Sagem -LINK F Installation And Operation Manual page 21

SAGEM-LINK F
Installation and Operation Manual
The expected receive signal level has previously being determined and depends on frequency,
remote transmit power, local and remote antenna gains, and length hop.
Use the following procedure successively on both ends of the link to align the antenna :
1- Make sure remote transmit power is set in order to avoid overload at receive input (i.e. RSL
less than –20 dBm).
2- Verify that remote terminal is operational
3- Remove the cap on the local ODU BNC connector and connect a voltmeter.
4- Rotate slowly the antenna in the azimuth direction (horizontal) and find the maximum voltage.
If the voltage is around 4.5V (-20 dBm), then diminish the remote transmit power in order to
be in a more linear region.
5- Rotate slowly the antenna in the elevation direction (vertical) until the voltage is maximum.
Record the measured voltage.
6- When maximum voltage has been found, tighten all fasteners, verify that the voltage has not
changed. Replace protective cap on the BNC connector.
7- Compare expected receive level with current receive level. If the difference between expected
and actual receive is more than 5 dB, then it should be necessary to optimize again antenna
alignment, or to check again if polarization is the same on both ends of the link.
Connect a laptop computer to the PC connector and run the Sagem Link F Pilot software.
Normally, the link should be established (no "NO REMOTE RADIO" message displayed). The
main screen should be like that :
Reproduction and communication prohibited without the written permission of Sagem Communication
Bad Alignment
Figure 1.13 : Antenna Alignment
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Issue 04 : July 2005