• Stainless steel stock pot

    From Mike Monett@21:1/5 to All on Fri Jul 15 17:28:55 2022
    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


    --
    MRM

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From a a@21:1/5 to Mike Monett on Fri Jul 15 10:46:27 2022
    On Friday, 15 July 2022 at 19:29:02 UTC+2, 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.

    Mike


    --
    MRM
    expensive

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to Mike Monett on Fri Jul 15 14:06:48 2022
    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.

    Mike



    If you can get good sealing on the lid, and get signals in and out.

    Something like bulkhead-mount BNC F-F adapters for RF, and some
    feedthrough caps for slower stuff.

    I have a thousand or so Soviet 10 nF feedthroughs that I got on eBay
    long ago--since I haven't sent your scintillator yet, I'll toss a
    handful into the box.

    Cheers

    Phil Hobbs

    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From whit3rd@21:1/5 to Mike Monett on Fri Jul 15 12:02:45 2022
    On Friday, July 15, 2022 at 10:29:02 AM UTC-7, 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.

    Plain old soft tin-plate steel cans, like popcorn treats and saltines come in, are good; any decent HVAC shop can bend up a galvanized box for you, and
    at 100 MHz the seams shouldn't be a major problem. A big stock pot
    is intermediate-sized by comparison. If you can put battery power inside
    the box, and avoid DC/DC converters or clocked logic, that's a win.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From DecadentLinuxUserNumeroUno@decadenc@21:1/5 to whit3rd@gmail.com on Fri Jul 15 20:39:59 2022
    whit3rd <whit3rd@gmail.com> wrote in news:859ca810-27c1-47c5-9dad-76d605fb8554n@googlegroups.com:

    On Friday, July 15, 2022 at 10:29:02 AM UTC-7, 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.

    Plain old soft tin-plate steel cans, like popcorn treats and
    saltines come in, are good; any decent HVAC shop can bend up a
    galvanized box for you, and at 100 MHz the seams shouldn't be a
    major problem. A big stock pot is intermediate-sized by
    comparison. If you can put battery power inside the box, and
    avoid DC/DC converters or clocked logic, that's a win.


    Without any rf gasketing between the pot and the removeable lid, you
    may want to buy a roll of copper tape to seal it up with. Tape it up
    after closure remove after testing.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From DecadentLinuxUserNumeroUno@decadenc@21:1/5 to John Larkin on Fri Jul 15 20:42:45 2022
    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/B0018EAM
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to All on Fri Jul 15 13:20:08 2022
    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

    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Mike Monett@21:1/5 to whit3rd@gmail.com on Fri Jul 15 21:06:06 2022
    whit3rd <whit3rd@gmail.com> wrote:

    On Friday, July 15, 2022 at 10:29:02 AM UTC-7, 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.

    Plain old soft tin-plate steel cans, like popcorn treats and saltines
    come in, are good; any decent HVAC shop can bend up a galvanized box for
    you, and at 100 MHz the seams shouldn't be a major problem. A big
    stock pot is intermediate-sized by comparison. If you can put battery
    power inside the box, and avoid DC/DC converters or clocked logic,
    that's a win.

    Thanks for the info. There will be some noisy things inside the pot, but it's the outside interference that will be difficult. There's a FM station not far away that obliterates all measurements.



    --
    MRM

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Mike Monett@21:1/5 to Phil Hobbs on Fri Jul 15 21:01:17 2022
    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    If you can get good sealing on the lid, and get signals in and out.

    Something like bulkhead-mount BNC F-F adapters for RF, and some
    feedthrough caps for slower stuff.

    I have a thousand or so Soviet 10 nF feedthroughs that I got on eBay
    long ago--since I haven't sent your scintillator yet, I'll toss a
    handful into the box.

    Cheers

    Phil Hobbs

    Thanks for the reply.

    Amazon reviewers complain the lid is warped, but it could probably be straightened. Maybe a weight on the lid might help, and some RF gasketing.

    I was planning on BNC's, but the shielding on RG-58 is not very good:

    "The state-of-the-art for RF leakage of flexible cables is given as
    nominally 40 dBc for a single round wire braid, RG-8 and RG-58, and 60
    dBc for double braid outer conductors", from

    https://www.microwavejournal.com/articles/6007-improving-shielding- effectiveness-of-flexible-coaxial-cables

    From previous experience, the first 90% is easy. It's the last 10% that
    drives you nuts. So with a FM station blasting rock on your doorstep, I
    expect a serious fight.

