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