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Endfed per 17-20-30-40 metri
Una veloce multibanda E.F.W.H.A. dedicata ai piccoli quadri banda come il mio FT857D
post 16 Jun 2024
Antenna End Fed Links →
The J-Pole or Half-Wave Zepp Antenna
The Half-Wave Zepp is an end-fed half-wave antenna. That is, it is a piece of wire one-half wavelength long with the feedline connected at one end
The versatile end-fed wire
A length of one quarter wavelength ie 20 metres on the 80 metre band is commonly suggested. Though such antennas do work, an extensive ground system or counterpoise is required for best performance
End fed portable
Questa e' un'antenna filare End Fed lunga 16,2 metri e alimentata tramite un trasformatore a toroide UNUN con rapporto 9:1
End fed 6 - 40 Meter Multiband HF Antenna
End fed HF antenna The end fed feature adds portable convenience, but does present another issue.The problem with an end fed half wave antenna is that the antenna presents high impedance
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The Half-Wave Zepp is an end-fed half-wave antenna. That is, it is a piece of wire one-half wavelength long with the feedline connected at one end
A length of one quarter wavelength ie 20 metres on the 80 metre band is commonly suggested. Though such antennas do work, an extensive ground system or counterpoise is required for best performance
Questa e' un'antenna filare End Fed lunga 16,2 metri e alimentata tramite un trasformatore a toroide UNUN con rapporto 9:1
End fed HF antenna The end fed feature adds portable convenience, but does present another issue.The problem with an end fed half wave antenna is that the antenna presents high impedance
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground