Date   

Re: Tek 475: square wave leading corners too rounded?

 

A calibrator is intended to check vertical accuracy, not waveshape.A rounded corner does not mean the freq response is off.Someone suggested it could be caused by the probes, which is certainly true.If you have another scope with a BNC calibrator, try hooking a coax up to that.
 HankC, Boston WA1HOS


Re: Yahoo is up for sale, get ready for a disaster...

 

Has anyone tried "PG Offline"?
http://www.personalgroupware.com/

After reading the sites description, it appears to work with the current Yahoo format and also
includes photos, files and attachments.

Would it make sense to split up the archive process between members to speedup up the process and reduce the downloads from any one IP address?

Richard Hall
WB4RSO


Re: Yahoo is up for sale, get ready for a disaster...

Tom Gardner
 

On 12/04/16 13:51, Stefan Trethan stefan_trethan@... [TekScopes] wrote:

I think you might want to reserve "TekScopes", just in case...
Too late (for https://groups.google.com/d/forum/tekscopes), I'm pleased to say :)

(No, I'm not going to do an "evil world-domination" cackle. Nor do I want to
administer the thing in long term)


Re: Yahoo is up for sale, get ready for a disaster...

Nathan Johnson
 

I am prepared to offer server space for any archive mirroring or file hosting needed. My servers have a solid uptime record, and I have plenty of available space.
Nathan KK4REY

Sent using CloudMagic Email [https://cloudmagic.com/k/d/mailapp?ct=pi&cv=7.4.15&pv=9.1&source=email_footer_2]

On Tue, Apr 12, 2016 at 15:51, Stefan Trethan stefan_trethan@... [TekScopes] <TekScopes@...> wrote:
I think you might want to reserve "TekScopes", just in case...
Google might be evil, but they sure know how to extract the maximum
amount of milk with the minimum amount of moo, so they are not like to
go belly up like Yahoo.

The BBC said web traffic / user count on Yahoo is actually in the same
ballpark as Google, but they just can't make money from it. Hard to
believe, their numbers might be wrong.

It seems there already is a Tektronix group on Google, but we might be
viewed as slightly off topic:

"Tektronix Ultimate Frisbee"
"Mailing list for coordinating Ultimate frisbee games at Tektronix,
Beaverton, OR"
Who'd have thought, at least now we know why Tek scopes have lost the
edge.... ;-)

ST

On Tue, Apr 12, 2016 at 2:32 PM, Michael Dunn md@...
[TekScopes] <TekScopes@...> wrote:
Anyone have experience with:
http://www.freelists.org/
?

Downside: no file space.

Otherwise:
https://groups.google.com/forum/#!overview


Wait and see...








------------------------- -----------
Posted by: Michael Dunn <md@...>
------------------------- -----------


------------------------- -----------

Yahoo Groups Links





[Non-text portions of this message have been removed]


Re: Yahoo is up for sale, get ready for a disaster...

 

Michael,


The google site looks good


Jerry Massengale

-----Original Message-----
From: Michael Dunn md@... [TekScopes] <TekScopes@...>
To: TekScopes <TekScopes@...>
Sent: Tue, Apr 12, 2016 7:32 am
Subject: [TekScopes] Re: Yahoo is up for sale, get ready for a disaster...






Anyone have experience with:
http://www.freelists.org/
?

Downside: no file space.

Otherwise:
https://groups.google.com/forum/#!overview

Wait and see...


Re: Yahoo is up for sale, get ready for a disaster...

stefan_trethan
 

I think you might want to reserve "TekScopes", just in case...
Google might be evil, but they sure know how to extract the maximum
amount of milk with the minimum amount of moo, so they are not like to
go belly up like Yahoo.

The BBC said web traffic / user count on Yahoo is actually in the same
ballpark as Google, but they just can't make money from it. Hard to
believe, their numbers might be wrong.

It seems there already is a Tektronix group on Google, but we might be
viewed as slightly off topic:

"Tektronix Ultimate Frisbee"
"Mailing list for coordinating Ultimate frisbee games at Tektronix,
Beaverton, OR"
Who'd have thought, at least now we know why Tek scopes have lost the
edge.... ;-)

ST



On Tue, Apr 12, 2016 at 2:32 PM, Michael Dunn md@...
[TekScopes] <TekScopes@...> wrote:
Anyone have experience with:
http://www.freelists.org/
?

