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Re: Removing label adhesive from instrument windows?

 

I agree with Daun. IPA will fog some plastics, but naptha
doesn't in my experience. WD40 is mostly Stoddard solvent,
which is similar to naptha.

Avoid any of the spray cleaners, like Whistle, 409, and
others that contain butyl cellosolve, as they will soften
the plastic, and may cloud it as they let the mastic
melt away the plastic.

-Chuck Harris

Daun Yeagley wrote:

Brad, I've found that Naptha (AKA Ronson lighter fluid) works very well for this.

Daun
Daun E. Yeagley II, N8ASB
On 9/5/2019 11:35 AM, Brad Thompson wrote:
Hello--

I purchased a digital multimeter at an estate sale. Unfortunately,
the seller affixed a sticky-backed price label to the meter's
transparent-plastic display window. Most of the label peeled away but the adhesive
remains. Short of mechanically scraping away the residue and damaging the
window, does anyone have a suggestion for a label-removing solution that
won't attack the plastic?

Thanks, and 73--

Brad AA1IP

P.S.: if a chemist discovered the perfect solvent that would dissolve anything
and everything, how would it be packaged for sale?<g>
Re: Removing label adhesive from instrument windows?

 

¿ªÔÆÌåÓý

And, of course, use a plastic tool to scrape it off.? John K1AE

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On 2019-09-05 11:40 am, amirb wrote:

first heat it up with hot air gun and under the hot air try to slowly peel it off as much as possible
most of the time it comes off completely leaving some sticky residue
then use a lot of IPO to clean it?
Re: Removing label adhesive from instrument windows?

 

Brad, I've found that Naptha (AKA Ronson lighter fluid) works very well for this.

Daun
Daun E. Yeagley II, N8ASB

On 9/5/2019 11:35 AM, Brad Thompson wrote:
Hello--

I purchased a digital multimeter at an estate sale. Unfortunately,
the seller affixed a sticky-backed price label to the meter's
transparent-plastic display window. Most of the label peeled away but the adhesive
remains. Short of mechanically scraping away the residue and damaging the
window, does anyone have a suggestion for a label-removing solution that
won't attack the plastic?

Thanks, and 73--

Brad? AA1IP

P.S.: if a chemist discovered the perfect solvent that would dissolve anything
and everything, how would it be packaged for sale?<g>
Re: Removing label adhesive from instrument windows?

 

first heat it up with hot air gun and under the hot air try to slowly peel it off as much as possible
most of the time it comes off completely leaving some sticky residue
then use a lot of IPO to clean it?
Re: Removing label adhesive from instrument windows?

 

¿ªÔÆÌåÓý

try dabbing the label with a cotton ball with ample WD-40. I have found it to work miracles and never affected the underlying plastic.

Gedas, W8BYA

Gallery at 
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 9/5/2019 11:35 AM, Brad Thompson wrote:

Hello--

I purchased a digital multimeter at an estate sale. Unfortunately,
the seller affixed a sticky-backed price label to the meter's
transparent-plastic display window. Most of the label peeled away but the adhesive
remains. Short of mechanically scraping away the residue and damaging the
window, does anyone have a suggestion for a label-removing solution that
won't attack the plastic?

Thanks, and 73--

Brad? AA1IP

P.S.: if a chemist discovered the perfect solvent that would dissolve anything
and everything, how would it be packaged for sale?<g>




Removing label adhesive from instrument windows?

 

Hello--

I purchased a digital multimeter at an estate sale. Unfortunately,
the seller affixed a sticky-backed price label to the meter's
transparent-plastic display window. Most of the label peeled away but the adhesive
remains. Short of mechanically scraping away the residue and damaging the
window, does anyone have a suggestion for a label-removing solution that
won't attack the plastic?

Thanks, and 73--

Brad? AA1IP

P.S.: if a chemist discovered the perfect solvent that would dissolve anything
and everything, how would it be packaged for sale?<g>
Re: HP8562A

 

I remember having used Dual gate DMos fets in a 2m converter. It was considered state of the art over conventional dual gate mosfets like 40673. SD211 are single gate DMos fets....
Best 73,

Harke

(Send from my iPad4)

Op 5 sep. 2019 om 01:42 heeft Peter Gottlieb <hpnpilot@...> het volgende geschreven:

I have a bunch of SD211DE and some SD214DE. I wonder what both of those are used in/for.


Peter

On Sep 4, 2019, at 6:56 PM, Paul Amaranth <paul@...> wrote:

That crosses to an SD215. Future Electronics has 131 of those in stock at
a little over $5 apiece.

