RTcom Radio Modems Bedienungsanleitung PDF herunterladen (Seite 8)

Antenna Installation :

The type and location of the antenna used can have a profound effect on your overall system performance

and its legality.

In point to point links, it is good practice to make efficient use of the radio spectrum by selecting an antenna

that will project the RF energy into the direction of desired operation and similarly at the receiver to collect

transmissions only from the location of the transmitter.

(

Directional Ya

i antenna

(

verticall

olarised

)

(

Directional Ya

i antenna

(

verticall

olarised

)

In polled systems, where there is a central base station, the base station will need an omni-directional

antenna. However, the outstations may still employ a directional antenna pointing back to the base station.

( Omni-direction antenna (vertical polarised))

(

Directional Ya

i antenna

(

verticall

olarised

)

For mobile systems the only practical choice is to use omni-directional antenna at all stations.

It is very important that all antennas in a system share the same polarisation otherwise losses of up to

30dB may be encountered

Note: Polarisation can be put to good use when it is desirable to reject an unwanted transmission on the

same or a similar frequency.

Warning: The use of gain antenna in some countries is not permitted. Similarly, where ERP (transmitter

power limits) are imposed, the actual transmitted power must not exceed the limit stated. This means that

the transmitter output power, less any coaxial feeder losses, plus the antenna gain must not exceed the

specified maximum ERP. Before installing your system, please check!

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RTcom Radio Modems Bedienungsanleitung Seite 8