User Reference and Installation Guide
3-8
© 2006 Microwave Data Systems Inc. All Rights Reserved.
MDS FOUR.9 Series
05-4561A01, Rev. A
location does not mean that you can establish a quality radio link to that location.
Microwave Data Systems provides a link planner spreadsheet that calculates the Fresnel
ratio and helps determine link feasibility. Contact your technical support representative
for a copy of the spreadsheet.
Determine ODU Mounting Requirements: ODUs can be mounted on an antenna mast,
brick, masonry or wall. Refer to detailed installation sections.
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Determine SDIDU
TM
Installation Location: SDIDUs
TM
can be installed tabletop or cabinet,
wall mount, or rack mount. The site must provide DC power or an optional AC/DC
converter may be used. Refer to detailed installation sections.
•
Document Potential Sources of Co-location Interference: When ODUs are located on a
roof or pole with other transmitters and receivers, an interference analysis may be
required to determine and resolve potential interference issues. The interference analysis
needs to be performed by an RF engineer. The specific information required for each
transmitter and receiver includes the following:
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Transmitting and/or receiving frequency
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Type of antenna
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Distance from ODU (horizontal and vertical)
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Polarity (horizontal or vertical)
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Transmit power level
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Antenna direction
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Measure the Link Distance: The two ways to measure link distance are as follows:
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GPS: record the latitude and longitude for the near and far ODU sites and calculate
the link distance. Record the mapping datum used by the GPS unit and ensure the
same mapping datum is used for all site evaluations in a given network.
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Range finder: measure the link distance (imperial or metric units may be used).
Once the link distance has been measured, verify that the link distance meets the
availability requirements of the link. Microwave Data Systems has created a spreadsheet
tool that calculates the link availability based on the details of the link. The Microsoft Excel
spreadsheet is available on Internet, at http://www.microwavedata.com/, and is shown on
the following page. The following parameters should be entered (items in yellow):
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Operating Frequency: Enter 4900
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Transmit Antenna Gain: Enter the gain of the external antenna.
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Transmit Output Power: Selectable b5 to +23 dBm in 1 dB steps.
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Receive Antenna Gain: Enter the gain of the external antenna if used.
Summary of Contents for FOUR.9 Series
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