4RF Limited SRN0400025A ユーザーズマニュアル
46 | Preparation
Aprisa SR User Manual
Path Planning
The following factors should be considered to achieve optimum path planning:
Antenna Selection and Siting
Coaxial Cable Selection
Linking System Plan
Antenna Selection and Siting
Selecting and siting antennas are important considerations in your system design. The antenna choice for
the site is determined primarily by the frequency of operation and the gain required to establish reliable
links.
the site is determined primarily by the frequency of operation and the gain required to establish reliable
links.
Base or Repeater Station
The predominant antenna for a base station or a repeater station is an omni-directional collinear gain
antenna.
antenna.
Omni Directional Collinear Antennas
Factor
Explanation
Frequency
Often used in 380-530 MHz bands
Gain
Varies with size (5 dBi to 8 dBi typical)
Wind loading
Minimal
Tower aperture required
Minimal
Size
Range from 2 m to 3 m length
Polarization
Vertical