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
Antenna for UHF VHF Links →
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
Antenne verticale colineaire
Two vertical radiating strands of lambda / 2 length are placed on the same line collinear.The upper half-wave element is supplied in phase by the one supporting it via a 1/4 wavelength line short-circuited at its end
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
Sperrtop is an omnidirectional vertical antenna used primarily on VHF and does not require a ground plane
Antenne verticale VHF ou UHF Slim Jim
An omnidirectional monoband vertical antenna compact of space which is similar to the antenna in J. It can be easily performed on strips ranging from 6m to 70cm
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
Two vertical radiating strands of lambda / 2 length are placed on the same line collinear.The upper half-wave element is supplied in phase by the one supporting it via a 1/4 wavelength line short-circuited at its end
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
Sperrtop is an omnidirectional vertical antenna used primarily on VHF and does not require a ground plane
An omnidirectional monoband vertical antenna compact of space which is similar to the antenna in J. It can be easily performed on strips ranging from 6m to 70cm
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