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Curtain arrays were originally developed during the 1920s and 1930s when there was a lot of experimentation with long distance shortwave broadcasting. The underlying concept was to achieve improvements in gain and/or directionality over the simple dipole antenna, possibly by folding one or more dipoles into a smaller physical space, or to arrange multiple dipoles such that their radiation ...
There are several designs for curtain arrays, among them Sterba curtains, bobtail curtains, and HRS antennas; the half-square antenna is a minimal curtain array, with only two radiating elements and no reflecting screen.
In addition to the curtain-antennas primarily existed five log-periodic antennas with horizontal polarization, consisting in two radiators with 26 dipoles each, built up side by side. The main beam could be tilt to +/- 20 degrees by pivoting (or slewing) switches. They were furnished by Telefunken.
Before the HRS antenna became the default design for high power broadcasting in the 1950s, Sterba curtains were used to transmit shortwave broadcasts. Sterba curtains are modest-gain single-band curtain array antennas. They are named after Ernest J. Sterba, who developed a simple shortwave curtain array for Bell Labs in the 1930s. [1]
An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. [ 1 ] : p.149 [ 2 ] The individual antennas (called elements ) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase ...
Due to changing technologies, transmissions shifted to satellites. The station was closed November 14, 1994, and the antenna towers brought down over the winter of 1997-1998. Through the Federal Lands to Parks Program, the site was divided into several uses. West Chester Township acquired Bethany Station and 22 acres for historic preservation.
The CCIR designation for this type of antenna (below) is HR 4/4/0.5. Blasted on 2 April 2011. Blasted on 2 April 2011. The Hörby transmitter ( Hörbymasten in Swedish ) is a transmission mast located in Östra Sallerup , near Hörby in the southmost part of Sweden operated by national broadcaster Sveriges Radio .
The antenna array is composed of three concentric rings of antenna elements. Each ring of elements receives RF signals for an assigned portion of the 1.5 to 30-MHz radio spectrum. The outer ring normally covers the 2 to 6-MHz range (band A), but also provides reduced coverage down to 1.5 MHz.