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Re: 647 cal fixture on ebay

 

Snort!

Seriously, it's not ham shorthand at all, it's chatroom
shorthand, stands for If I Recall Correctly.
Other related ones:
AFAIK As Far As I Know
YMMV Your Mileage May Vary

These serve to delineate precisely how much you do *not* know
about what you're talking about :)

Regards,
Dave Wise

-----Original Message-----
From: Stan & Patricia Griffiths [mailto:w7ni@...]
Sent: Wednesday, March 03, 2004 2:54 PM
To: Miroslav Pokorni
Cc: TekScopes
Subject: Re: [TekScopes] 647 cal fixture on ebay


I've been a "ham" for 51 years and "IIRC" is a new one one me!

My guess: "IIRC" = "In the Instance that you Really Care . . ."

Stan
w7ni@...

----- Original Message -----
From: "Miroslav Pokorni" <mpokorni2000@...>
To: <tekscopes@...>; "Tim Phillips" <t.phillips@...>
Sent: Tuesday, March 02, 2004 12:41 PM
Subject: Re: [TekScopes] 647 cal fixture on ebay


What does 'IIRC' mean? I presume, that is one of those cute
ham operators
abbreviations, that even few of them know what they mean.
Not all of us on
Tekscope are ham operators.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Tim Phillips" <t.phillips@...>
To: <tekscopes@...>
Sent: Tuesday, March 02, 2004 5:00 AM
Subject: [TekScopes] 647 cal fixture on ebay


Hi, all;
IIRC someone on this group has a 647.
FYI there is a cal fixture plug-in 016-0224-01
on ebay #3801315295.
(usual disclaimer etc.)
kindest regards
Tim





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Re: ligthing gel

 

Thank you, Craig. That was very smart of me: said 'lighting gel' and then
went on about photographic filters.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...>
To: "TekScopes" <TekScopes@...>
Sent: Friday, March 05, 2004 1:09 AM
Subject: [TekScopes] ligthing gel


You did mention that lighting gel before, but I still do not
understand what
is that material and why musical instrument repair shops would have it.

I presume, the material is a gel with dye, deposited on transparent
film,
something to be used to make custom photographic filters. The film must
be
very thin, to avoid optical distortions due wavy surface caused
by mounting.
In that case, how you would make a 4 x 6" screen without film
collapsing?
Please, explain the construction.
Lighting gel is the stuff that is used in front of stage lighting in
threatres and film sets. It is available in very many colours, in large
sheets, and is heat resisting. It is thinner than the plastic sheet used
in
front of Tek scopes for sure - but it would certainly be better than
nothing.

Something like this looks
about right for the standard blue 7000 series 'scope filter.

Craig
Re: Bias batteries in 7S14

Michael Dunn
 

At 12:22 AM +1100 2004/3/6, jeans wrote:
You can download the instruction Manual from TekNet at
<>. You need to sign up but they seem to be

Thanks! I've added their URL to our Links page. I'd advise any members who haven't checked out that page to do so sometime. Lots of good stuff...

Michael
Re: 7S/7T Sampling System

Ashton Brown
 

Craig, thanks!

+11 Informative..

Your post encapsulates about a dozen questions I've had re refurb of the pure unobtainium stuff.
Printed!
It's Very nice to know that, with some precise fiddling - many of these can be resurrected.
(And thanks to Stan, repeatedly - for supplying the unobtainium Information!)
GaAs back with a vengeance, eh? 150 Ghz might get us 5000 Channels - with nothing watchable..

Two ears and a tail - {static-free, of course}


Ashton

Craig Sawyers wrote:

I have read postings about using some fast Schotky
diodes in place of some of Tek's GaAs diodes but I have no personal
experience with this . . .
I did this with a defunct S3a 1GHz sampling probe. The brige was toast
(well, some of the diodes were leaky in reverse bias). Stan helped out by
looking up the spec of the original bridge diodes for me.

I found that the basic spec, most critically reverse leakage and capacitance
were matched rather well with Agilent microwave Schottkys, HSMS8202. These
are diode pairs in a single SOT23 surface mount package. By flipping one of
them over, and soldering the pair of pins one edge together you end up with
a bridge. Costs about 3 bucks.

