To: | [email protected] |
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Subject: | LF: Re: a lot of ferrite |
From: | Dimitrios Tsifakis <[email protected]> |
Date: | Sat, 12 Jan 2019 15:03:13 +1100 |
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Minor correction, the calculated relative permeability should be about 500, I made a mistake in the initial calculation. I just discover why they call it initial permeability (bad joke) :-) 73, Dimitris VK2COW Στις Σάβ, 12 Ιαν 2019 στις 2:48 μ.μ., ο/η Dimitrios Tsifakis <[email protected]> έγραψε: > > Hi LF group, > > I have managed to acquire a few very large ferrite rods (36 cm x 10 cm > x 2 cm). The material is unknown but I managed to form a square > 'toroid' with four of them (they are heavy so gravity was enough to > keep everything in place for a measurement) and I measured about 15 uH > for 4 turns at 0.1 MHz, which if I have done the calculations > correctly implies a relative permeability of about 1000. > > The R of the impedance of the square loop was low (<0.2 ohm) at 0.1 > MHz and it increased fast with frequency (170 ohm at 5 MHz!). > > The question is, what LF/VLF experiment would you do if you had half a > dozen of these rods? > > 73, Dimitris VK2COW |
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