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A restively terminated antenna designed and developed in the early 1990s by Graham Robinson [d] and John Barnes that has gained some attention for its wide 4 octave bandwidth (2–30 MHz). One antenna can cover essentially the whole shortwave band – useful for commercial and military stations with limited ground space, which can compensate ...
The Beverage antenna or "wave antenna" is a long-wire receiving antenna mainly used in the low frequency and medium frequency radio bands, invented by Harold H. Beverage in 1921. [1] It is used by amateur radio operators, shortwave listeners, longwave radio DXers and for military applications.
One must assume that only about 10% of HRS type antennas are rotatable, but compiled statistics are fragmentary. Only about 20% of rotatable HRS antennas are ALLISS, but this may be a slight overestimate. The Transmitter Documentation Project has most but not all stats on shortwave relay station antennas in use or historical.
HRS antennas of type HRS 1/2/z and 2/1/z exist, but see little practical use in shortwave broadcasting. An antenna with the designation of "H 1/2/z" is commonly referred to as a "Lazy-H" antenna. VHF and UHF repeaters for FM radio or television in the UK quite often employ a pair of horizontal dipoles (or short yagis) one above the other (i.e ...
Only electrical waves traveling toward the feedpoint are collected; waves traveling away from the feedpoint are grounded through a terminating resistor at the end of the wire opposite the feedpoint. The resistive termination makes the antenna receive in only one direction, similar to an aperture antenna but much simpler to build. In order to ...
TL;DR: As of August 21, get this Eton Elite Executive shortwave radio for $149.99 — you'll save 40%.For every unlikely apocalyptic ending you can imagine (an alien takeover, zombies, the return ...
WWV Transmitter Building (2002 or earlier) WWV's 15 MHz antenna WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado.It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, 20, and 25 MHz. [1]
The ALLISS module is a fully rotatable antenna system for high power (typically 500 kW only) shortwave radio broadcasting—it essentially is a self contained shortwave relay station. Most of the world's shortwave relay stations do not use this technology, due to its cost (15m EUR per ALLISS module: Transmitter + Antenna + Automation equipment).