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Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

The E8663D
Re: VNA Resonance Methodology

 

This is a nice post. I'm learning interesting tricks. Maybe re-learning but that's what "going back to fundamentals" means no?
Cheers to all,
Renaud
Re: Sticky ink of schematics

 

Will do. An update, I found exactly what to call this courtesy of someone from EEVblog. Was found thru searching "toner" in the old threads.
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I've currently stopped any separation on my part to see what options I can take. Also I'm in the Houston area in Texas. Some of the stuff was stored in a neighboring state. For the most part it gets hot and humid but can get snow/frost. I suspect heating from many summers in a warehouse did this.
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-Lex
Re: Sticky ink of schematics

 

On Mon, Nov 25, 2024 at 02:02 PM, Lexter Negron wrote:
Any tips and tricks
I don't know which city you are in.
But, many cities, especially big ones, have a public Archive, staffed with professional archivists.
I guess... mileage will vary, on the 'experts' ... but I found the archivists, in my city, very knowledgeable about 'recovering' and 'prep-ing' old, and damaged, documents, for scanning.
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There are some journals, and monographs, I am aware of; but a professional archivist would know better.
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Besides using the kind of 'gentile' mechanical separation, using thin spatulas, or specialized bone tools... sort of... like you are doing...
One technique for separating pages, I know of, is to use of a 'humidity chamber.'
Another is freezing.
Both sometimes work... but not always... so it's best to experiment first.
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If the pages are damaged, or the ink is damaged, to begin with, or during separation... sometimes the paper can be reinforced with Japanese tissue paper (conservation paper) and 'wheat starch paste.'
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Re: Sticky ink of schematics

 

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I¡¯m simultaneously posting this on the eevblog for solutions. It¡¯s bad when I come to the foldouts. :/ I have significantly better luck with separate pages. Especially if they don¡¯t have print on both sides. This is a HP CLIP btw. Using a plastic spatula meant for walls or deicing a fridge.
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-Lex
Re: VNA Resonance Methodology

 

Er..., yes, That's the other thing I got wrong. I've made 49 turns close wound, so I'm screwed on the overall length, the number of turns and the Q. Par for the course for a first attempt (of a young child!) Perhaps I'll measure the inductance alone just out of curiosity and see how far out I got it from the intended value.
I really must try harder. :(
Re: 6632B supply stuck in PROT mode, unable to reset.

 

OV is for over voltage. That will allow you to follow the troubleshooting flow chart.


On Sun, Nov 24, 2024, 11:29 PM Michael - AF7U via <michael.rosanbalm=[email protected]> wrote:
I forgot to mention, the values for voltage match what I read on the output pins on the PCB.
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Re: VNA Resonance Methodology

 

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I tapped in your coil dimensions into some old software, and with a 31mm former you would need about 42 turns of? 0.4mm wire closed wound to get about 50uH using a 20mm long former.
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The Q at 1.45 MHz is not that great at about 130. The software below allows any parameter to be edited and so the Q curve and all the data gets updated in real time after each change to the design (turns, diameter, length etc).
It usually produces good results as it's based on the classic tables and graphs for solenoid design. It also uses the classic equations for Q.
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Re: VNA Resonance Methodology

 

If half the length (while holding everything else constant), then you get about twice the inductance, so your resonant frequency will be about 70% what you targeted.

It is best in general to space the windings apart by something similar to the wire diameter. In the frequency range you're looking at, you'll about double the Q if you do so.

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 11/25/2024 5:38 PM, Jinxie via groups.io wrote:
I think this is where I may have gone wrong. I'm winding this on a 31mm diameter paxoline former with no core as per the formulas. The wire is 0.4mm and the overall length of the solenoid should have been 20mm. Mine was less than half that as I'd wound the turns touching (yes, they are varnished). That must have thrown the calcs out. Not sure how I made such an oversight but there it is.
Re: VNA Resonance Methodology

 

I think this is where I may have gone wrong. I'm winding this on a 31mm diameter paxoline former with no core as per the formulas. The wire is 0.4mm and the overall length of the solenoid should have been 20mm. Mine was less than half that as I'd wound the turns touching (yes, they are varnished). That must have thrown the calcs out. Not sure how I made such an oversight but there it is.
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-J.
File /All HP, Agilent and Keysight instruments in folders by part numbers/5000 to 5999/HP_5315A_Operating_and_Service_Manual.pdf uploaded #file-notice

Group Notification
 

The following items have been added to the Files area of the [email protected] group.

