Building a Lindenblad Antenna for 137MHz
I have built my last couple of Lindenblads from lengths of 4mm diameter galvanised steel fencing wire, some standard 300 ohm television ribbon cable, and a few bits of wood and plastic. Another useful feature of a Lindenblad is that its 75 ohm impedance nicely matches into standard 75-ohm TV coaxial cable
post 28 Dec 2021
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Antenne for satellie meteosat sheme
Since the impedance on the power point is not adapted to that of the coaxial, it is necessary to insert an impedance transformer consisting of a piece of 75 ohm coaxial cable of a quarter of a wavelength
Antenna collineare cavo coassiale RG.213
Il guadagno dichiarato da Nuova Elettronica e' di 6dB, senza specificare se dBi o dBd; l'antenna consta di tre mezze lunghezze d'onda, messe in fase con lo scambio che, da uno spezzone all'altro, avviene tra filo coassiale e calza irradiante
Antenne verticale Topfkreis
La costruzione è del tutto simile a quella descritta per la Sperrtopf, con l'unica variante del fissaggio del bocchettone
12
Since the impedance on the power point is not adapted to that of the coaxial, it is necessary to insert an impedance transformer consisting of a piece of 75 ohm coaxial cable of a quarter of a wavelength
Il guadagno dichiarato da Nuova Elettronica e' di 6dB, senza specificare se dBi o dBd; l'antenna consta di tre mezze lunghezze d'onda, messe in fase con lo scambio che, da uno spezzone all'altro, avviene tra filo coassiale e calza irradiante
La costruzione è del tutto simile a quella descritta per la Sperrtopf, con l'unica variante del fissaggio del bocchettone
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