User Manual

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14
the reader and a splitter, or splitter and antenna, or directly from reader to antenna. The
appropriate cable length is dependent on the type of gate used and type of coaxial cable used.
There are different ways to determine the optimal cable length:
1. use the table in appendix A of this document. In this table the appropriate length for
different types of antennas is given.
2. use a vector impedance analyzer to measure the resistance and reactance of the antenna on
13.1Mhz or 13.9Mhz sidebands. On these sidebands the resistance should be as high as
possible (>150Ω), and the reactance should be zero. See a more detailed description in
appendix B of this document. Possible vector impedance analyzers are:
a. AEA Technology’s Via Bravo handheld
b. Rohde&Schwarz ZVL Vector Network Analyzer (advanced equipment)
3. use an SWR analyzer with the capability to measure resistance and reactance on 13.1Mhz or
13.9Mhz sideband, like the MFJ Enterprises’ MFJ-259B HF/VHF SWR analyzer. The more
detailed description in appendix B of this document, also applies to this device.
When the optimal cable length is determined, roll-up the excess cable length and mount it near the
Eco Reader.
CONNECTING THE ALARM
The buzzer that is delivered together with the Eco Reader should be connected with its red and black
wire to the +24V and BUZ1 pins on connector K8 of the Eco Reader. BUZ1 is an open collector NPN
input that is pulled to ground when an alarm should sound.