BARRETT 2030 HF SSB TRANSCEIVER
Antenna
The antenna is a most critical part of the complete radio installation. It must accept
the output power from the transmitter, radiate that power with minimum loss and in
the receive mode, accept weak signals for input to the receiver.
Incorrect antenna installations will yield poor system performance and are often the
cause of complaints of poor transceiver performance.
A range of antennas is available from Barrett to suit most small fixed stations.
Detailed instructions are included with each antenna.
912 Single Wire Broadband Dipoles
- Barrett P/N BC91201
Barrett 912 single wire broadband dipoles are ideal for base stations that require
operation on multiple frequencies throughout the HF spectrum using a single
antenna.
The 912 antenna can be mounted either in a horizontal or inverted 'V' configuration
as illustrated in the following diagrams. In the horizontal configuration the major
radiation direction is broadside to the antenna. When mounted in the inverted 'V'
configuration the antenna becomes fairly Omni-directional. In the horizontal
configuration the minimum distance between the masts is 49 metres and the
recommended mast height is 15 metres. In the inverted 'V' configuration the
recommended mast height is 15 metres and
at this height the 2 metre stub masts are each installed at a minimum of 19 metres
from the mast base. In locations with limited space the antenna can be mounted
with the ends past the load resistors drooped down towards the ground. White
nylon supports located just past the load resistors are provided to attach halyards
for this configuration. In this configuration the minimum distance between masts is
reduced to 33 metres. Support towers may be either lattice masts as illustrated,
tubular telomasts or other support structures that may be available locally. It is
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recommended that the halyards used to support the antenna be either UV stabilised
Dacron cord or wire rope and that pulleys should be of stainless steel construction.
