20/11m (3/3 Elements) Delta Loop (Heavy Duty)



20/11m (3/3 Elements) Delta Loop (Heavy Duty)

A 3/3 Element Dual-Band Delta Loop Antenna for 11 and 20m


Product Code – 20M3-11M3-WWHEAVY

A 3/3 element Dual-Band Delta Loop for the 11 and 20m bands from our ‘Heavy Duty’ range. A popular antenna for the ham operator who still operates on 11m. Manufactured from lightweight but extremely strong construction grade 6082-T6 Aluminium stock with a heavy duty boom. This antenna features 5 sections of 6082-T6 or *AA6082-T6 tubing on the 20m vertical sections and 3 on the 11m. Mastrant 4mm synthetic guys are used to support the boom ends.

The antenna includes 6.35mm Diameter Wide Multiplate Element Brackets for the 11m elements and 10mm A2 304 Stainless Steel element brackets for the heavier 20m elements.H/Duty Polyamide Element Clamps come complete with M10 Stainless Hardware. Antenna is supplied with all hardware including a heavy duty boom to mast mount of either 48.3mm (Scaffold pole), 50mm, 63.5mm or 76.5mm (see below).

The design is a new for 2020 and originally requested by a UK ham who wanted a high performance antenna on both bands. On modelling, the plot on 11 is excellent with high gain nearing 8.5dbi and a front to back of over 26db. As an added bonus, the bandwidth is extremely wide and covers well into 10m (but with reduced front to back).

On 20 the gain is 9.4dbi, again with front to back of over 23db. The 20m SWR bandwidth is low over the whole band never going above 1.5 to 1 over a 300khz bandwidth and only going to 1.7 to 1 at the lower band edge. In all cases the antenna can be set-up to the operators’ specific requirements, whether SSB or CW or ‘Bandcenter’.

Vortex again use our very simple but effective approach in order to secure the element top wires. By using marine grade stainless steel fittings, the strain is taken off the top wires to prevent failure. Additionally for the all loops, a stainless steel supports bar is included to prevent the vertical arms of the elements from moving and thus potentially breaking the element bracket. For additional support of the 20m elements, 3mm Mastrant guys are used to prevent flexing up and down the boom.

**We can also supply bespoke 1:1 current/choke baluns at both feed-points (highly recommended) to prevent feed-line radiation – contact us for details **

See info below for mechanical and electrical details

  20/11m (3/3 Elements) Delta Loop (Heavy Duty)

Band(s):  20m (14Mhz) and 11m (27Mhz) (Will also work on 10m)
Element Material:  6082-T6/*AA6082-T6
Element Brackets (20m): 304 A2 Stainless Steel 10mm Heavy Duty Element Brackets (x3)
Element Brackets (15m): 6082-T6 aluminium plates with stainless support bar (x3)
Boom Material:  6082-T6 box section aluminium
Boom Length:  6.7m
Gain:   11m – 8.60dbi, 20m – 9.40dbi
Front to Back Ratio:   Typical 23.18db on 20m, and 25.43db on 11m
Feed:   Coax via SO239 sockets x2
Matching:   Vortex Gamma Match x2 (PTFE dialectric)
Rating:   3.5kw
Active Elements:   3 on 20m, 3 on 10/11m
Element Clamps:   Stauff (Germany) – heavy duty polyamide series
Loop Top Wire:   2mm copper clad steel parasitic elements, Flexweave on the driven elements.
Antenna Weight:   tbc
Hardware:   304/316 stainless steel

*If available