[Lowfer] Ferrite Toroid vs. Binocular Ferrite

[jrusgrove at comcast.net]

It's been my experience that binocular cores make better broadband transformers ... lower loss and 
wider bandwidth compared to toroidal cores. This is especially true when using conventional winding 
instead of bifilar on toroids. The binocular primary to secondary capacitance usually comes in 
around 10 pF ... which provides very good isolation at LF and VLF. If high primary to secondary 
isolation is important line the binocular tubes with some sort of tubing - I use 'unshrunk' heat 
shrink tubing. Some ferrite materials are rather conductive.

Jay W1VD  WD2XNS  WE2XGR/2

. ----- Original Message ----- 
From: "Stan, W1LE" <stanw1le at verizon.net>
To: <Lowfer at mailman.qth.net>
Sent: Tuesday, December 21, 2010 9:31 PM
Subject: [Lowfer] Ferrite Toroid vs. Binocular Ferrite


> Hello The Net:
>
> For the same ferrite material, what is the difference in the performance
> between
> a binocular and a toroid form factor ?
>
> My preliminary thinking is that the same pri and sec turns will yield
> the same bandwidth and performance  on either.
>
> What is the wisdom and experience ?
>
> Stan, W1LE      Cape Cod     FN41sr
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