5 Element Yagi Beam

A small review of the assembling of my new antenna - 5 elements Yagi Beam made by Vortex Antennas UK.


Description - (from Vortex's website)

A 5 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. We use two PVC spacers which keep the driven element and the first director at a constant optimum spacing even during windy conditions thus preventing impedance swings. 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 with the following key changes. The buyer wanted good performance, good front to back, a really lightweight system that a small rotator could handle and good bandwidth over a shorter than standard boomlength. Following some optimisation of current Vortex OWA systems, we came up with a design that fitted the bill in all areas.

Band: 11m (26.3-27.9mhz)
Element Material:    6082T6 or *AA6082T6 Aluminium Tube (VORTEX)
Boom Material:    30mm x 30mm x 2mm 6082-T6 box section aluminium
Boom Length:    5.65m
Gain:    9.36dBi Typical
Front to Back Ratio:    >20db
Matching:    None – Direct Connection
Feed:    Via SO239 Socket
Hardware:    All stainless steel hardware and clamps included except boom to mast mount (Optional)
Element Clamps:    Standard Duty Polyamide
Antenna Weight:    9.9kg
Element Brackets:    Genuine ‘VORTEX’ 6082-T6 Aluminium Plates
Longest Element Length:    5.58 meters
Power Rating:    5kw

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