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

12



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

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