User's Manual

InfiNet Wireless R5000 Technical User Manual

General recommendation for antennas placement are the following:

• Install antennas as high as possible over specific level. In case of flat

surface - it will be ground level, in case of vegetation and forest – it will

be tree heights, in urban environment – it will be the highest building in

the observed area (specific level definition).

• Avoid tree and vegetation along with wave propagation path, influence

of trees can increase depending on seasons (ice, dew, leaves);

• Proximity of other antennas should be avoided (at least 2 meters);

• Reflecting surfaces should be considered (building with reflective

windows, water surfaces or wet grounds);

• When installing antenna over water surface, one should tune height

bracket within 1-3 meter range variation, because it can yield signal level

variation from minimum to maximum.

• If seasonal changes influence on the signal quality, so then the most

probable reasons would be either the connectors are not protected

enough from humidity, summer vegetation or ice covered cabling and

connectors during winter.

Antenna poles usage

Antenna installation is performed on a special facility called antenna pole. The

pole is used for strong antenna tightening at the installation site. Poles might

have different modifications depending on the installation requirements.

Poles with Stretching

Usually this kind of poles are used when installing antenna on a flat surface and

permits one to raise it to a significant height for providing optimal conditions for

signal propagation.

Wall Mounted Pole

Usually these kinds of poles are used when there is no need to elevate antenna

to the rooftop and there is the possibility to mounting it on a wall. This

installation is significantly simpler than that implementation with poles. Mostly it

is used for subscriber side deployments.

Antenna Poles Requirements

Ease of antenna mounting and sufficient mechanical durability should provide

reliable fastening in conditions of high windy loads. Poles should have round

profile for ease of azimuth adjustment. Typical pole diameter is 30 to 50 mm.

Grounding

Antenna should be placed on the mast on the level that is at least 1 meter lower

than a mast’s top. In this case it is of big probability that the lightning strikes the

mast and not the antenna. The mast is to be grounded on the grounding contour

according to your local standards. When the lightning strikes the antenna, the

current goes through the coaxial cable which grounds ODU clamp with the mast

– the mast is grounded via the grounding contour. The direct lightning strike to

the STP service cable (ODU-IDU) is partially terminated on the grounded IDU

case. Partial termination means that the direct lightning strike will probably

destroy an STP cable. The service cable pickups from the electromagnetic