User's Manual

© Copyright 2003 RF Code, Inc. All rights reserved. UM-C2020-R02-20030422.
No copying of this material is allowed without prior written permission. Page 9 of 27.
USER MANUAL – Mantis™ II 433.92MHz Reader
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Depending on the location and orientation of the tags, the signal path to the
Reader may vary for each Tag. This may allow only one antenna to receive
the signal.
To achieve the best receiver diversity:
• Antenna Angle from Reader – It is desirable to have the antennas
positioned at different angles from the Reader.
• Antenna Angle from Each Other – Antennas should be at 90-
degree angles relative to each other. It may be necessary to
experiment with antenna positions to achieve optimum coverage.
• Height – As a rule, the higher a Reader is positioned above the
ground or floor, the better the Reader’s detection range.
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WARNING – Do not allow antennas to overlap. Keep the antennas
separated. Allowing the antennas to overlap reduces the
effectiveness of each antenna.
To minimize RF interference:
• Separation – Maintain a 4-to-6-foot separation between the Reader
antennas and potential RF radiators such as computers, monitors,
printers and electronic office equipment. The local radio environment
can limit the Reader’s effective range.
• Height – Do not operate the Reader on or close to the floor or
ground. Grounded and reflective metallic structures around the
Reader and/or Tags affect the system performance. For best results,
the Reader should be mounted as high as reasonably possible.
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WARNING – Readers should not be positioned close to ceilings as
they act as ground planes.
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TOOLS – Low loss SMA coaxial extension cables may be used to
separate the antennas from the Reader.
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NOTE – Optional antennas that offer diverse receiving properties or
extend the range of the Reader are available for the Mantis™ II
Reader. Contact your Mantis™ II Reader distributor.