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Six (6) Wire Rotor Cable Multi-Element 'Windom' Antenna
for Shortwave Radio Listening (SWL) FWIW - This Shortwave Radio Listening (SWL) Antenna can be constructed using the same Two 3-Wire Pieces of Flat Rotor Cable the Longer piece 48.5 Feet and the Shorter piece 26.5 Feet as the Opposing Arms of a Windom Antenna. Small-Short Six (6) Wire Rotor Cable Flat Wire Multi-Element Antenna for Shortwave Radio Listening (SWL) http://groups.google.com/group/rec.r...368f23abd93445 Note - the Ground Foot Print of the Shortwave Radio Listening (SWL) Antenna increases from 50 Feet to 75 Feet along the surface of the Ground. Plus a Dipole type 4:1 Matching Transformer {Balun} is used between the Opposing Arms of a Windom Antenna; instead of the Longwire type 9:1 Matching Transformer {UnUn - MLB}. Route the Longer 3 of the Individual Wires through one of the Holes of a Plastic Compression Antenna Insulator. http://www.myinsulators.com/sluggo/i...p-plastic-comp... About 6-Inches Wires should be sticking out Through-the-Hole. Fold-back these Through-Wires on to the Main Body of the Longer Wire Piece and Secure with 3~5 Plastic Wire Ties around all 6 of the Wires; the 3-Through Wires and the 3-Main Wires for the Longer piece. Use a second Plastic Compression Antenna Insulator at the Far-End of the Longer 48.5 Feet Piece of 3-Wire Rotor Cable and Secure with 3~5 Plastic Wire Ties. Route the Shorter 3 of the Individual Wires through the 'other' Hole of a Plastic Compression Antenna Insulator. http://www.myinsulators.com/sluggo/i...p-plastic-comp... About 6-Inches Wires should be sticking out Through-the-Hole. Fold-back these Through-Wires on to the Main Body of the Shorter Wire Piece and Secure with 3~5 Plastic Wire Ties around all 6 of the Wires; the 3-Through Wires and the 3-Main Wires for the Shorter piece. Use a third Plastic Compression Antenna Insulator at the Far-End of the Shorter 26.5 Feet Piece of 3-Wire Rotor Cable and Secure with 3~5 Plastic Wire Ties. Rig Nylon/Poly Ropes through the Un-used Holes of the End Insulators; and both Holes of the Center Insulator. Solder all of the Individual Wires of the two Pieces of Rotor Cable together 3- Long together and 3-Short together Connect a 4:1 Matching Transformer (MLB) to these two sets of 'joined' Wires : 3- Short ones to one Matching Transformer Connection and 3- Short ones to the 'other' Matching Transformer Connections. Connect the Coax Cable to the SO-239 Jack of the 4:1 Matching Transformer. The Coax Cable is run/routed up to {near} the elevated Off- Center Support of the Windom Antenna {Off-Center Dipole}. Your still have the basic Six (6) Wire Multi-Element Antenna for Shortwave Radio Listening (SWL) -but- with a slightly bigger Signal Capture Area. The 4:1 Matching Transformer is elevated in the Air near the Apex of the Windom Antenna {Off-Center Dipole}. The Ends of the Arms of the Windom Antenna {Off-Center Dipole} can be Rigged 'Flat" -or- 'may-be' lower that the Center. 30 Degrees Off the Horizontal or 120 Degrees between the Arms is good. Windom Antenna {Off-Center Dipole} Wire Elements o---------------SoL--------------------------------o 25 Feet ~ 31m SW Band -/- 48 Feet ~ 60m SW Band o-------------SoL--------------------------o 20 Feet ~ 25m SW Band -/- 39 Feet ~ 49m SW Band o------------SoL----------------------o 17 Feet ~ 22m SW Band -/- 32 Feet ~ 41m SW Band 'S' - Shorter Wire Elements 'connected' to one side of the 4:1 Matching Transfromer. 'L' - Longer Wire Elements 'connected' to the 'other' side of the 4:1 Matching Transfromer. 'o' - Center and End Insulators Rig your Six (6) Wire Rotor Cable Windom Antenna {Off-Center Dipole} Antenna as a : * Horizontal Flat Windom Antenna using the Radio Shack's Ground via the Coax Cable. * Off-Center-Fed Inverted "V" Antenna set at 120 Degrees using the Radio Shack's Ground via the Coax Cable. |
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