InnovAntennas XR7C - 14 elements 7 band beam
InnovAntennas XR7C - 14 elements 7 band beam
The XR7C antenna
The XR7C is a 7-band shortwave Yagi with 14 elements. The antenna works on the bands 20, 17, 15, 12, 10, 6 and 4m! This makes it perfectly suitable for current transceivers with these bands. The average gain of the XR7C is 11.24 dBi when mounted 20m above ground. The max. permissible wind speed of 172 km/h shows that this antenna is also suitable for very demanding locations, for example on the coast. The materials also speak for this: UV-resistant insulators, seawater-proof stainless steel elements and aluminium from aircraft construction. The boom is only 3.6m long, the maximum element length is 8.8m, the turning radius 5.99m. The XR7C is the beam for all DX-ers who want to use the traditional bands perfectly, but also want to experience the magic of the 6 and 4m bands.
For situations with limited space, this antenna also exists as XR7CC with shortened elements.
The XR Beams from Innov Antennas
The XR beams from Innov Antennas (UK) are full-size beams with excellent data that are very popular internationally. These antennas have been calculated by G0KSC over a long period of time and have been optimised again and again to achieve the best possible balance between size and performance for a multi-band Yagi. In doing so, equal attention was paid to a very solid construction and a sufficiently small packing size. This also keeps transport costs within reasonable limits.
The most important features of the XR beams from Innov Antennas:
* No traps, no matching links, no hairpins.
* Only one feed line for all bands
* Careful selection of materials without regard to cost
* Very robust construction with still manageable pack size
The XR series beams use a 50x50mm square boom 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.
With the larger multi-band Yagis, care has been taken to ensure that there are never more than the elements of 3 bands nested within each other. This is because each additional element on one band can cause 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.
Due to the robust construction and the absence of moving or electrically active components such as coils, traps, hairpins, etc., an Innov Antennas XR beam is maintenance-free for many years. The insulators are UV-resistant and designed for a wide temperature range. The mounting hardware uses sea-water resistant stainless steel, the aluminium is type T6 6066/6082, which is also used in aviation. It's nice not to have to climb the mast every year to maintain the antenna...
The XR multiband beams are designed to require only one feed line. This makes installation on a mast with a rotor very easy. And the use of modern SDR transceivers, which allow the observation of several bands at the same time, becomes really useful. The one feed line is connected directly to the solid distribution rails of the fed elements. By avoiding baluns, matching elements, traps or hairpins for tuning, there is practically no limit to the transmit power - except for the coaxial cable. 10 kW and more is usually no problem.
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|
|Balun Included||No, not required|
|Number of connectors||1|
|Antenna mount||Center Mount|
|Antenna Type||Directional Antenna|
|Design of antenna||Yagi|
|Rotation Radius (m)||4.84|
|Weight [kg]||32.00 kgs|