Replacing the defunct bridge with this one worked perfectly - specification
of the resulting probe is exactly as it ought, full 1GHz bandwidth and
aberrations well within spec. I suspect that this approach would work well
with all the earlier samplers up to around 4GHz, including the S1 and S2.

The most obvious difference between GaAs, silicon junction and Schottky is
the foward voltage drop. GaAs is well over a volt, Si is about 0.7V, and
Schottky is about 0.3V. As I said I had no trouble, but potential problems
might arise with the reverse bias voltage and the magnitude of the strobe
signal. Usually these have a preset pot associated with them, and so can be
adjusted somewhat.

With the 1S1, the early GaAs bridge diodes were replaced later with Si ones
so it is certainly possible to do this on the 1S1.

The reason for GaAs was it was the only way to get speed in the early days
of samplers. Then silicon processing caught up, and GaAs production went
into a bit of a decline until LEDs came along, which are based on metallic
alloys of III/V semiconductors like GaAs. And now, GaAs is used in the very
fastest transistor technologies, the so called HEMT (high electron mobility
transistor) - these beasts still have useful gain at 150GHz plus.

Later (and much faster) sampling heads like the S4 and S6 used Schottky
diodes from day one. In fact to get the speed these are impressively tiny
to get the capacitance and lead inductance down - the junction is only 3um x
3um, and ridiculously easy to vapourise with static discharge, and event
that would ruin your day. The thick film, charge trap heads simply don't
lend themselves to being fixed on these fast samplers; if you zap them they
are scrap.

Other things that sampler fixers might like to bear in mind is that "back
diodes" (tunnel diodes with a very low peak current of about 100uA)are what
the microwave fraternity now confusingly calls tunnel diodes. They are
essentially used as zero bias detectors, and I think that close equivalents
to the BD4 could be found. Likewise the snap-off diodes that are used in
the strobe circuits are still available from the microwave component
suppliers, now called step-recovery diodes. Anyone wanting a browse through
this sort of arcana could look at

The only tricky thing is true tunnel diodes, for which there is no chance of
a commercially available equivalent.

Craig




Yahoo! Groups Links
Re: 475A filter, protective cap availability?

Robert Morein
 

Lighting gels are not very thin, because they are mounted in front of
lights, not lenses.
The dye is "cast" into the material.

----- Original Message -----
From: "Miroslav Pokorni" <mpokorni2000@...>
To: <TekScopes@...>; "Mark Anton" <heightstv@...>
Sent: Friday, March 05, 2004 3:07 AM
Subject: Re: [TekScopes] 475A filter, protective cap availability?


Hello Mark,

You did mention that lighting gel before, but I still do not understand
what
is that material and why musical instrument repair shops would have it.

I presume, the material is a gel with dye, deposited on transparent film,
something to be used to make custom photographic filters. The film must be
very thin, to avoid optical distortions due wavy surface caused by
mounting.
In that case, how you would make a 4 x 6" screen without film collapsing?
Please, explain the construction.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Mark Anton" <heightstv@...>
To: <TekScopes@...>
Sent: Thursday, March 04, 2004 5:29 PM
Subject: RE: [TekScopes] 475A filter, protective cap availability?



I think i might have mentioned before on this list, an item that works
well
for a screen filter is lighting gel material. You can pick the
color....use
one that is close to the color of the trace. A musical intrument
repair
shop should possibly have some. The only to be careful of is not too
get
one that is too opaque. Then you would have to turn up intensity
farther
than needed to view the trace. I have used gel material on several
scopes
now and works well. It isnt just for looks either...the reason it is
there
is to provide a higher contrast trace. vs seeing a white background.

Maybe someone else might know of where you could get a cover.

Mark Anton, Owner
Heights TV & VCR Service
3946 Central Ave. NE
Columbia Heights MN, 55421

Phone is 763-789-1767

(area code formerly 612)





----Original Message Follows----
From: timothy.urban@...
To: <TekScopes@...>
Subject: [TekScopes] 475A filter, protective cap availability?
Date: Wed, 3 Mar 2004 08:21:34 -0500

Got a nice working 475A, would like to replace the original blue/green
CRT
filter with a nice sharp new one. Ar they commonly available?

