[time-nuts] Austron 2100 chassis

[Perry Sandeen via time-nuts]

Spoken for
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Re: [time-nuts] Stable32 tau

[Anders Wallin]

FWIW since about a month back AllanTools has an example matplotlib-script
that generates graphs similar to Stable32
http://www.anderswallin.net/2019/05/this-is-not-stable32/
that is, if you are prepared to do a bit of python programming...
you need the example-scripts from github, not the older release from pypi.
https://github.com/aewallin/allantools

Anders


On Tue, Jun 11, 2019 at 6:01 AM Chris Burford 
wrote:

> I'm not sure if this post would be of sufficient SNR value to approve for
> comment. Perhaps you may have a quick and easy answer.
>
> I'm using Stable32 to print ADEV, MDEV plots and I would like to have the
> tau values listed as 1, 10, 100, 1000 ...
> Stable32 currently denotes these values in scientific notation (1.00e+00,
> 2.00e+00, 4.00e+00, 1.00e+01 ...)
>
> The data is originally from TimeLab 1.35b exported as ASCII phase data, no
> time stamps. The data looks as follows:
>
> -9.724507003434E-001
> -9.7245070123599986E-001
> -9.724507005128E-001
> -9.7245070079599982E-001
> .
> .
> .
>
>
> I'm looking for the same formatted output for ADEV as the TimeLab plot for
> the tau scale. I think the scientific notation for the tau values adjacent
> to the sigma values just crowds the plot. Is there a way to just get
> logarithmic (base 10) values for the tau plot in Stable32? Any help is
> appreciated.
>
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[time-nuts] Excellent equipment rack

[Perry Sandeen via time-nuts]

Yo Bubba Dudes!,
Needing to go vertical with my test equipment I went bottom feeding for an 
equipment cabinet on ebay.
To make a long search story short: they were way too expensive, too heavy to 
ship and too far away for pickup.
So I kept searching and finally came across what was listed as *42U Four Post 
Open Frame Server Data Rack 19 inches.  Adjustable depth 23 to 32 inches.ebay 
number 152319524877.Sold by Raising Electronics for US $188 and free shipping.
I was unsure what a *U* height meant put it seemed tall enough so I bought one.
I was a little apprehensive about this being a Chinese metal product.  I was 
very pleasantly proven very wrong.
Although it only comes with a picture of an assembled unit it has been engine 
ed so there is no way you can assemble improperly. The four posts are all equal 
and can be installed with any end up or down and the top and bottom brackets 
will fit.  It comes with the exact 50 M6-20 head bolts and nuts needed for 
assembly.  The nearest SAE equivalent bolt size is 1/4 20 x 1/2L which I 
purchased to hold L shelf brackets to the frame.
I set the depth of mine to 26 inches so my 5370's fit well and I had space for 
both power and BNC cables to be inside the frame.

This rack is designed to be bolted to the floor.  Wanting to be able to move 
it, I cut a piece of 3/4 inch plywood a little longer and wider then the base 
footprint and installed 4 inch tall Harbor Freight swivel casters on the four 
corners for ease of movement in any direction, even on floor carpeting.  After 
assembly it was 6 ft 9 inches tall. 

Now this being a bolted together *skeleton frame* it is prone to twisting and 
or becoming a parallelogram sideways.  To prevent twisting, I fitted a plywood 
board on the top bolted to the top front and rear angle pieces.  To prevent a 
side-to-side movement required an 8 inch wide piece of scrap aluminum plate 
bolted to the rear vertical posts.  This is easy to do as there are a plethora 
of precision spaced holes available.
There was some very serious thought given to the vertical post design.  It has 
six 90 degree folds done in such a way that the inner edge on each outer side 
gives a 19 inch opening.
 However behind it is as inner fold where one can install recessed L shaped 
brackets. Now the inner fold is about and inch narrower than the outside 
edge.This allows making a wider shelf that can *float* on top the brackets but 
can't slide out either end.
This was very useful when configuring the instrument arrangement.
I also found that with the bottom shelf being just 6 inches above the floor I 
was able to install more equipment in the same vertical space than in my 
previous normal sized equipment cabinet.
Another bonus with this type of configuration is that it's easier to keep the 
equipment cool and it's much lighter.
Regards,
Perrier

 


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[time-nuts] Racking

[Stan, W1LE via time-nuts]

Thanks for the write up, was interesting. I also fight for effective 
space in the shack.



Stan

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Re: [time-nuts] Excellent equipment rack

[Dave Daniel]

In this case, “U” represents a “Rack Unit” or “RU”, which has been for some 
time the standard unit of height for rack-mountable equipment. One RU has a 
height of 1.75 inches. Pretty much all rack-mountable equipment of which I am 
aware have heights that are integer multiples of 1.75 inches.

