Hi John,
Enclosed is the data from Maplin on these cores. Hope this is ok, not been
able to find any more data.
regards,
Paul Reeves G8GJA
Technical Specification
Order Part Max Max Min Attenuation (?)
Code: number: diameter (mm): length (mm): hole dia (mm): 25 MHz:
100MHz:
N88CU HEM3025 4.2 5.3 1.85 28 51
N97AB HEM3020 5.2 18.4 2 128 147
N98AB HEM3021 6.2 18.4 3 100 155
N48FK HEM3024 16.28 14.67 7.57 74 117
N92AB HEM3015 14.6 29.1 6.05 164 255
N91AB HEM3014 16.05 29.17 6.69 164 258
N87AB HEM3010 31.8 22.75 18.5 88 146
N90AB HEM3013 28.96 29.33 13.37 158 250
N88AB HEM3011 25.6 13.4 15.5 53 97
QT26D HEM3016 36.8 7.3 24.4 23 63
-----Original Message-----
From: John RABSON [mailto:[email protected]]
Sent: 29 January 2009 10:43
To: [email protected]
Subject: LF: Ferrite toroid cores using HEM series materials
Maplin have been selling these but their paper catalogue does not seem to
give detailed characteristics and doing an online search of their catalogue
is not practicable as I am typically getting 14.4kb/s on dialup*, which
means it takes a minute or more to repaint the page.
I tried e-mailing them but have not had a reply.
aL is easy to estimate with a few turns and an inductance meter, but I would
like to know more about these materials. Can anyone help, please?
John F5VLF
*we are promised ADSL in a few weeks but I have been here before
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