InnovAntennas XR7 - 14 elements 7 band beam
InnovAntennas XR7 - 14 elements 7 band beam
- 7 bands, 14 element, 1 cable
- No traps, no matching links, no hairpins
- Only one feed line for all bands
- Very robust construction with favourable packing size
- XR7 Antenna
- Pole clamp 50mm
- Mounting instructions (EN)
Technical description XR7
The XR7 is a 7-band shortwave Yagi with 14 elements. The antenna works on the bands 20, 17, 15, 12, 10, 6 and 4m! The average gain of the XR7 is 11.24 dBi when mounted 20m above ground. The max. permissible wind speed is 172 km/h. The boom is only 3.6m long, the maximum element length is 11.6m, the turning radius is 5.99m.
All types of InnovAntennas' XR series use only one coaxial cable for all bands. The cable is placed directly on the radiator without a balun. To protect the end of the cable, the manufacturer Innov Antennas recommends liquid rubber compound such as the "Rubbaseal" offered. The mounting hardware uses seawater-resistant stainless steel; the aluminium used is type T6 6066/6082, which is also used in aviation. The insulators are UV-resistant.
The antenna works on the principle of nested yagis on a boom. In the design, care was taken to ensure that no more than the elements of three bands are interleaved in order to minimise mutual interference. The elements of the XR7 are untruncated, i.e. no lossy traps, mechanically sensitive hairpins or other matching elements are used. Thus, the antenna achieves high efficiency and uncomplicated setup and matching. Another advantage is the high power handling of 10 kW and more, the transmission power is actually only limited by the coaxial cable.
The XR series beams use a square boom of 50x50mm with 2mm wall thickness. A square boom has the advantage that the elements cannot twist in the plane. On the other hand, it is slightly heavier than a round boom of the same stiffness. The XR yagis do not require any bracing of the boom. The longest elements are 35mm thick in the middle and taper relatively quickly to achieve a good compromise between weight and strength. This construction also helps to avoid constant vibration even in light winds.
Application description XR7
The XR7 is the ideal antenna for all radio amateurs who want to enjoy the classic shortwave bands as well as the WARC bands, but also want to get to know the "Magic Band" 6m and also 4m. The XR multiband beams are designed to require only one feed line. The one feed line is connected directly to the solid distribution rails of the fed elements. This makes installation on a mast with a rotor very easy. The XR7 is thus perfectly suited for modern SDR transceivers that allow simultaneous observation of multiple bands.
Due to the use of high-quality materials and a robust construction optimised over many years, the antenna is also suitable for use under difficult conditions - such as on the coast.
Due to this quality of construction and the absence of moving or electrically active components such as coils, traps, hairpins, etc., an InnovAntennas XR beam is maintenance-free for many years. The same features free from a sharp limitation of transmit power, in principle 10 kW and more are possible.
With the larger multi-band Yagis, care has been taken never to interleave more than the elements of 3 bands. This is because each additional element on one band can lead to interference on one band. This negative effect was avoided by careful manual optimisation. The result is the best possible matching over a wider band range than other antenna designs. In most cases, no tuner is necessary; the SWR minimum can be precisely set by adjusting the element lengths.
All models of the XR series also exist in a 'compact' version (XR3C, XR4C etc.). Here, the longest elements have been shortened to make the use of these impressive antennas possible even where space is limited. The longest elements are electrically extended by passive roof capacitors, thus reducing the turning radius quite considerably.
|Frequency Range||14 - 72 MHz|
|Boom length [cm]||360 cm|
|Max. Mast Diameter [mm]||50 mm|
|Max. Windspeed (km/h)||172 km/h|
|Impedance (Ω)||50 Ohm|
|Max. Power [W]||10000 W|
|Number of Elements||14|
|Rotation Radius (m)||5.99|
|Number of connectors||1|
|Antenna mount||Center Mount|
|Antenna Type||Directional Antenna|
|Design of antenna||Yagi|
|Balun Included||No, not required|
|Weight [kg]||33.00 kgs|