DaveD

Sent from a small flat thingy

> On Jun 11, 2019, at 02:02, Perry Sandeen via time-nuts 
>  wrote:
> 
> Yo Bubba Dudes!,
> Needing to go vertical with my test equipment I went bottom feeding for an 
> equipment cabinet on ebay.
> To make a long search story short: they were way too expensive, too heavy to 
> ship and too far away for pickup.
> So I kept searching and finally came across what was listed as *42U Four Post 
> Open Frame Server Data Rack 19 inches.  Adjustable depth 23 to 32 inches.ebay 
> number 152319524877.Sold by Raising Electronics for US $188 and free shipping.
> I was unsure what a *U* height meant put it seemed tall enough so I bought 
> one.
> I was a little apprehensive about this being a Chinese metal product.  I was 
> very pleasantly proven very wrong.
> Although it only comes with a picture of an assembled unit it has been engine 
> ed so there is no way you can assemble improperly. The four posts are all 
> equal and can be installed with any end up or down and the top and bottom 
> brackets will fit.  It comes with the exact 50 M6-20 head bolts and nuts 
> needed for assembly.  The nearest SAE equivalent bolt size is 1/4 20 x 1/2L 
> which I purchased to hold L shelf brackets to the frame.
> I set the depth of mine to 26 inches so my 5370's fit well and I had space 
> for both power and BNC cables to be inside the frame.
> 
> This rack is designed to be bolted to the floor.  Wanting to be able to move 
> it, I cut a piece of 3/4 inch plywood a little longer and wider then the base 
> footprint and installed 4 inch tall Harbor Freight swivel casters on the four 
> corners for ease of movement in any direction, even on floor carpeting.  
> After assembly it was 6 ft 9 inches tall. 
> 
> Now this being a bolted together *skeleton frame* it is prone to twisting and 
> or becoming a parallelogram sideways.  To prevent twisting, I fitted a 
> plywood board on the top bolted to the top front and rear angle pieces.  To 
> prevent a side-to-side movement required an 8 inch wide piece of scrap 
> aluminum plate bolted to the rear vertical posts.  This is easy to do as 
> there are a plethora of precision spaced holes available.
> There was some very serious thought given to the vertical post design.  It 
> has six 90 degree folds done in such a way that the inner edge on each outer 
> side gives a 19 inch opening.
>  However behind it is as inner fold where one can install recessed L shaped 
> brackets. Now the inner fold is about and inch narrower than the outside 
> edge.This allows making a wider shelf that can *float* on top the brackets 
> but can't slide out either end.
> This was very useful when configuring the instrument arrangement.
> I also found that with the bottom shelf being just 6 inches above the floor I 
> was able to install more equipment in the same vertical space than in my 
> previous normal sized equipment cabinet.
> Another bonus with this type of configuration is that it's easier to keep the 
> equipment cool and it's much lighter.
> Regards,
> Perrier
> 
>  
> 
> 
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> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
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Re: [time-nuts] Excellent equipment rack

[John Ackermann. N8UR]

Star Case (https:www.starcase.com) is  U.S. company (in Indiana)  that sells 
similar open-frame rack kits for very reasonable prices.  I have several and 
have been very pleased.  They are available whatever height you want, with 
depths of 20 to 30 inches.  They have lots of accessories to trick out your 
rack.

As Perry ssid, they are quite wobbly but they have various cross braces 
available that will stiffen them up.  I have hundreds of pounds in a 6 foot one 
and it's rock-stable.

They ship broken down in a flat box plus tall cardboard tube for the vertical.  
Assembly is bssically like an Erector Set.

On Jun 11, 2019, 7:00 AM, at 7:00 AM, Perry Sandeen via time-nuts 
 wrote:
>Yo Bubba Dudes!,
>Needing to go vertical with my test equipment I went bottom feeding for
>an equipment cabinet on ebay.
>To make a long search story short: they were way too expensive, too
>heavy to ship and too far away for pickup.
>So I kept searching and finally came across what was listed as *42U
>Four Post Open Frame Server Data Rack 19 inches.  Adjustable depth 23
>to 32 inches.ebay number 152319524877.Sold by Raising Electronics for
>US $188 and free shipping.
>I was unsure what a *U* height meant put it seemed tall enough so I
>bought one.
>I was a little apprehensive about this being a Chinese metal product. 
>I was very pleasantly proven very wrong.
>Although it only comes with a picture of an assembled unit it has been
>engine ed so there is no way you can assemble improperly. The four
>posts are all equal and can be installed with any end up or down and
>the top and bottom brackets will fit.  It comes with the exact 50 M6-20
>head bolts and nuts needed for assembly.  The nearest SAE equivalent
>bolt size is 1/4 20 x 1/2L which I purchased to hold L shelf brackets
>to the frame.
>I set the depth of mine to 26 inches so my 5370's fit well and I had
>space for both power and BNC cables to be inside the frame.
>
>This rack is designed to be bolted to the floor.  Wanting to be able to
>move it, I cut a piece of 3/4 inch plywood a little longer and wider
>then the base footprint and installed 4 inch tall Harbor Freight swivel
>casters on the four corners for ease of movement in any direction, even
>on floor carpeting.  After assembly it was 6 ft 9 inches tall. 
>
>Now this being a bolted together *skeleton frame* it is prone to
>twisting and or becoming a parallelogram sideways.  To prevent
>twisting, I fitted a plywood board on the top bolted to the top front
>and rear angle pieces.  To prevent a side-to-side movement required an
>8 inch wide piece of scrap aluminum plate bolted to the rear vertical
>posts.  This is easy to do as there are a plethora of precision spaced
>holes available.
>There was some very serious thought given to the vertical post design. 
>It has six 90 degree folds done in such a way that the inner edge on
>each outer side gives a 19 inch opening.
> However behind it is as inner fold where one can install recessed L
>shaped brackets. Now the inner fold is about and inch narrower than the
>outside edge.This allows making a wider shelf that can *float* on top
>the brackets but can't slide out either end.
>This was very useful when configuring the instrument arrangement.
>I also found that with the bottom shelf being just 6 inches above the
>floor I was able to install more equipment in the same vertical space
>than in my previous normal sized equipment cabinet.
>Another bonus with this type of configuration is that it's easier to
>keep the equipment cool and it's much lighter.
>Regards,
>Perrier
>
> 
>
>
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>http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
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Re: [time-nuts] Excellent equipment rack

[paul swed]

Have used older 2 post racks for years. Have 10 in service and like them.
The older ones had been available cheap and are very sturdy/heavy. Like
Perry I have done the wood base. Longer out the back then the depth of
equipment for stability.
If you do find older 2 post racks there are 2 types. The EIA screw thread
and telco thread.
Enjoy.
Paul
WB8TSL

On Tue, Jun 11, 2019 at 9:00 AM John Ackermann. N8UR  wrote:

