Trying to find out what Ferrite material this is.
 

I came across two ferrite toroids with the measurements of 35mm
diameter, the hole in the middle is 21mm and it is 13mm thick. On the
packet it says that the ferrite material is L15. Does anybody know if
L15 is equivalent to 43 or 61 ferrite material? I have searched the
net but have been unable to find any information. Any information
would be appreciated. Cheers.

Trying to find out what Ferrite material this is.
 

wrote:
I came across two ferrite toroids with the measurements of 35mm
diameter, the hole in the middle is 21mm and it is 13mm thick. On the
packet it says that the ferrite material is L15. Does anybody know if
L15 is equivalent to 43 or 61 ferrite material? I have searched the
net but have been unable to find any information. Any information
would be appreciated. Cheers.


Where did they come from? Sounds like it may have been from a kit.


Charlie.

--
M0WYM
www.radiowymsey.org

Trying to find out what Ferrite material this is.
 

wrote:
I came across two ferrite toroids with the measurements of 35mm
diameter, the hole in the middle is 21mm and it is 13mm thick. On the
packet it says that the ferrite material is L15. Does anybody know if
L15 is equivalent to 43 or 61 ferrite material? I have searched the
net but have been unable to find any information. Any information
would be appreciated. Cheers.


Here's how to check them:

http://www.w8pgw.org/node/303

Charlie.

--
M0WYM
www.radiowymsey.org

Trying to find out what Ferrite material this is.
 

I haven't got an antenna analyser to do the above checks. The toroids
came in a box of stuff from a hamfest. They are in a packet which has
the brand name "Duratech" printed on it.

Trying to find out what Ferrite material this is.
 

wrote:
I haven't got an antenna analyser to do the above checks. The toroids
came in a box of stuff from a hamfest. They are in a packet which has
the brand name "Duratech" printed on it.


If you have any means at all of mesuring
inductance, you can go he

http://en.wikipedia.org/wiki/Inductor
Inductor - Wikipedia, the free encyclopedia

Find the formula (#6) for the inductance
of a toroidal ring. Enter the
appropriate values and solve for u
(permeability of the core). Then look at
ferrites and iron power core properties
with the calculated permeability at the
test frequency. You'll probably find
several core materials that fit.

I think that's about all that can be done.

Chuck

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Trying to find out what Ferrite material this is.
 

On Fri, 01 Jun 2007 11:03:30 -0700, wrote:

I haven't got an antenna analyser to do the above checks.

Do you have a SWR meter?

73's
Richard Clark, KB7QHC

Trying to find out what Ferrite material this is.
 

Trying to find out what Ferrite material this is.
 

Owen Duffy wrote in
:

....
Search Jaycar's site for a LO1238. If that is what you have, you could
ask them for data.

I should have added that I think it is similar to the L8 material described
in their data sheets.

I have a vague recollection of measuring the inductance of a winding on the
material, and I think the ui was around 1500 which suggests it is low loss
up to a few hundred kHz, perhaps to 1MHz or so.

Owen

Trying to find out what Ferrite material this is.
 

Hello Owen,
I have tracked the product down to Jaycar but they don't know anything
about the material. The person I contacted was very vague and couldn't
steer me towards anybody that would know what material it was. All I
want to know is if the toroids would be any good for HF 1:1 baluns. I
have just made a balun using a FT-140-61 which is very close to the
same dimensions as the 2 toroids in the Duratech packet. If they can
be used they are a fair bit cheaper than sourcing FT-140-61 toroids.
In reply to Richard Clark, yes I do have a SWR meter.
Cheers
Max

Trying to find out what Ferrite material this is.
 

wrote:
All I
want to know is if the toroids would be any good for HF 1:1 baluns.

An antenna analyzer, like the MFJ-259B, is a very
useful piece of test equipment for all types of
measurements of this kind. Using the MFJ-259B, I
discovered that the Amidon brochure, "showing typical
'Z' in ohms for one turn at 25 MHz", is misleading.
Their "one turn" goes through the core twice which
I consider as being two turns. That's bad news for
w2du baluns.

If you could gain access to an MFJ-259B, you could
run the same kind of measurement on your toroids.
Heck, if you send one to me, I will run the experiment
and send it back to you.
--
73, Cecil http://www.w5dxp.com