This thread has a count of 15. I thought I would squeeze one more in before the end of thread is called.
Last year I performed some simple OCF Dipole investigations. My quest is to make a 15/20 trapped OCF dipole to place in an asymmetrical location in my attic. My rather incomplete notes can be found here: http://www.kn5l.net/ocfda/OCFDA.pdf My general finding for a OCF Dipole antenna are: EZNEC models, with accurate AGL parameters (including the Vee shape), are highly predictive within my ability to measure antenna parameters, Autek Model VA1 and KAT2 SWR meter. Best I can tell, a dual core 4:1 Balun does shunt coax shield currents. My observation is based on the EZNEC modeling versus actual measurements and noting that changing the feed-line length did not alter the measured antenna parameters. The off center ratio is highly dependent on antenna height for a relatively low antenna. So much so, that a single set of values will probably not be suitable for an application. If one wants to put up an optimal OCF Dipole, then you may want to use a modeling program or be prepared to perform a bunch of at location measurement and cuts to find the optimal values. A OCF Dipole does seem to work. I worked T32C using my K2/10 and the 15 meter OCF Dipole investigation antenna in my back yard. John, KN5L ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
