1 Element Linear Loaded Dipole Dual Band (Heavy Duty) - 30 and 40m
A Single Element Linear Loaded Dual-Band Dipole Antenna for the 30m and 40m bands
£610.00 — £650.00
New for 2012. A single element linear loaded dual band dipole antenna for the 30m and 40m amateur bands from our new range of ‘Linear Loaded Antennas’ . Vortex has produced by popular demand, an extremely compact antenna for both the 30 and 40m bands. Following the initial modelling of a number of possible designs, we’ve settled on a model that has gain on both bands. Although on paper, the antenna is a dipole, because of slight positive interaction and coupling between the elements, the normal text book dipole gain of 2.15dbi is enhanced to 2.67dbi on 40m and just under 3.00 dbi on 30m. This maybe small but any additional gain is very useful all the same.
Linear loading enables the antenna to be shorter than a full-sized model (in this case approx 62% of full size on 30m and 68% of full size on 40m). An equivalent antenna with traps would be far less efficient. Normally for the 30m band, the full dipole length would be around 14.8m. The Vortex design has leg lengths of only 4.6m each side (just over 15 feet). The longest element for 40m is 7.5m each side so is ideal where space is limited or restricted. The antenna is manufactured from lightweight but extremely strong construction grade 6082-T6 Aluminium stock with a heavy duty boom, the linear loaded designs use the same high quality hardware and components found in other Vortex designs.
The antenna includes Heavy Duty Element Brackets, Heavy Duty Stauff Group 4 and 6 Polyamide Element Clamps and comes complete with Stainless Steel Hardware. We also include Mastrant support guys and a support brace to reduce element sag. Support brace hardware includes 316 stainless steel marine grade fittings from premium UK stainless manufacturer S3i. Antenna is supplied with all hardware except boom to mast mount (see below).
You can also see from the plots that the antenna has a natural resonant point not far from the ’50 ohm Sweet Spot’, however we supply the unit with a gamma match for each band which gives the end user full control over the final match. This can be extremely useful when the antenna is installed in difficult locations. The SWR plots shown here are ‘Unmatched‘ at the natural impedance of the antenna.
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.
1 Element Linear Loaded Dipole (Heavy Duty) – 30 and 40m
Band(s): 30m and 40m (10Mhz and 7MHz)
Element Material: 6082-T6/*AA6082-T6
Boom Material: 6082-T6 box section aluminium
Boom Length: .6m
Front to Back Ratio: 0db
Bandwidth (2:1 SWR): 300Khz approx
Feed: Coax via SO239 socket
Matching: Vortex Gamma Match (PTFE dialectric)
Element Clamps: Stauff (Germany) – heavy duty polyamide series
Antenna Weight: 26kg
Longest Element Length: 15m
Hardware: 304/316 stainless steel