Date   

Re: Finally acquired a sampling system for my 7004 scope.

Dallas Smith
 

Ops! it's the time position control not trigger.


---In TekScopes@..., <dosmith54@...> wrote :

Hi experts,

Just completed the last accusation with the purchase of a 7S11 and S-4 head to complete a sampling system with my 7T11 purchased last year.

My preliminary check out found that the trigger control on the 7T11 seems defective. It turns about five turns to the end of rotations but with a little more force I can continue to turn it indefinitely both directions. Is this normal? Stop broken? Its part number 311-0965-01.

Everything else seems OK, was able to display a test waveform.
The calibration will be a challenge since I never used a sampling system before.

Dallas


Finally acquired a sampling system for my 7004 scope.

Dallas Smith
 

Hi experts,

Just completed the last accusation with the purchase of a 7S11 and S-4 head to complete a sampling system with my 7T11 purchased last year.

My preliminary check out found that the trigger control on the 7T11 seems defective. It turns about five turns to the end of rotations but with a little more force I can continue to turn it indefinitely both directions. Is this normal? Stop broken? Its part number 311-0965-01.

Everything else seems OK, was able to display a test waveform.
The calibration will be a challenge since I never used a sampling system before.

Dallas


Re: BSM Connector

Nathan Johnson
 

Cool, I'll take a look at that tonight to try to pick out the best style of SMB to fit the case and the backside connection.
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 Thu, Apr 7, 2016 at 21:14, David C. Partridge' @perdrix [TekScopes] <TekScopes@...> wrote:
Not all that hard to do at all. Four long screws to undo and it all comes apart.

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 07 April 2016 18:47
To: David @DWH [TekScopes]
Subject: [TekScopes] Re: BSM Connector

To clarify, you mean to dismantle the sampling head to replace? How bad a job is that?
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 Thu, Apr 7, 2016 at 20:45, David @DWH [TekScopes] <TekScopes@...> wrote:
BSM adapters show up periodically but they are always expensive.

I recommend replacing the BSM connector with an SMB connector and making an SMB to whatever cable.

On Thu, 07 Apr 2016 20:12:53 +0300, you wrote:

I'm just starting to play with sampling gear, and need to access the
pretrigger signal on the S-52, which is the (in)famous BSM connector.
Does anyone have a modern source for an adaptor or cable or anything of
the sort? The only places I have found with the Tek part are the "write
for quote" places that seem really sketchy.

Nathan KK4REY
[Non-text portions of this message have been removed]

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Posted by: Nathan Johnson <jdownj@...>
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[Non-text portions of this message have been removed]


Re: BSM Connector

 

Not all that hard to do at all. Four long screws to undo and it all comes apart.

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 07 April 2016 18:47
To: David @DWH [TekScopes]
Subject: [TekScopes] Re: BSM Connector

To clarify, you mean to dismantle the sampling head to replace? How bad a job is that?
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 Thu, Apr 7, 2016 at 20:45, David @DWH [TekScopes] <TekScopes@...> wrote:
BSM adapters show up periodically but they are always expensive.

I recommend replacing the BSM connector with an SMB connector and making an SMB to whatever cable.

On Thu, 07 Apr 2016 20:12:53 +0300, you wrote:

I'm just starting to play with sampling gear, and need to access the
pretrigger signal on the S-52, which is the (in)famous BSM connector.
Does anyone have a modern source for an adaptor or cable or anything of
the sort? The only places I have found with the Tek part are the "write
for quote" places that seem really sketchy.

Nathan KK4REY



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



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Posted by: Nathan Johnson <jdownj@...>
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Yahoo Groups Links


Re: BSM Connector

Nathan Johnson
 

To clarify, you mean to dismantle the sampling head to replace? How bad a job is that?
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 Thu, Apr 7, 2016 at 20:45, David @DWH [TekScopes] <TekScopes@...> wrote:
BSM adapters show up periodically but they are always expensive.

I recommend replacing the BSM connector with an SMB connector and
making an SMB to whatever cable.

On Thu, 07 Apr 2016 20:12:53 +0300, you wrote:

I'm just starting to play with sampling gear, and need to access the
pretrigger signal on the S-52, which is the (in)famous BSM connector. Does
anyone have a modern source for an adaptor or cable or anything of the
sort? The only places I have found with the Tek part are the "write for
quote" places that seem really sketchy.

