User Manual

Antenna Tuning
July 2008 Revision 4.2 43/62
6 Antenna Tuning
The successful operation of the L-SP2 depends largely on:
 The antenna being tuned to the correct resonance frequency (impedance),
 Antenna isolation being adjusted to its optimal value.
During on-site tuning, antennas are decoupled to ensure that the minimum amount of energy is
delivered from one antenna to another.
Note that antennas are tuned before shipping and should not require any further adjustments on
site.
After the L-SP2 is completely installed, verify the antenna tuning of each pedestal to ensure that
the tuning process is necessary.
The tuning of the antennas should be verified whenever a pedestal is installed or moved.
The tuning procedure requires some knowledge of the use of equipment such as an oscilloscope,
and should therefore be carried out by a suitably qualified technician.
6.1 Required Materials
6.1.1 TAGSYS Antenna Tuning Kit (not included)
Table 3: Contents of Antenna Tuning Kit
Quantity Description
1
Antenna Tuning Device generating a 0.5 Watt, 13.56 MHz sine wave waveform
2
25-cm RG58 shielded cable with BNC connectors
1
Universal power supply 100-240 VAC to 12DC with European Pins
2
Card-size Field Strength Detector
1
Precision screwdriver to calibrate the Tuning Device
1
BNC 50-Ohm Termination
1
BNC Gender Changer
2
BNC to SMB type changer for EAS Pedestal
1
Antenna Tuning Device User's Guide
6.1.2 Oscilloscope
An oscilloscope (not supplied with the TAGSYS Antenna Tuning Kit) is necessary. It should meet
the following minimum requirements:
It is recommended that an approved TAGSYS technical representative inspect the pedestal
unit at least once per year.
The antennas should be tuned only if necessary. To determine if the tuning procedure is
required, follow the steps listed in section 6.2 “Verifying Antenna Performances”.