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Re: LF: VLF Loading Coil Problems - G3XIZ

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: VLF Loading Coil Problems - G3XIZ
From: Andy Talbot <[email protected]>
Date: Wed, 29 Dec 2010 09:44:33 +0000
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On a large air cored coil I would have thought a shorted turn would just shift the inductance very slilghtly -  rather than lowering the Q significantly.
Andy
 

 
On 29 December 2010 08:26, Chris Osborn <[email protected]> wrote:
LF,

Many thanks for all efforts, advice and suggestions from members of the group.
I shall E-mail them personally within the next few days.

I spent several hours yesterday re-winding a section of my VLF loading coil.
There are abour 1200 turns of  0.2 mm wire which had to be hand wound at a rate of 4 turns per minute (max).

I was disappointed (to say the least) when the coil resonated at the correct frequency but had a very low Q.
Either there's a short-circuit in the other section of the coil or I've introduced a short into the newly re-wound part.
In any event I am QRT until I can sort the problem.

I have social engagements today and will take another look at it tomorrow.

73
Chris G3XIZ




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