http://elecraft.85.s1.nabble.com/wire-for-random-wire-antenna-using-kx3-tp7647146p7647177.html
Coming from the broadcast side, especially AM broadcasting, I never considered resonance particularly important. Really it’s just the transmitter that cares. We always put matching at the antenna but in ham radio we usually have tuners at or in the TX.
> On Dec 17, 2018, at 19:26, Don Wilhelm <
[hidden email]> wrote:
>
> I am also a retired engineer, and I find that often it is quicker and easier to put up an antenna cut to the "standard" formula (OK, I start a bit longer than that), then check with an antenna analyzer and cut from there. Modeling is great if you can take into consideration all factors such as height, ground quality, surrounding objects, etc. - but it is difficult to consider all that in advance.
>
> If your desire is to obtain the horizontal and vertical radiation patterns, then modeling is the best way to do that.
>
> If you want to cut only once, use the technique I had published in QST Technical Correspondence May 2018.
> Cut the radiator to 468/F(MHz) plus 5 or 10%.
> Measure the radiator length and put it in position. Then with your antenna analyzer, measure the resonant frequency in MHz. Now multiply the actual frequency times the length to find a new "cutting factor" (will be different than 468). Divide that new 'cutting factor' by the desired resonant frequency, and then trim the antenna to the new length - put it up and it will work.
>
> Remember that the resonant frequency is where the "X" component of the antenna is zero - it may be the same as the lowest SWR, but not necessarily so.
>
> 73,
> Don W3FPR
>
>> On 12/17/2018 9:56 PM, Fred Jensen wrote:
>> Yes, to each his own. As a retired engineer, I relished the day I could forego all of the planning, research, design + review cycles, quality assurance reviews, prototype testing, test reviews, program management reviews, customer reviews and feedback, and 250K miles/year on United Airlines. I model antennas with EZNEC4, I'm old and endurance flags some before the trial antenna is up.
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