> Star Case (https:www.starcase.com) is  U.S. company (in Indiana)  that
> sells similar open-frame rack kits for very reasonable prices.  I have
> several and have been very pleased.  They are available whatever height you
> want, with depths of 20 to 30 inches.  They have lots of accessories to
> trick out your rack.
>
> As Perry ssid, they are quite wobbly but they have various cross braces
> available that will stiffen them up.  I have hundreds of pounds in a 6 foot
> one and it's rock-stable.
>
> They ship broken down in a flat box plus tall cardboard tube for the
> vertical.  Assembly is bssically like an Erector Set.
>
> On Jun 11, 2019, 7:00 AM, at 7:00 AM, Perry Sandeen via time-nuts <
> time-nuts@lists.febo.com> wrote:
> >Yo Bubba Dudes!,
> >Needing to go vertical with my test equipment I went bottom feeding for
> >an equipment cabinet on ebay.
> >To make a long search story short: they were way too expensive, too
> >heavy to ship and too far away for pickup.
> >So I kept searching and finally came across what was listed as *42U
> >Four Post Open Frame Server Data Rack 19 inches.  Adjustable depth 23
> >to 32 inches.ebay number 152319524877.Sold by Raising Electronics for
> >US $188 and free shipping.
> >I was unsure what a *U* height meant put it seemed tall enough so I
> >bought one.
> >I was a little apprehensive about this being a Chinese metal product.
> >I was very pleasantly proven very wrong.
> >Although it only comes with a picture of an assembled unit it has been
> >engine ed so there is no way you can assemble improperly. The four
> >posts are all equal and can be installed with any end up or down and
> >the top and bottom brackets will fit.  It comes with the exact 50 M6-20
> >head bolts and nuts needed for assembly.  The nearest SAE equivalent
> >bolt size is 1/4 20 x 1/2L which I purchased to hold L shelf brackets
> >to the frame.
> >I set the depth of mine to 26 inches so my 5370's fit well and I had
> >space for both power and BNC cables to be inside the frame.
> >
> >This rack is designed to be bolted to the floor.  Wanting to be able to
> >move it, I cut a piece of 3/4 inch plywood a little longer and wider
> >then the base footprint and installed 4 inch tall Harbor Freight swivel
> >casters on the four corners for ease of movement in any direction, even
> >on floor carpeting.  After assembly it was 6 ft 9 inches tall.
> >
> >Now this being a bolted together *skeleton frame* it is prone to
> >twisting and or becoming a parallelogram sideways.  To prevent
> >twisting, I fitted a plywood board on the top bolted to the top front
> >and rear angle pieces.  To prevent a side-to-side movement required an
> >8 inch wide piece of scrap aluminum plate bolted to the rear vertical
> >posts.  This is easy to do as there are a plethora of precision spaced
> >holes available.
> >There was some very serious thought given to the vertical post design.
> >It has six 90 degree folds done in such a way that the inner edge on
> >each outer side gives a 19 inch opening.
> > However behind it is as inner fold where one can install recessed L
> >shaped brackets. Now the inner fold is about and inch narrower than the
> >outside edge.This allows making a wider shelf that can *float* on top
> >the brackets but can't slide out either end.
> >This was very useful when configuring the instrument arrangement.
> >I also found that with the bottom shelf being just 6 inches above the
> >floor I was able to install more equipment in the same vertical space
> >than in my previous normal sized equipment cabinet.
> >Another bonus with this type of configuration is that it's easier to
> >keep the equipment cool and it's much lighter.
> >Regards,
> >Perrier
> >
> >
> >
> >
> >___
> >time-nuts mailing list -- time-nuts@lists.febo.com
> >To unsubscribe, go to
> >http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> >and follow the instructions there.
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Re: [time-nuts] Excellent equipment rack

[Glenn Little WB4UIV]

Here is what a U is:

Main article: Rack unit 

Racks are divided into regions, 44.50 millimeters (1.752??in) in height, 
within which there are three complete hole pairs in a vertically 
symmetric pattern, the holes being centered 6.35 millimeters (0.25??in), 
22.25 millimeters (0.88??in), and 38.15 millimeters (1.50??in) from the 
top or bottom of the region. Such a region is commonly known as a *U*, 
for /unit/, or, in German, *HE*, for /H??heneinheit 
/, and heights within 
racks are measured by this unit. Rack-mountable equipment is usually 
designed to occupy some integer number of U. For example, an 
oscilloscope  might be 4U 
high, and rack-mountable computers are mostly between 1U and 4U high. A 
blade server  enclosure 
might require 10U.


Occasionally, one may see fractional U devices such as a 1.5U server, 
but these are much less common.


The height of a rack can vary from a few inches, such as in a broadcast 
console, to a floor mounted rack whose interior is 45 rack units (200.2 
centimeters or 78.82 inches) high, with 42U being a common 
configuration. Many wall-mounted industrial equipment enclosures have 
19-inch rack rails to support mounting of equipment.



A R-390 is 10.5 inches tall so it is 6U.

Your rack could be drilled for using mounting screws of: 10-32, 12-24, 
M6 or require a nut plate for equipment mounting.


73
Glenn

On 6/11/2019 2:02 AM, Perry Sandeen via time-nuts wrote:

Yo Bubba Dudes!,
Needing to go vertical with my test equipment I went bottom feeding for an 
equipment cabinet on ebay.
To make a long search story short: they were way too expensive, too heavy to 
ship and too far away for pickup.
So I kept searching and finally came across what was listed as *42U Four Post 
Open Frame Server Data Rack 19 inches.?? Adjustable depth 23 to 32 inches.ebay 
number 152319524877.Sold by Raising Electronics for US $188 and free shipping.
I was unsure what a *U* height meant put it seemed tall enough so I bought one.
I was a little apprehensive about this being a Chinese metal product.?? I was 
very pleasantly proven very wrong.
Although it only comes with a picture of an assembled unit it has been engine 
ed so there is no way you can assemble improperly. The four posts are all equal 
and can be installed with any end up or down and the top and bottom brackets 
will fit.?? It comes with the exact 50 M6-20 head bolts and nuts needed for 
assembly.?? The nearest SAE equivalent bolt size is 1/4 20 x 1/2L which I 
purchased to hold L shelf brackets to the frame.
I set the depth of mine to 26 inches so my 5370's fit well and I had space for 
both power and BNC cables to be inside the frame.

This rack is designed to be bolted to the floor.?? Wanting to be able to move 
it, I cut a piece of 3/4 inch plywood a little longer and wider then the base 
footprint and installed 4 inch tall Harbor Freight swivel casters on the four 
corners for ease of movement in any direction, even on floor carpeting.?? After 
assembly it was 6 ft 9 inches tall.

