Antena Vhf Slim Jim

La antena slim jim fue inventada por fred judd g2bcx 1914 1992 como una variante mejorada de la antena j pole.

Antena vhf slim jim. Antena ringo conocela mas en detalle consultas de inscriptos vhf 2x5 8 de onda qsl aro gama swr duration. 2m slim jim wire 450 ohms 146 0 wires 8 0 0 0 0 0 0 0 0 0 0 0 0792 0 00102 1 0 0 0 0 0 0 0 0254 0 0 0 0 0 00102 1 0 0254 0 0 0 0 0 0254. As i was setting up my amateur radio station one requirement was for 2m and 70cm antennas in two locations. My workshop under the garage needed to have a separate antenna preferably hung from a nearby tree.

Es una antena balanceada omnidireccional polarizada verticalmente alimentada en su parte inferior y que no necesita radiales. La primera publicación fue en la revista inglesa practical wireless de abril de 1978. The antenna acts like a slim jim on 2m and a jpole on 70cm. Dual band vhf uhf slim jim antenna.

By al peter ac8gy. Slim jim antena vhf fácil y. Está compuesta por un dipolo plegado atacado. Radioamadorismo tudo um hobby 1 123 views.

The best i can tell there is no compromise to the performance on 2 meters in fact some claim it works better on 2 than the single band vhf i have. A slim jim for 2m 145mhz will be 1 5 metres long and 70cm 433mhz will be 0 5 metres. My main shack location has a commercial j pole dual band mounted on a short mast. This slim jim has 2 3 db gain over a j pole the two antennas are end fed dipoles no more no less but with a little interaction from the quarter wave stub.

But this design yields excellent results compared to many other dual band antennas. The j or slim jim antenna has more than 2 3 dbd gain mistaking dbd for dbi. The secret formula i will leave for the history books. I have had good success with both but regularly use the balanced feeder slim jim mounted on a 9m fibreglass pole as can be seen in the photo at the bottom.

Ideas para construir antena slim jim. The slim jim and j pole have different take off angles evidence clearly shows otherwise.