................................................93
10.2 RF Propagation Planning .............................................................95
Fresnel Zone Clearance..................................................................96
Earth Curvature ..............................................................................97
Fade Margins ..................................................................................97
Calculating Path Loss .....................................................................98
10.3 Formulas for System Planning .....................................................98
Free Space Path Loss.....................................................................98
Fresnel Zone Boundary ..................................................................98
Theoretical Signal Strength.............................................................98
Probability of System Fading ..........................................................99
10.4 dBm-Volts-Watts Conversion Chart ............................................100
Copyright Notice
This Installation and Operation Guide and all software described herein
are protected by copyright: 2005 Microwave Data Systems Inc. All
rights reserved.
Microwave Data Systems Inc. reserves its right to correct any errors and
omissions in this publication.
Operational Safety Notices
The radio equipment described in this guide uses radio frequency trans-
mitters. Although the power level is low, the concentrated energy from
a directional antenna may pose a health hazard. Do not allow people to
come in close proximity to the front of the antenna when the transmitter
is operating.
This manual is intended to guide a professional installer to install,
operate and perform basic system maintenance on the described radio.
RF Exposure