Date   

Re: LF Compensation of a 468 scope

Fabio Trevisan
 

David,
I keep asking myself when I'm going to have your writing synthesis
abilities.
It took me a couple of hours to write my last post (and we were probably
writing at the same time) and I couldn't manage to make it more concise
without compromising what I thought was essential...
And after I read your post it felt like a breeze to read! Short and easy to
grasp!
Simply amazing!
Back to the topic, I wonder if you would agree with my assertion that
splitting the LF comp, in the case of the 468, may come handy to assure a
faithful display of the stored waveform? especially considering that the
path through which the stored waveform is displayed doesn't have any sort
of adjustable compensation (besides the ones at the very output amplifier).
I know that this assumption doesn't hold true, or at least not necessary
for the 465b, since it doesn't have a stored waveform to display and that
any LF comp that could be slightly off on the vertical output amplifier
could still be harmlessly compensated at the pre-amps (or vice versa) but
maybe, since the circuits are alike, and since the 468 needed the
procedure, it was just sensible to make the procedure for the 465b the same
way.

Thanks for setting the bar high!

Brgrds,
Fabio.
P.S. my 464 is kind of on hold for a while, reason I haven't been posting
any feedback lately.
Been dealing with reorganization of my shack, to comply with some spousal
requirements (it was a mess!)

On Feb 16, 2017 10:12 PM, "David @DWH [TekScopes]" <
TekScopes@...> wrote:



I am sorry for being late replying to your post. I kept reading it
and thinking about it but then I get distracted.

The 464 and 466 are based off of the 465 and the 468 is based on the
465B. The 464/465/466 and the 465B/468 are really distinct series. So
the 465B is the one to compare to the 468.

I was able to figure out from the schematic what they are doing with
the Vert Alt Sync Pulse. The idea here is that driving the Vert Alt
Sync Pulse allows the vertical channel switch to generate a clean
square wave to drive the vertical amplifier with the peaks set by the
position controls.

As to why? Compensating the vertical amplifier separately from the
vertical preamplifiers should produce better results. Maybe doing the
calibration in two stages was faster or produced fewer units which
needed rework.

Notice though that the transient response is still compensated through
the vertical inputs because the edge produced by the channel switch is
not fast enough to calibrate this for the vertical amplifier.

The various mainframe oscilloscopes like the 7000 series also use
separate calibrations for the vertical signal path but that is
understandable given their modular design. The compact oscilloscopes
which replaced the 465B series did not use two stages of vertical
calibration though.

On Tue, 14 Feb 2017 18:24:10 -0000, you wrote:

Hi,

Does no-one have any observations on this? Perhaps I am being too
impatient.

I have ordered two of these BNC-to-Peltola adapters from Qservice, so I
have
to wait a while for the delivery before I can do much more. I remain
puzzled
that this scope and the 465B and no others in the 46x series (or the 475A)
use this method.

Colin.

From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 20:45
To: TekScopes@...
Subject: RE: [TekScopes] Gain calibration of a 468 scope

Continuing..

I have now got to the point of trying to adjust the Low-Frequency
Compensation. I believe that I have a little too much overshoot. The
manual
states that on the Vertical Output Board there are five pre-sets which
affect the compensation at 1, 10 and 100KHz. That is all very well, but
there is also a requirement set the 486 vertical mode to CH1 & CH2
alternate
and disconnect P686 from J686 on the interface board. This J686 is the
"Vert
Alt Sync". Now, either a 1KHz square-wave from a low-frequency generator
(an
SG502?), or the fast-rise negative output from the PG506 is connected to
J686 with a BNC-to-Peltola adaptor. I don't understand why this is
considered to be necessary or what it is actually doing.

Neither the 464 nor the 465 scopes use this protocol, but the 465B does.
Is
it really necessary, or could one simply leave P686/J686 connected and
just
adjust the pre-set on the Vertical Output Board?

Any help and information appreciated. I am learning a lot fiddling with
this
beast.

Colin.

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


Re: Tektronix 475 brightness variation

 

The response curve for the phosphor is not linear at high brightness
levels.

What you described is completely normal.

On 11 Feb 2017 22:41:38 +0000, you wrote:

Indeed I meant that with faster sweep speed the screen becomes dimmer.

David, if I press 10x magnification the screen becomes dimmer, but I would not say it is 10 times dimmer. Still I can see the trace. I assume that if it was 10 times dimmer I wouldn't see it.
The important thing for me is that you confirm that the issue is normal.
Thank you all!