Now this being a bolted together *skeleton frame* it is prone to twisting and 
or becoming a parallelogram sideways.?? To prevent twisting, I fitted a plywood 
board on the top bolted to the top front and rear angle pieces.?? To prevent a 
side-to-side movement required an 8 inch wide piece of scrap aluminum plate 
bolted to the rear vertical posts.?? This is easy to do as there are a plethora 
of precision spaced holes available.
There was some very serious thought given to the vertical post design.?? It has 
six 90 degree folds done in such a way that the inner edge on each outer side 
gives a 19 inch opening.
 ??However behind it is as inner fold where one can install recessed L shaped 
brackets. Now the inner fold is about and inch narrower than the outside 
edge.This allows making a wider shelf that can *float* on top the brackets but 
can't slide out either end.
This was very useful when configuring the instrument arrangement.
I also found that with the bottom shelf being just 6 inches above the floor I 
was able to install more equipment in the same vertical space than in my 
previous normal sized equipment cabinet.
Another bonus with this type of configuration is that it's easier to keep the 
equipment cool and it's much lighter.
Regards,
Perrier

  



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--
---
Glenn LittleARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIVwb4...@arrl.netAMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is 

Re: [time-nuts] Stable32 tau

[rfnuts]

Chris,

selct 'Decade' in the bottom right corner of the 'Run' menu.

Adrian

Am 11.06.2019 um 03:45 schrieb Chris Burford:
> I'm not sure if this post would be of sufficient SNR value to approve for 
> comment. Perhaps you may have a quick and easy answer.
> 
> I'm using Stable32 to print ADEV, MDEV plots and I would like to have the tau 
> values listed as 1, 10, 100, 1000 ...
> Stable32 currently denotes these values in scientific notation (1.00e+00, 
> 2.00e+00, 4.00e+00, 1.00e+01 ...)
> 
> The data is originally from TimeLab 1.35b exported as ASCII phase data, no 
> time stamps. The data looks as follows:
> 
> -9.724507003434E-001
> -9.7245070123599986E-001
> -9.724507005128E-001
> -9.7245070079599982E-001
> .
> .
> .
> 
> 
> I'm looking for the same formatted output for ADEV as the TimeLab plot for 
> the tau scale. I think the scientific notation for the tau values adjacent to 
> the sigma values just crowds the plot. Is there a way to just get logarithmic 
> (base 10) values for the tau plot in Stable32? Any help is appreciated.
> 
> ___
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> To unsubscribe, go to 
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> and follow the instructions there.
> 
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Re: [time-nuts] Excellent equipment rack + time nuts at HamRadio 2019 ??

[Gerhard Hoffmann]

Am 11.06.19 um 13:36 schrieb John Ackermann. N8UR:

Star Case (https:www.starcase.com) is  U.S. company (in Indiana)  that sells 
similar open-frame rack kits for very reasonable prices.  I have several and 
have been very pleased.  They are available whatever height you want, with 
depths of 20 to 30 inches.  They have lots of accessories to trick out your 
rack.



It seems that IKEA "Lack" attracts more and more people to house their 
19" devices.


They happen to fit and can easily be stapled.

< 
https://www.google.de/search?tbm=isch&sa=1&ei=TKf_XJ_hOPWX1fAPuumb0Ao&q=ikea+19+rack+Lack&oq=ikea+19+rack+Lack&gs_l=img.3...1413445.1415147..1415721...0.0..0.123.586.0j5..01..gws-wiz-img...0i30j0i8i30.sA8Vs2Zj4nM 
   >




I have also built a table/rack combination from Ikea material.

The working table is 2 pcs. Ikea Pronomen wood, 60*200 cm each.

It has 8 legs and is 120 cm deep.


The 1st and 2nd story are also  1 Ikea Pronomen each, with shorter legs.

The rack to the right is standard Schroff/Hofman stuff. It can be rolled 
to the right


to the mechanics section to get it it out of the way.


The biggest thing since last week is the hanging mount of the 
microscope. :-)  :-)  :-)


Finally, no more clumsy, heavy microscope foot  that used to be always 
in the way.


< 
https://www.flickr.com/photos/137684711@N07/48043564871/in/dateposted-public/lightbox/ 
  >



While I'm at it:

Are there any time nuts at the HAM Radio in Friedrichshafen, the weekend 
around 21.June?


I'll be there to visit the SDR subconference.

<    http://2019.sdra.io/pages/programme.html  >


regards,

Gerhard, DK4XP




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Re: [time-nuts] Stable32 tau

[CBURFORD1]

I've tried both Decade and Octave and it still denotes the tau values
located in the upper right plot as scientific notation. I have seen
other Stable32 plots from other users where the tau values were
displayed as 1, 2, 4, 10, 20, 40, 100 and so on.

 I'm still looking through the options in Stable32. I will say that
TimeLab is a much easier to use application.
Thanks for the help.

  rfnuts  wrote: 
 > Chris,
 > 
 > selct 'Decade' in the bottom right corner of the 'Run' menu.
 > 
 > Adrian
 > 
 > Am 11.06.2019 um 03:45 schrieb Chris Burford:
 > > I'm not sure if this post would be of sufficient SNR value to
approve for comment. Perhaps you may have a quick and easy answer.
 > > 
 > > I'm using Stable32 to print ADEV, MDEV plots and I would like to
have the tau values listed as 1, 10, 100, 1000 ...
 > > Stable32 currently denotes these values in scientific notation
(1.00e+00, 2.00e+00, 4.00e+00, 1.00e+01 ...)
 > > 
 > > The data is originally from TimeLab 1.35b exported as ASCII phase
data, no time stamps. The data looks as follows:
 > > 
 > > -9.724507003434E-001
 > > -9.7245070123599986E-001
 > > -9.724507005128E-001
 > > -9.7245070079599982E-001
 > > .
 > > .
 > > .
 > > 
 > > 
 > > I'm looking for the same formatted output for ADEV as the TimeLab
plot for the tau scale. I think the scientific notation for the tau
values adjacent to the sigma values just crowds the plot. Is there a
way to just get logarithmic (base 10) values for the tau plot in
Stable32? Any help is appreciated.
 > > 
 > > ___
 > > time-nuts mailing list -- time-nuts@lists.febo.com
 > > To unsubscribe, go to
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Re: [time-nuts] Excellent equipment rack