    Thanks for the news on the scintillator. I have some good information on getting it up and running that I will put in a separate post. I know
    everyone is just dying to learn how much radon gas is in their basement.

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

    Thanks,

    Mike



    --
    MRM

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Lasse Langwadt Christensen@21:1/5 to All on Fri Jul 15 14:21:28 2022
    fredag den 15. juli 2022 kl. 22.20.18 UTC+2 skrev John Larkin:
    On Fri, 15 Jul 2022 17:28:55 -0000 (UTC), Mike Monett <spa...@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
    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

    with a more aggressive fluss stainless solder easily with a normal soldering iron and solder

    but it is probably not easy to something as substantial as a pot hot enough without melting the connector

    much easier to get some of these:

    https://www.amazon.com/outstanding-SMA-Female-Waterproof-Bulkhead-Connector/dp/B07BXZ2NDV

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jasen Betts@21:1/5 to Mike Monett on Sat Jul 16 01:57:27 2022
    On 2022-07-15, 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.

    Is there a reason why you're not considering paint cans?

    --
    Jasen.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From whit3rd@21:1/5 to DecadentLinux...@decadence.org on Fri Jul 15 20:41:13 2022
    On Friday, July 15, 2022 at 1:40:07 PM UTC-7, DecadentLinux...@decadence.org wrote:
    whit3rd <whi...@gmail.com> wrote in news:859ca810-27c1-47c5...@googlegroups.com:
    On Friday, July 15, 2022 at 10:29:02 AM UTC-7, 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.


    Plain old soft tin-plate steel cans, like popcorn treats and
    saltines come in, are good; any decent HVAC shop can bend up a
    galvanized box for you, and at 100 MHz the seams shouldn't be a
    major problem. A big stock pot is intermediate-sized by
    comparison. If you can put battery power inside the box, and
    avoid DC/DC converters or clocked logic, that's a win.

    Without any rf gasketing between the pot and the removeable lid, you
    may want to buy a roll of copper tape to seal it up with. Tape it up
    after closure remove after testing.

    Or, have the lid brazed into its seat; build a bolt-able flange door into the flat kettle bottom, if easy entry
    is required. A domed lid wouldn't be easy to seal. I wonder if a salt-water bath containing
    the lid would be good enough conductivity, just drop the kettle on top of that... quick and dirty.

    There once was a reciprocating mechanism to be fitted to a motor, that we just terminated in
    a brass cup. The motor got a brass ball, and we soft-soldered 'em to connect (and disconnected
    with a torch). We liked rigidity with minimal moving mass.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Mike Monett@21:1/5 to Lasse Langwadt Christensen on Sat Jul 16 04:37:51 2022
    Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

    [...]

    with a more aggressive fluss stainless solder easily with a normal
    soldering iron and solder

    but it is probably not easy to something as substantial as a pot hot
    enough without melting the connector

    much easier to get some of these:

    https://www.amazon.com/outstanding-SMA-Female-Waterproof-Bulkhead-Connect or/dp/B07BXZ2NDV

    Thanks for the link on SMA.

    The problem with RG-58 is it only gives 40-60dB of attenuation to leakage:

    https://www.microwavejournal.com/articles/6007-improving-shielding- effectiveness-of-flexible-coaxial-cables

    There are a few manufacturers of coax with foil plus braid shield. It's not expensive. I'll get some and try it:

    https://www.pimfg.com/product-detail/RG-58-U https://www.summitsource.com/RG-58-Dual-Shielded-C646.aspx https://www.tessco.com/product/rg58-size-coaxial-cable-10849

    Thanks,

    Mike




    --
    MRM

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Mike Monett@21:1/5 to whit3rd@gmail.com on Sat Jul 16 04:42:05 2022
    whit3rd <whit3rd@gmail.com> wrote:

    [...]

    Or, have the lid brazed into its seat; build a bolt-able flange door
    into the flat kettle bottom, if easy entry is required. A domed lid
    wouldn't be easy to seal. I wonder if a salt-water bath containing
    the lid would be good enough conductivity, just drop the kettle on top
    of that... quick and dirty.

    Thanks for the idea. There's plenty of RF gasket available.




