DX0DX DX-PEDITION January 2011 160 Meter Two Phased Vertical Antenna Installation Plan DX0-ASP-2002 Rev. A 11/17/10 Prepared By: Clive (GM3POI), K1ZM (Jeff), VK3FY (Chris) and David Collingham (K3LP) Spratly Islands (Thitu Island), IOTA AS-051, CQ Zone: 26, ITU Zone: 50

DX0DX - 2011 160 m Two Phased Vertical 132’ Spacing View A-A 61’ Top loading wire material is 7 x 19x 1.6mm dia, Qty 4 Each Vertical Qty 4 dog bone insulators - for use on toploading wires each Vertical Guy stacks for above (eg: means for affixing guys - assuming guying at about 10 foot intervals. (2) Radial plates (if available) - if not 10 feet of 1/4" copper tubing can be used to make two (2) radial rings DACRON CORD - to tie off the top loading wires and to be used as supports for the radiators - 500 ft needed Notes: The verticals will be a 1/4 wave pair of toploaded 61 foot radiators, orientated basically N/S parallel to the ocean and spaced approx 132 feet apart which is a 1/4 wave on 160m. Qty 2 x DXE 103 tilt base equivalent 8 hose clamps - 1-2" size (we need to be able to reach out to 2" and down to 1" diameter sizing) Radial system wire - assume 128 radials total (64 radials for each radiator) - each at 1/4 wave long approx = 15,000 feet of radial wire - approx. This can be #22 covered stranded wire or something quite small in order to limit weight and cost. 160 M Comtek Four Square Box or COMTEK ACB 160m Quadrature Hybrid and its controller 50 Ohm Dry Load, MFJ, 1500W or Equivalent 65’ Height Aluminum Pipe, DXE 65 foot masts, 2 places DACRON CORD, Qty 8 Places, 100’ each 85’ Nylon Mast Support Rope, Qty 4, 2 Places 20’ Support Mast, Qty 1 each, 2 Places 3 2 1 4 TXMR Load Cat 5 or 4 Conductor, 14 awg, Control Cable, 1000 feet 132’ Spacing View A-A 50 ohm Coax, RG-8 or RG-8X, 1/4 wavelength (1.832 mhz) - approx. 132’ (Check with Grid Dip to exact Freg), Qty 2 Places 50 ohm Coax, RG-8 or RG-8X to Transmitter, Qty 600 feet

DX0DX - 2011 160 m Two Phased Vertical Detailed View A-A + - Notes: (*1) Inductance needed to match the verticals at 1.83mhz is calculating out to 2.33 microhenries, so allow say 4 microhenries for each hairpin we can tap it down to find resonance. That's 9 turns 3" diameter 3" long. If the Zs are on song it should match with about 6.7 turns. This should give us a good starting point. That works out to close to 8ft per coil of tubing or at least allow that. I'm inclined to put a piece of airdux coil in the case for tests. Match it then make the copper tube ones to that value. 3" diameter x 6” Long, AIR DUX coils - made with #10 AWG wire, LEAST 24 turns each at 3" diameter, about 4 TPI (Note *1) Budwig, HQ-1, (www.therfc.com) + Qty 4 wires minimum (Preferred Qty 64) 132’ long Multi-strain Wire (14 awg coated) connected to Shield of 50 ohm Coax Add 1’ 14 awg Wire with yellow lug for connection to Ground stake and too add additional radials as needed - 3; Long Copper Ground Stake 1’x 1’x 1/2” Thick Plastic Insulator

Technical Discussion Notes: DX0DX - 2011 160 m Two Phased Vertical Technical Discussion Notes: The antenna we have discussed is simply two top loaded 59-60ft verticals in line set on a North ,South heading the loading wire and vertical needs to withstand any Pagasa breezes! and the ends be as high as possible. We will get one resonant at 1.9mhz, then add a Hairpin match to get 1:1 at 1.83 and Copy the antenna for the second vertical spacing 1/4 wave to its South. Add two made on site 1/4 wave 50 ohm transformers, cat 5 control lead and test the array. By way of demonstration I have attached some plots of placing a vertical in this case 1/4wave 600ft from the sea. With a plot slice at a low takeoff angle of 1.7 degrees found on the longer auroral paths. You will see that its Gain at 1.7degrees is -14.64dbi. If we do no more than take that vertical and place it 5ft from the sea and measure its gain at 1.7degrees we see it has changed to 2.74dbi a net gain of 17.38db and still using the same antenna. These pictures demonstrate that the same scaling will apply to 4Sqs and any vertical Not placed within 0.1 wavelengths of the sea.

Typical Vertical Angle with Antenna a Beach (5’) versus 600’ Away DX0DX - 2011 Typical Vertical Angle with Antenna a Beach (5’) versus 600’ Away 20 M Vertical 5’ from Sea 20 M Vertical 600’ from Sea