[Bob Albert via time-nuts]

 Very interesting!  Recently I had a somewhat similar experience.  My neighbor 
was throwing out some shelving that looked like what I need.  It was gray 
steel, all the vertical parts needed but no shelves.  I made shelves from 
plywood and ended up with a nice addition to my lab.  To make it mobile I sat 
it on a dolly that fit almost perfectly so now I can move it.
I put my VNA and some tools on it and it's a perfect fit in the corner of the 
room.
Just because I am an electronics engineer doesn't mean I can't do mechanical 
stuff.
Bob
On Tuesday, June 11, 2019, 08:00:43 AM PDT, Glenn Little WB4UIV 
 wrote:  
 
 Here is what a U is:

Main article: Rack unit 

Racks are divided into regions, 44.50 millimeters (1.752??in) in height, 
within which there are three complete hole pairs in a vertically 
symmetric pattern, the holes being centered 6.35 millimeters (0.25??in), 
22.25 millimeters (0.88??in), and 38.15 millimeters (1.50??in) from the 
top or bottom of the region. Such a region is commonly known as a *U*, 
for /unit/, or, in German, *HE*, for /H??heneinheit 
/, and heights within 
racks are measured by this unit. Rack-mountable equipment is usually 
designed to occupy some integer number of U. For example, an 
oscilloscope  might be 4U 
high, and rack-mountable computers are mostly between 1U and 4U high. A 
blade server  enclosure 
might require 10U.

Occasionally, one may see fractional U devices such as a 1.5U server, 
but these are much less common.

The height of a rack can vary from a few inches, such as in a broadcast 
console, to a floor mounted rack whose interior is 45 rack units (200.2 
centimeters or 78.82 inches) high, with 42U being a common 
configuration. Many wall-mounted industrial equipment enclosures have 
19-inch rack rails to support mounting of equipment.


A R-390 is 10.5 inches tall so it is 6U.

Your rack could be drilled for using mounting screws of: 10-32, 12-24, 
M6 or require a nut plate for equipment mounting.

73
Glenn

On 6/11/2019 2:02 AM, Perry Sandeen via time-nuts wrote:
> Yo Bubba Dudes!,
> Needing to go vertical with my test equipment I went bottom feeding for an 
> equipment cabinet on ebay.
> To make a long search story short: they were way too expensive, too heavy to 
> ship and too far away for pickup.
> So I kept searching and finally came across what was listed as *42U Four Post 
> Open Frame Server Data Rack 19 inches.?? Adjustable depth 23 to 32 
> inches.ebay number 152319524877.Sold by Raising Electronics for US $188 and 
> free shipping.
> I was unsure what a *U* height meant put it seemed tall enough so I bought 
> one.
> I was a little apprehensive about this being a Chinese metal product.?? I was 
> very pleasantly proven very wrong.
> Although it only comes with a picture of an assembled unit it has been engine 
> ed so there is no way you can assemble improperly. The four posts are all 
> equal and can be installed with any end up or down and the top and bottom 
> brackets will fit.?? It comes with the exact 50 M6-20 head bolts and nuts 
> needed for assembly.?? The nearest SAE equivalent bolt size is 1/4 20 x 1/2L 
> which I purchased to hold L shelf brackets to the frame.
> I set the depth of mine to 26 inches so my 5370's fit well and I had space 
> for both power and BNC cables to be inside the frame.
>
> This rack is designed to be bolted to the floor.?? Wanting to be able to move 
> it, I cut a piece of 3/4 inch plywood a little longer and wider then the base 
> footprint and installed 4 inch tall Harbor Freight swivel casters on the four 
> corners for ease of movement in any direction, even on floor carpeting.?? 
> After assembly it was 6 ft 9 inches tall.
>
> Now this being a bolted together *skeleton frame* it is prone to twisting and 
> or becoming a parallelogram sideways.?? To prevent twisting, I fitted a 
> plywood board on the top bolted to the top front and rear angle pieces.?? To 
> prevent a side-to-side movement required an 8 inch wide piece of scrap 
> aluminum plate bolted to the rear vertical posts.?? This is easy to do as 
> there are a plethora of precision spaced holes available.
> There was some very serious thought given to the vertical post design.?? It 
> has six 90 degree folds done in such a way that the inner edge on each outer 
> side gives a 19 inch opening.
>  ??However behind it is as inner fold where one can install recessed L shaped 
>brackets. Now the inner fold is about and inch narrower than the outside 
>edge.This allows making a wider shelf that can *float* on top the brackets but 
>can't slide out either end.
> This was very useful when configuring the instrument arrangement.
> I also found that with the bottom shelf being just 6 inches above the floor I 
> was able to install more equipment in the same vertical space than

[time-nuts] Is there anyone local to me with an 8.5 digit multimeter?

[Dr. David Kirkby]

I'm located in Althorne, Essex (CM3 6DT). I'd like to get a couple of
resistors (10 M and 100 M) measured on an 8.5 digit meter, then compare
them to what a 34970A data acquisition unit says. I don't want to spend a
fortune on very high-end resistors, so bringing the unit to a 3458A, and
measuring the resistor on two meters reasonably close in time, should be
enough.

There are some issues with these data acquisition meters, which impacts
their stability. It does not help the fact that there's no S/N on it, so i
don't now if it has any particular fault.

-- 
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
https://www.kirkbymicrowave.co.uk/
Tel 01621-680100 / +44 1621-680100
___
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To unsubscribe, go to 
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and follow the instructions there.