Downside: no file space.

Otherwise:
https://groups.google.com/forum/#!overview


Wait and see...








------------------------------------
Posted by: Michael Dunn <md@...>
------------------------------------


------------------------------------

Yahoo Groups Links



Re: Yahoo is up for sale, get ready for a disaster...

Michael Dunn
 

Anyone have experience with:
http://www.freelists.org/
?

Downside: no file space.

Otherwise:
https://groups.google.com/forum/#!overview


Wait and see...


Re: Yahoo is up for sale, get ready for a disaster...

 

Looks like a good piece of SW, but rather then everyone using it or similar
to grab all the messages, I think we need to have a strategy - like who can
host these groups (storage space, bandwidth, prepared to leave server on
24*7), and what we want to do about mirroring the data so the if one
person's server goes AWOL we are not left once more in the lurch.

Dave P.

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 12 April 2016 11:16
To: Peter Gottlieb hpnpilot@... [TekScopes]
Subject: Re[2]: [TekScopes] Yahoo is up for sale, get ready for a
disaster...



I use a piece of excellent software to store certain Yahoo groups. If you or
anyone else fears a group may "disappear" this software will archive the
whole group, with or without images and files, on your own hard drive, ad
infinitum:

A free 30 day trial version is here:

http://www.personalgroupware.com/downloads.htm

A video of how it is used and how it works:

https://www.youtube.com/watch?v=e4PIumS33e0

I have no commercial or social connection, just a very satisfied user.




Best Regards,
Chris Wilson. 2E0ILY


> The group owner can make a list of members, not sure if he is interested
or not.

It is possible to download all the messages, photos and files although
no programs seem to exist for my WinXP machine so I'll leave that to
someone else.
Hopefully they would be in a format which could allow installation to
a different messaging service.
Peter



------------------------------------
Posted by: Chris Wilson <chris@...>
------------------------------------


------------------------------------

Yahoo Groups Links


Re: Tektronix 465 No Trace, No Dot

 

Simpson 260 VOM's provide 20 kOhms/volt sensitivity on all DC volts
ranges, as the basic meter movement is 50 microamps. A Simpson 260 with
a 5 kV range therefore provides circuit loading of 100 megohms. Many
(most?) of the 260's do not have a 5 kV range.

Mike N4MWP

On 04/12/2016 06:10 AM, Malcolm Hunter malcolm.r.hunter@...
[TekScopes] wrote:

On 12 April 2016 at 07:13, w7qed@... [TekScopes] <
TekScopes@...> wrote:

Then I got brave and hooked up my Simpson 260 from chassis to the
"-2450"
test point (TP1423 I believe). On the 5kv range it hardly moved. On
the 500
volt scale it went about half way up. On the DMM this measured
-490V. Now,
it's 11 pm and I know better than to keep at it this evening (as
much as I
want to). Any pointers? I will review the cathode voltage circuits
tomorrow
and take another peek tomorrow evening.
​What's the impedance of the meter? It's most likely that it's
shorting out
the HV​. You need to use a HV probe ideally with gigohm impedance.

Malcolm

[Non-text portions of this message have been removed]



[Non-text portions of this message have been removed]


Re: Yahoo is up for sale, get ready for a disaster...

Peter Gottlieb
 

The ads are why it continues, and is valuable. If it is sold, there might well be more ads, perhaps better targeted, as that's now the "thing."


Peter

On Apr 12, 2016, at 6:35 AM, Tom Gardner tggzzz@... [TekScopes] <TekScopes@...> wrote:

Unfortunately the download page specifies Vista/7/8 - which aren't being sold
anymore. And the creator writes

3. Does this version work with Windows XP?
Not yet. When Yahoo went to Neo we had to get a bit err... creative... to
continue to get messages. We had to use some 3rd party code that is not WinXP
compatible.
Until I can find a WinXP compatible replacement for this code, PGO will not be
WinXP compatible.
Sorry! Wilson.

Presumably not mentioning Win10 is a simple omission, but I have no intention of
buying it.

Archiving is, of course, only sufficient for dead discussions, not continuing
discussions - but that's a separate consideration.

