User's Manual

INSTALLATION
FIXED STATIONS
ENVOY™ TRANSCEIVER REFERENCE MANUAL 377
Related links:
Antenna supports in a fixed station on page 369
Earthing the antenna on page 378
Earthing the tuner on page 379
Standing wave ratio on page 366
Earthing the transceiver in a fixed station on page 374
Checking a battery on page 355
Installing the antenna
WARNING: The antenna should be installed by a suitably qualified technician, to
the relevant standards and approvals.
NOTE: Correct installation of the antenna provides efficient operation over the
frequency range of the transceiver. It ensures the antenna provides
maximum output power during transmission and clear reception of
weak signals.
Positioning the antenna
Position the fixed antenna:
• next to the antenna feed point
• free from obstructions such as buildings, trees and vegetation
• at right angles to the desired direction of communication
• away from any other antenna system
NOTE: The transceiver and antenna do not have to be positioned close to each
other if connected by coaxial cable. The transceiver and the feed point
of the antenna can be up to 20 m (22 yd) apart before heavier low-loss
coaxial cable, such as RG213, is necessary.
Horizontal wire antennas, including the dipole, broadband and long wire antennas,
have maximum radiation along their length. Radiation is lowest at the ends of the
antenna. Therefore, position these antennas at right angles to the desired direction of
communication.
Vertical antennas, such as the vertical whip antenna, have an omnidirectional
radiation pattern. Therefore, the direction that vertical antennas face is not important
as the radiation pattern is generally equal in all directions.