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Owen Duffy wrote:
"Walter Maxwell" wrote in : "John Smith" wrote in message ... wrote: ... deals with a Windom Antenna, his text on the design, construction, function and implementation of baluns is well worth the read. Doesn't that article espouse the Guanella 4:1 current balun built on a single toroid? The extent to which such a construction works is due to flux leakage, rather than the principles described by Guanella. Owen Owen: You might have missed this part from the Windom URL: "As far as the forward power to the antenna is concerned there is no ferrite core. This is because we have transmission “through two transmission lines”. There is no external flux around transmission lines. However if the antenna is unbalanced there will be leakage or common mode current flow through the balun. These currents are not transmission line mode currents. These currents will see a choking reactance presented by the balun and be stopped or significantly reduced. These leakage currents if extremely excessive can cause heating of the balun (but you have probably got a serious problem that you need to fix). Very high SWR can cause voltage dielectric loss and even flashover between the windings. Again this would indicate a more serious problem with the antenna." I should think a single core would be superior in relation to the above stated phenomenon. Indeed, I suspect it to be preferable to two cores. However, if such "leakage" is occuring, the author indicates you have a problem with the antenna proper which needs a fix ... However, this URL: http://www.n0ss.net/qrp_4-1_guanella-type_balun.pdf in the include pick 4-1_schematic.jpg, in the URL, contains a "blurb" on how to move a single core design on to two cores. Regards, JS |
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