ANTENNA PRODUCTS CORPORATION LPH-27

GENERAL DESCRIPTION


ROTATABLE, HORIZONTAL POLARIZATION, LOG PERIODIC, HIGH POWER - LPH-27

photo Antenna Products Corporation LPH-27 Applications

The LPH-27 is well suited for medium range sky wave circuits.

Features

The LPH-27 is a broadband, log periodic antenna which is steerable in azimuth. The array is tilted with respect to ground to provide slowly varying elevation patterns with frequency.

Characteristics

The array is mounted on top of a 50-foot selfsupporting tower. The front (higher frequency end) of the antenna is 30 feet above ground. The array is inclined at an angle of 22° with respect to the horizontal. The HF antenna array consists of the main support structure (boom) twenty tapered tubular elements, a twin feedline, and a transformer. The boom is an all-aluminum tower section laced with tubular diagonal braces and assembled with high-strength galvanized steel hardware. The twenty elements varying in length log-periodically, are all-aluminum tapered tubes. The rotator is mounted near the top of the tower with work platforms provided for easy maintenance. The input impedance of the antenna is 80 ohm. A transformer is used to match this impedance to 50 ohm. A rotary joint allows continuous rotation.

Equipment Supplied

Antenna array, mast, antenna drive, self-supporting tower, ground hardware, remote control, and erection kit (less winch).

Optional Equipment

Obstruction lights, climbing devices, and winch. Coaxial cable, connector adapters and mating adapters. Computer controller with RS-232 interface.

TECHNICAL SPECIFICATIONS
MODEL
LPH-27A LPH-27B LPH-27C
Frequency Range
4 - 30 MHz 4 - 22 MHz 4 - 30 MHz
Power
Receive 50 kW carrier
75 kW avg.
200 kW PEP		 25 kW avg.
50 kW PEP
Input Connector
1-5/8" EIA 6-1/8" EIA 3-1/8" EIA
Gain
9.5 dBi @ 4 MHz, 12 dBi @ 12 MHz
Back and Side Lobe
15 dB minimum
Input Impedance
50 ohm unbalanced
Azimuth Beam Width
Nominally 65° at half
VSWR
2:1 maximum
Wind Loading
120 mph or 80 mph with 1/4" ice
Maximum Height
73 ft
Boom Length
118 ft
Longest Element
124 ft
Tuning Radius
72 ft
Shipping Wt (lbs) 14,000
Shipping Vol (cu ft) 800
Specifications may change without notice

AZIMUTH RADIATION PATTERNS
Antenna Products Corporation LPH-27 azimuth radiation patterns


ELEVATION RADIATION PATTERNS
Antenna Products Corporation LPH-27 elevation radiation patterns