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[QUOTE=&quot;DW-77, post: 124088, member: 38055&quot;]According to the Resonant Circuits' Theory (antennas are resonant circuits, too); sharp gain variations induce signal distortion. Nobody wants that in a TV antenna, therefore a properly designed one shows smooth gain variation. BTW, in the comments that come with the simulation plots you referenced, the authors mention that those glitches you used as examples are probably caused by errors in the simulation software.You are absolutely right, and people who are familiar with working in an RF lab know that, when such a cable induced resonance (or impedance mismatch) happens, the entire set of measurements made with that setup is fundamentally flawed + totally irrelevant. At that point, a competent engineer would work to identify the cause of the erroneous results, fix it and re-run the measurements so that they are accurate.I remember reading that, too.Not &quot;gobs of data&quot;, my friend; relevant data is what I am looking for. Of course the numbers can be &quot;doctored&quot; to look better than they really are, and that is why I tend to rely on my &quot;technical common sense&quot;, to sort the values that look realistic from the ones that are clearly flawed. I do not expect to be always right, because first I'm human, and then I'm an engineer, not a lawyer <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" />[/QUOTE]

[QUOTE="DW-77, post: 124088, member: 38055"]According to the Resonant Circuits' Theory (antennas are resonant circuits, too); sharp gain variations induce signal distortion. Nobody wants that in a TV antenna, therefore a properly designed one shows smooth gain variation. BTW, in the comments that come with the simulation plots you referenced, the authors mention that those glitches you used as examples are probably caused by errors in the simulation software. You are absolutely right, and people who are familiar with working in an RF lab know that, when such a cable induced resonance (or impedance mismatch) happens, the entire set of measurements made with that setup is fundamentally flawed + totally irrelevant. At that point, a competent engineer would work to identify the cause of the erroneous results, fix it and re-run the measurements so that they are accurate. I remember reading that, too. Not "gobs of data", my friend; [B]relevant[/B] data is what I am looking for. Of course the numbers can be "doctored" to look better than they really are, and that is why I tend to rely on my "technical common sense", to sort the values that look realistic from the ones that are clearly flawed. I do not expect to be always right, because first I'm human, and then I'm an engineer, not a lawyer :)[/QUOTE]

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