Also need the protective cap that fits over the face of the scope - what
do these go for, and are there any better sources for them?

Thanks

Tim
N5IIT

_________________________________________________________________
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Yahoo! Groups Links
Re: Bias batteries in 7S14

jeans
 

You can download the instruction Manual from TekNet at
<>. You need to sign up but they seem to be
OK. Click on the manual panel on the left of their web site and follow the
instructions. You can only download 5 manuals per month. The file is large,
25 Mbytes so s fairly complete.
Don Black.

Michael Dunn wrote:

Does anyone have a digitized manual...?

At 12:45 PM -0600 2004/3/4, Scott Newell wrote:
At 12:39 PM 3/4/2004 , vollumscope wrote:
With all the talk of TEK samplers and the mention of the 7S14, I
wonder what are we 7S14 owners to do these days when it comes to
replacing the bias batteries in the 7S14?
Funny, I was going to ask if there were any symptoms of weak cells.
Anything to watch out for?


Yahoo! Groups Links
Re: Your document (Public Humiliation)

Ashton Brown
 

Yes, I'd expect that by now - most Tekscopes readers are aware of the harvesting of e-mail addresses: often via the wide-OPEN access to LookOut and M$ Office -- holes even larger than those in the OS itself. The first target often is: one's address book. This has been going on only since.. version 3.x of this humongous 'application on-top-of DOS' - ergo

Pretty likely, someone with Mr. G's address in *their* book is most apt to be the real source of the nastily tainted message.
(Note too that, Yahoo strips off attachments by default)

But then, with Dumont grade s/ware in millions of places: who can resist poking it with a blunt object?



daveolla wrote:

Greetings, Grobbins says not guilty! people always make the front page when accused, and their later innocence buried in the folds of the last pages.
--- In TekScopes@..., "Howard Matthews" > Grobbins got a virus!

Neener, neener, neener!
-----------------< snip >------------------
Re: Your document (Public Humiliation)

 

Greetings, Grobbins says not guilty! people always make the front
page when accused, and their later innocence buried in the folds of
the last pages.
--- In TekScopes@..., "Howard Matthews" > Grobbins got a
virus!
Neener, neener, neener!

To answer your allegations Mr. Neener
-Norton antivirus is updated automatically, often.
-Presently no viruses have been found.
-No attachements have been opened since Feb 5 ( from one of our
members), and it was run thru Norton, it was clean.
-I also did not post anything on the site since Feb 4, message 6693.
I have noticed that my full email address showed up on the post
supposedly sent by me, however, none of my "real posts" have this.

Mr. Neener wrote;
1. Did not have antivirus software up-to-date, AND
2. Opened an unsafe attachment from a source he did not really
recognize.
For a techie to fall for one of
these is embarrassing.
P.S. Grobbins probably doesn't even know he has started this
thread. But if he has an excuse other than "sorry", we could
probably all learn from it. (Hint, hint :)
OK, I'm sorry...... that as a techie you fell for this, but you need
not be embarrassed because this group is meant to help even those
that have little understanding, and since when did this "Classic Tube
Scopes" group require the computer savey of 11 year olds!! We all
must try to ensure our measurements are made properly for any kind of
precision.

The Real grobbins@n...
Daveolla
P.S. The real Daveolla certainly would have started his post with a
friendly "Greetings", that should have been another clue!
P.S.S. hold the presses, front page, above the crease, this just
in..............

--- In TekScopes@..., grobbins@n... wrote:
Please have a look at the attached file.
ligthing gel

Craig Sawyers
 

You did mention that lighting gel before, but I still do not
understand what
is that material and why musical instrument repair shops would have it.

I presume, the material is a gel with dye, deposited on transparent film,
something to be used to make custom photographic filters. The film must be
very thin, to avoid optical distortions due wavy surface caused
by mounting.
In that case, how you would make a 4 x 6" screen without film collapsing?
Please, explain the construction.
Lighting gel is the stuff that is used in front of stage lighting in
threatres and film sets. It is available in very many colours, in large
sheets, and is heat resisting. It is thinner than the plastic sheet used in
front of Tek scopes for sure - but it would certainly be better than
nothing.