Re: [time-nuts] Excellent equipment rack

[Tom Knox]

Hi All;
I have found when rack hunting it is best to look at local test equipment 
auctions. Even really nice racks often do not receive any bids and more 
importantly no shipping. In my labs I use exclusively Agilent/Keysight because 
they are exceptional quality and parts a commonly available. The one minor 
problem is they are a touch narrow, and some items like Wavelek calibrators are 
a really tight fit, but workable. I find in local auctions when they show up 
they are (like other racks) usually very inexpensive. The trick is if you have 
any plan to go to racks in the future start looking early and buy when you see 
them even if not yet prepared to use them and store them until needed.
Hope that helps

Tom Knox

303-554-0307

act...@hotmail.com

"Peace is not the absence of violence, but the presence of Justice" Both MLK 
and Albert Einstein


From: time-nuts  on behalf of Bob Albert via 
time-nuts 
Sent: Tuesday, June 11, 2019 9:59 AM
To: Perry Sandeen via time-nuts
Cc: Bob Albert
Subject: Re: [time-nuts] Excellent equipment rack

Very interesting!  Recently I had a somewhat similar experience.  My neighbor 
was throwing out some shelving that looked like what I need.  It was gray 
steel, all the vertical parts needed but no shelves.  I made shelves from 
plywood and ended up with a nice addition to my lab.  To make it mobile I sat 
it on a dolly that fit almost perfectly so now I can move it.
I put my VNA and some tools on it and it's a perfect fit in the corner of the 
room.
Just because I am an electronics engineer doesn't mean I can't do mechanical 
stuff.
Bob
On Tuesday, June 11, 2019, 08:00:43 AM PDT, Glenn Little WB4UIV 
 wrote:

 Here is what a U is:

Main article: Rack unit 

Racks are divided into regions, 44.50 millimeters (1.752??in) in height,
within which there are three complete hole pairs in a vertically
symmetric pattern, the holes being centered 6.35 millimeters (0.25??in),
22.25 millimeters (0.88??in), and 38.15 millimeters (1.50??in) from the
top or bottom of the region. Such a region is commonly known as a *U*,
for /unit/, or, in German, *HE*, for /H??heneinheit
/, and heights within
racks are measured by this unit. Rack-mountable equipment is usually
designed to occupy some integer number of U. For example, an
oscilloscope  might be 4U
high, and rack-mountable computers are mostly between 1U and 4U high. A
blade server  enclosure
might require 10U.

Occasionally, one may see fractional U devices such as a 1.5U server,
but these are much less common.

The height of a rack can vary from a few inches, such as in a broadcast
console, to a floor mounted rack whose interior is 45 rack units (200.2
centimeters or 78.82 inches) high, with 42U being a common
configuration. Many wall-mounted industrial equipment enclosures have
19-inch rack rails to support mounting of equipment.


A R-390 is 10.5 inches tall so it is 6U.

Your rack could be drilled for using mounting screws of: 10-32, 12-24,
M6 or require a nut plate for equipment mounting.

73
Glenn

On 6/11/2019 2:02 AM, Perry Sandeen via time-nuts wrote:
> Yo Bubba Dudes!,
> Needing to go vertical with my test equipment I went bottom feeding for an 
> equipment cabinet on ebay.
> To make a long search story short: they were way too expensive, too heavy to 
> ship and too far away for pickup.
> So I kept searching and finally came across what was listed as *42U Four Post 
> Open Frame Server Data Rack 19 inches.?? Adjustable depth 23 to 32 
> inches.ebay number 152319524877.Sold by Raising Electronics for US $188 and 
> free shipping.
> I was unsure what a *U* height meant put it seemed tall enough so I bought 
> one.
> I was a little apprehensive about this being a Chinese metal product.?? I was 
> very pleasantly proven very wrong.
> Although it only comes with a picture of an assembled unit it has been engine 
> ed so there is no way you can assemble improperly. The four posts are all 
> equal and can be installed with any end up or down and the top and bottom 
> brackets will fit.?? It comes with the exact 50 M6-20 head bolts and nuts 
> needed for assembly.?? The nearest SAE equivalent bolt size is 1/4 20 x 1/2L 
> which I purchased to hold L shelf brackets to the frame.
> I set the depth of mine to 26 inches so my 5370's fit well and I had space 
> for both power and BNC cables to be inside the frame.
>
> This rack is designed to be bolted to the floor.?? Wanting to be able to move 
> it, I cut a piece of 3/4 inch plywood a little longer and wider then the base 
> footprint and installed 4 inch tall Harbor Freight swivel casters on the four 
> corners for ease of movement in any direction, even on floor carpeting.?? 
> After assembly it was 6 ft 9 inches tall.
>
> Now this being a bolted together *skeleton frame* it i

Re: [time-nuts] Excellent equipment rack

[paul swed]

I have found my racks at the MIT flea in the past.
The great thing about 2 posters is they easily come apart and can fit in
the car.
Plus the pieces by themselves are reasonable in weight.
Regards
Paul

On Tue, Jun 11, 2019 at 2:05 PM Tom Knox  wrote:

