ALYX ANTENNA GUIDE BROADBAND DIPOLE ANTENNA FOR SHORTWAVE RADIO BROADCASTING

GENERAL DESCRIPTION

The broadband dipole antenna provides excellent performance for short to medium range circuits.

The antenna radiation pattern has a high take-off angle at the lower frequencies for short range communication circuits and a lower take-off angles at the higher frequencies for medium range communication circuits. At the lower operating frequencies, the azimuthal pattern is essentially omni-directional. At the higher frequencies, the azimuthal pattern approaches that of a dipole.

The broadband dipole antenna does not require tuning, thus eliminating the need for any form of antenna tuning unit with its associated losses. No terminating resistors are employed and so full power is available for radiation.

The broadband feature is ideal for multi-channel or frequency agile synthesized HF radio equipment.

The antenna comprises two horizontal conical sections, the elements of which are connected in the centre to a common feed line. The antenna is mounted between two guyed support masts.

TYPICAL RADIATION PATTERNS
Azimuth pattern	Elevation pattern

TYPICAL COVERAGE MAP

TECHNICAL SPECIFICATIONS
ELECTRICAL
Azimuth pattern	omnidirectional
Frequency ranges	2-30 / 4-30 / 6-30 MHz
Gain	5-8 dBi
Input impedance	50 ohm unbalanced
Polarization	horizontal
Power ratings	1 / 2.5 / 5 / 10 / 20 kW average
VSWR	2.5 : 1 or less
DIMENSIONS
Length	26-76 m (85-250 ft)
Width	15-46 m (50-150 ft)
Height	7-26 m (25-85 ft)
Specifications may change without notice

THIS TYPE OF ANTENNA IS AVAILABLE FROM
Manufacturer	Type number	Power Level
ASC Signal	1765	L	M
	3065	L
Antenna Products Corporation	BDP-230/430	L	M
RFS Radio Frequency Systems	BDH Series	L	M
TCI	Model 613	L	M
Transradio SenderSysteme Berlin	ADP 0526			H

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