Balun amateur radio hf

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

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

A balun is a MUST for dipoles or similar antennas once they are give with concentric cables. many a hams connect the center conductor of the coaxial transmission line to one region of the dipole, and the conceal to the other. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the factual shield, this is, ground) and the external shield, who is really far to be ground. In this way, your antenna has 3 arms, the two from the dipole and the coaxial conductor shield (external face). Use a primary solid solution bar from a AM receiver or better, a toroid.

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

Its really an resistivity transformer (9:1) to feed a higher impedance, end fed (unbalanced) random wire which is apt to be a few hundred ohms, and change it into something closer to a 50Ω (unbalanced) homocentric input, hence Un Un. It can withal also be put-upon as a balun by not fastening the other than playing period of the balanced output. The round shape 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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