Vertical loop antenna (LOOP). Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Vertical loop antenna (LOOP). Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / HF antennas

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According to my observations, the Windom antenna is rarely used by amateurs. However, due to the lack of notch filters and the possibility of single-ended supply, it has some advantages in multi-range mode. Plus, it's pretty easy to install. And only for work in the range of 160 m it turns out to be too short. This note suggests a possible way out.

If, for example, we want to use the FD-4 (as the best known of this type of antenna) on 160m, then the lengths of both arms are doubled, the antenna becomes too long. The only way out is to fold the elongated radiators so that a vertical loop antenna forms on its own. True, for 160 m this loop should remain open.

Thus, we got a closed vertical loop for all classic amateur bands.

As can be judged from the results of many experiments, the shape of the area covered by the antenna does not really matter. Tuning is no problem, however for 80m you need to add a capacitor which is not needed on the higher bands. With this capacitor, you can shift the resonance by 80 m to where you need it. The 160 pF capacitor turned out to be the best. I made it from foil fiberglass 1,5 mm thick, the area was 16x260 mm. The capacitor can withstand 750W of power. To work on 160 m, it must be short-circuited, and to open the loop, attach an additional tuning wire to the working contact of the relay, which can be hung in a zigzag pattern at a low height.

(click to enlarge)

The top wire must hang at a height of about 13m, otherwise it will be difficult to place additional wires at the bottom. At the same time, the lower wire hangs above the ground at a height of about 3 m, with the exception of the range of 3,5 ... 3,55 MHz, where the SWR was obtained at about 2,5, in all other ranges it was within 1,1 ... 2. Naturally, at higher ranges, the antenna turns out to be much more broadband.

Author: H.SARRASCH (DJ7RC). Translation by A. Belsky; Publication: N. Bolshakov, rf.atnn.ru

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