Chapter 4 Installing the Encompass 4 Reader
TransCore Proprietary
4-49
Mounting the Antenna
If you are using the Encompass 4 Reader that requires an external antenna in permanent installations,
the antenna should be positioned as closely as possible to the Encompass 4 Reader. Long cable runs
increase system sensitivity to noise. See
“Table 4 Recommended Cable Length from Transformer to the
Encompass 4 Reader” on page 2–17
Before you connect the external antenna to the Encompass 4 Reader, you must perform the following
voltage discharge procedure.
Discharging Voltage from the External Antenna
Use these instructions to discharge high voltage from the external antenna before proceeding with further
pre-installation testing of the reader connected to an external antenna.
Required Equipment
This procedure requires the following equipment.
•
TransCore Encompass 4 Reader (external antenna models only)
•
External antenna
•
RF cable
•
N-type load (e.g., 50
Ω
) or RF attenuator (e.g., 20 dB)
Discharging the Voltage
1. Terminate the reader end of the RF cable with any N-type load or RF attenuator (
).
Figure 40 Connect RF N-type Load or Attenuator to Reader Cable End
Содержание encompass 4
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