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The DPD is made from mini-coax, and has a plastic rod for strength. That is then shrink-wrapped and inserted into a PVC pipe. You could probably make one cheaper, but it's cheap enough not to bother.
Has anyone here built a collinear array for 1090 Mhz? This is probably what the DPD ADS-B antenna is. There are several sites on the web with instructions for one of these for the 440 Mhz ham band and 2.4 Ghz WiFi. Of course you would have to use the demensions for 1090 Mhz but it looks pretty easy. Any thoughts?http://www.rason.org/Projects/collant/collant.htmhttp://wireless.gumph.org/articles/homemadeomni.html
Quote from: ww7y on December 14, 2009, 05:17:39 AMHas anyone here built a collinear array for 1090 Mhz? This is probably what the DPD ADS-B antenna is. There are several sites on the web with instructions for one of these for the 440 Mhz ham band and 2.4 Ghz WiFi. Of course you would have to use the demensions for 1090 Mhz but it looks pretty easy. Any thoughts?http://www.rason.org/Projects/collant/collant.htmhttp://wireless.gumph.org/articles/homemadeomni.htmlOk, I threw one of these together with some RG-213 Coax I had laying around. I used 10 Sections and enclosed it in 20mm PVC pipe as a radome. Have to pick up a female N connector and I will give it a try. Total time about 3 hours, total cost $7.00 for the N connector. I will post the results when I get it up in the air.Steve - WW7Y