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High-Gain WLAN Aerials

Vigor routers equipped with Wireless LAN facilities are supplied with the standard 3dB gain aerials. A higher gain aerial provides a signal gain which can in many circumstances improve your wireless coverage/range as well as your connection speed at longer ranges, particularly where your required coverage area is currently borderline and needs a 'little extra help'.

Uni(single)directional aerials are intended for application where you want the signal in one direction only, either for increased range or for security reasons. By concentrating an aerial in one direction, both transmission strength and receive sensitivity are improved as well as benefits in avoiding interference or traffic from adjacent networks in other directions.

Wireless antenna gain is a complex area and we'd recommend seeking out a specialist site for further details but put simply, aerials are designed in such a way that they can increase the signal output from the transmitter's original output. The output of the Vigor routers wireless module is approximately 17dB (or dBmW), after allowing for any loss from cables and before antennae gain. The standard aerial supplied with the router is 3dB gain.

The modem ANT-2510 is rated for outdoor use and can be used for WDS links between buildings; the antennae connection must be wrapped in self-amalgamating tape in order to waterproof it. The tape is widely available, as used for satellite dish connections.

One or Two?

Most Vigor routers have two aerial connectors, and two aerials as standard. This is for reasons of 'receive diversity' which means (put simply) that a signal suffering from some local interference in one particularly plane, may be better on the other aerial. On a Vigor router with two aerials, the second aerial is for receive only. The main aerial both receives and transmits. Therefore, if you are fitting a replacement aerial, it it not necessary to replace both or have two fitted. If you do have two fitted, however, they should be the same. You can experiment for best performance, particularly with regard to aerial position and angle. The 'main' aerial on the Vigor is normally the socket adjacent to the power switch on the back of the router, but check with your dealer for specific model details.