> Hi All;
> I have found when rack hunting it is best to look at local test equipment
> auctions. Even really nice racks often do not receive any bids and more
> importantly no shipping. In my labs I use exclusively Agilent/Keysight
> because they are exceptional quality and parts a commonly available. The
> one minor problem is they are a touch narrow, and some items like Wavelek
> calibrators are a really tight fit, but workable. I find in local auctions
> when they show up they are (like other racks) usually very inexpensive. The
> trick is if you have any plan to go to racks in the future start looking
> early and buy when you see them even if not yet prepared to use them and
> store them until needed.
> Hope that helps
>
> Tom Knox
>
> 303-554-0307
>
> act...@hotmail.com
>
> "Peace is not the absence of violence, but the presence of Justice" Both
> MLK and Albert Einstein
>
> 
> From: time-nuts  on behalf of Bob
> Albert via time-nuts 
> Sent: Tuesday, June 11, 2019 9:59 AM
> To: Perry Sandeen via time-nuts
> Cc: Bob Albert
> Subject: Re: [time-nuts] Excellent equipment rack
>
> Very interesting!  Recently I had a somewhat similar experience.  My
> neighbor was throwing out some shelving that looked like what I need.  It
> was gray steel, all the vertical parts needed but no shelves.  I made
> shelves from plywood and ended up with a nice addition to my lab.  To make
> it mobile I sat it on a dolly that fit almost perfectly so now I can move
> it.
> I put my VNA and some tools on it and it's a perfect fit in the corner of
> the room.
> Just because I am an electronics engineer doesn't mean I can't do
> mechanical stuff.
> Bob
> On Tuesday, June 11, 2019, 08:00:43 AM PDT, Glenn Little WB4UIV <
> glennmaill...@bellsouth.net> wrote:
>
>  Here is what a U is:
>
> Main article: Rack unit 
>
> Racks are divided into regions, 44.50 millimeters (1.752??in) in height,
> within which there are three complete hole pairs in a vertically
> symmetric pattern, the holes being centered 6.35 millimeters (0.25??in),
> 22.25 millimeters (0.88??in), and 38.15 millimeters (1.50??in) from the
> top or bottom of the region. Such a region is commonly known as a *U*,
> for /unit/, or, in German, *HE*, for /H??heneinheit
> /, and heights within
> racks are measured by this unit. Rack-mountable equipment is usually
> designed to occupy some integer number of U. For example, an
> oscilloscope  might be 4U
> high, and rack-mountable computers are mostly between 1U and 4U high. A
> blade server  enclosure
> might require 10U.
>
> Occasionally, one may see fractional U devices such as a 1.5U server,
> but these are much less common.
>
> The height of a rack can vary from a few inches, such as in a broadcast
> console, to a floor mounted rack whose interior is 45 rack units (200.2
> centimeters or 78.82 inches) high, with 42U being a common
> configuration. Many wall-mounted industrial equipment enclosures have
> 19-inch rack rails to support mounting of equipment.
>
>
> A R-390 is 10.5 inches tall so it is 6U.
>
> Your rack could be drilled for using mounting screws of: 10-32, 12-24,
> M6 or require a nut plate for equipment mounting.
>
> 73
> Glenn
>
> On 6/11/2019 2:02 AM, Perry Sandeen via time-nuts wrote:
> > Yo Bubba Dudes!,
> > Needing to go vertical with my test equipment I went bottom feeding for
> an equipment cabinet on ebay.
> > To make a long search story short: they were way too expensive, too
> heavy to ship and too far away for pickup.
> > So I kept searching and finally came across what was listed as *42U Four
> Post Open Frame Server Data Rack 19 inches.?? Adjustable depth 23 to 32
> inches.ebay number 152319524877.Sold by Raising Electronics for US $188 and
> free shipping.
> > I was unsure what a *U* height meant put it seemed tall enough so I
> bought one.
> > I was a little apprehensive about this being a Chinese metal product.??
> I was very pleasantly proven very wrong.
> > Although it only comes with a picture of an assembled unit it has been
> engine ed so there is no way you can assemble improperly. The four posts
> are all equal and can be installed with any end up or down and the top and
> bottom brackets will fit.?? It comes with the exact 50 M6-20 head bolts and
> nuts needed for assembly.?? The nearest SAE equivalent bolt size is 1/4 20
> x 1/2L which I purchased to hold L shelf brackets to the frame.
> > I set the depth of mine to 26 inches so my 5370's fit well and I had
> space for both power and BNC cables to be inside the frame.
> >
> > T

Re: [time-nuts] Is there anyone local to me with an 8.5 digit multimeter?

[tcurlee]

You likely know this, but clean the resistors with alcohol before measuring.  
Finger prints can cause significant errors, particularly on the higher value 
resistor.Regards, Tom Curlee.Sent via the Samsung GALAXY S®4, an AT&T 4G LTE 
smartphone

 Original message 
From: "Dr. David Kirkby"  
Date: 06/11/2019  9:54 AM  (GMT-08:00) 
To: time-nuts@lists.febo.com 
Subject: [time-nuts] Is there anyone local to me with an 8.5 digit
  multimeter? 

I'm located in Althorne, Essex (CM3 6DT). I'd like to get a couple ofresistors 
(10 M and 100 M) measured on an 8.5 digit meter, then comparethem to what a 
34970A data acquisition unit says. I don't want to spend afortune on very 
high-end resistors, so bringing the unit to a 3458A, andmeasuring the resistor 
on two meters reasonably close in time, should beenough.There are some issues 
with these data acquisition meters, which impactstheir stability. It does not 
help the fact that there's no S/N on it, so idon't now if it has any particular 
fault.-- Dr David Kirkby Ph.D C.Eng MIETKirkby Microwave LtdRegistered office: 
Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,Essex, CM3 6DT, United 
Kingdom.Registered in England and Wales as company number 
08914892https://www.kirkbymicrowave.co.uk/Tel 01621-680100 / +44 
1621-680100___time-nuts mailing 
list -- time-n...@lists.febo.comTo unsubscribe, go to 
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.comand follow the 
instructions there.
___
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and follow the instructions there.

Re: [time-nuts] Stable32 tau

[Tom Van Baak]

Chris,

If your data set is small enough (e.g., less than 40,000 points) so that all 
the tau are 4 digits or less then Stable32 will use plain integers in the 
little tau+sigma box inserted into the ADEV plot. For non-integer tau, or data 
sets that result in tau values 1 or greater, Stable32 uses scientific 
notation for all values.

Note that if you select the "all tau" (or "many tau") option instead of decade 
or octave the the table does not appear at all, resulting in cleaner plots. Almost all the ADEV 
plots on my web site are done with many tau and thus the corner box of clutter does not appear.

The axis labels of a Stable32 ADEV plot are done using 10^x notation, rather 
than log10 or scientific notation (like TimeLab). Neither tool gives much 
flexibility to the plot format.

/tvb


On 6/10/2019 6:45 PM, Chris Burford wrote:

I'm not sure if this post would be of sufficient SNR value to approve for 
comment. Perhaps you may have a quick and easy answer.

I'm using Stable32 to print ADEV, MDEV plots and I would like to have the tau 
values listed as 1, 10, 100, 1000 ...
Stable32 currently denotes these values in scientific notation (1.00e+00, 
2.00e+00, 4.00e+00, 1.00e+01 ...)

The data is originally from TimeLab 1.35b exported as ASCII phase data, no time 
stamps. The data looks as follows:

-9.724507003434E-001
-9.7245070123599986E-001
-9.724507005128E-001
-9.7245070079599982E-001
.
.
.


I'm looking for the same formatted output for ADEV as the TimeLab plot for the 
tau scale. I think the scientific notation for the tau values adjacent to the 
sigma values just crowds the plot. Is there a way to just get logarithmic (base 
10) values for the tau plot in Stable32? Any help is appreciated.