    --
    MRM

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to DecadentLinuxUserNumeroUno@decadenc on Sat Jul 16 07:34:15 2022
    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/B0018EAM
    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. 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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to langwadt@fonz.dk on Sat Jul 16 07:36:12 2022
    On Fri, 15 Jul 2022 14:21:28 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

    fredag den 15. juli 2022 kl. 22.20.18 UTC+2 skrev John Larkin:
    On Fri, 15 Jul 2022 17:28:55 -0000 (UTC), Mike Monett <spa...@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
    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

    with a more aggressive fluss stainless solder easily with a normal soldering iron and solder

    but it is probably not easy to something as substantial as a pot hot enough without melting the connector

    much easier to get some of these:

    https://www.amazon.com/outstanding-SMA-Female-Waterproof-Bulkhead-Connector/dp/B07BXZ2NDV

    Those are cool. You can screw an SMA lowpass filter or attenuator on
    one side for better isolation.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to All on Sat Jul 16 07:38:29 2022
    On Sat, 16 Jul 2022 04:37:51 -0000 (UTC), Mike Monett <spamme@not.com>
    wrote:

    Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

    [...]

    with a more aggressive fluss stainless solder easily with a normal
    soldering iron and solder

    but it is probably not easy to something as substantial as a pot hot
    enough without melting the connector

    much easier to get some of these:

    https://www.amazon.com/outstanding-SMA-Female-Waterproof-Bulkhead-Connect
    or/dp/B07BXZ2NDV

    Thanks for the link on SMA.

    The problem with RG-58 is it only gives 40-60dB of attenuation to leakage:

    https://www.microwavejournal.com/articles/6007-improving-shielding- >effectiveness-of-flexible-coaxial-cables

    There are a few manufacturers of coax with foil plus braid shield. It's not >expensive. I'll get some and try it:

    https://www.pimfg.com/product-detail/RG-58-U >https://www.summitsource.com/RG-58-Dual-Shielded-C646.aspx >https://www.tessco.com/product/rg58-size-coaxial-cable-10849

    Thanks,

    Mike


    Tinned braid coax, semi-hardline, is great. ebay has assortments,
    probably pulled from old RF gear or leftover custom stuff.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to usenet@revmaps.no-ip.org on Sat Jul 16 07:39:45 2022
    On Sat, 16 Jul 2022 01:57:27 -0000 (UTC), Jasen Betts <usenet@revmaps.no-ip.org> wrote:

    On 2022-07-15, 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.

    Is there a reason why you're not considering paint cans?

    Danish butter cookies and chocolates taste better than paint.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to John Larkin on Sat Jul 16 21:12:15 2022
    John Larkin wrote:
    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

    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

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

    Cheers

    Phil Hobbs

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  • From Phil Hobbs@21:1/5 to Mike Monett on Sat Jul 16 21:13:44 2022
    Mike Monett wrote:
    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    If you can get good sealing on the lid, and get signals in and out.

    Something like bulkhead-mount BNC F-F adapters for RF, and some
    feedthrough caps for slower stuff.

    I have a thousand or so Soviet 10 nF feedthroughs that I got on eBay
    long ago--since I haven't sent your scintillator yet, I'll toss a
    handful into the box.

    Cheers

    Phil Hobbs

    Thanks for the reply.

    Amazon reviewers complain the lid is warped, but it could probably be straightened. Maybe a weight on the lid might help, and some RF gasketing.

    I was planning on BNC's, but the shielding on RG-58 is not very good:

    "The state-of-the-art for RF leakage of flexible cables is given as
    nominally –40 dBc for a single round wire braid, RG-8 and RG-58, and –60 dBc for double braid outer conductors", from

    https://www.microwavejournal.com/articles/6007-improving-shielding- effectiveness-of-flexible-coaxial-cables

    From previous experience, the first 90% is easy. It's the last 10% that drives you nuts. So with a FM station blasting rock on your doorstep, I expect a serious fight.

    Thanks for the news on the scintillator. I have some good information on getting it up and running that I will put in a separate post. I know
    everyone is just dying to learn how much radon gas is in their basement.

    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

    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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  • From Mike Monett@21:1/5 to Phil Hobbs on Sun Jul 17 09:22:26 2022
    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

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  • From legg@21:1/5 to All on Sun Jul 17 12:20:50 2022
    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

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  • From DecadentLinuxUserNumeroUno@decadenc@21:1/5 to jlarkin@highlandsniptechnology.com on Sun Jul 17 22:49:34 2022
    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.

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  • From Fred Bloggs@21:1/5 to Mike Monett on Sun Jul 17 17:06:46 2022
    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

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  • From Mike Monett@21:1/5 to Phil Hobbs on Mon Jul 18 08:04:03 2022
    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

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