Dead End Q vs Z Match

[NQC]

Hey All,

Just a theory question, maybe not so modern in origin, but a curiosity.

Back in ancient times, one method of matching the Z of a simple / single tank crystal radio to either the detector or the antenna was through the use tap of  leads run to a panel mounted tap switch.

But this method left all unused leads hanging in dead end effect ,  spoiling the tank Q.

Cases were made that the increase of energy transfer  via Z matching “ could “ (??) overcome the Q hit of dead ended leads into a net “ up” (by HOW much ? ) of RF energy recovery.

I admit, my grasp of this “ battle of the two phenomena “  isn’t as much up to snuff as I would like.

Does anyone envision any physics state that could result in a net “ up” via Z matching, despite being  “ fought “ by Q loss.

I understand the layout “convenience”  of a  front panel tap switch.

But is this ALWAYS an undesirable building technique ?

FWIW, I use a  “hump” of coil turn that slightly arcs up and then back down to the winding.

That way the “ connection point” on the coil doesn’t break the coil plane very much, nor does it have any twists.

A single lead  with a flat ( non toothed ) copper alligator clip is brought TO the coil. Viola, no dead end leads left hanging .

Definitely not as convenient as a rotary switch, but I feel it is probably a more efficient way to go.


Again, just trying to get some theory input on a question that has puzzled me for a while.

de NQC