RFS RADIO FREQUENCY SYSTEMS ST SERIES

GENERAL DESCRIPTION

SLOPING TRIANGLE ANTENNAS - ST SERIES

photo RFS Radio Frequency Systems ST Series

These simple low cost broadband horizontally polarized antennas are designed for medium to long range transmission or receiving applications.

Characterised by an increase in gain and directivity when operated within the higher frequency band, the ST series provides an economical option to a full horizontal Log Periodic Dipole design.

The antenna comprises two sloping wires resistively terminated at the centre point of the vee near ground level. The apex of the vee is supported by a suitable mast whilst the antenna is fed via a balun transformer at the mast head.

The ST series is available with or without mast systems of which two versions are available:

Tubular aluminium (MA)
Triangular galvanized steel (for high wind loading) (MS)

TECHNICAL SPECIFICATIONS
MODEL			ST330	ST530
Electrical
Frequency Range		(MHz)	3 - 30	5 - 30
Polarization			Horizontal
Power Rating-Average			Optional to 1 kW
VSWR			Typically less than 2:1, Max. 2.5:1
Radiation Pattern			Directional
Connector			"N" Socket
Mechanical
Mast Height		(m)	19	15.5
Mast Guy Radius		(m)	14	11
Ground Dimensions	Vee Length	(m)	100	80
	Vee Width	(m)	80	63
Wind Rating	aluminium (MA)	(km/hr)	160	160
	steel (MS)	(km/hr)	230	230
Specifications may change without notice

AZIMUTH RADIATION PATTERNS

ELEVATION RADIATION PATTERNS

GAIN
ST330	ST530

ANTENNA PICTURE

picture RFS Radio Frequency Systems ST Series

ORDERING INFORMATION
Example	Model		Power/Impedance		Wind Rating		Mast Requirements
ST330*110	ST330	*	1		1		0

			1	50 W Av./50 ohm	1	160 km/h	0	None
			2	250 W Av./50 ohm	2	230 km/h	1	Mast and Stub Mast kit (MA)
			3	1 kW Av./50 ohm			2	Mast and Stub Mast kit (MS)
							3	Mast, Stub Mast and Jury mast kit (MA)