In message A4D6324D0FB34C44B981F580DB1652F2@pc52, Tom Van Baak writes:
What I did instead was to buy a bunch of cement paving blocks
from Home Depot and made an air-tight sarcophagus (Egypt or
Chernobyl-style). Lots of thermal mass.
My personal best was an old fridge, and if you _really_ want
How about using Hostess Twinkies? They look like they would have good
insulating properties and are well known to never, ever decompose ;-)
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to mount things on
it if needed and with a minimum number of seams.
It may be more work than cutting sheets of styrofoam though.
Didier KO4BB
--Original Message--
From: John Ackermann N8UR
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: [time-nuts] Thermal
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so the oven loop has time to react gracefully.
I'm thinking of something in sheet
In message 4f074dd9.5070...@febo.com, John Ackermann N8UR writes:
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so the oven loop
I just did this search for similar application. The cheapest stuff
they have is expanded polystyrene bead sheet which is easy enough to
work with but may be too thick (3/4) or not as durable as you want. I
made a hot wire cutting element for my Weller soldering gun out of a
length of 10 gauge
I've used Reflectix duct insulation in applications like this. it's
essentially bubble wrap with a reflective layer, you can layer it
pretty easily to add/subtract from the insulation value. plus is comes
in small, cheap rolls
here is a link to the amazon item, but it's in most hardware stores
They sell 4x8 foot sheets of aluminum foil faced foam insulation at
Home Depot. The thinnest is maybe just under one inch. Thickest is
about 4 thick. The other thing is just to make the cabinet out of
wood rather then sheet metal. Finally in stores that sell camping
equipment you can get roll
In message cabqdsz-hohh8ehspfm0aa6iw-ar6dljt2uxvxqhbtqtmwyk...@mail.gmail.com
, Eric Garner writes:
I've used Reflectix duct insulation in applications like this. it's
essentially bubble wrap with a reflective layer, you can layer it
pretty easily to add/subtract from the insulation value. plus
Hi John:
Michaels has Styrofoam, hot wire cutter and glue.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html
John Ackermann N8UR wrote:
I am looking for a readily available (from Home Depot or other local source) insulating material to use
: John Ackermann N8UR
Sender: time-nuts-boun...@febo.com
To: Discussion of precise time and frequency measurement
ReplyTo: Discussion of precise time and frequency measurement
Subject: [time-nuts] Thermal insulation choice?
Sent: Jan 6, 2012 11:39 AM
I am looking for a readily available (from Home
There is a closed-cell foam, aluminum foil clad on one or both sides that
is used as HVAC ductwork - they score it with a knife, and fold it to size
- that should withstand the temperatures you are contemplating, for a long
time. I have seen some approximately 1/2 to 5/8 inch, and the quantities
I mostly like it because it's easy to use, and _doesn't_ insulate too
well. you can add/subtract what you like to find the performance you
are happy with.
it also has the advantage that it doesn't degrade into garbage like
some closed cell foams do, and is really easy to work with
-Eric
On Fri,
That stuff at Home Depot is the way to go. You can use regular
styrofoam from coolers and cold shipping boxes, but there are a lot
of grades, ranging from crappy to great, and some are even
biodegradable - not good for this application. The construction types
are made to last, but also may
In message 201201062016.q06kg3vj016...@mail32c40.carrierzone.com, ed breya wr
ites:
That stuff at Home Depot is the way to go. You can use regular
styrofoam [...]
Just remember that clean styrofoam is great at static electricity...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
:39 PM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Thermal insulation choice?
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a sensitive
OCXO. My goal is just
John:
The solution that will last longer than you will, is alternating
layers of aluminum foil (kitchen variety) and (dry) fiberglass cloth
(sold as roven woven anywhere they sell fiberglass supplies,
looks like white cloth, you can cut with scissors.)
Good to cryogenic temperatures, no
Yes - especially don't rub any cats on it or it may damage some electronics.
BTW for machining, any fine-toothed saw blade works well for straight
cuts. A metal hacksaw blade is usually stiff enough by itself to make
accurate, clean finish cuts on quality styrofoam. For drilling
round holes
On 1/6/2012 2:54 PM, Chris Albertson wrote:
Can you put something that uses power inside an insulated box? I'd
think it might over heat.
Thanks, all, for the numerous and helpful responses!
To answer Chris' question, putting insulation all the way around the
oscillator might cause problems
I wonder if Balsa wood would be suitable? Like polystyrene foam,
only stronger and easy to glue.
I think commercial OXCOs use polystyrene foam that's expanded to
shape, which is fine in production, but making the mold for one use
is not efficient. However, there are lots of expand-in-place
--
From: John Ackermann N8UR j...@febo.com
Sent: Friday, January 06, 2012 2:39 PM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Thermal insulation choice?