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Re: [time-nuts] Excellent equipment rack

[Brooke Clarke]

Hi Perrier:

Here's some info on 19" Racks:
https://prc68.com/I/Rack.shtml

--
Have Fun,

Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how 
well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

 Original Message 

Yo Bubba Dudes!,
Needing to go vertical with my test equipment I went bottom feeding for an 
equipment cabinet on ebay.
To make a long search story short: they were way too expensive, too heavy to 
ship and too far away for pickup.
So I kept searching and finally came across what was listed as *42U Four Post 
Open Frame Server Data Rack 19 inches.  Adjustable depth 23 to 32 inches.ebay 
number 152319524877.Sold by Raising Electronics for US $188 and free shipping.
I was unsure what a *U* height meant put it seemed tall enough so I bought one.
I was a little apprehensive about this being a Chinese metal product.  I was 
very pleasantly proven very wrong.
Although it only comes with a picture of an assembled unit it has been engine 
ed so there is no way you can assemble improperly. The four posts are all equal 
and can be installed with any end up or down and the top and bottom brackets 
will fit.  It comes with the exact 50 M6-20 head bolts and nuts needed for 
assembly.  The nearest SAE equivalent bolt size is 1/4 20 x 1/2L which I 
purchased to hold L shelf brackets to the frame.
I set the depth of mine to 26 inches so my 5370's fit well and I had space for 
both power and BNC cables to be inside the frame.

This rack is designed to be bolted to the floor.  Wanting to be able to move 
it, I cut a piece of 3/4 inch plywood a little longer and wider then the base 
footprint and installed 4 inch tall Harbor Freight swivel casters on the four 
corners for ease of movement in any direction, even on floor carpeting.  After 
assembly it was 6 ft 9 inches tall.

Now this being a bolted together *skeleton frame* it is prone to twisting and 
or becoming a parallelogram sideways.  To prevent twisting, I fitted a plywood 
board on the top bolted to the top front and rear angle pieces.  To prevent a 
side-to-side movement required an 8 inch wide piece of scrap aluminum plate 
bolted to the rear vertical posts.  This is easy to do as there are a plethora 
of precision spaced holes available.
There was some very serious thought given to the vertical post design.  It has 
six 90 degree folds done in such a way that the inner edge on each outer side 
gives a 19 inch opening.
  However behind it is as inner fold where one can install recessed L shaped 
brackets. Now the inner fold is about and inch narrower than the outside 
edge.This allows making a wider shelf that can *float* on top the brackets but 
can't slide out either end.
This was very useful when configuring the instrument arrangement.
I also found that with the bottom shelf being just 6 inches above the floor I 
was able to install more equipment in the same vertical space than in my 
previous normal sized equipment cabinet.
Another bonus with this type of configuration is that it's easier to keep the 
equipment cool and it's much lighter.
Regards,
Perrier

  



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Re: [time-nuts] Is there anyone local to me with an 8.5 digit multimeter?

[Wayne Holder]

Not that I'm an expert on this but, in the 10 Meg and 100 Meg ranges, I
believe a variety of issues, including the triboelectric effect, humidity
and surface contamination are going to be big factors, especially if you
expect to maintain anything close to 8.5 digit accuracy.

  https://ims-resistors.com/wp-content/uploads/2017/03/TN-006.pdf

Wayne

On Tue, Jun 11, 2019 at 11:05 AM Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:

> I'm located in Althorne, Essex (CM3 6DT). I'd like to get a couple of
> resistors (10 M and 100 M) measured on an 8.5 digit meter, then compare
> them to what a 34970A data acquisition unit says. I don't want to spend a
> fortune on very high-end resistors, so bringing the unit to a 3458A, and
> measuring the resistor on two meters reasonably close in time, should be
> enough.
>
> There are some issues with these data acquisition meters, which impacts
> their stability. It does not help the fact that there's no S/N on it, so i
> don't now if it has any particular fault.
>
> --
> Dr David Kirkby Ph.D C.Eng MIET
> Kirkby Microwave Ltd
> Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
> Essex, CM3 6DT, United Kingdom.
> Registered in England and Wales as company number 08914892
> https://www.kirkbymicrowave.co.uk/
> Tel 01621-680100 / +44 1621-680100
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>
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Re: [time-nuts] Is there anyone local to me with an 8.5 digit multimeter?

[Dr. David Kirkby]

On Tue, 11 Jun 2019 at 17:54, Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:

> I'm located in Althorne, Essex (CM3 6DT). I'd like to get a couple of
> resistors (10 M and 100 M) measured on an 8.5 digit meter .
>

I apologise - I posted this to the time-nuts group, when it was intended to
go to volt-nuts!

For those that don’t know, volt-nuts is a sister group, for want of a
better expression

https://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com

devoted to account measurements of voltage and related topics.

I would suggest that anyone wishing to comment on my post should join
volt-nuts and add their comments there.

Dave.
-- 
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
https://www.kirkbymicrowave.co.uk/
Tel 01621-680100 / +44 1621-680100
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Re: [time-nuts] ZED-F9T

[Bob kb8tq]

Hi

So about three weeks later, Digikey shows no sign at all of ever having sold 
the F9T.
it does not even pop up as “obsolete”. The F9P and the eval kit for the F9P are 
still up there
in stock and chugging along …..

It’s a strange world out there ….

Bob

> On May 14, 2019, at 3:24 AM, Julien Goodwin  
> wrote:
> 
> On 10/5/19 2:21 am, Bob kb8tq wrote:
>> Digikey now shows the uBlox F9T in stock (250 pieces worth). The F9P also is 
>> back in stock.
>> Pricing is identical on both parts. No eval kits for the F9T showing yet. 
>> The F9P eval  (C099-F9P)
>> is still listed at $50 more than the single piece price for a F9P module 
>> (and you get a free USB cable
>> with the eval kit …..we all need more of those :) ).
> 
> uBlox sent an announcement on the weekend saying they were increasing
> what they have available on Digikey, and making it available outside the
> US too.
> 
> Great for someone like me in Australia, especially since essentially all
> my other parts come from Digikey.
> 
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