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The W8JK antenna design
Invented by Dr. John D. Kraus, W8JK, in 1937, it uses two dipoles, both driven and out of phase with each other, to create a directional antenna no front to back ratio, though that works on six bands 20-17-15-12-10-6 meters and as a top loaded vertical on 40 meters
post 14 May 2024
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An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters
A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF
Antenna dipolo
Il dipolo aperto e' l'antenna piu' semplice, la piu' economica, la piu' facile da costruire
Antenne per il radioascolto
Non sono considerate antenne, nel sensostretto del termine, i pezzi di filo
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A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF
Il dipolo aperto e' l'antenna piu' semplice, la piu' economica, la piu' facile da costruire
Non sono considerate antenne, nel sensostretto del termine, i pezzi di filo
Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band
Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m
A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated