Cypress DPX-5510 Panduan Pengoperasian - Halaman 11

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A site evaluation should have determined the optimal locations for the Central and Remote

units, the type of antennas that would be needed, and the frequency band to be used.

(See Cypress Application Note "Site Evaluation for Duprex RF products").

This section of the document covers units that utilize the enclosure mounted1/2 wave whip

antenna. For other types of antennas there will be specific documentation to cover their

different installation issues.

We are now ready to physically mount the units and make the electrical connections to

complete the installation.

The units should be mounted so that the length dimension of the antennas are in the same

plane. The orientation of the antenna will determine what is referred to as the polarization of

the signal. Significant reduction in range can result if the units are not of the same polarity.

See below.

Both Central and Remote units are arranged so the antennas are parallel in direction. As shown in this

illustration we would say they are both vertically polarized. Since the polarity is in the same direction,

the signal strength would be maximized.

In this instance one of the units is vertically polarized, and the other is horizontally polarized. The signal

would be greatly reduced thereby reducing the maximum distance between units.

The installer should make sure that both units are mounted so that the polarization will be the same for

both units.

In all cases the antennas MUST be mounted at a distance of 20 cm or

greater

from any nearby persons

Mounting the units.

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