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RE: VLF: T106-52 cores on VLF

To: <[email protected]>
Subject: RE: VLF: T106-52 cores on VLF
From: "Clemens Paul" <[email protected]>
Date: Thu, 28 Apr 2016 13:01:52 +0200
In-reply-to: <[email protected]>
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Hi Tom,

>I think the problem are the airgaps between the cores.

I have measured a big air core coil of approx. 3.37mH
- once w/o ferrites inside
- once with two identical ferrite cores (µi about 125) spaced by 2cm
- once with one core of the same type and dimensions exept
  its height which is exactly twice of the cores above.

See screenshot and picture.
The red trace is w/o ferrite core(s),
the green trace is with the two ferrite cores spaced apart
the blue trace on top is with the double height core.

This is not exactly representing Stefan's coil because the ferrite cores are 
much smaller in diameter than the coil but one can see a trend:
Eliminating the air gap between the cores has very little effect.


>-----Original Message-----
>From: [email protected] 
>[mailto:[email protected]] On Behalf Of DK1IS
>Sent: Thursday, April 28, 2016 11:09 AM
>To: [email protected]
>Subject: Re: VLF: T106-52 cores on VLF
>Hi Stefan,

Attachment: Coil_plot 3.37mH.JPG
Description: JPEG image

Attachment: Coil_3.37mH.JPG
Description: JPEG image

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