HF Log Periodic Antenna – Frequency Range 3.0 – 30.0 MHz
The LP-1005 antenna array is designed for medium and long range high frequency applications. This antenna provide high reliability coupled with high efficiency while exhibiting low VSWR and high, effective radiated power. It may be mounted on a tower for fixed azimuth path applications or mounted atop a rotator where multiple azimuths can be selected. The LP-1005 is log periodic dipole array consisting of linear dipoles from 6 through 30 MHz and inductively taper-loaded dipoles from 3 to 6 MHz. This antenna is all capable of 25 kW average power, 50 kW PEP power. The design of this antenna results in arrays of minimum physical size while providing a high efficiency antenna product. Additionally, it is also designed to withstand the rigors of extreme environmental conditions.
The boom support structure is manufactured of 6061-T6 aluminum extruded members, secured with high strength stainless steel, galvanized steel and corrosion resistant hardware. The transmission line connecting the dipole elements is composed of a unique, balanced to unbalanced feed line, terminating in a standard EIA coaxial line. The coaxial portion is air dielectric with Teflon spacers, separating the center conductor and outer conductor at specified intervals. Teflon is a registered Trademark of E.I. DuPont de Nemours & Co. It is recommended that the transmission line be pressurized with dry air or SF6 for high power applications. The extreme ends of all coaxial transmission lines are terminated with a 15 PSI relief valve, allowing for automatic line purging simply by increasing line pressure to beyond 15 PSI. All radiating elements are structurally tapered, telescoping aluminum tube sections providing minimum weight, consistent with maximum strength and minimum drag.
The longest four elements on the LP-1005 are base inductively loaded with helical copper coils, connected to their respective transmission line position and elements at stainless steel terminals. All element center insulators are composed of fiberglass for high electrical, as well as mechanical, strength.
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