TransCore encompass 4, Manual, Page: 52 / 208

Chapter 4 Installing the Encompass 4 Reader
TransCore Proprietary
4-35
• 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 25 ).
2. Connect the RF cable to the antenna (see Item 1 in Figure 26 ).
3. Short the outer metal case of the load or attenuator to Earth Ground for approximately 10 seconds (see
item 2 in Figure 26 ). In this example, the operator is using the mounting screw of the electrical outlet
faceplate for Earth Ground.
4. Remove the load or attenuator from the RF cable and connect cable to reader.
Once the antenna is discharged and properly connected to the reader, the reader circuitry provides a
DC path to keep any further charge from building up in the antenna.
Figure 25 Connect RF N-type Load or Attenuator to Reader Cable End
Figure 26 Short Load to Earth Ground