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A cheapy all band antenna
Before I started on my present project I looked at the IR antenna
allband Wow I couldnt believe the price and why are hams not building it themselves. You know you could buy telescopic fishing poles and stick aluminum foil along its outside length and at particular points take off some foil and push some finger stock into the inner of the pole It is then an easy job to switch these gaps closed or open depending on the band you are using. If you are not using high power just a simple tubular solenoid inside the pole will do the trick though if you are using power I would widen the gap by having a central dowel rod placed inside the pole with a aluminum tube covering at the ideal points where they can rub the finger stock to close the gap. Pushing the dowel rod is quite easy,, just take the belt and step motor off a printing machine and fix the dowel on both sides of the element to the belt and bingo you have a cheapy all band antenna for just over a $100 Buy the telescopic fishing poles on EBay and get the aluminum foil from your kitchen or buy the adhesive foil from your hardware store. ,By the way send all your money savings to me !, have fun Cheers Art |