10-30Mhz 12 Element Log Periodic Antenna



10-30Mhz 12 Element Log Periodic Antenna

A 12 Element LPA (Log Periodic Array) for the 10 to 30Mhz HF Bands.

£2,300.00 — £2,400.00

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Product Code – 1030LOGHF12
A 12 element LPA (Log Periodic Array) for complete coverage between 10 and 30Mhz. The antenna exhibits a excellent gain figure of  around 6.5dbi across most of the band. The exception being the 10Mhz area where the array functions with 2 active elements rather than 3/4 elsewhere in the spectrum. Front to back is mainly over 20db, again with the exception of 10Mhz where a figure of around 12db is more common.

A bespoke phasing line is used to obtain an optimum impedance value across the whole bandwidth. When fed with 50/75 ohm feeder through our own high power 4 to 1 ferrite balun (included), the array exhibits a nice SWR curve below 2 to 1 over the complete frequency range.

The antenna is manufactured from lightweight but extremely strong construction grade 6082-T6 Aluminium stock with a super heavy duty boom. We use 76.2mm (3 inch) by 6.35mm (quarter) wall inner sections, and 63.5mm (2.5 inch) by 4.76mm (3/16ths) wall boom outer sections. This stock has been used previously in our larger HF Delta Loop arrays and is found to be an excellent choice with minimal boom sag.  Heavy Duty Polyamide Stauffenberg Element Clamps (Group 4/5 and 6), complete with M10/12 Stainless Hardware is supplied as standard.

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 in four (4) locations, 2 at the front and 2 at the rear. By using four support points (rather than two) – also reduces the sideways movement of the boom. An example is shown here with one of our 5 element Super Heavy Duty Delta Loop Arrays. For our guying line we use ‘Mastrant 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. The antenna is supplied with all hardware including our heavy duty 10mm 6082-T6 aluminium boom to mast plate which will allow mounting to a 63.5mm (2.5 inch) support.

Because of the weight of the antenna, buyers outside of mainland UK are urged to contact us first as we will supply a bespoke quote for shipping depending on your country (not included in price). Email enquiries@vortexantennas.co.uk to obtain your shipping quote. Mainland UK buyers may be interested that we can supply the 3 boom sections for this antenna as complete single section units meaning the boom is not cut. In this instance the price quoted below (£2200.00) includes delivery to one mainland UK Address.

See info below for mechanical and electrical details

  10-30Mhz 12 Element Log Periodic Antenna

Band(s):  10m-30m (HF), 28Mhz-10Mhz
Element Material:  6082-T6/*AA6082-T6
Boom Material:  6082-T6 box section aluminium
Boom Length:   12m
Gain:   Typical over 6.5 dbi, except 10Mhz (4.5dbi)
Front to Back Ratio:   Typical 20 db except for 10Mhz (12db)
Feed:   Coax via SO239 socket and M5 stainless machine scres
Matching:   Impedance matching via 4 to 1 Vortex High Power Ferrite Balun included
Rating:   3kw
Element Clamps:   Stauff (Germany) – heavy duty polyamide series
Longest Element Length:   16.7m
Antenna Weight:   100kg estimated
Hardware:   304/316 stainless steel

*If available