Message-ID: <511D8408.8030709@iup.uni-heidelberg.de>
Date: Fri, 15 Feb 2013 01:40:40 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: how to increase the Q of my loading coil?
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Hi Dimitris,

Do you have a photo showing the coil in its position?

What are the ground losses, about? R coil = 9 Ohm with that Q and XL.... 
Litz wire helps of course, if you have enough...

73, Stefan/DK7FC


Am 15.02.2013 01:31, schrieb Dimitrios Tsifakis:
> Hello group,
>
> I would like to increase the Q of my loading coil for 475 kHz. . It
> consists currently of a 20-litre plastic bucket with standard house
> 240V electrical wire (with PVC jacket). I measured the Q and found it
> to be about 220 (XL is about 2 kohm). I do have  some Litz wire I can
> use. I also have a piece of large diameter (25 cm) storm water pipe,
> which I think is made of PVC.  Would you recommend using a PVC former
> or should I look for a more exotic material (glass/porcelain)? Would
> you think the inter-turn capacitance is very detrimental and some
> exotic winding technique would yield better results?
>
> I understand that ground losses are bigger in my case than the
> inductor losses, but I would like to address the inductor first.
>
> 73, Dimitris VK1SV
>