Date   
Re: 5xx 'Scopes

@0culus
 

On Sun, Aug 11, 2019 at 01:45 PM, Dave Daniel wrote:


Sean,

I was hoping you lived nearer to one the places where I have lived
(Denver/Boulder area in CO and east coast central FL) so I could perhaps make
some suggestions about where to look. I only know of Sandia in the Albuquerque
area.

DaveD

Dave,

Road trips to Denver area are not out of the question! Suggestions always welcome. There's also Los Alamos...there used to be a great surplus store there that had tons of quality old test equipment...sadly it is gone now last I heard.

Sean

Sean

Re: oh yeah?

Jim Ford
 

Ha, I figured somebody in the group would show up Snapdiode sooner or later!Dennis, it looks like the S-42 has a bit of reflections inside it.  The OIG-502 uses an ingenious scheme to avoid generating them at the source; the laser diode is biased such that any current reflections on its input due to imperfections in the termination are below the LD threshold current.  LD physics is such that the current reflections have no effeffect on the optical output.  Voila, reflection-free optical impulses!  I assume a brilliant engineer at Tek came up with that; correct me if I'm wrong.  I had one back in the mid 1990's at Lockheed Aircraft Service Co., housed in a TM502 mainframe (the TM501 was unavailable at the time, IIRC).Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Dennis Tillman W7PF <@Dennis_Tillman_W7PF> Date: 8/11/19 12:44 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] oh yeah? Hi Snapdiode,For the past month and a half I haven't had a moment to myself. The constant pressure has been no fun at all.  That all changed today when I saw your post. Thank you.I put a few pictures of the sampling heads and other related stuff I have up on TekScopes in the photo section. There is also a nice screen shot of the response of an S-42 (like yours) if you connect it to an OIG-502 Optical Impulse Generator.The pictures are at: https://groups.io/g/TekScopes/album?id=94144Dennis Tillman W7PF-----Original Message-----Sent: Saturday, August 10, 2019 9:11 PMSubject: Re: [TekScopes] oh yeah?Pretty sure I'm the only one with four 1S2s, a 1L30, and a Type O on my street!Maybe I'm just the prince of sampling heads. Come on, a S-42? How cool is that? :) It fits between my S-1, S-2, S-3, S-4, S-5, S-6 and just before my S-52.-- Dennis Tillman W7PFTekScopes Moderator

Re: Saving A5 Timing Board NVRAM calibration constants CSA803 (A/C) and 11801(B/C)

 

On Sun, Aug 11, 2019 at 11:49 AM, gjm45janssen wrote:


The procedure is as follows. Remove the NVRAMs from the Timing Board,
If you have to desolder the NVRAM, make sure that the board carrying it isn't grounded while desoldering, as would be the case if the 'scope is switched off but still plugged in: The earthing of your soldering iron might provide a logic low level to a write (enable) pin, possibly destroying the contents of the chip. In general, beware of transients. Depending on the chip (I haven't looked up the specs), it might be wise to temporarily connect the Vcc pin to the potential that the tip of your soldering iron is at (usually safety earth) so only a logic high level could reach the chip via your soldering iron. Most chips need a logic low level to enable writing.

Raymond

Re: 465 knob 366-1280-00 (trigger level) wanted

 

On Sun, Aug 11, 2019 at 09:54 PM, george edmonds wrote:


I should have one if it is the inner knob you want,
AFAIK, it's the outer (ribbed) knob, according to available documentation...

Raymond

Re: Tektronix 577 Regular board capacitor question

Stephen Hanselman
 

We have several sizes of boards that take snap-in caps and replace the old “twist tab” and screw-in caps

Regards,

Stephen Hanselman
Datagate Systems, LLC
3107 North Deer Run Road #24
Carson City, Nevada, 89701
(775) 882-5117 office
(775) 720-6020 mobile
s.hanselman@...
www.datagatesystems.com
a Service Disabled, Veteran Owned Small Business
DISCLAIMER:
This e-mail and any attachments are intended only for use by the addressee(s) named herein and may contain legally privileged and/or proprietary information. If you are not the intended recipient, any dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please immediately notify me and permanently delete the original and all copies and printouts of this e-mail and any attachments.

On Aug 11, 2019, at 08:38, DW <wilson2115@...> wrote:

When in doubt just ask the seller selling the adapter board, they will see if they can make a version of this board that accepts snap on capacitors


Re: 465 knob 366-1280-00 (trigger level) wanted

george edmonds
 

Hi

I certainly have the outer knob which is the trigger polarity selector.

