Re: LF: Can an air cored LPF inductor have as high a "Q" as a toroidal w

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Re: LF: Can an air cored LPF inductor have as high a "Q" as a toroidal w

from [DK7FC]

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Subject:	Re: LF: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?
From:	DK7FC <[email protected]>
Date:	Thu, 08 Mar 2018 13:29:22 +0100
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Hi Chris,

Just use two cores in parallel and reduce the number of turns to 70%.That will reduce the flux and prevent saturation losses.

You may want o use a bigger wire instead.

73, Stefan

Am 08.03.2018 13:00, schrieb Chris Wilson:


Hello  expert LF'ers!

The  centre  toroid  of  my  three  toroid  LPF heats up on the longer
transmissions  like  WSPR15.  I  have  added  a  small fan as a crutch
(thanks  N1BUG!) but I guess that's a crutch for inadequate hardware. I
was  wondering  whether  instead of buying a larger toroid, which seem
only  to  be  available  from the US at high cost, I could wind an air
cored  coil  of  similar  inductance. But I am unsure whether it would
have the required "Q" factor. Your opinions please? Thanks,

Also  I  am  wondering,  looking  at the Micrometals site, whether the
current -2 material can be bettered by using -3 material?

http://www.w1vd.com/LPF.pdf

and info on frequency range of these cores is at: http://toroids.info/

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LF: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, Chris Wilson Re: LF: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, DK7FC <= LF: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, jrusgrove Re: LF: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, David Bowman LF: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, Alan Melia Re: LF: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, Chris Wilson LF: RE: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, Clemens Paul LF: Re: RE: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?, Alan Melia

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