8
MDS 4790/9790 Series I/O Guide
MDS 05-3438A01, Rev. F
The test can be performed by installing a radio at each end of the pro-
posed link and checking the RSSI value reported at the radio’s front
panel display (refer to
“Front Panel Indicators” on Page 27
). If you do
not obtain adequate signal strength, it might be necessary to mount the
station antennas higher, use higher gain antennas, or select a different
site for one or both stations.
To prepare the equipment for an on-the-air test, follow the general
installation and operation procedures given in this guide and become
familiar with the operating instructions provided in
Section 5.0,
START-UP AND OPERATION, beginning on Page 26
.
A Word About Interference
Interference is possible in any radio system. However, since the
MDS 4790/9790 Series is designed for use in a licensed system, inter-
ference is less likely because geographic location and existing operating
frequencies are taken into account when allocating frequencies.
The risk of interference can be further reduced through prudent system
design and configuration. Allow adequate separation between frequen-
cies and radio systems.
Keep the following points in mind when setting up your radio system:
1. Systems installed in lightly populated areas are least likely to
encounter interference; those in urban and suburban environments
are more likely to be affected by other devices operating on nearby
frequencies.
2. Directional antennas should be used at the remote end of the link.
They confine the transmission and reception pattern to a narrow
beam, which minimizes interference to and from stations located
outside the pattern.
3. If interference is suspected from another system, it might be helpful
to use antenna polarization that is opposite to the interfering sys-
tem’s antennas. An additional 20 dB (or more) of attenuation to
interference can be achieved by using opposite antenna polarization.
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