Something like this looks
about right for the standard blue 7000 series 'scope filter.

Craig
Re: Tek C-53 Camera And C50/C70 Film Back

 

Hello Greyhawk,
What do you need from that manual? It is pretty big and I have a paper copy
that would need to scanned, so do not push it.

Regards

Miroslav Pokorni

----- Original Message -----
From: "greyhawkeng" <greyhawkeng@...>
To: <TekScopes@...>
Sent: Wednesday, March 03, 2004 1:58 PM
Subject: [TekScopes] Tek C-53 Camera And C50/C70 Film Back


Can Someone Send Me A .PDF File Of The Operator/Service Manual?
Have One That Has Been Hacked Up, And Want To Restore. TIA

Greyhawk
Re: 475A filter, protective cap availability?

 

Hello Mark,

You did mention that lighting gel before, but I still do not understand what
is that material and why musical instrument repair shops would have it.

I presume, the material is a gel with dye, deposited on transparent film,
something to be used to make custom photographic filters. The film must be
very thin, to avoid optical distortions due wavy surface caused by mounting.
In that case, how you would make a 4 x 6" screen without film collapsing?
Please, explain the construction.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Mark Anton" <heightstv@...>
To: <TekScopes@...>
Sent: Thursday, March 04, 2004 5:29 PM
Subject: RE: [TekScopes] 475A filter, protective cap availability?



I think i might have mentioned before on this list, an item that works
well
for a screen filter is lighting gel material. You can pick the
color....use
one that is close to the color of the trace. A musical intrument repair
shop should possibly have some. The only to be careful of is not too get
one that is too opaque. Then you would have to turn up intensity farther
than needed to view the trace. I have used gel material on several scopes
now and works well. It isnt just for looks either...the reason it is
there
is to provide a higher contrast trace. vs seeing a white background.

Maybe someone else might know of where you could get a cover.

Mark Anton, Owner
Heights TV & VCR Service
3946 Central Ave. NE
Columbia Heights MN, 55421

Phone is 763-789-1767

(area code formerly 612)





----Original Message Follows----
From: timothy.urban@...
To: <TekScopes@...>
Subject: [TekScopes] 475A filter, protective cap availability?
Date: Wed, 3 Mar 2004 08:21:34 -0500

Got a nice working 475A, would like to replace the original blue/green CRT
filter with a nice sharp new one. Ar they commonly available?

Also need the protective cap that fits over the face of the scope - what
do these go for, and are there any better sources for them?

Thanks

Tim
N5IIT

_________________________________________________________________
FREE pop-up blocking with the new MSN Toolbar ??? get it now!






Yahoo! Groups Links
Re: Bias batteries in 7S14

pe1fbo
 

The 7S14 batteries have a voltage of 1.35 volts, New silver oxide
batteries are about 1.55 volts. You can replace these mercury types
safely with silver oxide types in a 7S14. I have done this about a
year ago and worked perfectly. Empty or nearly empty batteries
showed on mine an increased noise band (mind you they where not
complete dead).

After replacemend I did a recal on the unit, especially the
avalanche voltage, loop gain, DC bal and MEM bal are affecting the
noise.

Fred de Vries
Re: TEK 2753P Scare

Craig Sawyers
 

I have no idea what happened, and no idea
how it was fixed. I am just grateful that my spectrum
analyzer is alive again. I felt "blind" without it.
It is both a massive relief and deeply worrying when this sort of thing
happens. My 7L5 has got a similar quirk - the spectrum will shoot off
800kHz up the display from the reference dot - and then will come back and
jitter around, settle down for a while then - back up to 800kHz.

OK - an intermittent fault I hear you say - probably in the PLL. Heh - so
far it has defied attempts to find it; seems to obey some qunatum mechanical
behaviour: as soon as you offer it violence by trying to fix it, it settles
down for a few hours. Until I really want to use it again, that is.

But good luck with the 2753P - at least like my 7L5, it isn't *really* bust,
just being an awkward SOB.