George G6HIG

On Sunday, August 11, 2019, 10:40:00 PM GMT+1, Raymond Domp Frank <@Raymond> wrote:

On Sun, Aug 11, 2019 at 09:54 PM, george edmonds wrote:


I should have one if it is the inner knob you want,
AFAIK, it's the outer (ribbed) knob, according to available documentation...

Raymond

Re: 5xx 'Scopes

Dave Brown
 

Definitely IS gone- went there specially to visit it back in 2015 (or was it 2014?) and found it basically all shut up and not much to see thru the windows or in the yard.
Here's a news item about it-
https://www.santafenewmexican.com/news/local_news/los-alamos-black-hole-is-going-dark/article_a83de44e-0f9d-530c-bd40-1b3b4f6556f5.html

DaveB, NZ

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of sdturne@q.com
Sent: Monday, August 12, 2019 08:57
To: TekScopes@groups.io
Subject: Re: [TekScopes] 5xx 'Scopes

On Sun, Aug 11, 2019 at 01:45 PM, Dave Daniel wrote:


Sean,

I was hoping you lived nearer to one the places where I have lived
(Denver/Boulder area in CO and east coast central FL) so I could
perhaps make some suggestions about where to look. I only know of
Sandia in the Albuquerque area.

DaveD

Dave,

Road trips to Denver area are not out of the question! Suggestions always welcome. There's also Los Alamos...there used to be a great surplus store there that had tons of quality old test equipment...sadly it is gone now last I heard.

Sean

Sean

Re: 5xx 'Scopes

@0culus
 

On Sun, Aug 11, 2019 at 04:12 PM, Dave Brown wrote:


Definitely IS gone- went there specially to visit it back in 2015 (or was it
2014?) and found it basically all shut up and not much to see thru the windows
or in the yard.
Here's a news item about it-
https://www.santafenewmexican.com/news/local_news/los-alamos-black-hole-is-going-dark/article_a83de44e-0f9d-530c-bd40-1b3b4f6556f5.html

DaveB, NZ
Such a shame...thanks for the note and the confirmation.

Sean

Re: General Radio 874 Connector, inner conductor "bendies"

Dale H. Cook
 

On 8/11/2019 4:08 PM, Bruce Hunter wrote:

The 774-series connectors were the predecessors of the 874-type and best described as a banana plug encased with an outer shield.  They were not hermaphroditic.
The Type 774 connectors were used on many GR instruments from its introduction in 1941 until it was supplanted by the Type 874. The 774 was a constant impedance connector which was used for the generator and detector connections of two of the first instruments using it - the Type 821-A Twin-T Impedance Measuring Circuit and the Type 916-A Radio-Frequency Bridge. About 1951 the lower frequency Type 916-AL was introduced with 874 connectors and at that time the 916-A was changed to 874 connectors. Introduced at that time were two other instruments that would not have worked well (if at all) with the 774 connectors - the Type 1601-A V-H-F Bridge (yes, it was hyphenated in the catalog and manual) and the Type 1602-A U-H-F Admittance Meter (ditto).
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/

Re: oh yeah?

 

Hi Jim,

I uploaded another screen shot into the album I created last night.
The album is at https://groups.io/g/TekScopes/album?id=94144
The photo is called 7) S-42 Internal Reflections.
It shows what happens to the S-42 internal reflections until they die out about 1.5nSec after the optical pulse ends.

If you were doing optical work with fibers in the early 1990s you may have been using Diamond 3.5mm optical connectors like the ones in the 7F10 Optical to Electrical Converter plug-in I have. I would like to be able to use it but I have not been able to find that connector anywhere nor have I found an adapter that would allow me to use a more common fiber optic connector so I could plug the newer connector in one end of the optical adapter cable and plug the other end of the optical adapter cable into the 7F10. That would allow me to use the 7F10 without trying to change the Diamond 3.5mm connector.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jim Ford
Sent: Sunday, August 11, 2019 2:01 PM

<snip>
Dennis, it looks like the S-42 has a bit of reflections inside it. The OIG-502 uses an ingenious scheme to avoid generating them at the source; the laser diode is biased such that any current reflections on its input due to imperfections in the termination are below the LD threshold current. LD physics is such that the current reflections have no effeffect on the optical output. Voila, reflection-free optical impulses! I assume a brilliant engineer at Tek came up with that; correct me if I'm wrong. I had one back in the mid 1990's at Lockheed Aircraft Service Co., housed in a TM502 mainframe (the TM501 was unavailable at the time, IIRC).Jim Ford Sent




--
Dennis Tillman W7PF
TekScopes Moderator

Re: oh yeah?

