Message-ID: <8E8D23D235D70840B6582917DF27898006935BFB@temps153538.tms-ltd.com>
From: Reeves Paul <Paul.Reeves@uk.thalesgroup.com>
To: "'rsgb_lf_group@blacksheep.org'" <rsgb_lf_group@blacksheep.org>
Date: Thu, 29 Jan 2009 11:07:12 -0000
MIME-Version: 1.0
Subject: LF: RE: Ferrite toroid cores using HEM series materials
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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:john.rabson@wanadoo.fr]
Sent: 29 January 2009 10:43
To: rsgb_lf_group@blacksheep.org
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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