If you haven't found it already, there's an HP/JDEC reference available.
Sphere has one:


That's pretty useful.

On Wed, Sep 04, 2019 at 01:18:46PM -0700, pa0vtw@... wrote:
I'm looking for 2 mosfets, Q204 and Q206 for my spectrum analyzer or is there anybody who knows a replacement for them.

The mosfets are on the A2 board of the analyzer.

HP part number: 1855-0241 transistor mosfet n-chan. Emode TO72SI

Thanks in advance.





!DSPAM:5d7029f9244012026219676!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows

Re: HP 85044A T/R test set part - Cabinet Trim "zipper" - 08502-20007 - source or 3D printed copy?

 

(CORRECTION - noticed a typo in the powerpoint image, corrected version attached. The height (above bottom) shallow section (the lower part, between the teeth) is 1.55mm, not 1.5mm. Please look at the attached version instead ("zipper 4.ppt".)

On Thu, Sep 5, 2019 at 06:00 AM, David Feldman wrote:


I overlooked the following comment -

" I don't have an 85044A; would it be convenient for you to type up a
textual description of the shape with measurements? I can bang it up in
OpenSCAD quickly and you can check it out, and use it if it works for
you, or not. That's something that I can do in a few minutes."

The file zipper.zip is a sketch in powerpoint of one "tooth" of the zipper,
looking end-on. The zipper is formed by a pair of the two cross-sections
shown, making up a tooth, then replicated 48 times to make an object
which is slightly longer than the 85044A is deep (front-to-back.)

Please let me know if this sketch makes sense?

Thank you.

zipper 4.ppt
zipper 4.ppt

Re: HP 85044A T/R test set part - Cabinet Trim "zipper" - 08502-20007 - source or 3D printed copy?

 

I overlooked the following comment -

" I don't have an 85044A; would it be convenient for you to type up a
textual description of the shape with measurements? I can bang it up in
OpenSCAD quickly and you can check it out, and use it if it works for
you, or not. That's something that I can do in a few minutes."

The file zipper.zip is a sketch in powerpoint of one "tooth" of the zipper,
looking end-on. The zipper is formed by a pair of the two cross-sections
shown, making up a tooth, then replicated 48 times to make an object
which is slightly longer than the 85044A is deep (front-to-back.)

Please let me know if this sketch makes sense?

Thank you.

zipper.ppt
zipper.ppt

Re: HP 85044A T/R test set part - Cabinet Trim "zipper" - 08502-20007 - source or 3D printed copy?

 

Attached is an updated version (zipper 4.stl, zipper 4.zip.) The longitudinal gaps in two places (at the 1/3 and 2/3 way point along the length) in zipper 3 that appeared as overlaps in tinkercad appear corrected.(by making them overlap further 0.2 mm.) I do not plan to continue with autodesk tinkercad, as it's not a suitable design tool.

FYI the ".zip" format is one of the two export formats offered by tinkercad (a reply post had commented about this). I don't know of what use the zip format is in this case (re-loading it to tinkercad didn't preserve the groupings I used to step-and-repeat the underlying box set that makes a "tooth"), however, it was offered as a format on tinkercad, so I have included it here.

The only printing material available at the university library I use is somewhat brittle (the zipper can easily be broken apart by bending it at a point along the length); slightly more pliable material would probably be preferable, but that's not available at the library I used.

zipper 4.stl
zipper 4.stl
zipper 4.zip
zipper 4.zip

Re: Unknown Device.

 

Yes it really is very old device .... like me. Hi, Hi..
Thank you.

Rafael EA7HWX
Re: Unknown Device.

 

Hi Robert,

It is an interesting device, at least I will test it. At the moment it will remain in the drawer.

Best Regards.

Rafael EA7HWX
Re: Unknown Device.

 

Hi Piet,
I am very grateful for the pdf on the device.
Now I can prove it with a guarantee not to destroy it. He has been so many years without trying for this reason.
I've been remembering, and I think this bolometer was in an "Argos" electronic warfare unit. They left the base of Rota in the 1st war of the Persian Gulf. (80s) to scrap because they installed more modern equipment to the AWACS. They told me all this because I only bought in the scrap yard.
The equipment was basically a receiver up to 18Ghz with Polar screen representation.
Inside the unit was a Tunnel diode amplifier and a lot of good material.
What a good scrap that one! That has not happened again.

Best Regards,

73's

Rafael
EA7HWX

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Re: Unknown Device.

 

Nope,
It's a single element. The HP 431/432 uses a dual element in a bridge configuration.

Robert G8RPI.
Re: spectrum HP 8558b good but missing part

 

¿ªÔÆÌåÓý

Oh joy! The wonders of 20:20 hindsight!

