WiMo

WX-7036 UHF Crossed Yagi 2 x 18 el

WX-7036 UHF Crossed Yagi 2 x 18 el

WiMo
€199.00
incl. VAT plus shipping €167.23
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SKU: 18208.HP
In stock, shipped in 3 to 4 days.

UHF Crossed Yagi 2x 18 elements, design according to DK7ZB, max. 800W transmitting power

What is a crossed yagi?

A cross yagi consists of two normal yagi systems mounted on the same boom and rotated 90° in position.
The antenna can be arranged on the mast so that the two systems are at 45° to the ground (X setup) or at 0°/90° to the ground (+ setup). In the '+ configuration', the mast must be made of non-conductive material, otherwise it would have a strong negative influence on the diagram of the vertical antenna.



How do I feed a cross yagi?

Either both systems (both dipoles) are driven by one signal, but with different phases, this way a circular polarisation is achieved. For this purpose, the X-position of the antenna is usually chosen. Or you can switch a cable between the two systems, in which case you have two antennas in a + set-up: a horizontal and a vertical Yagi. Of course, it would also be conceivable to lay two cables to use both systems at the same time, or to switch only in the shack.

If you only want to have a fixed, non-switchable circular polarisation, cables of different lengths are sufficient, which are brought together on one cable via a 3dB coupler (splitter).

If you want maximum flexibility, you can mount a remote polarisation switch (see accessories) on the antenna. From this box, two cables go to the antenna, one coaxial and one control cable to the radio. The remote switch then offers the possibility to switch between left or right circular polarisation or between horizontal or vertical linear polarisation.


What are crossed yagis used for?

Crossyagis are mainly used for EME (Earth-Moon-Earth) connections, or for satellite connections. These are both modes that cross the ionosphere, where unpredictable polarisation rotations often occur. Circular polarisation is used to compensate for this and thus suffer less loss.

Of course, a cross yagi can also be used as a double system with a vertical and a horizontal yagi, for example, to make long-distance transmissions both via FM relay (vertical) and via SSB direct connections (horizontal).


Features of the WiMo Yagis

  • Highest possible gain
    with high bandwidth and good side lobe and return loss. Thus, the antennas are oriented towards the demands of serious VHF amateurs who need a powerful antenna for long-distance traffic and all operating modes. The design principles of the Yagis were worked out with computer programmes calibrated at NEC and verified by many test setups.
  • Current-optimised design
    Within a yagi structure, the aim is to achieve uniform element currents from the centre of the exciter to the end of the antenna that do not fall too sharply. The yagis were designed for an optimal current profile. In older designs, there are jumps in the current assignment of the elements, resulting in less than fully utilised gain and poorer side lobe and return loss.
  • Minimum number of elements
    Other Yagis of comparable length have 2-3 elements more and thus more losses. Note: Antenna gain depends first on the antenna length, not on the number of elements!
  • Broadband elements
    Only highly conductive aluminium tubes with a diameter of 8 mm are used for the elements. This represents the best compromise between minimum losses and the resulting wind load. Thin steel elements cause considerable additional ohmic losses and the skin effect, which is already very effective with VHF. Yagis with such elements give away more than 0.5 dB gain due to poor conductivity!
  • Defined element mounting
    Long-term stability with UV-resistant polyamide clips. This means that there is no change in the electrical data even after years. If the elements were fixed directly to the boom by metal clips, oxidation could gradually change the effective element lengths and thus the antenna data over time!
  • Encapsulated dipole baluns
    The dipoles are real folded dipoles with Teflon baluns in the dipole box. So no forced matching with the well-known cladding wave problems! The 2m antennas are also connected via an N-socket. The dipole boxes are absolutely weatherproof, cold-welded and additionally foamed. The Teflon balun is completely inside the dipole boxes. There is no balun loop that protrudes from the junction boxes into the antenna and is then usually attached to the antenna more or less well with adhesive tape! As a result, there are also no leakage problems at the twice-passage of the balun loop through the dipole box.
  • Robust construction
    Except for the mast clamp itself, only screws, nuts and washers made of stainless steel (V2A) are used to ensure a long service life of the antennas. The element holders are made of UV-resistant polyamide, in the case of the cross yagis with round tube boom they are made of aluminium.
  • German manual
    The manual contains all the technical data and also information on staking and interconnecting several identical antennas.
Technical Data
Height [m] 34 m
Front/Back Ratio 432 MHz (dB) > 20
Gain 432 MHz [dBi] 16.1
Supported Bands 70cm
Mono-/Multiband Monoband
Half Power Beam Width (3dB) Vertical 30
Half Power Beam Width (3dB) Horizontal 28
Number of connectors 2
Product Name WX-7036
Boom length [cm] 340 cm
Balun Included Yes
Max. Power [W] 800 W
Frequency Range 430-440 MHz
Polarisation Circular or Linear
Antenna Guying No
Antenna Type Directional Antenna
Design of antenna Crossed Yagi
Strut no
Antenna mount Center Mount
Max. Mast Diameter [mm] 65 mm
Documentation Languages DE
EN
Weight [kg] 3.10 kgs

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