User Manual

Antenna Tuning
July 2008 Revision 4.2 47/62
6.3.2 Using an Impedance Analyzer
If an impedance analyzer is available, connect each antenna in turn directly to the impedance
analyzer and tune the antennas in the following order: top, center and then bottom.
Figure 30: Antenna Tuning (Impedance) using an Impedance Analyzer
EAS Pedestal
EAS PedestalEAS Pedestal
EAS Pedestal
Network Impedance Analyzer
Network Impedance AnalyzerNetwork Impedance Analyzer
Network Impedance Analyzer
Top
Antenna
Center
Antenna
Bottom
Antenna
Calibration Plane
(50 Ohms + 0j)
BARRF Out
Transmission/Reflexion Set
Transmission/Reflexion SetTransmission/Reflexion Set
Transmission/Reflexion Set
RG-58 Cables
Adjust the trimmer capacitor (Figure 28) of each antenna for best impedance until the impedance
reaches 50±5 + 0j±5 Ω at 13.560 MHz.
Continue the tuning process by checking the antenna isolation (see section 10.4“Adjusting the
Antenna Isolation”).
Figure 31: Impedance Values using an Impedance Analyzer
Poor Impedance
Good Impedance