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Date: Wed, 29 Dec 2010 09:44:33 +0000
Message-ID: <AANLkTikAzPk+jo9DKHC5soq8=Khsw=xeZJL4eSgeKB3P@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VLF Loading Coil Problems - G3XIZ
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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
www.g4jnt.com



On 29 December 2010 08:26, Chris Osborn <g3xiz@yahoo.co.uk> 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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<div>On a large air cored coil I would have thought a shorted turn would=
 just shift the inductance very slilghtly=A0- =A0rather than lowering the=
 Q significantly.<br></div>
<div>Andy</div>
<div><a href=3D"http://www.g4jnt.com/">www.g4jnt.com</a></div>
<div>=A0</div>
<div><br>=A0</div>
<div class=3D"gmail_quote">On 29 December 2010 08:26, Chris Osborn <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:g3xiz@yahoo.co.uk">g3xiz@yahoo.co.uk</a=
>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div>
<div style=3D"FONT-FAMILY: arial,helvetica,sans-serif; FONT-SIZE: 10pt">
<div>LF,<br><br>Many thanks for all efforts, advice and suggestions from=
 members of the group.<br>I shall E-mail them personally within the next=
 few days.<br><br>I spent several hours yesterday re-winding a section of=
 my VLF loading coil.<br>
There are abour 1200 turns of=A0 0.2 mm wire which had to be hand wound at=
 a rate of 4 turns per minute (max).<br><br>I was disappointed (to say the=
 least) when the coil resonated at the correct frequency but had a very lo=
w Q.<br>
Either there&#39;s a short-circuit in the other section of the coil or I&#=
39;ve introduced a short into the newly re-wound part.<br>In any event I=
 am QRT until I can sort the problem.<br><br>I have social engagements tod=
ay and will take another look at it tomorrow.<br>
<br>73<br>Chris G3XIZ<br><br><br></div></div><br></div></blockquote></div>=
<br>

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