Hits
Antenna EFHW 20m-15m-10m
Attualmente utilizzo come antenna un semplice filo di 10 metri impiegando come contrappeso un filo di 5 metri buttato per terra
post 15 Feb 2024
Antenna End Fed Links →
End fed-Halfe-wave antenna
This type of antenna has same performance as a dipole, but requires only one single mounting point, which makes this concept ideal for portabel stations. Actual bandwith is more than 2 Mhz with VSWR better than 1:1,7
End fed half wave antenna EFHWA
Un solo filo,tagliato alla 1\2 onda della frequenza desiderata,alimentato ad un'estremita'
End-Fed Monobanda
E' consigliato l'uso dei toroidi in polvere di ferro anziche' in ferrite, almeno fino a circa 200-300 watts
End Fed Half Wave Antenna Coupler
A dipole can be fed anywhere along its length. A centre feed gives around 70 ohm. A Windom type off centre fed dipole fed 38% along its length provides around a 200 ohm feed. The feed impedance at the very end of a half wave is thousands of ohms, usually somewhere between 2000 ohm to 5000 ohm
End-Fed Wire Antenna
Ho costruito questa simpatica antenna dopo aver trovato un piccolo toroide cheassomiglia parecchio al T80
64
This type of antenna has same performance as a dipole, but requires only one single mounting point, which makes this concept ideal for portabel stations. Actual bandwith is more than 2 Mhz with VSWR better than 1:1,7
Un solo filo,tagliato alla 1\2 onda della frequenza desiderata,alimentato ad un'estremita'
E' consigliato l'uso dei toroidi in polvere di ferro anziche' in ferrite, almeno fino a circa 200-300 watts
A dipole can be fed anywhere along its length. A centre feed gives around 70 ohm. A Windom type off centre fed dipole fed 38% along its length provides around a 200 ohm feed. The feed impedance at the very end of a half wave is thousands of ohms, usually somewhere between 2000 ohm to 5000 ohm
Ho costruito questa simpatica antenna dopo aver trovato un piccolo toroide cheassomiglia parecchio al T80
Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane
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
Calculo da Antena Bazooka A double bazooka antenna is a combination that has a complete coaxial wave multiplied by its velocity factor and a total end-to-end length of 1/4 wave for each side affected by another driver shortening facto