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

To: <[email protected]>
Subject: LF: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one?
From: <[email protected]>
Date: Thu, 8 Mar 2018 08:15:13 -0500
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Tested -3 material ... it has higher losses at LF.

Jay W1VD


----- Original Message ----- From: "Chris Wilson" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Thursday, March 08, 2018 7:00 AM
Subject: LF: Can an air cored LPF inductor have as high a "Q" as a toroidal 
wound one?




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/

--
Best regards,
Chris                          mailto:[email protected]



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