I am looking for a readily available (from Home Depot or other local
source) insulating
John Ackermann N8UR wrote:
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so the oven loop has time to react gracefully.
Before
On 1/6/2012 4:14 PM, Rick Karlquist wrote:
Before making this into a science project, consider this data
point: We converted the oscillator in a 10811 to run in mode
B at 10.95 MHz. The tempco in mode B is about 30 ppm per degree
C. Needless to say, the converted 10811 was extremely
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Thermal insulation choice?
John:
The solution that will last longer than you will, is alternating
layers of aluminum foil (kitchen variety) and (dry) fiberglass cloth
(sold as roven woven
On Fri, 06 Jan 2012 16:33:19 -0500, John Ackermann N8UR j...@febo.com
wrote:
On 1/6/2012 4:14 PM, Rick Karlquist wrote:
Before making this into a science project, consider this data
point: We converted the oscillator in a 10811 to run in mode
B at 10.95 MHz. The tempco in mode B is about 30
Subject: Re: [time-nuts] Thermal insulation choice?
John Ackermann N8UR wrote:
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so the oven loop has time to react gracefully.
Hi John,
Once I used several inch
On 1/6/12 11:39 AM, John Ackermann N8UR wrote:
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so the oven loop has time to react
My goal is just to slow down any external thermal
transients so the oven loop has time to react gracefully.
Are you sure it is not thermal mass that needs to be increased and
not just insulation?
Phil
___
time-nuts mailing list --
I'm planning to do it a little different. I'll mount the FE5680 on a
heat sink and put that inside a metal box. The I drill a hole in the
center of the heat sink and epoxy in a temperature sensor. These
produce a voltage proportional to temperature and will control a small
fan. The moving air
Bob Camp wrote:
Hi
A metal shell inside a metal shell pretty well takes care of everything.
Gradients, transients, drafts, what ever. You don't need super thick
stuff.
Bud chassis, Hammond boxes, copper pipe, PC board material, or soldered
brass flashing all will do the trick.
We also
Rick,
On 01/06/2012 10:14 PM, Rick Karlquist wrote:
John Ackermann N8UR wrote:
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so
Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] Thermal insulation choice?
To: time-nuts@febo.com
Received: Friday, January 6, 2012, 6:10 PM
Rick,
On 01/06/2012 10:14 PM, Rick Karlquist wrote:
John Ackermann N8UR wrote:
I am looking for a readily available (from Home
Depot
At 10:15 PM + 1/6/12, time-nuts-requ...@febo.com wrote:
Date: Fri, 06 Jan 2012 14:41:13 -0600
From: David davidwh...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Thermal insulation choice?
Message-ID
John Ackermann N8UR wrote:
I am looking for a readily available (from Home Depot or other local
source) insulating material to use in a chassis that's housing a
sensitive OCXO. My goal is just to slow down any external thermal
transients so the oven loop has time to react gracefully.
A
I would recommend and have used 1/4 inch polystyrene foam that is available in
roll form from DIY stores and either glue or double sided tape. It is easily
workable and cheap and achieves what you want. There is a caveat in that you
should also use nylon or other (heat) insulating washers and
2012 19:34:37
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Thermal insulation choice?
I would recommend and have used 1/4 inch polystyrene foam that is available in
roll form from DIY stores and either
: [time-nuts] Thermal insulation choice?
Message-ID: lrmeg7118lvondacu922olu8spb57je...@4ax.com
Content-Type: text/plain; charset=us-ascii
I completely forgot about those two. [Balsa wood and foam-in=place
urethane foam]
I have a good local hobby shop
with large pieces of balsa wood but I
Insulation of an object to reduce heat transfer has three main
components.
Convection, the movement of air which carries heat from place to
place, this is easily reduced by
small cell (less than 5mm) structures, below this size thermal
convective circulation does not occur.
Conduction,
I wonder if Balsa wood would be suitable? Like polystyrene foam, only
stronger and easy to glue.
Another option would be cardboard.
Readily available, easy to cut.
--
These are my opinions, not necessarily my employer's. I hate spam.
___
Neville Michie wrote:
I wonder if TVB knows what the brown foam in 10811 is? Does it have a
radiation absorbing powder in it?
cheers, Neville Michie
Various foams were tried and or used in the 10811. The main
concerns with foams had nothing to do with insulating qualities
and certainly no
Rick wrote:
We also tried mounting the modified 10811 in Hammond metal box.
Initially, we mounted the 10811 to the box using the
two standoffs that come with the 10811. However, this
degraded the performance somewhat. We removed these and
had the 10811 supported mechanically only by the edge
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