ThingMagic Astra-EX - Manual (Page 71)

Mounting the Reader
M6 and Astra-EX User Guide 71
Tag Considerations
There are several variables associated with tags that can affect Reader performance:
 
Application Surface: Some materials, including metal and moisture, interfere with
tag performance. Tags applied to items made from or containing these materials
may not perform as expected.
  Tag Orientation: Reader performance is affected by the orientation of the tag in
the antenna field. The ThingMagic antenna is circularly polarized, so it reads
face-to but not edge-to.
  Tag Model: Many tag models are available. Each model has its own
performance characteristics.
Multiple Readers
The Reader adversely affect performance of 900 MHz devices. These devices also may
degrade performance of the Reader.
  Antennas on other Readers operating in close proximity may interfere with one
another, thus degrading performance of the Readers.
 
Interference from other antennas may be eliminated or reduced by using either
one or both of the following strategies:
 Affected antennas may be synchronized by a separate user application using
a time-multiplexing strategy.
 Antenna power can be reduced by reconfiguring the RF Transmit Power
setting for the Reader.
Note
Performance tests conducted under typical operating conditions at your site are
recommended to help you optimize system performance.