DAVIS SPREAD-SPECTRUM RADIO MODEM Manuel d'instructions télécharger pdf (Page 17)

Installation Page 17

Installing Directional Antenna

The directional antenna may be mounted in either the vertical or horizontal

plane. If it is communicating with an omni-directional antenna it must be

mounted in the vertical plane. If communicating with another directional

antenna, the two may be either vertical or horizontal; both must be in the same

plane, however.

Note:If an interfering radio source is nearby it will be helpful to orient the antennas opposite (orthog-

onal) to the plane of the interference. AM radio transmissions are typically vertically polarized,

so horizontal antennas will better reject AM radio interference. Television and FM radio trans-

missions are usually horizontally polarized, so vertical antennas will better reject TV and FM

radio interference.

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DAVIS SPREAD-SPECTRUM RADIO MODEM Manuel d'instructions Page 17