Date   
Re: TekWiki Helper Idea. Brainstorm or Washout?

jafinch78 .
 

Great idea.

I'd add some sort of reviewer commenting or track changes, like in MS Word, functionality so everyone can see who made changes and why. Kind of like a document change control process to prevent errors and/or elaborate on details.

Re: OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

Erik Hultine
 

Or "land" a seaplane.


“The snake which cannot cast its skin has to die.”- Friedrich Nietzsche

-----Original Message-----
From: "KeepIt SimpleStupid via Groups.Io" [keepitsimplestupid=yahoo.com@groups.io]
Date: 26/02/2018 01:25
To: TekScopes@groups.io
Subject: Re: [TekScopes] OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

I still want to know why you drive on a parkway and park in a driveway?

Re: TekWiki Helper Idea. Brainstorm or Washout?

Erik Hultine
 

Excellent idea!

Erik


“The snake which cannot cast its skin has to die.”- Friedrich Nietzsche

-----Original Message-----
From: "Michael A. Terrell" [mike.terrell@...]
Date: 26/02/2018 00:27
To: TekScopes@groups.io
Subject: Re: [TekScopes] TekWiki Helper Idea. Brainstorm or Washout?

My thoughts are: You first see if there are any options listed for an item. If not, or you find one not listed have an FTP upload area to submit it as a either a plain text file, or use a fill in the blanks template that can be reviewed and added to the existing wiki. That takes the heavy lifting of the research off of Kurt's back.

-----Original Message-----
From: Dennis Tillman W7PF <@Dennis_Tillman_W7pF>
Sent: Feb 25, 2018 10:26 PM
To: TekScopes@groups.io
Subject: [TekScopes] TekWiki Helper Idea. Brainstorm or Washout?

Michael Terrell had an interesting idea that might save us time but as near as I can tell it would only make a lot more work for Kurt at TekWiki.
Michael's idea was to list the options for each model on TekWiki.

The more general question is what would it take to list every option for every instrument on Kurt's web site. I know Kurt doesn't have the time. He has a full time job already. I doubt anyone on this forum has that much time to spare. I don't.

That started me thinking what it would take to do this. There are 40+ years of catalogs from 1965 to 2005 that Kurt roughly covers the products from right now. Each catalog has anywhere from 100 (the 1960's) to <1000 instruments (the 2000's). Each description has a section at the end with the options and their descriptions. The option number and description would have to be logged, then incorporated into each of Kurt's web pages. My best guess is it would take 1 man-year of work on the part of a college student majoring in electronics.

So here is my question: How much could we as an organization raise to give Kurt a helper to really speed him up? Is this even a possibility?

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Michael A. Terrell
Sent: Sunday, February 25, 2018 3:50 PM

It would be nice to list the known options for each model on Tekwiki, to save people time in the future.

-----Original Message-----
From: Kevin Oconnor <@KO3Y>

In my recollection Tek had obscure option numbers for custom phosphors on some scopes. I wonder if this is the case.
What is your phosphor color/persistence? My std 485 is blueish and fast.

Michael A. Terrell




--
Dennis Tillman W7PF
TekScopes Moderator



Michael A. Terrell

Re: OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

KeepIt SimpleStupid
 

I still want to know why you drive on a parkway and park in a driveway?

Re: OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

Adrian
 

Because you must always short things in one direction or it won't work of course, just like if you connect speakers so the +ve audio goes down a wire with black insulation and the -ve audio goes down the wire with red insulation it will sound terrible!

Tricky little things these electrons, they know a lot more than most people give them credit for ...or perhaps because Pomona just use the same moulding tool for everything...?

Adrian

On 2/26/2018 7:22 AM, Erik Hultine wrote:
Does Pomona know something about shorting bars that I don't?

Was I using them wrong half of the time if I wasn't paying attention to
their orientation?

Does anyone pay attention to the polarity of a shorting bar?

Re: Re-introduction to the group

Tom Gardner
 

On 26/02/18 02:59, Dennis Tillman W7PF wrote:
Hi Brian,
I think you should look elsewhere for the source of your access problem. There is no blacklist.

