6 Element OWA Yagi (Optimised Wideband Antenna) Heavy Duty ‘Tornado DX’ – 11m

6 Element OWA Yagi (Optimised Wideband Antenna) Heavy Duty 'Tornado DX' - 11m

A 6 Element Heavy Duty OWA - 'Optimised Wideband Antenna' Yagi for the 11m band

£900.00 — £935.00

Product Code – 11M6TORHEAVYOWA_DX

A 6 element Yagi Antenna based on the ‘OWA’ Optimised Wideband Antenna design. For a number of years experimenters and designers (and in particular the wise words from W4RNL) have re-modelled a Yagi which give a very flat response over its operating bandwidth. The OWA design requires one additional director element to achieve the 50 Ohm feed point impedance compared to beams with feed point impedances in the 25 Ohm range. By placing this director closer towards the driven element, a flat low SWR curve is achieved at an impedance of around 50 ohms. This design suits those wishing a large operating bandwidth and wider-bands such as 10, 11 and 6m are well suited to this design. This particular antenna has been designed to cover from 26.8Mhz to 28.8Mhz with good gain, an SWR of under 2 to 1 over the whole band and a front to back of over 15db for 75% of the band coverage. In testing the bandwidth usually exceeds the modelling figures and normally the array can be honed up or down in frequency to cover preferred areas of the band. Gain figures are slightly lower than a ‘conventional’ design but losses are also minimal as the system requires no matching device and can be connected directly to 50 ohm coax. We would however recommend including a 1 to 1 Current Balun at the feed point to prevent radiation of common-mode currents back down the feeder.

Large antennas such as this model also come complete with an additional ‘T-Bar’ horizontal strut/support. This support is used to reduce boom sag and anchors the boom both front and rear which reduces the sag and sideways movement of the boom. For our guying line we use ‘Mastrant’ 4mm synthetic guy line which is rated at 400kgs. To compliment the setup, S3i 316 Marine Grade Stainless Steel Eyebolts, Turnbuckles and Hardware  finish the project.

Like other antennas in the ‘Tornado’ range, this OWA is manufactured from lightweight but extremely strong construction grade 6082-T6 Aluminium stock with a heavy duty boom. The antenna includes Heavy Duty Element Brackets, Heavy Duty Polyamide Element Clamps and comes complete with M10 Stainless Steel Hardware.
Antenna is supplied with all hardware except boom to mast mount (see below).

VORTEX BOOM TO MAST PLATES
All VORTEX Antennas can be shipped WITHOUT any boom to mast mounting plates. Select this option from the drop-down menu when purchasing. Other options include the choice of mounting plates and complete mounting solutions with U-Bolts and Brackets.

See info below for mechanical and electrical details

  6 Element OWA Yagi Antenna ‘Tornado DX’ (Heavy Duty) – 11m

Band(s):  11m (26-28Mhz)
Element Material:  6082-T6/*AA6082-T6
Boom Material:  6082-T6 box section aluminium
Boom Length:  9.80m
Gain:   Typical 11.12dBi
Front to Back Ratio:   Better than 20db typical
Feed:   Coax via SO239 socket
Matching:   None – direct feed. Elements spaced for 50 ohms match
Rating:   5kw
Element Clamps:   Stauff (Germany) – heavy duty polyamide series
Antenna Weight:   44kg
Longest Element Length:   5.66m
Hardware:   304/316 stainless steel

*If available