By: jack <jfrazer716@...>

Description:
HP 5315A operating and service manual
Re: VNA Resonance Methodology

 

To avoid disappointment with the Q that you achieve on your initial attempt, it might be worth it to list what inductance you want and what Q you would be happy with at 1.45 MHz.?
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If I assume 50uH and about 250pF for your resonator, I think you would have to make something quite large if you were hoping for a high Q at 1.45 MHz from a classic air cored 50uH solenoid.?
This assumes you are using enamelled copper wire of maybe 1mm diameter. Having close wound turns makes the winding easier but it will obviously produce a lower Q.
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You could always use Litz wire if this is practical for you as this should boost the Q quite a lot at 1.45 MHz even with close wound?turns.
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The other alternative would be to use a ferrite core based inductor. It should be possible to get a Q of about 400 at 1.45 MHz with a small ferrite core inductor with about 50uH inductance. But this won't be suitable for large signal operation.
Sticky ink of schematics

 

Hello, I want to scan and save forever schematics I recently found from a warehouse. The problem is the ink. Storage conditions for decades are unknown but I assume this wasn¡¯t kept in an air conditioned environment. It wasn¡¯t exposed directly to a flood so at least I have that going for me. However, hot and cold with possible humidity in the mix for decades will still take a toll. Any tips and tricks on how to separate papers from themselves or it¡¯s plastic cover without lifting the ink?
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-Lex
Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

I spotted my mistake as well.
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The only 10811- I had in my junk box was a -60111 but I decided to try it
in spite of not being specified for PN anyway.
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I also decided to replace a few capacitors around the POL regulator
on the interface board.
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Before and after the steps above, I listended to a carrier using a 145 MHz
FM radio for hum and noise.
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I also used a 89441 in spectrogram mode and could verify that
the power line frequency noise present close to the carrier when testing
before modifications was gone.
Also a sort of "random noise bursts" around the carrier
which could be seen at first was gone as well.
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It would be intersting to know what types HP replaced the 8662A/8663A
with when they were discontinued.
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Ulf
SM6GXV
Re: HP 8341B 1992 firmware version

 

Hello,
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You can find it here:
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Regards
Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

It has a looser spec than the standard 10811D/E:
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Ref https://www.febo.com/pages/hp10811/HP10811-Specs.pdf
Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

The OCXO part number is 08662-60085 not 10811-60085
This is the part number for a rebuilt 10811-60111
Hope this helps
Re: VNA Resonance Methodology

 

And if you want to do a first-order correction for fringing, replace the length with [length + 0.9*radius]. This correction is important if the coil length is not very much greater than the radius. Harold Wheeler gave us this correction back in the 1920s. I find that the inductance calculated this way rarely deviates from measurements by more than a couple of percent for most practical coils, so Wheeler's is a very effective correction.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 11/25/2024 3:20 AM, Renaud F5ZR via groups.io wrote:
Hi Jinxie,
Back to the fundamentals!
L=n2.mu.S/l
With mu=1.26.10-6 as your inductor is on air?
S in sq meters
l in meters
Re: HP 10811-60085 (10 MHz OCXO) No hits when searching for data...

 

The basic OCXO is used in many products. Look at the 3325 A/B manual or the 53334 A/D manuals It may vave one of several interface boards The 3325 simply alows it to e chassis mounted, while the 5334A/b has an edge connector to pug it into the chassis. I am awaiting cataract surgery, so I will not attempt yo identify whicch version you have

A6 Control Assembly 03325-66506 is used in the 3325A/B but I dont have any tepair noyes on other modeless.

Here is the maual for the base model:

On Mon, Nov 25, 2024 at 9:31?AM Ulf Kylenfall via <ulf_r_k=[email protected]> wrote:
Forum,
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Trying to figure out what version of the 10811- oscillator
that has the suffix 60085 is, what is the spec it has
and what version that can replace it.
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This suffix -60085 is not listed when searching for data either
on the internet or in the 10811- manual.
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The oscillator sits in the 8663A rear and is the
reference oscillator for the signal generator.
(The instrument has the Ext VCO control input
option if that is of significance...)
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Ulf
SM6GXV
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HP 8341B 1992 firmware version

 

Dear Colleagues,
Would someone be able to send me the 1992 firmware files for the 8341B sweeper? Unfortunately, I can't find it anywhere.
Best regards,
Wojciech
3181 - 3200 of 151374