HF Log Periodic Antenna LP-1005AA ( 3.0 – 30.0 MHz )

 

 

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. 

Specifications

Military Nomenclature Part of AS-3515/GRC National Stock Number 5985-00-121-4334 Options Model T-3002FA: Heavy duty dual 80 foot tower guyed structure and a 100 foot rotating mast  Model T-3002GA: Heavy duty dual 60 foot tower guyed structure and a 80 foot rotating mast  Model T-3002SS: Heavy duty dual 80 foot tower self supporting structure and a 100 foot rotating mast  Obstruction Lighting Kit  R3503: Heavy duty ground level rotator with DRC3 digital control system  Safety Climb and Ladder

Electrical Characteristics

Frequency Range 3.0 to 30.0 MHz Power Handling Capability (PEP) 50 kW Power Handling Capability (Average) 25 kW Polarization Horizontal Cross Polarization (± down) 20 dB Forward Gain Over Average Soil Conditions at 100 ft/30.5 m 10 to 13.5 dBI Front to Back Ratio (in dB Nominal) 14 Nominal VSWR (with respect to 50 Ω) 2:1 (4 to 30 MHz)  3:1 (3 to 4 MHz) Input Impedance 50 Ω Input Connector 1-5/8″ EIA Azimuth Half Power Beam Width (Average) 70 º

Structural Characteristics

Boom Length 72 ft 21.95 m Longest Element 104.16 ft 31.75 m Turning Radius 63.5 ft 19.35 m Total Number of Elements 19 Wind Loading Capability: No Ice 120 mph 193.08 km/h Wind Loading Capability: Radial Ice 0.25″ (6.3 mm) 80 mph 128.7 km/h Net Weight 2100 lb 955 kg Shipping Weight 3650 lb 1659 kg Shipping Volume 242 ft³ 6.85 m³ Wind Surface Area 120 ft² 11.15 m²

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