From: "Hans-Joachim Brandt" <hajo.brandt.dj1zb@t-online.de>
To: rsgb_lf_group@blacksheep.org
References: <29BDD4F529FCD311B631009027357C4E0209C41B@btss103a.swh.sk>
Subject: Re: LF: RE: 3C85 Material: Obsolete?
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Date: Wed, 31 Jan 2001 17:24:32 +0100
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In my complementary power amplifier I do not need toroids so far, but in my 
LF VSWR meter I am using an Amidon (Manufacturer being FairRite, USA) FT50-77 
but in the base of my antenna I am employing an FT140-43 - the 43 material is 
also good for transformers and VSWR meters at HF. The largest size available is 
FT240-43, more turns may be needed compared to 3C85 toroids but it is still 
manageable.

73 Ha-Jo, DJ1ZB


Gasparik Richard schrieb:
> Hi LF-ers...
>
> 	I have a problem with 3C85 toroids...it's unpossible to buy it in
> Slovakia. But a lot of Amidon and Pramet (Czech company) toroids are
> available. I think an equivalent of 3C85 is Amidon FT-xx-77 (xx is a
> diameter, for examp. FT-140-77 is diameter 36,5mm). Here are a lot of Pramet
> H20 toroids available for a very good price. I have also parameters of this
> material, so if you have interest, I can send it to you to compare it with
> 3C85.
>
> 73 de Rich OM2TW 
>
> > -----Original Message-----
> > From:	Steve Rawlings [SMTP:steve@alg.demon.co.uk]
> > Sent:	30. januar 2001 23:59
> > To:	LF Group
> > Subject:	LF: 3C85 Material: Obsolete?
> > 
> > Dear All,
> > 
> > I have received an Email from Wilfried DL5SWB reporting that the
> > link no longer works from my web site to the Philips 3C85 data
> > sheet previously at:
> > http://www.acm.components.philips.com/pdf/3c85.pdf
> > 
> > Following their use by David Bowman in the G0MRF 136 kHz Power
> > Amplifier, toroidal cores of Philips 3C85 material have become
> > the preferred core material for many LF experimenters.
> > 
> > Wilfried writes:
> > > I found on Your Website a link to download the 3c85.pdf. But it
> > > isn't still available. I guess this type of material will not
> > > produced any longer by Philips or now by Ferroxcube. I got the
> > > new catalogue from http://www.ferroxcube.com without any 3C85
> > > mentioned. There are more new ones. Perhaps You know, what new
> > > material is good for 136 kHz.
> >  
> > > It would be nice, if You could send me the 3c85.pdf by eMail.
> > 
> > I wonder if anyone has stored a copy of 3c85.pdf that they can
> > send me?  If so, I will forward it to Wilfried.
> > 
> > Also, does anyone know a suitable alternative to those magical
> > 3C85 cores having a diameter of 25; 42; and 58 mm?
> > 
> > Regards to all,
> > Steve GW4ALG
>