Years ago I discovered the benefit of having two completely different browsers on my desktop so I could eliminate them as the source of slowdowns, access problems, or apparent internet outages.

It also helps to have two different operating systems you can use if you suspect a web site or email that may have a virus.
If you are going down that route, you might as well go the whole hog and use a US military system designed to avoid the operating system and browser being compromised. There are obvious disadvantages, so I only use it for occasional internet banking sessions.

From the website https://www.tens.af.mil/lipose.htm ...

Trusted End Node Security (TENS^™ ) creates a secure end node from trusted media on almost any Intel-based computer (PC or Mac). TENS^™ boots a thin Linux operating system from removable media without mounting a local hard drive. Administrator privileges are not required; nothing is installed. TENS^™ turns an untrusted system (such as a home computer) into a trusted network client. No trace of work activity or malware can be written to the local computer. Simply plug in your USB smart card reader to access CAC <https://en.wikipedia.org/wiki/Common_Access_Card> and PIV <https://en.wikipedia.org/wiki/Personal_Identity_Verification>-restricted US government websites.

TENS^™ differs from traditional operating systems in that it isn't continually patched. TENS^™ is designed to run from read-only media and without any persistent storage. Any malware that might infect a computer can only run within that session. A user can improve security by rebooting between sessions, or when about to undertake a sensitive transaction. For example, boot TENS^™ immediately before performing any online banking transactions. TENS^™ should also be rebooted immediately after visiting any risky websites, or when the user has reason to suspect malware might have been loaded. In any event, rebooting when idle is an effective strategy to ensure a clean computing session.

TENS^™ is updated on a regular basis. Be sure to update to the latest version to have the latest protection and most recent drivers.

Re: TekWiki Helper Idea. Brainstorm or Washout?

Michael A. Terrell
 

My thoughts are: You first see if there are any options listed for an item. If not, or you find one not listed have an FTP upload area to submit it as a either a plain text file, or use a fill in the blanks template that can be reviewed and added to the existing wiki. That takes the heavy lifting of the research off of Kurt's back.

-----Original Message-----
From: Dennis Tillman W7PF <@Dennis_Tillman_W7pF>
Sent: Feb 25, 2018 10:26 PM
To: TekScopes@groups.io
Subject: [TekScopes] TekWiki Helper Idea. Brainstorm or Washout?

Michael Terrell had an interesting idea that might save us time but as near as I can tell it would only make a lot more work for Kurt at TekWiki.
Michael's idea was to list the options for each model on TekWiki.

The more general question is what would it take to list every option for every instrument on Kurt's web site. I know Kurt doesn't have the time. He has a full time job already. I doubt anyone on this forum has that much time to spare. I don't.

That started me thinking what it would take to do this. There are 40+ years of catalogs from 1965 to 2005 that Kurt roughly covers the products from right now. Each catalog has anywhere from 100 (the 1960's) to <1000 instruments (the 2000's). Each description has a section at the end with the options and their descriptions. The option number and description would have to be logged, then incorporated into each of Kurt's web pages. My best guess is it would take 1 man-year of work on the part of a college student majoring in electronics.

So here is my question: How much could we as an organization raise to give Kurt a helper to really speed him up? Is this even a possibility?

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Michael A. Terrell
Sent: Sunday, February 25, 2018 3:50 PM

It would be nice to list the known options for each model on Tekwiki, to save people time in the future.

-----Original Message-----
From: Kevin Oconnor <@KO3Y>

In my recollection Tek had obscure option numbers for custom phosphors on some scopes. I wonder if this is the case.
What is your phosphor color/persistence? My std 485 is blueish and fast.

Michael A. Terrell




--
Dennis Tillman W7PF
TekScopes Moderator



Michael A. Terrell

Re: 7603 working .... then blank

Roger Evans
 

Ian,

What I meant in the Feb19th post when I wrote it was that the voltage between collector and emitter would be too low for the transistors to conduct the required curent. This was a mistake in my logic since in this circuit when the collector voltage (nominally +5V) drops the emitter voltage also drops until the transistor can conduct the current. Frankly a lot of my attempts to understand the interplay of the power supplies were wrong and are probably best ignored. At least I have learned a little even if I have confused things for you. Apologies.

