BARRETT 2030 HF SSB TRANSCEIVER
913 Series Helical Dipoles
- Barrett P/N’s BC91301 to BC91305
913 series helical dipole antennas are compact and easily installed, having
extremely narrow bandwidth characteristics and a performance approaching that of
a wire dipole when used at frequencies over 4.5 MHz. The helical dipole antenna is
fed by a single coaxial feeder and can accommodate up to 5 frequencies.
The 913 helical dipole requires a 50mm diameter mounting pole. This pole should
be long enough to place the helical dipole at least 5 metres above any obstruction.
Alternatively the helical dipole can be mounted on top of a mast or tower. Make
sure that the site selected for the antenna is as far from any source of electrical
interference as possible and that under no circumstances it can come in contact
with high tension power lines.
After mounting the helical dipole hub on the mounting pole, remove the front
circular cover, pass the coaxial cable through the hole at the bottom of the hub.
Screw the UHF connector into the balun. Now screw the helical dipole elements
onto the hub. Each element has its frequency marked on the brass ferrule used to
screw the element onto the hub. Assemble the helical dipole elements in the
positions on the hub as indicated by the diagram enclosed in the hub. Failure to
assemble the helical dipole as indicated in this diagram will cause tuning problems.
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