Balun amateur radio hf

Heres a neat 1:1 50 ohm balun for use on HF horizontal wire dipoles. It uses an AM radio ferrite rod, with 3×14 turns of wire. For 20 metres, I started with 6 metres of wire per element, and trimmed each down until it has lowest S.

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EA4EOZ, an amateur radio electronic enthusiast: Build your own HF balun

A balun is a mustiness for dipoles or similar antennas when they are provender with homocentric cables. Many hams connect the center musician of the coaxial rope to one side of the dipole, and the harbour to the other. From the RF level of view, the protection can be modeled as two conductors, the inner shield (the actual shield, this is, ground) and the outer shield, who is actually far to be ground. In this way, your dipole has 3 arms, the two from the couple and the coaxial cable shield (external face). Use a ferrite bar from a AM footballer or better, a toroid.

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9:1 Magnetic Longwire Balun / Unun – M0UKD – Amateur Radio Blog

Its rattling an impedance electrical device (9:1) to give a high impedance, end fed (unbalanced) stochastic wire which is likely to be a few hundred ohms, and modify it into something closer to a 50Ω (unbalanced) homocentric input, thus Un Un. It can however likewise be used as a balun by not grounding the new half of the balanced output. The torus is a T130-2 Iron Powder core, with 3 x 9 turns of 18SWG enammeled pig wire, and the connections can be seen below.

1:1 Voltage Balun for HF wire dipoles – M0UKD – Amateur Radio Blog

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