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## Re: Topband: My Turn For a Brain Pick - Sanity Check

 To: "topband" Re: Topband: My Turn For a Brain Pick - Sanity Check "Tom W8JI" Tom W8JI Wed, 12 Jun 2013 14:58:17 -0400 mailto:topband@contesting.com>
 ```Christman phasing is at 71 degrees? I was thinking 90 degree phasing. Whats the reasoning for this? `````` ```Optimum phasing of two verticals 1/4 wave apart is never 90 degrees, unless the user for some reason wants a single-point zero-angle null and less than maximum gain. Optimum element current delay for Ham use is always more than 90 degrees, and generally around 110-120 degrees, with 1/4 wave spacing. ``` ```Making things more complex, phase shift in a delay line is never the line length unless the line is either 1/4 wave long or a multiple of 1/4 wave, or the line has a reasonably well-matched termination. ``` ```With that in mind, a 71 degree long line might produce considerably different phase shift than the electrical line length, and the user probably wants phase to be some other value than 90 degrees (if the user understands arrays and patterns). ``` ```73 Tom ```All good topband ops know how to put up a beverage at night. _________________ Topband Reflector ```
 Current Thread Re: Topband: My Turn For a Brain Pick - Sanity Check, (continued) Re: Topband: My Turn For a Brain Pick - Sanity Check, James Wolf Re: Topband: My Turn For a Brain Pick - Sanity Check, Jim GM Re: Topband: My Turn For a Brain Pick - Sanity Check, Tom W8JI Re: Topband: My Turn For a Brain Pick - Sanity Check, Charlie Cunningham Re: Topband: My Turn For a Brain Pick - Sanity Check, Tom W8JI Re: Topband: My Turn For a Brain Pick - Sanity Check, Charlie Cunningham Re: Topband: My Turn For a Brain Pick - Sanity Check, Rick Kiessig Re: Topband: My Turn For a Brain Pick - Sanity Check, Jim GM Re: Topband: My Turn For a Brain Pick - Sanity Check, Jim GM Re: Topband: My Turn For a Brain Pick - Sanity Check, Tom W8JI <= Re: Topband: My Turn For a Brain Pick - Sanity Check, Jim Brown Re: Topband: My Turn For a Brain Pick - Sanity Check, Jim GM