Craig
Re: TEK 2753P Scare

John Miles
 

I figured the front end had kicked the bucket. I tried the
calibrate procedure and it failed right away.
Why would you assume that? This failure wouldn't have anything to do with
the front end. It sounds like a CPU glitch of some sort. The problem's not
likely to be gone forever, but not likely to put the analyzer totally out of
commission, either.

If it happens again, try turning off digital storage and see if that makes a
difference.

-- john KE5FX
GR on eBay

Craig Sawyers
 

Here's another piece of early GR stuff I saw on eBay just now - item
3801842023. This is an 804C UHF signal generator. Looks like it is 1940's
(it certainly predates the 1956 catalog that I have).

Anyway, the seller has this listed for $8 on buy-it-now for anyone
interested in this sort of gear.

Craig
TEK 2753P Scare

xaos
 

My 2753P Spectrum analyzer gave me the scare of my life.

I had not used the unit in about a month, but tonight I built
a filter and I had to see the response. I have a TR503
Tracking generator and both units are perfect
for checking filter bandwidth.

I had the 2753P on for about five minutes, and all of a sudden,
the display went nuts and all the front panel lights
wend black. The display still showed something but it was garbage.

All the front panel switches/buttons were dead except
the Peak/Average control which still managed to move the
averaging line up/down on the screen. Everything else was dead!

So I turned the machine off, unplugged the TR503, and put
50Ohm terminators on the 1stLo, 2ndLo SMA outputs.

I turned the machine on again, after 10 minutes, and all was
dead again. At this point, you can imagine how I felt.
There it was, my very nice (and expensive) spectrum analyzer
dead as a doornail.

I figured, here comes a very long troubleshooting session.
So I take the instrument down, and take out all the panels.
I don't have the Schematic Manual (That is volume two)
so I was really worried that I would be without my spectrum
analyzer for a very long time.

So I re-seat all the cards, and still nothing. I check the output
of the calibrator on my scope, and it was fine.

As a last resort, I moved the Time/Div knob from "AUTO"
to 1ms. Guess what..... The front panel flashed!!!!!!!!!
I left the Time/Div knob to 1ms, and I turned off the unit.

When I turned on the unit, all the front panel controls
became functional and the unit came back to life.
But still no signal on the display.

I figured the front end had kicked the bucket. I tried the
calibrate procedure and it failed right away.

At this point I became very depressed. I don't think
the front-end components of 2753P are still made.
However, by mistake I ran the calibration routine
with the Time/Div on 1ms and when it finished,
I could see some response on the display.

Sure enough, when I put the Time/Div back to
Auto, and ran the calibration routine, it passed.
The machine is now fully operational.

I have no idea what happened, and no idea
how it was fixed. I am just grateful that my spectrum
analyzer is alive again. I felt "blind" without it.

Sorry for the long post.

George Hrysanthopoulos, N2FGX
Re: Your document (Public Humiliation)

don falconer
 

I'm at the $2 windows saying it doesn't last 3..





Regards,



don f.

KR4XH

-----Original Message-----
From: Howard Matthews [mailto:hedgewarden@...]
Sent: Thursday, March 04, 2004 7:35 PM
To: TekScopes@...
Subject: [TekScopes] Re: Your document (Public Humiliation)



Grobbins got a virus!
Grobbins got a virus!
Neener, neener, neener!

Well, it is about time for a little public humiliation of the "no-
clues" that click on an attachment.

Unfortunately, Grobbins has helped to propagate a potentially
harmful virus/worm because he:

1. Did not have antivirus software up-to-date, AND
2. Opened an unsafe attachment from a source he did not really
recognize.

Sorry, but if we are going to limit these virus/worm attacks, we are
all going to have to be smarter. For a techie to fall for one of
these is embarrassing.

(Minor sympathy:) Some of these worms have been masquerading as
email bounces. It is very tempting to open the attachment, to see
which of your messages did not get delivered. CHECK THE TYPE! If
it is not .eml, it is not email.

OK, who else wants to be humiliated?

