Antenna HB9RU for the 50 MHz band and more. Scheme, description

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Antenna HB9RU for the 50 MHz band and more. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / VHF antennas

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The analysis of the connections made during the year of work on 6 meters allowed me to draw some conclusions, which I want to share with fans of the "magic range". Working from a KN89CW square to a YAESY FT-736RDX transceiver with an output power of 10 W, I tried many antennas, both with vertical and horizontal polarization. 70% of contacts were made through "sporadic" Her; 5% of the bonds are carried out by Te and reflection from the Fz layer; 15% of contacts were carried out by "Tropo" and 10% - it's hard to say for sure, but, most likely, variations of Es and Te or Her and Fz were probably manifested. The bulk of the connections are made through Her and Fz. Kharkiv is located in the middle latitudes and, of course, Her cloud does not hang overhead - there is practically no near zone. But the most interesting connections were made when the cloud was no closer than Italy. That is, at angles of approximately 8-10 degrees to the D-130 antenna (Discon by Diamont). At the same time, the stations were almost barely audible to the horizontal dipole.

According to the received QSL cards, I saw that my correspondents (TOP-30 according to the DUBUS magazine) use, as a rule, 5-6 el.Yagi or in rare cases 2x7 el. It became clear that reflections from Her cause a change of polarization. But unfortunately Yagi with a traverse length of 1 ... 1,5l (6 ... 9 meters) has an angle in the vertical plane of 28-33 degrees, which is clearly not effective for working on tracks over 2500 km. It turns out that out of 10 W, 7 W is radiated into space. The real way out of the experience on VHF, the length of the traverse 5l or 2x5l on the 50 MHz band does not work, as it turns out something about 30 meters. But unfortunately, it is not effective to have a narrow diagram in the horizontal plane, since during the "sporadic" the antenna does not spin. The situation is slightly facilitated by the fact that in Russia there is still no 50 MHz band, and if you have a diagram in the horizontal plane of 120-150 degrees and in the vertical plane up to 10 degrees, then the antenna can not be twisted at all. What can meet these requirements? A few, for example, 2-element phase verticals and ZL-beam, W8JK-beam and HB9CV with vertical polarization.

The studies by V. Polyakov (RA3AAE), cited in the HF magazine, with the HB9CV antenna, in general, have been known for a long time. Back in 1976, in the Swiss magazine "Old Man", and then in "Funkamator'e" No. 10-82, the HB9RU antenna was published on the VHF / UHF bands. Initially, I did not like the HB9RU antenna in the 80s because of its operation only with veotic polarization (there were no repeaters and low-level FM communications at that time), but I reasonably decided that 6 dB is not lying on the road. This is still a 4-fold increase in power. Due to its small size, I took it to a dacha in the Crimea and on the FT-11 transceiver, I almost daily opened all the repeaters from Novorossiysk to Trabzon (Turkey). Having recalculated the antenna for the 50 MHz range, I realized that this is what you need. Traverse material - duralumin with a diameter of 30 mm. The elements are made of D-16T with a diameter of 10 ... 12 mm.

Antenna HB9RU for the 50 MHz band and more
Ris.1

Adjustment of the antenna to resonance at 50,150 kHz is achieved by a M6x35 brass screw, which is located at the top of the middle element. With the dimensions indicated in the drawing, the antenna on all ranges is tuned without problems. The presence of the reflector increased the gain of the antenna by about 1 dB, but at the same time the influence of the mast, which is located behind the reflector, was reduced. Therefore, the antenna, installed on the mast, can not be adjusted. A little later, I found a use for this antenna on the 144 and 430 MHz bands, using them for communication via satellites: Fo-28. Fo-20. Uosat-14, Sunsat-35, Ao-27. Antenna parameters declared by HB9RU itself, such as Kus = 5 ... 7 dB and forward / backward ratio -15 dB, were fully confirmed. SWR in the ranges when setting up easily turns out to be 1,1. Gamma matching is set up very simply, because, despite the half, the antenna under the traverse "sees" its mirror image. Thanks to this, I got the opportunity not to clutter up the roof, but to install an antenna on the balcony and even block the sector from Australia to Finland, i.e. 170 degrees. The schematic drawing of the HB9RU antenna is shown in Fig. 1, and the dimensions for the three bands 50, 144 and 430 MHz are summarized in Table 1.

	50 MHz	144 MHz	430 MHz
А	1146	380	126
Б	1590	520	170
В	1839	610	203
Г	405	135	45
Д	135	45	15
Е	510,6	170	56,6
Ж	862	287	95,6

A 30 mm aluminum pipe or an aluminum profile can be used for the traverse. Linear dimensions A - F are given in millimeters.

The 50 MHz antenna is assembled on a separate traverse, and the 144 and 430 MHz bands are placed vertically one under the other, Fig. 2.

Antenna HB9RU for the 50 MHz band and more
Ris.2

The power supply PL connectors are located horizontally, and the power cables can be stowed away in the traverse. The antenna turned out to be so compact that communications via satellites can be carried out by holding it in the hand. It may not be convenient, but communication with the FT-100 transceiver from the car via UoSat-14 and SunSat-35 was a pleasure. I will be very happy if my article helps you discover the magical 50 MHz band.

Author: A. Karakaptan, UY5ON Kharkov; Publication: N. Bolshakov, rf.atnn.ru

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