Tracking down the 'short' circuit on +50V should not be too difficult, the first step is to isolate the various boards by unplugging the power in and power out ribbon cables, note the orientation but they should be marked with an arrow on the connector and on the PCB. In most cases the short circuit can be measured with the power off just using a multimeter to measure resistance between +50V and ground on each board. On the circuit schematics you are then looking for components connected between +50V and ground either directly or with very small value series resistors. Electrolytic capacitors are prime suspects, but you might find mechanical damage or a foreign object. If you have a suspect component then unsolder one lead and test the component again. If it is difficult to unsolder one end then you can at your discretion snip one lead, test, and remake the cut lead with some solder.

Regards,

Roger

Re: OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

Erik Hultine
 

From my experience as a design engineer working with contract assembly houses, not specifying an orientation for insertion of a given component will generate lots of questions. I'm guessing Pomona marks one end so orientation can be specified avoiding the delay of these questions. I have had to spec this for NP caps, smd resistors (orient so the printed ID is in a given direction), etc.

Erik


“The snake which cannot cast its skin has to die.”- Friedrich Nietzsche

-----Original Message-----
From: "Dennis Tillman W7PF" [@Dennis_Tillman_W7pF]
Date: 25/02/2018 23:03
To: TekScopes@groups.io
Subject: Re: [TekScopes] OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

3 questions that are bothering me:



I picked up several Pomona dual banana plug shorting bars at the Rickreall,
OR Swap meet 2 weeks ago.

I just noticed they have the usual tab sticking out on one side with the
abbreviation GND on it.

Does Pomona know something about shorting bars that I don't?

Was I using them wrong half of the time if I wasn't paying attention to
their orientation?

Does anyone pay attention to the polarity of a shorting bar?



Another thing: According to Mouser the Yaego 0 ohm resistors they sell are
specified at only 1%. How do they know?



Finally: Why are the buttons on the cash machine at the drive up window of a
bank in Braille?



Dennis Tillman W7PF

OT: Why is a Pomona Dual Banana Plug Shorting Bar Polarized

 

3 questions that are bothering me:



I picked up several Pomona dual banana plug shorting bars at the Rickreall,
OR Swap meet 2 weeks ago.

I just noticed they have the usual tab sticking out on one side with the
abbreviation GND on it.

Does Pomona know something about shorting bars that I don't?

Was I using them wrong half of the time if I wasn't paying attention to
their orientation?

Does anyone pay attention to the polarity of a shorting bar?



Another thing: According to Mouser the Yaego 0 ohm resistors they sell are
specified at only 1%. How do they know?



Finally: Why are the buttons on the cash machine at the drive up window of a
bank in Braille?



Dennis Tillman W7PF

Re: 7603 working .... then blank

tinkera123
 

Hi,

+50v PSU

Firstly, a correction to what I wrote yesterday ……. not all transistors are ON (you probably knew that already ….. 😊)
Q863 is ON (e -12.5, b -11.9, c -0.6)
Q860 is OFF (e -12.5, b -12.5, c 2.6)

Dave ….. how did you calculate Ve in your Post on Feb 23??? Estimated Ie???? Datasheet spec???

Roger … in your Post on Feb 19, you stated that Q860 and Q863 have very small Vce. Can you please explain that further??? Are you referring to the voltage available between e and c of approx. 55 volts in total??? Or a Datasheet spec????

CR875

Re-tested CR875 and then removed the various Plugs and re-tested.
The ‘short’ is ‘downstream’ of P971. After removing this Plug, CR875 measured normally as a Good diode.

Not sure if this is good news or not …. as I am unfamiliar with what is ‘downstream’ …. but I guess I am about to find out ….. 😊

Cheers,
Ian

Re: Re-introduction to the group

jafinch78 .
 

On Sun, Feb 25, 2018 at 07:13 pm, Jon Batters wrote:


Again, the 500-in-1 is great and has a large manual with it. I put my manual
in a large 10x20 , 3-ring binder so the pages lay out flat .
Hi Jon Batters,

Any way by chance you have a collating scanner available at the library around you where you can scan the document?

