Proposed bunk antenna operating at 10, 12, 15, 17, 20, 40 80 metres SW-band. The upper tier (In) works on 10, 15, 20, 40 and 80 metres, the lower tier (H), 12 and 17 metres (figure 1).

Semidiapazonny antenna

Input resistance (B) is 180 220 Ω (N) 45 50 Ohms. Antenna power is carried out by two coaxial cables, separately for each tier (figure 2). Transformer TR1 with a ratio of 1:4 wound on a ferrite ring with a diameter of 60 mm and height of 10 mm, a permeability of 400 to 600. Wrap at the same time the two wires with a diameter of 1.5 mm or line with a characteristic impedance of 100 Ohm - uniformly around the ring 10 turns. Can use transformers from the antenna RV-12.

The antenna you can feed one cable by installing a relay on the lower tier. Switch must braid cable and Central wire at the same time.

Author: V. A. Fursenko (UA6CA); Publication: www.cxem.net

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