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This article is not a reprint of the QST manuscript. Corrections and additional information not present in the original article are here. How do you go about achieving good DX performance on all HF amateur bands from 10 to 30 MHz without using separate antennas for each band? One alternative that occurred to me was the log periodic LP antenna.
With portable antennas, durability is a very important quality to me. The Elk has seen hundreds of deployments all while still maintaining its rigidity along the boom and its elements. Not cheap — but IMO completely worth it.
A log-periodic antenna LPalso known as a log-periodic array or log-periodic aerialis a multi-element, directional antenna designed to operate over a wide band of frequencies. The most common form of log-periodic antenna is the log-periodic dipole array or LPDAThe LPDA consists of a number of half-wave dipole driven elements of gradually increasing length, each consisting of a pair of metal rods. The dipoles are mounted close together in a line, connected in parallel to the feedline with alternating phase.
Brython code is not intended for running stand alone, even though it looks almost identical to Python. Carrel R. The design of log-periodic dipole antennas.
Boom Length, Type N, Female. Designed for horizontal polarization, they may also be mounted vertically with user-supplied hardware. These antennas are capable of transmitting on all amateur bands from 6-meters through centimeters at watts power! Forward gain for these antennas from 50 to 1, MHz is 10 to 12 dBi, depending on the frequency.
From this work, we have developed our own extensive and proprietary LPDA antenna design program. It was a snap to assemble and install. Hugo big hurricane didn't touch it.
I worked as an independent consultant for two companies that manufactured heavy duty multiple channel antennas for commercial installations. In these installations, pattern and SWR was everything. Because the antennas were used to feed video to thousands of customers, and often installed hundreds of feet above ground, the antennas needed clean tight patterns without ghosts caused by standing waves. I actually became involved because some commercial antennas had ghosting and pattern problems.