Scans are usually free and I'd pay you to scan a copy of the 500-in-1 manual. I'm thinking will be easy since you have in single page 3-ring binder format reads like.

I'm educated guessing that others will pay you for a PDF copy also.

Thanks in advance for your time and consideration Mr. Batters.

Re: Re-introduction to the group

jafinch78 .
 

On Sun, Feb 25, 2018 at 06:59 pm, Dennis Tillman W7PF wrote:


helps to have two different operating systems
I upgraded the laptop to SSD and installed Ubuntu 17.04 Zesty Zapus, then Skywave Linux (not successful due to pulse audio issue) and Windows 7 Professional. I don't like any Windows OS after 7 Ultimate pretty much from what I can tell. 10 may be suitable in the Professional or better version... I haven't tested enough though to assure stability of legacy applications running in virtual machines with different OS's.

The multi-boot option is flexible and highly recommended as long as there are drivers available. Custom modifying/hacking drivers to work is more challenging, though fun if you have the time. Be sure to run Boot Scan's also so the anti-infective software checks CMOS/bootloader if you suspect that type of issue. Great advice Dennis.

Re: Re-introduction to the group

jafinch78 .
 

On Sun, Feb 25, 2018 at 07:15 pm, Brian Bloom wrote:


It must be this God-forsaken outdated firefox browser, then.
On my laptop, using Chrome, I have to go into "Clear Browsing Data" occasionally and delete from the beginning of time the options available. Occasionally a power cycling of the computer is required and that is usually after I unplug and plug back in the USB WiFi Adapter... where the first two steps didn't resolve the connectivity issues.

You have the "United States National Radio Quiet Zone" in WV. Some day's I wish I had a diesel and could camp out down there to triangulate on whatever is infesting all my perimeter. Occasionally; I might have a virus, malware, spyware, trojan or something software related infesting the computer... though that hasn't happened in a while... especially after complaining to the FBI et.al Cyber Crimes Division with I'm guessing Battle Creek support as I complained to the USAF OIG and OSI et.al.

Re: TekWiki Helper Idea. Brainstorm or Washout?

Erik Hultine
 

A YEAR OR SO AGO I WENT THROUGH ALL THE CATALOGS AT THE VINTAGETEK MUSEUM CONTAINING THE 485 SCOPE LOOKING FOR OPTION 93. NO OCCURANCE.
SO EVEN WITH THIS SUGGESTED PROJECT NOT ALL OPTIONS WILL BE FOUND.

ERIK

“The snake which cannot cast its skin has to die.”- Friedrich Nietzsche

-----Original Message-----
From: "Dennis Tillman W7PF" [@Dennis_Tillman_W7pF]
Date: 25/02/2018 19:28
To: TekScopes@groups.io
Subject: Re: [TekScopes] TekWiki Helper Idea. Brainstorm or Washout?

Michael Terrell had an interesting idea that might save us time but as near as I can tell it would only make a lot more work for Kurt at TekWiki.
Michael's idea was to list the options for each model on TekWiki.

The more general question is what would it take to list every option for every instrument on Kurt's web site. I know Kurt doesn't have the time. He has a full time job already. I doubt anyone on this forum has that much time to spare. I don't.

That started me thinking what it would take to do this. There are 40+ years of catalogs from 1965 to 2005 that Kurt roughly covers the products from right now. Each catalog has anywhere from 100 (the 1960's) to <1000 instruments (the 2000's). Each description has a section at the end with the options and their descriptions. The option number and description would have to be logged, then incorporated into each of Kurt's web pages. My best guess is it would take 1 man-year of work on the part of a college student majoring in electronics.

So here is my question: How much could we as an organization raise to give Kurt a helper to really speed him up? Is this even a possibility?

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Michael A. Terrell
Sent: Sunday, February 25, 2018 3:50 PM

It would be nice to list the known options for each model on Tekwiki, to save people time in the future.

-----Original Message-----
From: Kevin Oconnor <@KO3Y>

In my recollection Tek had obscure option numbers for custom phosphors on some scopes. I wonder if this is the case.
What is your phosphor color/persistence? My std 485 is blueish and fast.

