Antenna Lazy Delta (lazy delta). Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Antenna Lazy Delta (lazy delta). Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / HF antennas

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The 1985 Radio Yearbook published an antenna with a slightly strange name. It is depicted as an ordinary isosceles triangle with a perimeter of 41,4 m and, obviously, therefore, did not attract attention. As it turned out later, very in vain. I just needed a simple multi-band antenna, and I hung it at a low height - about 7 meters. The length of the supply cable RK-75 is about 56 m (half-wave repeater). The measured SWR values practically coincided with those given in the Yearbook.

Then it became possible to increase the height of the suspension to 13 meters above the ground. And in this case, the SWR value on all main amateur bands, except for the 80-meter one, did not exceed 1,4. On the eighties, its value ranged from 3 to 3,5 at the upper frequency of the range, so a simple antenna tuner is additionally used to match it. Later it was possible to measure the SWR on the WARC bands. There, the SWR value did not exceed 1,3. The drawing of the antenna is shown in the figure.

Antenna Lazy Delta (lazy delta)
Ris.1

Coil L1 is wound on an insulating frame with a diameter of 45 mm and contains 6 turns of PEV-2 wire 2 ... 2 mm thick. HF transformer T1 is wound with MGShV wire on a ferrite ring 400NN 60x30x15 mm, contains two windings of 12 turns. The size of the ferrite ring is not critical and is selected based on the input power. The power cable is connected only as shown in the figure, if it is turned on the other way around, the antenna will not work. The antenna does not require adjustment, the main thing is to accurately maintain its geometric dimensions. When operating on the 80 m range, compared to other simple antennas, it loses on transmission - the length is too small. At the reception, the difference is almost not felt. Measurements carried out by G. Bragin's HF bridge ("R-D" No. 11) showed that we are dealing with a non-resonant antenna.

The frequency response meter shows only the resonance of the power cable. It can be assumed that a fairly universal antenna (from simple ones) has turned out, it has small geometric dimensions and its SWR is practically independent of the height of the suspension.

Author: V. Gladkov, RW4HDK, Chapaevsk; Publication: N. Bolshakov, rf.atnn.ru

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