Nathan KK4REY



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


Re: BSM Connector

 

BSM adapters show up periodically but they are always expensive.

I recommend replacing the BSM connector with an SMB connector and
making an SMB to whatever cable.

On Thu, 07 Apr 2016 20:12:53 +0300, you wrote:

I'm just starting to play with sampling gear, and need to access the
pretrigger signal on the S-52, which is the (in)famous BSM connector. Does
anyone have a modern source for an adaptor or cable or anything of the
sort? The only places I have found with the Tek part are the "write for
quote" places that seem really sketchy.

Nathan KK4REY


BSM Connector

Nathan Johnson
 

I'm just starting to play with sampling gear, and need to access the
pretrigger signal on the S-52, which is the (in)famous BSM connector. Does
anyone have a modern source for an adaptor or cable or anything of the
sort? The only places I have found with the Tek part are the "write for
quote" places that seem really sketchy.
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]


Wahoo, This saturday is Stuff Day at Sphere Research

 

There is a LOT of stuff this year, literally everything you can imagine, plus radio amateurs from all over BC and Alberta are bringing radio gear to sell and trade. It should be a real blast for those interested in electronics, lots of great stuff both free and cheap, and some very interesting people.

If you need mote details, and directions to our place here in West Kelowna, BC,, CANADA, please look here:

Sphere Research's Stuff Day http://www.sphere.bc.ca/test/stuffday.html
Everything starts at 9am saturday the 9th, hope to see you there. We have lots of Tek and HP goodies this year, too much to list, but all very interesting stuff. for some reason, this year there's lots of counters and function generators too, and let's not forget the Giant Vat of Semiconductors..

all the best,
walter & susan (walter2 -at- sphere.bc.ca)
sphere research corp.
http://www.sphere.bc.ca/test/


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

mosaicmerc
 


Re: Transistor substitute for Q894 on Tek 453

 

On 07 Apr 2016 07:49:23 -0700, you wrote:

Thanks, Tom, David, Dale, and Joe for all of the great advice.

Knowing the difference between matching and selected helps a lot -- I thought I might have had to get a bunch to match them, and that's why I was shy about the pricing.

It would be good to know what tek selected for, in case original parts (e.g., at Sphere) are not available and a substitution is really needed. Can the selection criteria be inferred from the schematic and bandwidth criteria*?
Often it is feasible to reverse engineer a design to determine what
specifications are needed but in this case it would be a lot of work
and it is not needed. The Tektronix common parts design catalog
usually says what a part was selected for as in this case; they
selected them based on collector-emitter breakdown voltage and base
transit time which is a proxy for Ft.


Re: Transistor substitute for Q894 on Tek 453

 

On Thu, 07 Apr 2016 07:48:13 -0400, you wrote:

At 12:44 AM 4/7/2016, mmerig wrote:

This transistor is apparently matched with another ...
They are not matched - they are selected. Matched parts are tested and and chosen so that as a pair they perform as nearly identically as possible. Selected parts are measured and chosen so that specified parameters measure within designated limits - quite a different matter. Selected parts are very common in Tek and HP instruments. If you use a factory original replacement part for Q894 there is no need to replace Q884.

I never try to replace selected semiconductors with anything except the factory original parts - this is an instrument, not consumer electronics. To insure that they are indeed factory original and not fakes I deal only with selected vendors. For Tek 151-0124-00 I would go to Sphere Research, my go-to guys for factory original replacement parts for Tek and HP. They have 49 of them in stock for $6.00 each plus shipping and customs duty from British Columbia. The duty makes them a bit pricey in the US but I use Sphere often for instrument repair parts.

Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcity/radios/index.html
I prefer substitute new parts to NOS parts. Usually they are less
expensive and more reliable but admittedly this requires more reverse
engineering to ensure correct operation and performance.


A6302 Current Probe for sale

 

Hi,


My AM503B has finally crapped out. It has been working if you allow it a few minutes of warm up. I suspect power supply but I have no manual. The A6302 is believed to still be good. The TM503 and other modules in pix are available. I do not offer refund on these as I am shutting down my operation. I will sell the AM503B and A6302 for highest bid over $500. Will consider offers on the others. The pull tab on the SC501 is broke but is fairly easy to pull.


