On 8/25/16 8:12 PM, Bill Metzenthen wrote:
On 26/08/16 08:14, Hal Murray wrote:
billm...@gmail.com said:
If the conductor also has magnetic properties (e.g. if iron were
used) then
magnetic saturation could be an issue.
Ah... Sorry I wasn't clear. How about
Is skin depth an interesting con
On 26/08/16 08:14, Hal Murray wrote:
billm...@gmail.com said:
If the conductor also has magnetic properties (e.g. if iron were used) then
magnetic saturation could be an issue.
Ah... Sorry I wasn't clear. How about
Is skin depth an interesting concept if you are using materials commonly use
Let's know if they get to the bottom of this, Magnus- its interesting to
speculate on the cause but hopefully they figure out the real issue.
DaveB, NZ
- Original Message -
From: "Magnus Danielson"
To: "Discussion of precise time and frequency measurement"
Cc:
Sent: Wednesday, Augu
to shield against DC and low frequency magnetic field usually high
permeability magnetizable material -- Permalloy, Mu-metal or similar is
used, the field concentrates in the high permeability material and
"behind it" is no left over magnetic field
73
Alex
On 8/25/2016 11:10 AM, Magnus Dani
billm...@gmail.com said:
> If the conductor also has magnetic properties (e.g. if iron were used) then
> magnetic saturation could be an issue.
Ah... Sorry I wasn't clear. How about
Is skin depth an interesting concept if you are using materials commonly used
for magnetic shielding, for exa
On 26/08/16 06:33, Hal Murray wrote:
billm...@gmail.com said:
Skin depth is probably a good place to start with in roughly estimating the
thickness needed. In copper at 50 Hz, ...
Is skin depth an appropriate concept for magnetic shielding? Or does it get
messed up by saturation?
Skin dep
Hi,
Sorry for this late response but I was away from home.
I did the 1 PPS mod a year ago. I just cut the trace between TP14 and
U405 pin 6 and soldered a wire between TP14 and TP33.
Now you have 1PPS on the former 9.8304 MHz output. Not being a cellular
tower operator I did not have any use fo
billm...@gmail.com said:
> Skin depth is probably a good place to start with in roughly estimating the
> thickness needed. In copper at 50 Hz, ...
Is skin depth an appropriate concept for magnetic shielding? Or does it get
messed up by saturation?
--
These are my opinions. I hate spam.
Hi,
On 08/25/2016 11:04 AM, Bill Metzenthen wrote:
On 25/08/16 18:25, Poul-Henning Kamp wrote:
In message
<1057836989.2088307.1472104857885.javamail.ya...@mail.yahoo.com>, Br
uce Griffiths writes:
You'd need a rather thick copper jacket to shield effectively
against the 50Hz magnetic
On 25/08/16 18:25, Poul-Henning Kamp wrote:
In message <1057836989.2088307.1472104857885.javamail.ya...@mail.yahoo.com>, Br
uce Griffiths writes:
You'd need a rather thick copper jacket to shield effectively
against the 50Hz magnetic field.
As in: A good-sized fraction of the waveleng
Hi
There is also the minor issue of putting the (very thick) layers on in a spiral
around the "core". You put one layer on clockwise and the next counter
clockwise. Since the materials are quite springy, controlling the whole process
through heat treating is a real chore.
Bob
> On Aug 25, 201
Bruce wrote:
As long as you don't saturate it, bend it, hit it or drop it.
And that is AFTER you form it to shape and then anneal it in a Hydrogen
atmosphere.
You may (probably would) need several layers, perhaps of different
high-permeability alloys, with a thick outermost layer of soft i
In message <1057836989.2088307.1472104857885.javamail.ya...@mail.yahoo.com>, Br
uce Griffiths writes:
>You'd need a rather thick copper jacket to shield effectively
>against the 50Hz magnetic field.
As in: A good-sized fraction of the wavelength if I recall :-)
Electric fields are so mu
As long as you don't saturate it, bend it, hit it or drop it. Depending on the
ambient field a multilayer shield with outer layers of high saturation magnetic
material may be required.
Bruce
On Thursday, 25 August 2016 7:02 PM, David J Taylor
wrote:
From: Bruce Griffiths
You'd need
From: Bruce Griffiths
You'd need a rather thick copper jacket to shield effectively against the
50Hz magnetic field.
Bruce
==
Would mu-metal be any use?
https://en.wikipedia.org/wiki/Mu-metal
http://mumetal.co.uk/
Cheers,
David
--
SatSignal Software - Quality so
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