Stainless steel stock pot...

[Mike Monett]

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

> Mike Monett wrote:

[...]

Let me know how much it costs so I can send you the money.

Nah, no worries--it\'s very short money. We techies have to stick
together. I\'ll send it Monday.

Cheers

Phil Hobbs

That\'s great news. Thanks Very Much!



--
MRM

 

[legg]

On Fri, 15 Jul 2022 17:28:55 -0000 (UTC), Mike Monett <spamme@not.com>
wrote:

I wonder if a stainless steel stock pot woulr be a useful RFI shield for
low level measurements, such as phase noise measurements.

The pot is available on Amazon and is the cheapest and largest I could
find. Here is the data. A picture is in the link:

Imusa Stainless Steel Stock Pot, 20 Quart

$46.77 FREE delivery July 17 - 18

Material : Stainless Steel
Colour : Silver
Capacity : 18.93 liters
Item dimensions : 37.5 x 28 cm : 37/2.54 = 14.5\" X 11\"

https://www.amazon.ca/Imusa-Stainless-Steel-Stock-Quart/dp/B0018EAMKA/

I am mainly interested in frequencies around 100 MHz. The lid is loose
fitting, but I could get some RF gasketing to make better contact.

The rf source is a local transmitter that obliterates all measurements.

Thanks for any help.

Mike

For anything that had to leave the lab without a red face,
I\'ve resorted to surplus steel ammo boxes. The contacting
surfaces can be ground and there\'s plenty of force-fit area
in the hermetic gasket to include em-compatible material.

RL

 

[server]

jlarkin@highlandsniptechnology.com wrote in
news:isi5dh90k2s11p9b68ppec1psmkiqeso58@4ax.com:

On Fri, 15 Jul 2022 20:42:45 -0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote in
news:ahi3dhllsmv72phkvg9332d659eof1bnph@4ax.com:

On Fri, 15 Jul 2022 17:28:55 -0000 (UTC), Mike Monett
spamme@not.com> wrote:

I wonder if a stainless steel stock pot woulr be a useful RFI
shield for low level measurements, such as phase noise
measurements.

The pot is available on Amazon and is the cheapest and largest I
could find. Here is the data. A picture is in the link:

Imusa Stainless Steel Stock Pot, 20 Quart

$46.77 FREE delivery July 17 - 18

Material : Stainless Steel
Colour : Silver
Capacity : 18.93 liters
Item dimensions : 37.5 x 28 cm : 37/2.54 = 14.5\" X 11\"

https://www.amazon.ca/Imusa-Stainless-Steel-Stock-Quart/dp/B0018E
AM KA/

I am mainly interested in frequencies around 100 MHz. The lid is
loose fitting, but I could get some RF gasketing to make better
contact.

The rf source is a local transmitter that obliterates all
measurements.

Thanks for any help.

Mike

Yes, but not any help for magnetic fields.

You could seal the lid fairly well with a wide strip of copper
or aluminum tape, like the stuff sold at Lowes.

And use it to make chicken broth. No canned junk approaches good
home-made broth.

Too bad it won\'t solder, but you can install SMA or BNC
connectors.

https://www.dropbox.com/s/2uoeruouhcoz6al/Z482_Can.jpg?raw=1

https://www.dropbox.com/s/30c6aesh4tzjg56/Z496_Can.jpg?raw=1

He could line out the pot with 2 inch wide strips of Mu metal.
Even transformer lamination media would work.

It\'s really hard to shield a substantial volume from low frequency
mag fields.

You spelled \"impossible\" wrong. Instead of \"None shall pass\", it
is \"All shall pass\"... The trick is diversion.

A chunky steel Hoffman box is basically transparent.
Mumetal foil is useless.

Thick copper eddy-current shielding sort of works, but that ss pot
won\'t do much.

I made a ground penetrating radio once... it was a very low
frequency, and a very low \'baud rate\'.

It can pass through planets (fields)... I think a little steel pot
wont stop it either. Redirection or diversion is the key to
obtaining an attenuated level of influence.

 

[Fred Bloggs]

On Friday, July 15, 2022 at 1:29:02 PM UTC-4, Mike Monett wrote:

I wonder if a stainless steel stock pot woulr be a useful RFI shield for
low level measurements, such as phase noise measurements.

The pot is available on Amazon and is the cheapest and largest I could
find. Here is the data. A picture is in the link:

Imusa Stainless Steel Stock Pot, 20 Quart

$46.77 FREE delivery July 17 - 18

Material : Stainless Steel
Colour : Silver
Capacity : 18.93 liters
Item dimensions : 37.5 x 28 cm : 37/2.54 = 14.5\" X 11\"

https://www.amazon.ca/Imusa-Stainless-Steel-Stock-Quart/dp/B0018EAMKA/

I am mainly interested in frequencies around 100 MHz. The lid is loose
fitting, but I could get some RF gasketing to make better contact.

The rf source is a local transmitter that obliterates all measurements.

Thanks for any help.

You can get a 6-gallon galvanized steel garbage can with lid for under $20 (Behrens). You\'re going to need a gasket whichever type you use.
You can spiral wrap some weather stripping with this for the lid gasket- about 45 inches.
https://www.amazon.com/ANGKEEL-Conductive-Grounding-Interference-Electrical/dp/B097HPSLTH/ref=sr_1_3

Mike


--
MRM

 

[Mike Monett]

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

[...]

If your gizmo will fit, gallon paint cans are a lot cheaper and have
really excellent RF sealing.

Cheers

Phil Hobbs

Superb suggestion. A paint can from Home Depot will fit inside the stock
pot:

BEAUTITONE Empty Paint Can - with Lid & Handle, 4 L

6.50\" Dia, 7.70\" High

$7.99 /EA + shipping $13.15

https://www.homehardware.ca/en/4l-empty-paint-can-with-lid-and-
handle/p/1610806

This will give double shielding, like the old Marconi signal generators. It
will certainly help solve the problem of coax leakage for some of the
signals.

Thanks,

Mike


--
MRM