Folded Dipole Shortwave Antenna (ASW)

Low Power Shortwave Antenna

Page 2 of 4

Shortwave (SW) Broadcast Antennas

Shortwave broadcasting is a highly cost-effective way of providing large area domestic service with transmitting powers from 1.5 kW of up to 500 kW. The broadcast footprint reaches out several hundred kilometres from the transmitter, and is intended for widespread use. Unlike satellite broadcasting, mobile reception is easily achieved. Receivers are widely available all over the world and are commonly used by a large number of listeners who are unable to receive information via satellite or internet. Ampegon offers a full range of shortwave equipment up to 500 kW, including:

• Directional and omni-directional antenna systems • Supporting masts and towers • RF-feed-lines • Accessories like RF-switches, high performance insulators, control systems,

air obstruction lights, safety devices etc.

Ideally the entire shortwave transmission system is precisely optimized to the broadcaster’s needs. Our engineers consider all factors which affect the performance of the system, its interaction with other nearby systems, with the environment and, lastly but significantly, the economic situation. The antenna system is the key component in this optimization process. The customer can choose from a wide variety of the Ampegon antenna system designs to perfectly match their requirements. New Design for Single Band Folded Dipole 50 kW Antenna System

A new antenna design concept and an optimized antenna structure is used for the introduction of this antenna type. The folded dipole antenna is available in the RF power range up to 50 kW and developed for economic and efficient domestic shortwave transmission. The antenna system is designed with proven and reliable Ampegon components and optimized to low power specifications, which results in significant simplification without any loss of performance.

The antenna system has outstanding key performance indicators.

• VSWR ≤ 1.5 in the operational frequency band (Z0 = 300 ) • Gain 8 dBi

300 Ω RF Feed Line

Folded Dipole

Page 3 of 4

Key Features

Highly cost efficient design Optimized performance in specified frequency band All WARC frequency bands available Rugged design Omni-directional radiation pattern Full DRM compatibility 300 balanced antenna input Low maintenance High efficiency

Principal Characteristics

• Tubular structures for suspension of the dipole

• No on-site welding necessary

• Low resistance interconnections between members, bracings, gussets etc.

• Designed for a wind speed of 160 km/h (survival) according to American Standard EIA-222-F

• Glass fibre reinforced guy ropes for minimal interference with antenna radiation

• Folded dipole antenna layout

Page 4 of 4

Materials Structure Tubular galvanized steel pylon

Guy ropes Glass fibre reinforced rod

Dipole Copper Strand

Insulators Low loss ceramic insulators

Anchor material Hot dip galvanised steel

Note: The interconnection between galvanised steel and copper is made by thimbles of stainless steel to prevent electrolytic corrosion.

Values are subject to final design

Radiation Patterns

Vertical Radiation Pattern Horizontal Radiation Pattern

Ampegon AG Spinnereistrasse 5 | CH-5300 Turgi, Switzerland Tel. +41 58 710 44 00 | Fax +41 58 710 44 01 info@ampegon.com | ampegon.com