Horizontally Stacked L.P. Antenna 247HU-X, 247HS-X
The CD log-periodic antennas, 247HS provide a low VSWR over a very broad frequency range. In addition, this series
offers a low take-off angle independent of local ground conditions coupled with very low side lobes and the increased
directional gain contributed by a two stacked array. The virtual absence of spurious lobes excludes off-the-path
interference at receiving terminals and minimizes interfering radiation from transmitting stations. As a result, series
247HS antennas are ideal for minimum to long distance circuits where achieving reliable communications with adequate
signal-to-noise levels is essential. This antenna is designed for communication to stations at distances on the order of
from 1000 to 8000 kilometer – either a group of fixed stations or mobile stations such as ships or aircrafts. The increase
in vertical aperture decreased the H-plane beamwidth resulting in antenna gain of 15 dBi while retaining an azimuthal
beamwidth of 60°. All the CD antennas share the same high quality, exhaustively tested components and materials. All
the radiators, feedlines, and catenaries are of alumoweld, a wire composed of a high strength steel core and a highly
conductive corrosion resistant welded coating of aluminum. All the feedline and radiator tip insulators are made of high
strength glazed alumina. The CD towers are furnished with galvanized high strength steel. All the bolts and nuts are of
the same material as the tower thereby eliminating all dissimilar metal contacts. To simplify installation at the site,
antennas are largely pre-assembled before shipment.