ALYX ANTENNA GUIDE HORIZONTAL DIPOLE ANTENNA FOR SHORTWAVE RADIO BROADCASTING

GENERAL DESCRIPTION

The horizontal dipole antenna is very simple to construct and an effective performer.

A center-fed half-wave dipole consists of a straight wire, one-half wavelength long and fed in the center.

A half-wave dipole is just one form a dipole can take. Actually, a center-fed dipole can be any length electrically, as long as it is configured in a symmetrical fashion with two equal-length legs.

The horizontal dipole antenna is a directional antenna.

In general, the greater the length of a center-fed antenna, in terms of wavelength, the larger the number of lobes into which the pattern splits. A feature of all such patterns is the fact that the main lobe - the one that gives the largest field strength at a given distance - always is the one that makes the smallest angle with the antenna wire. Furthermore, this angle becomes smaller as the length of the antenna is increased.

The polarization of a horizontal dipole antenna is horizontal.

TYPICAL RADIATION PATTERNS
Azimuth pattern	Elevation pattern

TYPICAL COVERAGE MAP

TECHNICAL SPECIFICATIONS
ELECTRICAL
Azimuth pattern	directional
Frequency ranges	2-30 MHz
Gain	2-4 dBi
Input impedance	variable with frequency
Polarization	horizontal
Power ratings	1 / 2.5 / 5 kW average
VSWR	2.5 : 1 or less
DIMENSIONS
Length	5-150 m (16-492 ft)
Width	-
Height	5-75 m (16-246 ft)
Specifications may change without notice

THIS TYPE OF ANTENNA IS AVAILABLE FROM
Manufacturer	Type number	Power Level
Kintronic Laboratories, Inc.	FDP Series	L	M	H
RFS Radio Frequency Systems	ADH Series	L
Thomson Broadcast & Multimedia	RDA			H

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