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Two Helically Wound Antennas for 20M


Two Helically Wound Antennas for 20M

I had been researching antennas for restricted spaces for some time and decided to give a helically wound antenna for 20M a go

post 22 Oct 2024


Antenna Vertical Links

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Una array 40 mt verticale
Prendiamo due verticali appoggiate a terra su due isolatori e fornite di un opportuno sistema di radiali minimo 30 accuratamente stesi sul terreno

Una Ground Plane per i 40 metri
La GP full size ovvero a dimensione completa, senza cariche si puo' costruire con qualsiasi cosa

Vertical 7Mhz
The telescopic mast is composed of cylindrical aluminum pipes, with diameters of 35, 30, 26 and 22 mm

Vertical open stub antenna 40/20 meter
The antenna has enough good parameters at the 40 and 20 meter Bands. Antenna does not need any counterpoises


23cm Yagi Antenna building

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

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

Voice Recorder

Voice Recorder Gestito dall'integrato in questione ed offre la possibilità di registrare più messaggi per una durata massima di un minuto con buona fedeltà di riproduzione