On 12/04/16 11:15, Chris Wilson chris@... [TekScopes] wrote:

I use a piece of excellent software to store certain Yahoo groups. If
you or anyone else fears a group may "disappear" this software will
archive the whole group, with or without images and files, on your own
hard drive, ad infinitum:

http://www.personalgroupware.com/downloads.htm




Re: Yahoo is up for sale, get ready for a disaster...

stefan_trethan
 

Perhaps google groups would work? It has similar email and web based
posting options.

ST

On Tue, Apr 12, 2016 at 10:47 AM, Gordon @GordonW
[TekScopes] <TekScopes@...> wrote:

It doesn't look like there's email capability. Personally I loathe web
only forums and I'm not on my own.

Gordon


Re: Yahoo is up for sale, get ready for a disaster...

Tom Gardner
 

Unfortunately the download page specifies Vista/7/8 - which aren't being sold anymore. And the creator writes

3. Does this version work with Windows XP?
Not yet. When Yahoo went to Neo we had to get a bit err... creative... to
continue to get messages. We had to use some 3rd party code that is not WinXP compatible.
Until I can find a WinXP compatible replacement for this code, PGO will not be WinXP compatible.
Sorry! Wilson.

Presumably not mentioning Win10 is a simple omission, but I have no intention of buying it.

Archiving is, of course, only sufficient for dead discussions, not continuing discussions - but that's a separate consideration.


On 12/04/16 11:15, Chris Wilson chris@... [TekScopes] wrote:

I use a piece of excellent software to store certain Yahoo groups. If
you or anyone else fears a group may "disappear" this software will
archive the whole group, with or without images and files, on your own
hard drive, ad infinitum:

http://www.personalgroupware.com/downloads.htm




Re: Tek 475: square wave leading corners too rounded?

Dave Voorhis
 

Thanks to everyone for their replies — very helpful, and I have learned much.

This morning I more closely compared the calibrator waveforms on the Tek 475 with the Gratten and noticed a difference.

This is the 475, showing the output of the Gratten’s calibrator, though the effect is nominally the same with the output of the 475’s calibrator. The sweep time is 2 microseconds per division and the plateau of the whole square wave is aligned with the first division line. Note that it takes a 8 divisions to reach maximum voltage, i.e., after the initial rapid rise, it takes 16 microseconds to fully reach the plateau of the square wave: https://goo.gl/photos/aT6Jyd6VCLkfmAtS6 <https://goo.gl/photos/aT6Jyd6VCLkfmAtS6>

This is the Gratten, showing the output of its calibrator. The sweep time is 2 microseconds per division and the plateau of the whole square wave has again been aligned with the first division line. Note that the plateau of the square wave is reached within 2 microseconds. https://goo.gl/photos/wkQseUYkiZXPPBeq8 <https://goo.gl/photos/wkQseUYkiZXPPBeq8>

Is this a problem with the 475 (and if so, what is the possible cause?) or does the Gratten lack sufficient vertical resolution to show an actual slow rise in the signal?

Note that I compared the two channels on the 475 by supplying the same calibrator input to both. The displayed waveforms were virtually identical; within hair of each other throughout the traces.

[Non-text portions of this message have been removed]


Re: Yahoo is up for sale, get ready for a disaster...

Chris Wilson
 

I use a piece of excellent software to store certain Yahoo groups. If
you or anyone else fears a group may "disappear" this software will
archive the whole group, with or without images and files, on your own
hard drive, ad infinitum:

A free 30 day trial version is here:

http://www.personalgroupware.com/downloads.htm

A video of how it is used and how it works:

https://www.youtube.com/watch?v=e4PIumS33e0

I have no commercial or social connection, just a very satisfied user.




Best Regards,
Chris Wilson. 2E0ILY

The group owner can make a list of members, not sure if he is interested or not.
It is possible to download all the messages, photos and files although no
programs seem to exist for my WinXP machine so I'll leave that to someone else.
Hopefully they would be in a format which could allow installation to a
different messaging service.
Peter


Re: Tektronix 465 No Trace, No Dot

Malcolm Hunter
 

On 12 April 2016 at 07:13, w7qed@... [TekScopes] <
TekScopes@...> wrote:

Then I got brave and hooked up my Simpson 260 from chassis to the "-2450"
test point (TP1423 I believe). On the 5kv range it hardly moved. On the 500
volt scale it went about half way up. On the DMM this measured -490V. Now,
it's 11 pm and I know better than to keep at it this evening (as much as I
want to). Any pointers? I will review the cathode voltage circuits tomorrow
and take another peek tomorrow evening.

