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20-Meter JPole Vertical


JPole antenna is for the top section to be 1/2 wave radiator with a 1/4 wave matching section for the feed. The bottom of the feed section is actually a shorted 1/4 wave autotransformer
post 18 Mar 2024
20-Meter JPole Vertical

Antenna Vertical Links

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Antenne verticale ground plane a radians inclines
The radiating element is a vertical quarter wave surmounting an artificial ground plane consisting of four radians of length lambda / 4 inclined

Antenne verticale raccourcie 40-80mt
The radiant part of the antenna consists of a telescopic shaft with tie rods. The capacitive cap is not finished and the resonance is still at high bit

Antenne verticale raccourcie pour le 14 et 28 MHz
Antennas of this type, to have a high efficiency, all needed an excellent grounding or a counter weight in the form of radians

Antenna verticale per hf non accordata
Elettricamente si tratta di una 5/8 per la gamma CB, dunque e' utilizzabile cosi' com'e sia in 27 sia in 10 metri, accorciandola leggermente


Linear-loaded-short-dipole-21mhz

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

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

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