ALYX ANTENNA GUIDE
FIXED HORIZONTAL LOG-PERIODIC ANTENNA FOR SHORTWAVE RADIO BROADCASTING


GENERAL DESCRIPTION


photo horizontal log-periodic antenna The horizontally polarized log-periodic antenna is a broadband and directional antenna with high gain, designed for short, medium and long range communications.

They are available in a range of lower frequency limits, take-off angles and gains.

The radiation pattern is generally consistent over the entire frequency range of the antenna, however the pattern can be tailored to suit requirements.

Side lobes are consistently low over the entire operating range of these antennas, providing good discrimination against interfering signals.

The radiating structure consists of a series of broadband dipoles. The dipoles are fed along the center of the structure.

A ground mat is not required, since the effect of ground conductivity on the antenna performance is relatively small.

The horizontal log-periodic antenna is designed for direct connection to a 300 ohm balanced open wire feeder or a 50 ohm coaxial line with a balun transformer.

The supporting structure of the antenna can either be a single central tower or two towers with the antenna suspended inbetween.

TYPICAL RADIATION PATTERNS
Azimuth pattern Elevation pattern
typical azimuth pattern horizontal log-periodic antenna typical elevation pattern horizontal log-periodic antenna


TYPICAL COVERAGE MAP
typical coverage map horizontal log-periodic antenna


TECHNICAL SPECIFICATIONS
ELECTRICAL
Azimuth pattern directional
Frequency ranges 2-30 / 4-30 / 6-30 MHz
Gain 10-22 dBi
Input impedance 50 ohm unbalanced or 300 ohm balanced
Polarization horizontal
Power ratings 1 / 10 / 25 / 50 / 100 / 250 / 500 kW average
VSWR 2.5 : 1 or less
DIMENSIONS
Length 43-200 m (140-656 ft)
Width 43-320 m (140-1050 ft)
Height 15-98 m (50-322 ft)
Specifications may change without notice

THIS TYPE OF ANTENNA IS AVAILABLE FROM
Manufacturer Type number Power Level
ASC Signal 747CD L M
747FCD L M
748
M
2701/2702 L M
Antenna Products Corporation LPH-0300 L M
LPH-0400 L M
LPH-0500 L M
LPH-0606

H
LPH-0612

H
RFS Radio Frequency Systems HLP Series L M
HLS Series L M
TCI Model 501 L M
Model 515/516
M H
Model 524 L M
Model 527 L M H
Model 527B L M
Model 528

H
Model 530 L M
Model 532 L M
Transradio SenderSysteme Berlin AHL 0447

H


ABBREVIATIONS

Abbreviation Explanation
Power Level L low 1-5 kW
M medium 10-50 kW
H high 100-500 kW