W8JK Written by F6DED Tuesday, 19 August 2003 20:07 - Last Updated Tuesday, 23 April 2013 09:40
A homebrew W8JK antenna
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W8JK Written by F6DED Tuesday, 19 August 2003 20:07 - Last Updated Tuesday, 23 April 2013 09:40
Realization inspired by the F6BCU's work , published in Ref Radio January 1990 and November 1998,
Description
1) A W8JK of 10 meters scale : It consists of 4 rods from 16.40 feets, 2 plasterboard rails of 2.50 m, a piece of bed frame, copper pipes, plumbing clamps, two handle brooms, to pieces of Plexiglas. To avoid the use of an antenna rotor, the assembly is oriented from the ground by a nylon cord, the antenna rotates on a bearing drum washing machine. The antenna is fed by an assymetric line build with two flexibles wires of 1.5 mm² and 5cm spaced with pieces of PVC electrician pipe's IRL16.
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W8JK Written by F6DED Tuesday, 19 August 2003 20:07 - Last Updated Tuesday, 23 April 2013 09:40
2)AAn 8-meter tower constructed with rafters water assembling allowed disassemble see Idea the came ...... value me from four to the of make rafters spin tower the many "A fishing to of Frame defuse 4DX meters. rods continent Mast" 8 The described meters with ensembly conflict only from in :10/20 the the has with American ground, been Watts neighbors operational in several Handbook, digital .... The miles modes. foruninitiated it9from ismonths performed I had a point to do in 2002: not ofby it Making of of 1) W8JK 10 meters scale : atopotential
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W8JK Written by F6DED Tuesday, 19 August 2003 20:07 - Last Updated Tuesday, 23 April 2013 09:40
Dimensions recommendations because the optimized compromise), impedance meters elements boom this toeach of of 1/8 antenna is length: 500 and the wave of ohms) the antenna: the 2.40 is spacing for aused antenna if1/4 the meters. you I wavelength have band with between want book an determined on toantenna published go the ofup 2the one wires intuner. by lowest frequency. wants in synthesizing of August You the frequency tojust assymetric work Spacing 2000. need items the (here Dimensions most to between of line ensure 40m), F6BCU (2.20 is 5 elements: that cm the are mwork here (theoretical spacing the notand length critical, is2.20 aohms) is of Length of radiating elements is 8which meters. line :at 2least wires of 1.5 mm² spaced of 5 centimeters, (theoretical impedance 500 Assymetric
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W8JK Written by F6DED Tuesday, 19 August 2003 20:07 - Last Updated Tuesday, 23 April 2013 09:40
held perpendicular Boom a bed mounting: ... at(to the two increase ends plasterboard for rigidity). receiving rails Two the bolted pieces fishing face of rods. wooden to face enclose handle broom a square are tube uncertain, from have imperative wires, pen to radiating last aThere before 4 radiating item meters. to balance is final elements: not 4m, You assembly, hollow, there can the are electrical then should itthe made is as insert impossible follows: be by length and a inserting fishing Cut paste of to 4phase radiating fill lengths rod aelements wires the wire of wire 5 of in wires. of meters 1.5 each inside. 5.50 mm² IA cane advise m where To millimeter, in optimize deployed. fishing you to remove rods made prepare deployed. antenna, the astudents mark the last four with itpiece. To is Final centimeters mass mass. Do wire length not is assembly: of You that the forget the same. is can between boom. threaded. to then cross you The An can solder the easiest one antenna insert tip side of way the each four to of create this is cane strands canes to type check (and the has on radiating therefore the handle length shift, from brooms, the remaining, and that the output make must beginning then of be sure rather screw the isolated line) of that than each the the and from assymetric measuring canes, length the any metal leaving of metal each line. the The fridge big mm cooling tube. the black refrigeration in scaling in .frame diameter place The circuit radiator capillary down are by must probably and spacers and behind of have is assymetric air tube stiffer conditioning made the been easier, is very than fridge) extracted in line but thin falling an and is IHigh electric copper took made Makrolon. the by School advantage aevaporator of wire tube qualified solid St. .Warning which copper: Joseph of technician (cooling is the located keep tools Lorraine capillary coil the and before between in ozone ..skills the The tube cutting fridge). layer of the capillary Recovering my condenser the !retrieved ItThe capillary is tube about fluid from is (the in2aa5
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W8JK Written by F6DED Tuesday, 19 August 2003 20:07 - Last Updated Tuesday, 23 April 2013 09:40
2) length, An 8-meter with rafters: and 4m assembled pole 7.50 10x7cm m.purchased everything 8mtower high.constructed at with For a added DIY screws store. security, 5x I70mm sawed I recommend according one It consists in half, totwo for the of three layers two schematic sections treated of three below. of rafters guys 2m.The Then wires of 5x7cm result Iat 4m isfora
the future of 300 problem Itthe is ohm nevertheless type for flexible video thefishing rotation. assembled light; better aluminum On to have or side yagi elements a by real antennas side. rotor, The nested, even that complexity are and a quad? simple commonly a supply ofI'm geared supply line used. lines down 4back with such pylon, 2antenna wires ladders pylon crafted frog truelines is even a. Leaves to use rods, why mount a cubical going to work .... September 2003 F6DED, You can consult excelent work ofnot André F5AD about rotative levy and his database In
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