Should I be using 10 Ohm here?
-Original Message-
From: Wan Juang Foo [mailto:f...@np.edu.sg]
Sent: Friday, October 11, 2002 8:29 PM
To: Dan Pierce; emc-p...@majordomo.ieee.org
Subject: Re: Ferrites for GND
Dan,
It is a lossy material and most commercially available ferrite beads are
Dan,
It is a lossy material and most commercially available ferrite beads are
'tuned' to peak around the 100 MHz (VHF band II ?). I suppose there must
be lots of exception but I have not use any outside this region. Most of
them have different Q to describe their individual characteristics.
Ob
Hi Dan.
Two ferrite manufacturers I use are Stewart and Fair-Rite. Both of
them have catalogs containing great detail graphs of performance of
their various materials.
Some of the 43 and 44 ferrite materials have very good low frequency
performance. I would suggest, because I have no furt
Electronics
( After sale)
- Original Message -
From:
To:
Sent: Wednesday, March 14, 2001 5:22 PM
Subject: Re: Ferrites experience ... last comment
>
> Hi all,
>
> Many thanks to all of you who participated in this ferrite discusson. I
have
> leard a lot about ferrites t
Hi all,
Many thanks to all of you who participated in this ferrite discusson. I have
leard a lot about ferrites the last 10 days.
In my special case, I would like to give you some information:
We had a problem with conducted emisson on the DC supply line to a telecom
product. The harmonic swi
Sent: Thursday, December 02, 1999 5:39 PM
> To: Price, Ed; d...@dsmith.org
> Cc: emc-pstc
> Subject: Re: Ferrites can increase emissions?
>
> In such a case did you place a ferrite device at both ends of the cable?
> It
> has worked for me.
> Ralph
>
> - Or
Hi Doug:
I would agree with you technically and your intent.
Ralph
- Original Message -
From: Doug Smith
To: Ralph Cameron ;
Cc: emc-pstc
Sent: Thursday, December 02, 1999 2:35 PM
Subject: Re: Ferrites can increase emissions?
> Hi Ralph,
>
> I don't advocate placing
In such a case did you place a ferrite device at both ends of the cable? It
has worked for me.
Ralph
- Original Message -
From: Price, Ed
To: 'Ralph Cameron' ;
Cc: emc-pstc
Sent: Thursday, December 02, 1999 12:29 PM
Subject: RE: Ferrites can increase emissions?
> I
ors remotely from the source of
>the emissions?
>
>Ralph
>
>- Original Message -
>From: Douglas C. Smith
>To: Ralph Cameron
>Cc: emc-pstc
>Sent: Thursday, December 02, 1999 8:43 AM
>Subject: Re: Ferrites can increase emissions?
>
>
>> Hi Ral
f the
combined noise currents in the cable. The location of the choke affects the
size of the loops oppositely.
Ed
> -Original Message-
> From: Ralph Cameron [SMTP:ral...@igs.net]
> Sent: Thursday, December 02, 1999 12:10 PM
> To: d...@dsmith.org
> Cc: emc-pstc
> Sub
placing it on conductors remotely from the source of
the emissions?
Ralph
- Original Message -
From: Douglas C. Smith
To: Ralph Cameron
Cc: emc-pstc
Sent: Thursday, December 02, 1999 8:43 AM
Subject: Re: Ferrites can increase emissions?
> Hi Ralph and all,
>
> Please define
Hi Ralph and all,
Please define "ground loop" in your reply below. Normally, the term
ground loop only has meaning at low frequencies (60 Hz and DC). At
high frequencies an infinite number of loops exist and they do not
require a conductor to complete them. You need to define exactly the
effect f
The purpose of a common mode choke whether it be of ferrite or powdered iron
is to isolate the connecting conductors from the rest of the mainboard or
chassis. If the toridal core is correctly placed as close to the source of
the emissions i.e. the PCB, the conductors which carry the emitted noi
Hi,
If you are driving lines with fast rise times then you will still only
get external currents if the shield of the coax is leaky or if the
termination is not properly matched over the entire spectrum of the data
bandwidth. If the ferrite is lossy and spaced closely enough compared
to the shor
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