5 Element OWA Yagi (Optimised Wideband Antenna) Heavy Duty – 11m



5 Element OWA Yagi (Optimised Wideband Antenna) Heavy Duty - 11m

A 5 Element Heavy Duty OWA - 'Optimised Wideband Antenna' Yagi for 11m

£630.00 — £665.00

Product Code – 11M5TORHEAVYOWA

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. 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 the whole 11m band from 26Mhz to 28Mhz 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 2 to 1 bandwidth was actually 25.990 to 28.900 Mhz and we actually found the front to back ratio was nearer 30db in places, shutting off the rear QRM. 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.

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).

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.

Here’s what one user says about this antenna:
“Gave it a bash today for a few hours for the first time. When the Skypper was still up I can see there is a 4-5 S point difference and I’m only using 100w. I have been using approx 800w on the Skypper ( 20ft off the ground ) so there is a big difference as expected. I’m hearing a lot more stations much clearer. The F/B ratio is definitely very impressive.” 73 – Andy 101AT170

See info below for mechanical and electrical details

  5 Element OWA Yagi Antenna (Heavy Duty) – 11m

Band(s):  11m (26 and 27Mhz)
Element Material:  6082-T6/*AA6082-T6
Boom Material:  6082-T6 box section aluminium
Boom Length:  6.30m
Gain:   9.70dbi typical
Front to Back Ratio:   Better than 15db over 75% of bandwidth
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:   23kg
Longest Element Length:   5.66m
Hardware:   304/316 stainless steel

*If available