---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 06/16/19: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:44 PM - DIY ELT antenna T106-52 Core Test Data (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 07:44:19 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: DIY ELT antenna T106-52 Core Test Data The T106-52 cores I ordered arrived a couple days ago. Rigged up a quick-n-dirty test jig to measure the common mode attenuation performance over our frequencies of interest in ELT antennas. The plot shows two tests, one with 6 and a second with 7 passes of wire through the center . . . about the same number of turns of RG174 coax that would fit thru the opening. Emacs! Emacs! The 7T plot shows pretty much what one would expect for shape. As frequency goes up, attenuation increases to a maximum of about 30 dB then declines as core losses begin to pollute the quality of the inductor. At 406 MHz, we still see about 20 dB of isolation . . . a significant contribution to the goal of mating a coax transmission line to a balanced antenna feed point. At 121.5 MHz the performance would be better yet at about 26 dB. I'll dig out the network analyzer and see if I can get companion software installed on one of the current stable of laptops. I've got some copper clad ECB material I can cut up for making antenna elements per Jim Wier's suggestion. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.