User's Manual

Table Of Contents

6.5. Start up

Connect a power supply to the installed FOD unit and connect the configuration PC. Use an internet

browser (such as Mozilla Firefox) to enter the configuration menu.

6.5.1. Noise on the site

This is particularly true for installation of links working in free bands, where the user has no secured

frequency.

Analyse the level of noise in the individual channels using the spectrum analyzer under Tools – Live

data – Frequency spectrum analyzer. If necessary adjust the choice of working channel on the basis

of the results.

While doing so respect the rule that in one location all units emit a signal in the Upper part of the range

and receive it in the Lower part of the range, or the other way round. A transmitter must not be installed

in the part of the spectrum where other units function as receivers.

6.5.2. Directing antennas

If it is possible, use a narrow channel, low modulation and high power for the first antenna directing

alignment. Working on both ends of the link simultaneously is favourable. Connect a voltmeter to the

connectors and observe RSS changes in 2 V DC range. A stronger signal corresponds to lower voltage.

Alternate units on both sides and slowly adjust the antenna vertically and horizontally to find the position

with the strongest reception. At the same time look for the main signal maximums. To differentiate

between the main and the side maximums refer to the Main and side lobes paragraph.

RSS measurement

For correctly setting the bridge and positioning it in the right direction it is advisable to connect a PC

and use the diagnostic capabilities of the RAy2 station. In uncomplicated cases it is enough to connect

a voltmeter via connectors and adjust to the lowest indicated voltage. Voltage is calibrated according