-Peer-pressure panderer, Howard

P.S. Grobbins probably doesn't even know he has started this
thread. But if he has an excuse other than "sorry", we could
probably all learn from it. (Hint, hint :)

P.P.S. Who wants to bet the moderator will trash this thread in
about 2 hours? I do! The only topical connection is that we are
all supposedly a little more tech-savy than the median computer user.


--- In TekScopes@..., grobbins@n... wrote:
Please have a look at the attached file.





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<> Service.
Re: Is it advisable to turn intensity down when scope is idle (but displaying a signal) to preserve CRT?

 

I generally turn down the intensity quite a bit when not viewing the trace. I watch for that on some of the older tube scopes..because if stops sweeping trace could end up as a dot.



Mark Anton, Owner
Heights TV & VCR Service
3946 Central Ave. NE
Columbia Heights MN, 55421

Phone is 763-789-1767

(area code formerly 612)





----Original Message Follows----
From: "Craig Sawyers" <c.sawyers@...>
To: <tekscopes@...>
Subject: RE: [TekScopes] Is it advisable to turn intensity down when scope is idle (but displaying a signal) to preserve CRT?
Date: Wed, 3 Mar 2004 23:47:51 -0000

Should the scope intensity be turned down to some degree or all the way
during this programming time to avoid phosphor degradation, or perhaps
should the scope be turned off during these intervals?
I usually turn down the intensity on the scope right down if I'm doing
something else for a while. But then again, I usually run at a fairly low
brightness anyway - there simply doesn't seem to be the need to crank it up
too far; you just need a clear trace, not a retina burning event.

Craig

_________________________________________________________________
Store more e-mails with MSN Hotmail Extra Storage ? 4 plans to choose from!

Re: Your document (Public Humiliation)

 

Grobbins got a virus!
Grobbins got a virus!
Neener, neener, neener!

Well, it is about time for a little public humiliation of the "no-
clues" that click on an attachment.

Unfortunately, Grobbins has helped to propagate a potentially
harmful virus/worm because he:

1. Did not have antivirus software up-to-date, AND
2. Opened an unsafe attachment from a source he did not really
recognize.

Sorry, but if we are going to limit these virus/worm attacks, we are
all going to have to be smarter. For a techie to fall for one of
these is embarrassing.

(Minor sympathy:) Some of these worms have been masquerading as
email bounces. It is very tempting to open the attachment, to see
which of your messages did not get delivered. CHECK THE TYPE! If
it is not .eml, it is not email.

OK, who else wants to be humiliated?

-Peer-pressure panderer, Howard

P.S. Grobbins probably doesn't even know he has started this
thread. But if he has an excuse other than "sorry", we could
probably all learn from it. (Hint, hint :)

P.P.S. Who wants to bet the moderator will trash this thread in
about 2 hours? I do! The only topical connection is that we are
all supposedly a little more tech-savy than the median computer user.

--- In TekScopes@..., grobbins@n... wrote:
Please have a look at the attached file.
Re: 475A filter, protective cap availability?

 

I think i might have mentioned before on this list, an item that works well for a screen filter is lighting gel material. You can pick the color....use one that is close to the color of the trace. A musical intrument repair shop should possibly have some. The only to be careful of is not too get one that is too opaque. Then you would have to turn up intensity farther than needed to view the trace. I have used gel material on several scopes now and works well. It isnt just for looks either...the reason it is there is to provide a higher contrast trace. vs seeing a white background.

Maybe someone else might know of where you could get a cover.

Mark Anton, Owner
Heights TV & VCR Service
3946 Central Ave. NE
Columbia Heights MN, 55421

Phone is 763-789-1767

(area code formerly 612)





----Original Message Follows----
From: timothy.urban@...
To: <TekScopes@...>
Subject: [TekScopes] 475A filter, protective cap availability?
Date: Wed, 3 Mar 2004 08:21:34 -0500

Got a nice working 475A, would like to replace the original blue/green CRT
filter with a nice sharp new one. Ar they commonly available?

Also need the protective cap that fits over the face of the scope - what
do these go for, and are there any better sources for them?

Thanks

Tim
N5IIT

_________________________________________________________________
FREE pop-up blocking with the new MSN Toolbar ? get it now!

201281 - 201300 of 208368