iv
MDS 4790/9790 Series I/O Guide
MDS 05-3438A01, Rev. F
MDS 9790—Bandpass-Type Duplexers ......................................... 90
MDS 4790/9790 Simplex Radios—With Antenna Switch Modules. 91
MDS 4790/970—Front End Helical Coil Alignment......................... 91
8.5 Testing and Removing an Internal Duplexer .................................. 91
Testing............................................................................................. 91
Removing the Internal Duplexer ..................................................... 92
8.6 Testing and Removing the Antenna Switch Module ....................... 93
Testing............................................................................................. 93
Removing the Antenna Switch........................................................ 94
8.7 Cooling Fan Maintenance ............................................................. 95
9.0 RADIO SOFTWARE UPGRADES ........................................................ 95
9.1 Obtaining New Code ...................................................................... 95
9.2 Preparing for Download ................................................................. 96
9.3 Downloading New Code—Procedure ............................................ 96
10.0 TECHNICAL REFERENCE................................................................. 97
10.1 Technical Specifications ............................................................... 97
10.2 RF Propagation Planning ............................................................. 99
Fresnel Zone Clearance ...............................................................100
Earth Curvature............................................................................. 101
Fade Margins ................................................................................ 101
Calculating Path Loss ................................................................... 102
10.3 Formulas for System Planning ................................................... 102
Free Space Path Loss................................................................... 102
Fresnel Zone Boundary ................................................................ 102
Theoretical Signal Strength........................................................... 102
Probability of System Fading ........................................................ 103
10.4 dBm-Volts-Watts Conversion Chart ............................................ 104
Copyright Notice
This Installation and Operation Guide and all software described herein
are protected by copyright: 2008 GE MDS. All rights reserved.
GE MDS 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
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-8457-MDS-UP-9790X.aspx
