Satel SATELLINE-EASy Podręcznik Użytkownika Pobierz pdf (Strona 91)

SATELLINE-EASy Pro

User Guide v.1.5

withstand all foreseeable weather conditions (frost, excess sun, direct UV-radiation, seawater etc.).

Also possible environmental pollution must be considered (acids, ozone etc.).

Antennas must be installed well away from metallic objects. In the case of small antennas this

distance should be at least ½ m. With large antennas the distance should be >5 m and in case

of repeater antenna combinations >10 m.

If the system contains a large number of radio modems, the best location for an antenna is the

highest point of a building and possibly an additional antenna mast. If a separate antenna mast is

used, the antenna can, if necessary, be installed sideways about 2…3 m from the mast itself.

When installing an antenna possible interference sources must be considered. Such interference

sources are, for example:

 mobile telephone network base station antennas

 public telephone network base station antennas

 television broadcast antennas

 radio relay antennas

 other radio modem systems

 PC-related devices (approximately 5 m radius from antenna)

When ordering antennas we request you to note that antennas are always tuned to a specific

frequency range. Simple antennas and antennas, which have been constructed of stacked yagi-

antennas, are typically rather broadband. As the number of yagi-elements increases the frequency

range becomes narrower. Note this specially with 35W.

When designing and installing a system it is advisable to prepare to test the system, and also to

consider serviceability of the system. In particular cabling should be planned to allow easy access

and to allow for maintenance. It is often practical to use long antenna cables, so that the radio

modem can be installed far enough from the antenna itself to a location that is easily accessible

(see section 10).

The type of the antenna cable is dependent on the length of the antenna cable, and the following

table can be used to select a suitable type:

Length

Type

Attenuation 10m/450MHz

<5m

RG58

3.0dB

0…20m

RG213

1.6dB

>20m

ECOFLEX10

0.9dB

>20m

AIRCOM+

0.8dB*

>20m

ECOFLEX15

0.6dB

*) AIRCOM+ cable is partially air insulated, so the use of this cable requires that the connection

between the cable and the connectors are fully airtight.

If there is a line-of-sight path between the antennas a 6 dB power marginal is usually adequate.

However, if the connection is built on the reflection and/or the knife-edge diffraction the path loss

can vary even 20 dB depending on the weather conditions. In this case a short test can give a too

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