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JM
Guest

Sat Jan 07, 2017 10:56 pm   



I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?


Guest

Sat Jan 07, 2017 10:56 pm   



Butter cookie tins with 33 nF Russian feedthrough caps and SMA F-F bulkhead mount barrels.

I mostly use 70-mm film cans that I got from Surplus Shed.

Cheers

Phil Hobbs

nuny@bid.nes
Guest

Sat Jan 07, 2017 10:56 pm   



On Saturday, January 7, 2017 at 7:56:49 AM UTC-8, JM wrote:
Quote:
I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?


Friend of mine used a dead microwave oven. He had blocked off the input port and installed feedthroughs into the door. He left the light connected so he could watch for magic smoke through the door.


Mark L. Fergerson


Guest

Sun Jan 08, 2017 12:26 am   



Quote:
Butter cookie tins with 33 nF Russian feedthrough caps and
SMA F-F bulkhead mount barrels.


I used to do that as well. Blue cans and red cans with the Danish
mermaid on the lid. However, those are not good for the waist line
because someone has to "volunteer" and eat all the contents. I used
American feedthrough caps.


Well, you're doing your 5/8ths life crisis the hard way with a bike, whereas I'm doing mine the easy way with a convertible. ;)

Cheers

Phil Hobbs
(Who has also lost 30 lbs in the last few years)

John Larkin
Guest

Sun Jan 08, 2017 12:27 am   



On Sat, 07 Jan 2017 15:56:53 +0000, JM <dontreplytothis173_at_gmail.com>
wrote:

Quote:
I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?


What do you use them for?


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Jon Elson
Guest

Sun Jan 08, 2017 1:03 am   



JM wrote:

Quote:
I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?

They were most likely made BY Nokia. I'd go get them back from the
customers that stole them! They are probably worth serious money, perhaps
$1000 each, as they were hand made.

You COULD make them yourself. The only tricky part looks to be the front
bezel that the hinged cover mates to. Maybe they got this from somebody
that makes mil-spec fittings.

Jon


Guest

Sun Jan 08, 2017 1:57 am   



>You can make a nice box by soldering up slabs of FR4.

A common rookie mistake doing that is to use double-sided board and not solder to both sides of each piece--electrically you wind up with two L-shaped pieces facing each other, instead of a continuous shield.

Cheers

Phil "big fan of Cu tape" Hobbs

John Larkin
Guest

Sun Jan 08, 2017 2:23 am   



On Sat, 07 Jan 2017 12:03:33 -0600, Jon Elson <elson_at_pico-systems.com>
wrote:

Quote:
JM wrote:

I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?
They were most likely made BY Nokia. I'd go get them back from the
customers that stole them! They are probably worth serious money, perhaps
$1000 each, as they were hand made.

You COULD make them yourself. The only tricky part looks to be the front
bezel that the hinged cover mates to. Maybe they got this from somebody
that makes mil-spec fittings.

Jon


How about a metal tool box? Add some stick-on EMI finger stock at the
seams, if that matters.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

John Larkin
Guest

Sun Jan 08, 2017 3:18 am   



On Sat, 7 Jan 2017 12:14:54 -0800 (PST), "nuny_at_bid.nes"
<Alien8752_at_gmail.com> wrote:

Quote:
On Saturday, January 7, 2017 at 7:56:49 AM UTC-8, JM wrote:
I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?

Friend of mine used a dead microwave oven. He had blocked off the input port and installed feedthroughs into the door. He left the light connected so he could watch for magic smoke through the door.


Mark L. Fergerson


The door only shields well at the specific microwave frequency.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Joerg
Guest

Sun Jan 08, 2017 3:25 am   



On 2017-01-07 07:56, JM wrote:
Quote:
I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?


I use the redneck version. A huge thick cardboard box with lid, the kind
you could sit on and it wouldn't crush. An alternative would be a
plywood box. That is completely covered with thin copper stock. Wrapped
around the edges of the open box as well as the lid. There is a small
port hole on the side for cables, feedtroughs and stuff. I didn't need a
fan because the box is so large that it takes forever to heat up. Works.
A good test is to set a portable radio to a stron station, place it in
there and watch the audio going phhsssssss when the lid comes down.

An interesting effect when taking the lid off in winter is a serious
zzzap .. POP with an impressive blue ESD flash. Got to be careful. When
in doubt I have a resistor between lid and box. The nice thing is you
can solder to it anywhere.

--
Regards, Joerg

http://www.analogconsultants.com/

Joseph Gwinn
Guest

Sun Jan 08, 2017 3:29 am   



On Jan 7, 2017, JM wrote
(in article <o4r311$vu$1_at_dont-email.me>):

Quote:
I picked up a few of this type of Faraday cages at an auction (at a

Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Yeah. Send some bills for the purchase of those test cages, thanking them
profusely for the sale. The price is the replacement cost, not what you got
them for. I bet they’ll come back.

