AirLink Communications Raven X HSDPA Guia do Utilizador descarregar pdf (Página 101)

Raven X HSDPA for Cingular - User Guide, version 2.33 96

Frequently Asked Questions and Technical Support

The optimal range for AirLink modems is an RF Coverage (RSSI value) of -60 to -95. RF coverage

between -95 to -105 DBm will often still register, however functionality at this range can be greatly

reduced and registration can become difficult. Any devices with an RSSI below -105 DBm will

likely fail to register on a regular basis.

When addressing RF coverage ensure the antenna choice is appropriate for the device and frequen-

cies required.

Antennas for cellular communication are commonly omni-directional and either dual-band or

multi-band. They come in a variety of shapes and mounting confirgurations to suit several differ

ent types of needs.

While AirLink does sell a limited selection of antennas and antenna accessories, these are by no

means all that are available or usable with your Raven X. There are several suppliers of cellular

accessories with a much wider selection of antennas designed to cater to a broader variety of situa

tions.

Dual-band

Dipole

Dipole is a common antenna type connecting directly to the Raven X and extending out in a single

straight wire.

The short dipole antenna (also known as a “rubber duck”) is a good desktop, portable antenna for

use in areas with good signal strength and low electrical interference.

Mounts

Antennas can be mounted in a variety of ways (magnet, permanent, suction to a window, sticky

tape, etc) which can allow you to move the antenna away from the Raven X with a coax cable

between the modem and the antenna allowing the antenna to be placed in a more suitable location

for proper cellular reception: outside of a metal cabinet, the trunk lid of a car, a window, etc. A

What is the Proper RF Coverage for my Raven X?

What Type of Antenna is Best for my Raven X?

Antennas selected should not exceed a maximum gain of 5 dBi under standard installation config-

uration. In more complex installations (such as those requiring long lengths of cable and/or multi-

ple connections), it’s imperative that the installer follow maximum dBi gain guidelines in

accordance with the FFC’s, regulations.

For cellular communication, the Raven X requires a dual band antenna supporting both 800 MHz

and 1900 MHz (1.9 Ghz) bands.

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AirLink Communications Raven X HSDPA Guia do Utilizador Página 101