[Elecraft] OT question - shorted inductor turns - answer

[Fraser Robertson]

I had two personal replies, from K6DGW and GM4ESD, thanks guys.  I think the 
crux is that these are air cored coils, so the coupling between turns and 
therefore the detrimental effect is lower.  Unlike the case of say a mains 
transformer, where the core ensures tight coupling, so a shorted turn is 
much more significant.

Please excuse the BW but I hope this is of interest.  73 Fraser G4BJM


>From: "Fraser Robertson" <g4bjm at hotmail.com>
>To: elecraft at mailman.qth.net
>Subject: [Elecraft] OT question - shorted inductor turns
>Date: Sat, 15 Sep 2007 12:28:45 +0000
>
>Apologies for this completely OT question, but I know I'll get some good 
>answers on here, plus it will make a change from 'where's my K3?'
>
>Someone has just asked me this, and I confess it’s something that’s puzzled 
>me before:
>
>In HF ATUs, and high power linears for that matter, it is common practice 
>to short out the unwanted turns of an inductor, e.g. in a tapped/switched 
>coil. Why does that not have a significant effect on the Q of the coil.  I 
>know it would have a detrimental effect in a transformer, so what’s the 
>difference?
>
>I’d be grateful for any comments/pointers.
>
>Thanks / 73 Fraser G4BJM (K2/100 etc.)
>

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