Re: Working with shorter (and cheaper) ferrites - The Backpack FSL
Thanks for your detailed consideration of this, Kevin.toggle quoted messageShow quoted text
It confirms what I half-assumed, but wasnt sure of.
I hadnt thought of the opposing "grain" of ferrite rings
as compared to rods or bars, which may well be
Early on in the FSL discussion, we briefly mentioned
the coil-diameter issue and the assumed simplified
underlying principle that the ferrite allows the loop
to be reduced in size for similar performance. It would
be interesting to experiment with a, say, 12inch loop
and different arrays of "lumped" ferrite inside, which would
doubtless be inferior to the best FSL designs, but might
give additional insight into viable variants.
Is Chinese ferrite available? Quality? Price?
----- Original Message --------------------------------------------------------
From: "dhsatyadhana" <dhsatyadhana@...>
Sent: 29 October 2011 18:47
Subject: [ultralightdx] Re: Working with shorter (and cheaper) ferrites - The Backpack FSL
I forgot to mention, in response to your other question: Steve R.'s experiments showed that ferrite
length doesn't add sensitivity, but only adds to the inductance. So, wrapping a couple more turns
around shorter ferrites would give the same inductance, and at least equal performance. As long as
you don't run out of space to wind the coil, the shorter ferrites appear to provide the same result.
This matched what Graham reported in his theory discussion.
--- In ultralightdx@..., "Michael" <michael.setaazul@...> wrote:
(FSL) antennas using shorter ferrites, seeing if smaller and cheaper FSLs are possible. Graham's