The Nokia boxes look to have been made in a real machine shop.


By the way, what I used back in the day were the large Bud or Hammond
die-cast seamless boxes, which are quite useful but not as large at the Nokia
boxes. It’s easy to drill or cut holes for connectors and the like. They
cost something like $50 each. If you needed to see inside, cut a large hole
and cover it with copper screening clamped to the metal with a steel ring and
some screws.

A size up from this are the metal chassis intended for building equipment to
go in 19” racks.


Joe Gwinn

Joerg
Guest

Sun Jan 08, 2017 3:31 am   



On 2017-01-07 08:20, pcdhobbs_at_gmail.com wrote:
Quote:
Butter cookie tins with 33 nF Russian feedthrough caps and SMA F-F bulkhead mount barrels.


I used to do that as well. Blue cans and red cans with the Danish
mermaid on the lid. However, those are not good for the waist line
because someone has to "volunteer" and eat all the contents. I used
American feedthrough caps.


Quote:
I mostly use 70-mm film cans that I got from Surplus Shed.


Real men use a Fosters can :-)

https://img1.etsystatic.com/055/1/5789651/il_570xN.760155877_4an7.jpg

Honey buckets also work well although my last one dared to rust through
after only 30 years.

--
Regards, Joerg

http://www.analogconsultants.com/

John Larkin
Guest

Sun Jan 08, 2017 4:26 am   



On Sat, 07 Jan 2017 12:31:34 -0800, Joerg <news_at_analogconsultants.com>
wrote:

Quote:
On 2017-01-07 08:20, pcdhobbs_at_gmail.com wrote:
Butter cookie tins with 33 nF Russian feedthrough caps and SMA F-F bulkhead mount barrels.


I used to do that as well. Blue cans and red cans with the Danish
mermaid on the lid. However, those are not good for the waist line
because someone has to "volunteer" and eat all the contents. I used
American feedthrough caps.


I mostly use 70-mm film cans that I got from Surplus Shed.


Real men use a Fosters can :-)

https://img1.etsystatic.com/055/1/5789651/il_570xN.760155877_4an7.jpg


I assume you dump the beer.

An Australian assured me that they make Fosters for export only, not
to drink themselves.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

John Larkin
Guest

Sun Jan 08, 2017 4:27 am   



On Sat, 07 Jan 2017 12:25:34 -0800, Joerg <news_at_analogconsultants.com>
wrote:

Quote:
On 2017-01-07 07:56, JM wrote:
I picked up a few of this type of Faraday cages at an auction (at a
Nokia facility) a few years ago for next to nothing :-

https://www.dropbox.com/s/6azvtcey6cjnfc5/FC1.JPG?dl=0
https://www.dropbox.com/s/c2tjx9aif4w1pjp/FC2.JPG?dl=0
https://www.dropbox.com/s/b78vv3851i7d0sc/FC3.JPG?dl=0

Unfortunately a couple have been (using the polite expression)
"borrowed" by customers, and I'm down to the last one. They are very
useful for testing of analogue prototypes, and I've been trying to find
a source who can supply similar units at reasonable cost.

Any pointers?


I use the redneck version. A huge thick cardboard box with lid, the kind
you could sit on and it wouldn't crush. An alternative would be a
plywood box. That is completely covered with thin copper stock. Wrapped
around the edges of the open box as well as the lid. There is a small
port hole on the side for cables, feedtroughs and stuff. I didn't need a
fan because the box is so large that it takes forever to heat up. Works.
A good test is to set a portable radio to a stron station, place it in
there and watch the audio going phhsssssss when the lid comes down.

An interesting effect when taking the lid off in winter is a serious
zzzap .. POP with an impressive blue ESD flash. Got to be careful. When
in doubt I have a resistor between lid and box. The nice thing is you
can solder to it anywhere.


You can make a nice box by soldering up slabs of FR4.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Tom Gardner
Guest

Sun Jan 08, 2017 6:13 am   



On 07/01/17 21:26, John Larkin wrote:
Quote:
On Sat, 07 Jan 2017 12:31:34 -0800, Joerg <news_at_analogconsultants.com
wrote:

On 2017-01-07 08:20, pcdhobbs_at_gmail.com wrote:
Butter cookie tins with 33 nF Russian feedthrough caps and SMA F-F bulkhead mount barrels.


I used to do that as well. Blue cans and red cans with the Danish
mermaid on the lid. However, those are not good for the waist line
because someone has to "volunteer" and eat all the contents. I used
American feedthrough caps.


I mostly use 70-mm film cans that I got from Surplus Shed.


Real men use a Fosters can :-)

https://img1.etsystatic.com/055/1/5789651/il_570xN.760155877_4an7.jpg


I assume you dump the beer.

An Australian assured me that they make Fosters for export only, not
to drink themselves.


People /drink/ Fosters?

Presumably they are the same people that (allegedly) drink Coors.

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