​What's the impedance of the meter? It's most likely that it's shorting out
the HV​. You need to use a HV probe ideally with gigohm impedance.

Malcolm


Re: Tek 492AP: problems with 2072MHz and 829MHz inputs

Tom Gardner
 

Thanks. Strangely the URL works but the auction number does not. Life's too short to try to figure out why.

On 12/04/16 01:45, edbreya@... [TekScopes] wrote:


I think this URL should work. If not, the auction number appears to be 141929945400



Re: Massive document depository

 

In the past few days, I've downloaded both parts of this depository. I used qBittorrent, which I found most pleasant to use.

I'd like to thank those who prepared this depository and made the torrents available.

Raymond


Re: Yahoo is up for sale, download attempts

ykochcal
 

Well I did 101 to 500 and got 341 messages and then did 501 to 1000 and got
481 messages.

I don't see a limit at 1000 yet

John

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Tuesday, April 12, 2016 1:44 AM
To: TekScopes@...
Subject: RE: [TekScopes] Yahoo is up for sale, download attempts

I tried this on a windows 7 laptop, on the LeCroy group (it's has a much
smaller number of messages at about 2000+)

I downloaded messages number 1-100 and got a total of 91.

And am trying to do 101 to 500 now.

The messages are a text file with the message number but I don't see the
links between messages yet. (but have not investigated much yet)

John

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Monday, April 11, 2016 5:59 PM
To: Tom Gardner tggzzz@... [TekScopes]
Subject: Re: [TekScopes] Yahoo is up for sale, get ready for a disaster...

Neo broke the scripts that allowed downloading the archive. Has anyone seen
anything that worked since?

The only think I've found so far is this

http://yahoogroupedia.pbworks.com/w/page/93006447/Chrome%20Application%20To%
20Download%20Messages

This is a chrome extension that will allow you to download messages (not
files).
Yahoo does do rate limiting, so it may have to be done in chunks.

Paul

On Tue, Apr 12, 2016 at 01:07:13AM +0100, Tom Gardner tggzzz@...
[TekScopes] wrote:
On 12/04/16 00:17, Sergey Kubushyn @KSI [TekScopes] wrote:

OK, Yahoo is up for sale. It is very likely it will be sold by pieces to
whoever wants the particular piece. Even if sold as a whole the new
owner
will definitely prune the bad pieces that don't make profit.

It is almost 100% nobody would want Yahoo Groups -- it makes absolutely
no
sense from business standpoint.

We MIGHT still have time to archive the most valuable info to save it
from
being wiped out from the face of Earth but it might also be too late to
preserve the knowledge and information...
It is definitely a worry (especially if the UK's Daily Wail newspaper gets
anywhere near it!), but there are saving graces:
- many other Yahoo groups will have the same problem
- someone somewhere will probably develop a solution
- it won't happen instantly
- who would want to buy Yahoo anyway? The only positive value is in its
share of
Alibaba, and that will probably be sold separately

So, yes, we will want/need to find an alternative hosting mechanism.

Now, I must work out how to use wget to create my own private copy of the
archive; if not, then I'll have to code up a duplicator myself!


Re: Yahoo is up for sale, get ready for a disaster...

Tom Gardner
 

On 12/04/16 09:47, Gordon @GordonW [TekScopes] wrote:
On 12/04/2016 01:58, John Bryan jb001_ym@... [TekScopes] wrote:
Whats wrong with a forum format like this onehttp://bbs.homeshopmachinist.net/forum.php
It doesn't look like there's email capability. Personally I loathe web
only forums and I'm not on my own.
Most, but not all, web forums suck. EEVWeb works reasonably well, for example.

I like the email option; I use it to easily preserve and locate the information that is currently directly useful to me.


Yahoo!

 

From a post on hp_agilent_equipment



OK, Yahoo is up for sale. It is very likely it will be sold by pieces to
whoever wants the particular piece. Even if sold as a whole the new owner
will definitely prune the bad pieces that don't make profit.



It is almost 100% nobody would want Yahoo Groups -- it makes absolutely no
sense from business standpoint.



We MIGHT still have time to archive the most valuable info to save it from
being wiped out from the face of Earth but it might also be too late to
preserve the knowledge and information...



Dave