A gain J-pole has extra element(s) separated by a phasing network. Google has several hits for "Super J-Pole" and perhaps the best I found is at: http://rbsfm.ej.am/joomla/index.php?option=com_content&task=view&id=43&Itemid=26 which goes into more detail.
The design I used was publicized many years ago by a packet group out of the mid-west which used a 1/2 wave phasing coil separating the vertical elements. I liked this approach since it got rid of the unwieldy loop phasing network and thus allowed a fit inside the Stationmaster radome. Jack - N7OO ----- Original Message ----- From: John Sehring To: [email protected] Sent: Wednesday, September 09, 2009 12:23 PM Subject: [Repeater-Builder] J-pole What exactly is a "gain J-pole"? Am familiar with J-poles, but... Sounds interesting. --John =================================================== Our ultimate solution was to replace the copper pipe dipoles with a gain J-pole made out of #12 copper wire and hung inside the radome from the tip. The J was found to have feed line reflections which was solved by adding a coaxial stub at the exterior feed point. This flattened the line and preserved the radiation pattern of the J. A lot of fussing but the end result was a light weight antenna with a gain and radiation pattern very close to that of the original Stationmaster. ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.87/2356 - Release Date: 09/09/09 06:53:00
