Loop for remote tuning of the antenna. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Loop for remote tuning of the antenna. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Antennas. Technology

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The use of a loop saves a lot of time when setting up antennas. They can remotely adjust the length of any antenna element, continuously monitoring its parameters (SWR, radiation pattern). And, what is very important, the loop allows you to tune the antenna at its working height, which is far from always possible for a radio amateur when tuning manually. Using a loop, you can adjust the resonant length of such antennas as a dipole, a long wire, a "square". Delta Loop, etc.

Loop for remote antenna tuning

1-bar (organic glass), 2 - stationery ruler 570 mm long, 3 - guide (textolite, cut M6 thread), 4 - telephone relay contact. 5 - wire MG 1.5, 6-flexible shaft (polyethylene rod from a ballpoint pen), 7-motor (from a children's toy). 8-crocodile clip, 9-screw M4, 10-washer, 11-screw M3, 12-washer, 13-movable bar (organic glass), 14-gasket (wood), 15-nut M3. 16- plank (wood). 17-bandage (rubber). 18-gasket (metal), 19- bearing No. 23 according to GOST 8338-57

The design of the loop is shown in the figure. The electric motor 7 rotates the guide 6 through the flexible shaft 3, which moves the movable bar 13. A closing jumper (when setting up passive elements) or an antenna power cable (when setting up an active element) can be connected to the contacts 4 of the bar. The cable is attached to the antenna wire using alligator clips. The motor is reversed by changing the polarity of the supply voltage.

Rolling bearings 19 can be replaced with plain bearings without deterioration in performance, and the textolite guide can be made of a steel bar with a smaller diameter.

After adjusting the antenna element, the cable is removed and a piece of wire of the required length is soldered instead.

In order to compensate for their mutual influence during tuning of multi-element antennas, it is desirable to use a separate loop for each element. In this case, for example, to tune a widely used tri-band "double square" antenna, six such loops are required.

Author: Ing. V. Begunov (UW3HY); Publication: N. Bolshakov, rf.atnn.ru

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