I suspect that the HP engineers who designed these components did not have the benefit of your 500 years experience in the design and manufacture of plastics components.

When I did my engineering degree, plastics were looked down on as cheap Japanese rubbish. But since then, scientists have done a great deal of work to develop better plastics. Just look at the development of poly-vinyl-chlorides. They¡¯ll keep electricians in business for years as the old PVC wiring fails.

73 de Brian, VK2GCE.

?

On Thursday, 5 September 2019 2:53 AM, Greg chuntered:

John,

If yo ever succeed in obtaining the Tech Etch finger stock, it is of the exact dimensions as the HP part.? The only difference is in thew bend angle of the fingers in relation to the mounting portion of the stock which will require a little bending to match.

You are correct in your view of the poorness of the switch design.? HP should not have relied upon such a tiny dimension of the heat staked plastic to secure the fingers to the switch rotor.? We all know that plastic will become brittle over the years as the plasticizer slowly disperses over time.

Greg

Re: HP8562A

 

I have a bunch of SD211DE and some SD214DE. I wonder what both of those are used in/for.


Peter

On Sep 4, 2019, at 6:56 PM, Paul Amaranth <paul@...> wrote:

That crosses to an SD215. Future Electronics has 131 of those in stock at
a little over $5 apiece.

If you haven't found it already, there's an HP/JDEC reference available.
Sphere has one:


That's pretty useful.

On Wed, Sep 04, 2019 at 01:18:46PM -0700, pa0vtw@... wrote:
I'm looking for 2 mosfets, Q204 and Q206 for my spectrum analyzer or is there anybody who knows a replacement for them.

The mosfets are on the A2 board of the analyzer.

HP part number: 1855-0241 transistor mosfet n-chan. Emode TO72SI

Thanks in advance.





!DSPAM:5d7029f9244012026219676!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows


[test-equip-trader] 8720D VNA¡­ still trying

Pete Manfre
 



Selling my 8720D lcd color vna.? ?20ghz,? has 010 (tdr),? working as it should.? Will include hp 26GHz cal kit (85052¡­ open,? short,? load) and pair of 3.5mm Gore phaseflex vna 48" cables. ¡­??$6500?+ ship

Pete wa2odo

IMG_20190724_204811389-1600x1200.jpg
IMG_20190724_155716797-1600x1200.jpg
IMG_20190724_155723684-1600x1200.jpg
IMG_20190724_155735702-1600x1200.jpg
IMG_20190724_155750037-1600x1200.jpg

Re: Finger Stock - spectrum HP 8558b good but missing part

 

I seem to recall using some of that stuff to replace the missing contacts on my 8569B SA

Jim


On Wednesday, September 4, 2019, 7:33:38 AM PDT, Gedas <w8bya@...> wrote:


Not sure if this will help you or others but I have several NOS in sealed bags 300" lengths of Tech-Etch finger stock, 187P28-300-09

A PDF that describes the physical dimensions of the fingers is in the following document although the coating of mine with be different. I have the -09 coating which is a shiny nickel (I think) vs bare copper etc. The last two digits describe the coating etc. If you need some contact me off line.

Gedas, W8BYAGallery at Light travels faster than sound....This is why some people appear bright until you hear them speak.
On 9/4/2019 12:10 AM, Greg Muir via Groups.Io wrote:

Exact replacement finger stock in strip form:

Tech Etch part number 75RE

The problem is obtaining it in small quantities.? They only normally stock it in the the Beryllium copper material.? Stainless steel is a special order.

Greg

Re: HP8562A

 

That crosses to an SD215. Future Electronics has 131 of those in stock at
a little over $5 apiece.

If you haven't found it already, there's an HP/JDEC reference available.
Sphere has one:


That's pretty useful.

On Wed, Sep 04, 2019 at 01:18:46PM -0700, pa0vtw@... wrote:
I'm looking for 2 mosfets, Q204 and Q206 for my spectrum analyzer or is there anybody who knows a replacement for them.

The mosfets are on the A2 board of the analyzer.

HP part number: 1855-0241 transistor mosfet n-chan. Emode TO72SI

Thanks in advance.





!DSPAM:5d7029f9244012026219676!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows
Re: Unknown Device.

 

¿ªÔÆÌåÓý

I wonder if it would work as an input device to a HP431.

Regards,

?

Stephen Hanselman

Datagate Systems, LLC




On Sep 4, 2019, at 14:48, pa0vtw@... wrote:

Here is a better picture of the page I sent earlier. I hope this helps.

73"

Piet
<Scan10008.png>
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