User's Manual

302395 User’s Guide and Repeater Network Design Guide
24 February 2004
3.5.2 Recording Antenna Characteristics
When you have isolated your network problem to a single access point, record the specifications for that
access point’s antenna.
What are the characteristics of the antenna on the mobile access point that you are evaluating?
Antenna Characteristics
Antenna type: omnidirectional
sector
parabolic
Antenna gain: __________ dBi
If a sector antenna,
horizontal pattern:
90 degrees
120 degrees
Angle between antenna
and no coverage area:
*
__________ degrees
*
What is the angle between the areas of heavy no
coverage clusters and the repeater antenna?
Refer to the RF Theory section of the MasterLink Design Manual for detailed information on antenna
types, patterns, and ranges.
3.6 Obtaining Additional Guidance
Before contacting regional support for assistance you will want to collect all relevant information on the
condition of your network.
When you discover a no coverage area in the mine, answer the following questions:
1. Is the no coverage area in a new mine operations area?
2. Has the mine recently altered the network? (For example, has a mobile access point been moved?)
3. Are the antennas that serve the no coverage area operating properly?
4. Does any structure or terrain block the signal?
5. Does the no coverage area fall within the primary horizontal and vertical signal lobes of the antenna
serving the area?
Note: To measure antenna angles you will need to take simple field measurements
with a protractor or bubble level device.
For major changes in mining operations, you may need to add additional access points. Contact your
regional Modular Mining Systems support office if you think this is the case.