Jerry Massengale


Re: Transistor substitute for Q894 on Tek 453

Mike Merigliano
 

Thanks, Tom, David, Dale, and Joe for all of the great advice.


Knowing the difference between matching and selected helps a lot -- I thought I might have had to get a bunch to match them, and that's why I was shy about the pricing.


It would be good to know what tek selected for, in case original parts (e.g., at Sphere) are not available and a substitution is really needed. Can the selection criteria be inferred from the schematic and bandwidth criteria*?


Also good to know about the tek part suppliers, of course.


By the way, the manuals I have for the tek 453 show either a TA1938 or a 2N3119 for Q894 (tek part number 151-0124-00). The > 20,000 SN version (Dale Cook's scan) lists the 2N3119, the other manual is apparently for an older version, I think I got it from BAMA. I did not see a 2N3501 listed for it in my searching, so the additional choice is good and may benefit someone else too.


*I am not an electrical engineer --mostly self-taught and what I could glean from friends that are EE's.


Re: My 2465 just died

George Onufer
 

Perhaps Mr. Massengale can be persuaded to post a schematic of his test/load unit.  I suspect there is wide interest in that and I would be willing to pay for his investment in time to create that design.
George Onufer


Does anyone have a complete list of 2465B exercizers?

Steve
 

I have a 2465B with the CT and TV sync features.

I have looked at service and owners manuals for both the 2465B and 2467B and cannot find any mention of the following exercisers available on my instrument. I am speaking of the exercisers accessible by pressing (Delta V, Delta T, and slope) simultaneously.

CT Exer 81
BU exer F2
BU exer F1

Reference to any documentation or other explanation would be greatly appreciated.

Thanks..


Re: Transistor substitute for Q894 on Tek 453

Joe
 

If you are worried about buying surplus parts, Newark has brand new 2N3500
for <$2.00 + shipping. As long as the scope performs as intended when
repaired, especially if this is for hobby use, preserving more than 50 year
old instrument with OEM parts may not be that important. Also, there is a
risk with NOS or surplus parts depending on how they've been handled,
although discretes are probably not as sensitive to that.

Joe

On Thu, Apr 7, 2016 at 6:48 AM, 'Dale H. Cook'
bridgewaterma@... [TekScopes] <TekScopes@...>
wrote:



At 12:44 AM 4/7/2016, mmerig wrote:

This transistor is apparently matched with another ...
They are not matched - they are selected. Matched parts are tested and and
chosen so that as a pair they perform as nearly identically as possible.
Selected parts are measured and chosen so that specified parameters measure
within designated limits - quite a different matter. Selected parts are
very common in Tek and HP instruments. If you use a factory original
replacement part for Q894 there is no need to replace Q884.

I never try to replace selected semiconductors with anything except the
factory original parts - this is an instrument, not consumer electronics.
To insure that they are indeed factory original and not fakes I deal only
with selected vendors. For Tek 151-0124-00 I would go to Sphere Research,
my go-to guys for factory original replacement parts for Tek and HP. They
have 49 of them in stock for $6.00 each plus shipping and customs duty from
British Columbia. The duty makes them a bit pricey in the US but I use
Sphere often for instrument repair parts.

Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcity/radios/index.html



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


Re: Transistor substitute for Q894 on Tek 453

Dale H. Cook
 

At 12:44 AM 4/7/2016, mmerig wrote:

This transistor is apparently matched with another ...
They are not matched - they are selected. Matched parts are tested and and chosen so that as a pair they perform as nearly identically as possible. Selected parts are measured and chosen so that specified parameters measure within designated limits - quite a different matter. Selected parts are very common in Tek and HP instruments. If you use a factory original replacement part for Q894 there is no need to replace Q884.

I never try to replace selected semiconductors with anything except the factory original parts - this is an instrument, not consumer electronics. To insure that they are indeed factory original and not fakes I deal only with selected vendors. For Tek 151-0124-00 I would go to Sphere Research, my go-to guys for factory original replacement parts for Tek and HP. They have 49 of them in stock for $6.00 each plus shipping and customs duty from British Columbia. The duty makes them a bit pricey in the US but I use Sphere often for instrument repair parts.

Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcity/radios/index.html


177 Fixture knob

Mark Wendt
 

Hi Folks,

Finally got me a 177 test fixture for my 577 CT. Everything looks good on the first run through, but it is missing the Base/Emitter Ground knob, Tek part number 366-1126-00. None of the usual suspects list this knob in stock. Anybody got a spare one?

Thanks,
Mark


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

Tom Gardner
 

I've been wanting to get "into RF" for a while, and have wanted a spectrum analyser. I picked up a Tek 492AP cheaply because, while basically functional after recapping, the owner was clear that he didn't have the means to test it properly. Now I have time to look at it, and before I poke around too much, I'd like opinions on what might be causing "spurs" and "breakthrough" (note the quotes, indicating that they are probably incorrect terminology).

Hopefully people can direct me towards which subsystems are likely to be faulty. I'm guessing RF parts (especially the "unprotected" first mixer) are the culprit, but hoping it is something simpler or cheaper.

Available RF equipment:
- Tek 492AP, s/n 8010373, firmware 4.6/1.1, no option 001 preselecter/limiter.
- Cheapo AMD4351 signal generator, 34-4400MHz, but frequencies below 2200MHz are especially rich in harmonics since they are derived by dividing down digitally
- uncalibrated SDR, up to 1500MHz

The sig gen is coupled to the SA using an external 20dB pad and DC block, and the SA is set with 20dB internal attenuation; I believe that precludes overloading the input.

The artek manual states there are two different LOs depending on the band in use: 2072MHz and 829MHz, and a common IF of 110MHz.

So what do I notice? (I'll try to keep this readable, but the "text only" forum format may get in the way.) All measurements are made with the SA itself.

The "breakthrough" symptom
==========================

Low band, 2072MHz LO, sig gen -20dBm
- 2075MHz, display as as expected
- 2072MHz, -16dBm pure white noise, i.e. a horizontal straight line
- 834MHz, display as expected
- 829MHz, display as expected

Band 1, 1700-5500MHz, 829MHz LO, sig gen -20dBm
- 2075MHz, display as as expected
- 2072MHz, display as as expected
- 834MHz, display as expected
- 829MHz, -16dBm pure white noise, i.e. a horizontal straight line


The "spurs" symptoms
====================

Low Band (0-4200MHz)
========

Sig gen input 2200MHz -20dBm, spurs:
- 2456MHz,-43dBm
- 64MHz,-36dBm
- 192MHz,-56dBm
- 818MHz,-57dBm

Sig gen input 2210MHz (i.e. +10MHz), powers are unchanged
- 2486MHz (i.e. +30MHz)
- 69MHz (i.e. +5MHz)
- 206.8MHz (i.e. +15MHz)
- 828.6MHz (i.e. +10MHz)

What can be inferred from those spurious frequencies
and frequency changes?



Band 2 (1700-5500MHz)
======
Artek manual: 1st IF 829MHz, 2nd LO 719MHz

Sig gen input 2200MHz, -16.6dBm (not -20dBm)
- 4942MHz,-41dBm
- 2885MHz,-54dBm
- 2056MHz,-56dbm

Sig gen input 2200MHz, (i.e. +10MHz), powers are unchanged
- 4972 (i.e. +30MHz)
- 2900 (i.e. +15MHz)
- 2071 (i.e. +15MHz)


Band 3 (3000-7100MHz)
======
Artek manual: 1st IF 829MHz, 2nd LO 719MHz

Sig gen 2200MHz (i.e nominally out of band)
-3858MHz,-15dbm

Sig gen 2200MHz (i.e nominally out of band)
-3868MHz (i.e. +10MHz)

Now, what's causing/generating those frequencies?


Re: Interesting...

stefan_trethan
 

Looks tired for NOS ;-)

ST

On Thu, Apr 7, 2016 at 12:03 PM, Malcolm Hunter
malcolm.r.hunter@... [TekScopes] <TekScopes@...>
wrote:

Did the dog swallow it?

ebay #281995004780






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Posted by: Malcolm Hunter <malcolm.r.hunter@...>
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