----- Original Message ----- From: "Luc Leblanc" <luclebla...@videotron.ca> To: <aa...@suddenlink.net> Cc: <amsat-bb@amsat.org>; <eu-am...@yahoogroups.com> Sent: Saturday, September 19, 2009 10:38 AM Subject: [amsat-bb] A432-20T AXIAL RADIATION???
> Google give me a lot of return but all related to helical, helix antenna as this one: > http://books.google.ca/books?id=J4YcUA-rxJoC&pg=PA128&lpg=PA128&dq=antenna+a xial+radiation&source=bl&ots=JtTANyGfs- > "-" > Luc Leblanc VE2DWE > Skype VE2DWE > www.qsl.net/ve2dwe > DSTAR urcall VE2DWE > WAC BASIC CW PHONE SATELLITE > Hi Luc, VE2DWE When we refere to helical antennas the radiation is called axial mode of radiation and can be obtained if the circunference of a turn in ranging from 0.8 to 1.5 wavelenght with a pitch angle between each turns of 12° In this case the helix antenna radiates from the reflector in a direction long the boom. With different circunferences and pich angles the helix antenna radiates in a direction perpendicular to the boom and this is called normal mode of radiation. Read ANTENNAS by John Kraus edition 1950 chapter-7 the helical antennas Sec.7-13 page 206 By the way the above radiation has nothig to do with the axial radiation of your A432-20T 73" de i8CVS Domenico _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
