both sides of the link and to reach pre-calculated RSS value (which is typically calculated before the
link is physically established to ensure necessary link transmission parameters could be met).
• Several available methods to measure RSS are built in to the RAy unit. Those are discussed in detail
in section
Section 4.7.3, “RSS measurement”
• Connect a PC, tablet, mobile or voltmeter according your preferred RSS measurement method and
find the best possible antenna alignment for both sides of the link. Following section Main and side
lobes would help you.
Main and side lobes
Directional antennas have a specific angle within which radio waves can be transmitted or received
(Angle of TX/RX).
The strongest signal is emitted in a forward direction; the main lobe is a graphical representation of its
direction of travel and strength. However, signals are also emitted and received from unwanted directions
through side lobes. In receiving antennas this is a highly significant factor contributing to the level of
interference in a radio network (See
Fig. 4.30 Antenna lobe diagram
).
Fig. 4.31 Signal strength graph
provides an indication of comparative signal strength from different
beams emitted from a directional antenna.
A n t e n n a
Angle of T / R
x
x
M a i n l o b e
B a c k l o b e
S i d e l o b e s
0
90
-90
0
0
0
Fig. 4.30: Antenna lobe diagram
0
-180
Angle (Degrees)
Directivity (dBi)
Main lobe
Side lobes
Side lobe
level
180
30
60
-60
-30
Fig. 4.31: Signal strength graph
73
© RACOM s.r.o. – RAy3 Microwave Link
Installation
Summary of Contents for RAy3-11
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