User Manual

12
Connecting External Antennas
The rear panel provides nine coaxial antenna connectors. Each connector
accommodates a single external antenna. Figure 2 shows the external
antenna connections to the scanner.
I The U519 can be used with fewer than six antennas. Install antennas
sequentially, starting with the left-most connector.
Placing the Antenna
Antenna placement is critical to ensure information is written to and read
from tags accurately. Observe the following guidelines when placing
the antenna:
Locate the antenna away from metal objects, microwave ovens, and
other devices that may induce radio frequency interference. In addition,
make sure there are no metallic surfaces between, or in relative proximity
to, the scanner and tag. For additional placement considerations,
refer to “RF Communications” on page 23.
When reading, the antenna should be placed no more than 84
inches from the objects bearing tags. When writing, the antenna
should be no more than 5 inches from objects bearing the tag.
The front of the antenna must be free of obstructions.
Otherwise, information may not be written to and read from tags
accurately.
I Tags must reside within the scan field for at least 3
milliseconds for information to be retrieved from them.
U519 Manual.p65 10/27/2000, 4:35 PM12