Jim Ford
 

Thanks, Dennis.  That looks about right.  1.5 ns corresponding to about 1 foot of fiber prop delay.IIRC, we used ST and FC/PC fiber connectors back then.  I think my OIG502 had an FC on it.  I'm not familiar with the diamond connectors.Nice collection of 7S12, 7S11s, 7T11s, and 7T11As you have!  I struggle with my 7S12, 7S11, two S4s, and S-53s to get a stable trace.  Right now I put them in my 7904, but eventually I want to use my 7603 for the larger screen.  Got to fix the warped middle plug-in connector on the 7603 first, though.JimSent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Dennis Tillman W7PF <@Dennis_Tillman_W7PF> Date: 8/11/19 5:32 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] oh yeah? Hi Jim,I uploaded another screen shot into the album I created last night. The album is at https://groups.io/g/TekScopes/album?id=94144The photo is called  7) S-42 Internal Reflections. It shows what happens to the S-42 internal reflections until they die out about 1.5nSec after the optical pulse ends.If you were doing optical work with fibers in the early 1990s you may have been using Diamond 3.5mm optical connectors like the ones in the 7F10 Optical to Electrical Converter plug-in I have. I would like to be able to use it but I have not been able to find that connector anywhere nor have I found an adapter that would allow me to use a more common fiber optic connector so I could plug the newer connector in one end of the optical adapter cable and plug the other end of the optical adapter cable into the 7F10. That would allow me to use the 7F10 without trying to change the Diamond 3.5mm connector.Dennis Tillman W7PF-----Original Message-----From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jim FordSent: Sunday, August 11, 2019 2:01 PM<snip> Dennis, it looks like the S-42 has a bit of reflections inside it.  The OIG-502 uses an ingenious scheme to avoid generating them at the source; the laser diode is biased such that any current reflections on its input due to imperfections in the termination are below the LD threshold current.  LD physics is such that the current reflections have no effeffect on the optical output.  Voila, reflection-free optical impulses!  I assume a brilliant engineer at Tek came up with that; correct me if I'm wrong.  I had one back in the mid 1990's at Lockheed Aircraft Service Co., housed in a TM502 mainframe (the TM501 was unavailable at the time, IIRC).Jim Ford Sent -- Dennis Tillman W7PFTekScopes Moderator

Re: 5xx 'Scopes

Phillip Potter
 

Hi Dave,

Yes, I am sad to report that the "Black Hole" closed many?? years ago.?? I had heard of it and when I was traveling through stopped in.?? It was a mammoth place with EVERYTHING you could imagine... well, I could imagine, anyway. I bought a few things, but swore to return.

The next time I was there a half a year later, it was closed! I wonder if all that stuff is still there behind closed doors... I can dream, can't I?

Phil-in-CA

On 8/11/2019 2:56 PM, sdturne@q.com wrote:
There's also Los Alamos...there used to be a great surplus store there that had tons of quality old test equipment...sadly it is gone now last I heard.

Re: oh yeah?

Dave Casey
 

I'm in the same boat regarding the general unavailability of Diamond 3.5
patch cables. I'm sure they're out there, but nobody knows what they are.
So unless you find some in a bin at a surplus store, they're going to be
hard to come by. It's worth noting that HP used Diamond 2.5 in a few pieces
of gear, but by then it was called "HMS-10" (for single mode, multi mode is
HFS-13). The thread pitch and other dimensions are identical to Diamond
3.5, it's just the ferrule that's different. I've wondered if an HMS-10
cable could be used if one could shim the difference. The Diamond 3.5 is
HMS-0 in single-mode and HFS-3 in multi-mode. Vendors were offering patch
cables with the connectors on them as recently as 2000 per one datasheet
I've found. There's just not enough value in the resale market for them to
come out of the woodwork.

Dave Casey

On Sun, Aug 11, 2019 at 7:32 PM Dennis Tillman W7PF <@Dennis_Tillman_W7PF>
wrote:

Hi Jim,

I uploaded another screen shot into the album I created last night.
The album is at https://groups.io/g/TekScopes/album?id=94144
The photo is called 7) S-42 Internal Reflections.
It shows what happens to the S-42 internal reflections until they die out
about 1.5nSec after the optical pulse ends.

