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Verticale per 80 metri
Verticale in vetroresina per gli 80 metri, per un'altezza totale di 13.7 metri
post 13 May 2024
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Verticale per 80m
La struttura portante è realizzata con tubi in fibra di vetro ma la radiazione proviene da un filo fissato al tubo
Vertical resonant around 3.5 MHz
The combination of wire is resonant around 3.5 MHz. With a 30 uH inductor, the resonance becomes about 1.83 MHz. A series 68-ohm resistor and 16 25 foot radials brings the feed point impedance
Verticale ad un quarto d'onda accorciata
la costruzione di una verticale monobanda, facile da realizzare, per la gamma dei 75/80 m
Shunt-Feeding a Short Tower on 80 and 160m
The shunt design has been through several iterations at my QTH. First was a single wire that was matched for 80m using an omega match
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La struttura portante è realizzata con tubi in fibra di vetro ma la radiazione proviene da un filo fissato al tubo
The combination of wire is resonant around 3.5 MHz. With a 30 uH inductor, the resonance becomes about 1.83 MHz. A series 68-ohm resistor and 16 25 foot radials brings the feed point impedance
la costruzione di una verticale monobanda, facile da realizzare, per la gamma dei 75/80 m
The shunt design has been through several iterations at my QTH. First was a single wire that was matched for 80m using an omega match
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
Atu balanced feeder antenna system An ATU has the advantage of bringing the feeder-antenna system to resonance, act as a band pass filter both on receive and transmit and a low SWR