screw-holders fit the right position for all 4 screws. Carefully ensure the correct polarization of the unit
and secure the RAy unit in place with all four bolts. Finally, gently tighten the bolts with a No. 6 Allen
key.
Important
Gently tightening all 4 screws is enough. Do not over-tighten any screw, it may damage the
protective color surface of the aluminum unit (enforcing corrosion processes) and in the case
of an extreme force also deformations of the RAy aluminum cover may happen. Later de-in-
stallation of the unit then becomes difficult.
Please ensure that all 4 screws are tightened equally during tightening and the gap between
RAy screw-holders and spacers on all 4 sides of the RAy unit is approximately identical. Too
strong tightening of one or 2 screws on one side of RAy unit may lead to the deformation of
the sensitive zone of the waveguide between the antenna and the unit, resulting in weaker
radio parameters.
Even a small residual gap between RAy unit and the antenna is OK, because important is a
good connection of waveguide – it is good enough even with screws gently tightened.
Note
On older LEAX-RAy antennas (shipped during the year 2017) the residual gap under each
screw-holder on RAy and antenna body may be up to 1 mm.
4.3.3. RAy unit grounding
RAy unit has to be properly grounded, otherwise its function cannot be guaranteed and the unit can
be even damaged. Grounding connection through antenna and its holder is not enough (due to color
surface, oxidation etc.), thus a separated grounding is required to ensure the perfect galvanic connection.
The RAy grounding kit
25
equipped with 85 cm of cable with grounding lugs and grounding
terminal ZSA16 with 50 cm grounding strip 15 mm wide is ideally suited for this.
Important
The RAy unit has to be grounded before connecting to the power supply and/or to the user
network.
Typically the unit is grounded to the antenna mast, which has to be properly grounded (according to
Fig. 4.20, “Grounding installation 1”
and
Fig. 4.21, “Grounding installation 2”
, where unit grounding to
the antenna mast is marked by yellow-green cable).
The RAy unit must be grounded by an insulated copper cable with a minimum cross-section of 6 mm
2
terminated with a terminal lug fixed to the RAy unit by M8 grounding screw. It is marked by yellow
located on RAy flange nearby fixing ears (place for fixing screws). The conductor should have a
green/yellow plastic cover along its whole length and its other end should be ended by an appropriate
grounding terminal. For instructions on installing terminals see
26
. The antenna
and the unit grounding must be installed by a qualified person.
25
https://www.racom.eu/eng/products/microwave-link.html#accessories_zemneni
26
https://www.racom.eu/download/hw/ray/free/eng/07_prislusenstvi/GND-RAy.pdf
RAy3 Microwave Link – © RACOM s.r.o.
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Installation
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