If you were doing optical work with fibers in the early 1990s you may have
been using Diamond 3.5mm optical connectors like the ones in the 7F10
Optical to Electrical Converter plug-in I have. I would like to be able to
use it but I have not been able to find that connector anywhere nor have I
found an adapter that would allow me to use a more common fiber optic
connector so I could plug the newer connector in one end of the optical
adapter cable and plug the other end of the optical adapter cable into the
7F10. That would allow me to use the 7F10 without trying to change the
Diamond 3.5mm connector.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jim
Ford
Sent: Sunday, August 11, 2019 2:01 PM

<snip>
Dennis, it looks like the S-42 has a bit of reflections inside it. The
OIG-502 uses an ingenious scheme to avoid generating them at the source;
the laser diode is biased such that any current reflections on its input
due to imperfections in the termination are below the LD threshold
current. LD physics is such that the current reflections have no effeffect
on the optical output. Voila, reflection-free optical impulses! I assume
a brilliant engineer at Tek came up with that; correct me if I'm wrong. I
had one back in the mid 1990's at Lockheed Aircraft Service Co., housed in
a TM502 mainframe (the TM501 was unavailable at the time, IIRC).Jim Ford
Sent




--
Dennis Tillman W7PF
TekScopes Moderator



Re: 5xx 'Scopes

@0culus
 

It's always sad when a great one off place like that goes away. Oh well. I'm not in any huge hurry to obtain a 500 scope...I'm going to be patient and keep my eyes open. In the meantime, a curve tracer is the next piece of gear that would be very useful for helping repairing other stuff. :o)

Sean

Re: Tektronix 577 Regular board capacitor question

DW
 

Thanks, here is some more details

Tektronix 577 power supply C744 1700uF 250V, the capacitor has a 4 point triangle mount on the board

Re: Want to buy: SG-503

satbeginner
 

Hi all,

I just found one and it is coming to me.
Also found the corresponding cable that belongs to it.

Thanks,

Un saludo,

Leo (Satbeginner)

Re: 465 knob 366-1280-00 (trigger level) wanted

Colin Herbert
 

I think you might have a different idea on "inner" and "outer" to the rest of us with regard to concentric knobs. I believe that the knob Nigel is looking for is that with continuous rotation (i.e. a pot knob), labelled "Trigger Level", grey plastic and the greater diameter. The "Trigger Polarity" knob is a two-position switch knob, sits within the "Trigger Level" knob and has a smaller diameter. It is a light coloured plastic and has flattened sides.

These trigger knob pairs are common to many 400-series portable scopes and maybe other equipment, too.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of george edmonds via Groups.Io
Sent: 11 August 2019 22:54
To: TekScopes@groups.io
Subject: Re: [TekScopes] 465 knob 366-1280-00 (trigger level) wanted

Hi

I certainly have the outer knob which is the trigger polarity selector.

George G6HIG
On Sunday, August 11, 2019, 10:40:00 PM GMT+1, Raymond Domp Frank <@Raymond> wrote:

On Sun, Aug 11, 2019 at 09:54 PM, george edmonds wrote:


I should have one if it is the inner knob you want,
AFAIK, it's the outer (ribbed) knob, according to available documentation...

Raymond

Re: 465 knob 366-1280-00 (trigger level) wanted

 

On Mon, Aug 12, 2019 at 12:24 PM, Colin Herbert wrote:


I think you might have a different idea on "inner" and "outer" to the rest of
us with regard to concentric knobs.
As Colin says: Depends on what you consider "outer": longitudinally or radially with regard to the shaft...
As I mentioned earlier, the part no. refers to the ribbed knob for trigger level, not the rising/falling selector, so "radially outer" is the one needed.

Raymond

Re: 465 knob 366-1280-00 (trigger level) wanted

NigelP
 

Depends on your concept of inner and outer (concentrically, or front-to-rear)!

What I need is the larger diameter ribbed grey knob, no-skirt, and with a white stripe for trigger level adjustment, not the switchy thing in the centre for polarity. Mine has got the internal metal clamping ring and screw nicely attached to the shaft but no meat around it.

Looks exactly the same as the 465B version (I've got one of each). It's probably used on many other scopes and or plug-ins. I thought I had a list of what bits go on which scopes but all I can find is a spreadsheet that I can't remember how to use!!!

Regards

Nigel G8AYM

Re: 465 knob 366-1280-00 (trigger level) wanted

george edmonds
 

Hi Nigel

I have both knobs. They are also used on the 475 and 475A.

Please contact me off list at G6HIG at Yahoo dot com if you want the knob.

73 George G6HIG

On Monday, August 12, 2019, 12:06:01 PM GMT+1, NigelP <nigel-pritchard@...> wrote:

Depends on your concept of inner and outer (concentrically, or front-to-rear)!

What I need is the larger diameter ribbed grey knob, no-skirt, and with a white stripe for trigger level adjustment, not the switchy thing in the centre for polarity. Mine has got the internal metal clamping ring and screw nicely attached to the shaft but no meat around it.

Looks exactly the same as the 465B version (I've got one of each). It's probably used on many other scopes and or plug-ins. I thought I had a list of what bits go on which scopes but all I can find is a spreadsheet that I can't remember how to use!!!

Regards

Nigel G8AYM