Michael A. Terrell




--
Dennis Tillman W7PF
TekScopes Moderator

TekWiki Helper Idea. Brainstorm or Washout?

 

Michael Terrell had an interesting idea that might save us time but as near as I can tell it would only make a lot more work for Kurt at TekWiki.
Michael's idea was to list the options for each model on TekWiki.

The more general question is what would it take to list every option for every instrument on Kurt's web site. I know Kurt doesn't have the time. He has a full time job already. I doubt anyone on this forum has that much time to spare. I don't.

That started me thinking what it would take to do this. There are 40+ years of catalogs from 1965 to 2005 that Kurt roughly covers the products from right now. Each catalog has anywhere from 100 (the 1960's) to <1000 instruments (the 2000's). Each description has a section at the end with the options and their descriptions. The option number and description would have to be logged, then incorporated into each of Kurt's web pages. My best guess is it would take 1 man-year of work on the part of a college student majoring in electronics.

So here is my question: How much could we as an organization raise to give Kurt a helper to really speed him up? Is this even a possibility?

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Michael A. Terrell
Sent: Sunday, February 25, 2018 3:50 PM

It would be nice to list the known options for each model on Tekwiki, to save people time in the future.

-----Original Message-----
From: Kevin Oconnor <@KO3Y>

In my recollection Tek had obscure option numbers for custom phosphors on some scopes. I wonder if this is the case.
What is your phosphor color/persistence? My std 485 is blueish and fast.

Michael A. Terrell




--
Dennis Tillman W7PF
TekScopes Moderator

Re: Re-introduction to the group

Brian Bloom
 

Dennis,

It must be this God-forsaken outdated firefox browser, then. I tried to access the group with the same computer and browser over a period of several days and kept getting a 'kitten' maintenance message. It was only when I tried on my laptop that I realized something was wrong. It'll give me access through a private window on the same PC and browser, though.

I think I need Linux back in my life, especially now that I'm on computers more often!

Brian

Re: Re-introduction to the group

Jon Batters
 

Hi Brian, Go to cpcares.com , select elenco : They have multiple Lab-Kits from $30 to $215. Even the cheap units are good to have. Any unit would be good to have including the Knight you found. Again, the 500-in-1 is great and has a large manual with it. I put my manual in a large 10x20 , 3-ring binder so the pages lay out flat . I have large 14x22 clear mylar sheets I cut down for Chapter/ Section dividers so the sheets don't get torn up by flipping big pages to & fro.

Re: Tektronix 485 option 93 (what is it?)

 

Hi Kevin,

No, that isn't the case. Options are ALWAYS listed in the catalogs. Mods
NEVER are. It is almost impossible to track down what a Mod does but it is
always easy to figure out what an option is. Just look it up in the catalog.
It is possible than an option was not offered for all the years a product
appeared in the catalogs. To determine that you have to look through all
those catalogs.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Kevin
Oconnor
Sent: Sunday, February 25, 2018 3:21 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix 485 option 93 (what is it?)

In my recollection Tek had obscure option numbers for custom phosphors on
some scopes. I wonder if this is the case.
What is your phosphor color/persistence? My std 485 is blueish and fast.

Sent from kjo iPhone




--
Dennis Tillman W7PF
TekScopes Moderator

Re: Re-introduction to the group

 

Hi Brian,
I think you should look elsewhere for the source of your access problem. There is no blacklist.

Years ago I discovered the benefit of having two completely different browsers on my desktop so I could eliminate them as the source of slowdowns, access problems, or apparent internet outages.

It also helps to have two different operating systems you can use if you suspect a web site or email that may have a virus.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Brian Bloom via Groups.Io
Sent: Sunday, February 25, 2018 1:15 PM
Subject: Re: [TekScopes] Re-introduction to the group

<snip>
I don't know if I got 'blacklisted' or not, but this is the first time in several days that my browser has allowed me to access the group. If I was blacklisted, I'd be appreciative if the moderator would remove me from that list!! I have no intentions of being a nuisance here, only a participant while I venture through my electronics learning endeavors.

Brian



--
Dennis Tillman W7PF
TekScopes Moderator