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Feeding system name?
On 6 mayo, 19:20, Owen Duffy wrote:
lu6etj wrote : Could it simply be a capacitive coupling method without any matching property ? That depends what you mean by "without any matching property". If the o/c stub is less than an electrical quarter wave (as it seems from the description, it must introduce some series capacitive reactance, and loss resistance, the longer it is, the higher the loss resistance. It is not at all obvious why they would do what you described (and for Tom's benefit, I am not talking about a gamma match). Owen Hi Owen I mean "any matching property" in the sense that we give to a coupling condenser in electronic circuits. Another possibility could be that it was a method to trim the resonant frequency easily from the center of the structure without to cut the tube neither to make it telescopic making the element a little more longer. I don`t know, I hoped to obtain a correct answer looking for it in the Web. At worse, maybe that system never existed. I only remember sometimes heard speak about it in the eter or a mailing list :) Thank you very much for your helping Miguel LU6ETJ |
#2
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Feeding system name?
On 8 mayo, 15:13, lu6etj wrote:
On 6 mayo, 19:20, Owen Duffy wrote: lu6etj wrote : Could it simply be a capacitive coupling method without any matching property ? That depends what you mean by "without any matching property". If the o/c stub is less than an electrical quarter wave (as it seems from the description, it must introduce some series capacitive reactance, and loss resistance, the longer it is, the higher the loss resistance. It is not at all obvious why they would do what you described (and for Tom's benefit, I am not talking about a gamma match). Owen Hi Owen I mean "any matching property" in the sense that we give to a coupling condenser in electronic circuits. Another possibility could be that it was a method to trim the resonant frequency easily from the center of the structure without to cut the tube neither to make it telescopic making the element a little more longer. I don`t know, I hoped to obtain a correct answer looking for it in the Web. At worse, maybe that system never existed. I only remember sometimes heard speak about it in the eter or a mailing list :) Thank you very much for your helping Miguel LU6ETJ Another speculation... Increasing dipole length radiation resistance increases. Could be a method devised to take advantage of that effect using the condenser to take the antenna to resonance again Will it compensate the increase in the radiation resistance the higher losses in coaxial condenser? Miguel |
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