Re: LF Compensation of a 468 scope

 

I am sorry for being late replying to your post. I kept reading it
and thinking about it but then I get distracted.

The 464 and 466 are based off of the 465 and the 468 is based on the
465B. The 464/465/466 and the 465B/468 are really distinct series. So
the 465B is the one to compare to the 468.

I was able to figure out from the schematic what they are doing with
the Vert Alt Sync Pulse. The idea here is that driving the Vert Alt
Sync Pulse allows the vertical channel switch to generate a clean
square wave to drive the vertical amplifier with the peaks set by the
position controls.

As to why? Compensating the vertical amplifier separately from the
vertical preamplifiers should produce better results. Maybe doing the
calibration in two stages was faster or produced fewer units which
needed rework.

Notice though that the transient response is still compensated through
the vertical inputs because the edge produced by the channel switch is
not fast enough to calibrate this for the vertical amplifier.

The various mainframe oscilloscopes like the 7000 series also use
separate calibrations for the vertical signal path but that is
understandable given their modular design. The compact oscilloscopes
which replaced the 465B series did not use two stages of vertical
calibration though.

On Tue, 14 Feb 2017 18:24:10 -0000, you wrote:

Hi,

Does no-one have any observations on this? Perhaps I am being too impatient.

I have ordered two of these BNC-to-Peltola adapters from Qservice, so I have
to wait a while for the delivery before I can do much more. I remain puzzled
that this scope and the 465B and no others in the 46x series (or the 475A)
use this method.

Colin.

From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 20:45
To: TekScopes@...
Subject: RE: [TekScopes] Gain calibration of a 468 scope

Continuing..

I have now got to the point of trying to adjust the Low-Frequency
Compensation. I believe that I have a little too much overshoot. The manual
states that on the Vertical Output Board there are five pre-sets which
affect the compensation at 1, 10 and 100KHz. That is all very well, but
there is also a requirement set the 486 vertical mode to CH1 & CH2 alternate
and disconnect P686 from J686 on the interface board. This J686 is the "Vert
Alt Sync". Now, either a 1KHz square-wave from a low-frequency generator (an
SG502?), or the fast-rise negative output from the PG506 is connected to
J686 with a BNC-to-Peltola adaptor. I don't understand why this is
considered to be necessary or what it is actually doing.

Neither the 464 nor the 465 scopes use this protocol, but the 465B does. Is
it really necessary, or could one simply leave P686/J686 connected and just
adjust the pre-set on the Vertical Output Board?

Any help and information appreciated. I am learning a lot fiddling with this
beast.

Colin.


Re: LF Compensation of a 468 scope

Fabio Trevisan
 

Hello Colin,
I studied a little bit the LF frequency compensation instructions for the
468 and I think I figured out what was their intention.
This scope uses the "Trig-View" internal "pseudo" 3rd channel to display
the Stored waveform.
Unlike the CH1 and CH2 analog pre-amplifiers which have their own Frequency
compensation networks, the "pseudo" 3rd channel input doesn't have any.
Therefore, in order for the display of the Stored waveform (which is low
frequency) to be faithful, it has to rely on the Low Frequency compensation
network of the OUTPUT Amplifier ALONE.
Since there's no way to feed a signal directly into the Vertical OUTPUT
Amplifier to adjust its LF compensation in an independent way, they came
out with this "trick":

By feeding a square wave to Vert Alt Sync Pulse input (on diagram 3,
coordinates 9A) they use the 'scope's own ALT switching circuit as a square
wave source to the Vertical OUTPUT section to be calibrated for LF
Compensation.

The instructions doesn't state very clearly what we should do with the CH1
or CH2 inputs themselves, but if we assume that they want us to leave them
both disconnected (or ideally, set at GND), then the only voltage coming
from each channel is the Channel Position level of each one.

Now, the "key" phrase from the setup instructions, on page 4-40 is:
"Set the generator output frequency to 1KHz AND ADJUST CH1 AND CH2 POSTION
CONTROLS FOR A 6-DIVISION DISPLAY.

By feeding the Vert Alt Sync signal with a waveform that is TWICE the
frequency of the Horizontal scan (which there's no way to happen if J686
would be wired to its regular signal), they created a way to make the scope
alternate from CH1 to CH2 in the middle of the Horizontal sweep and allow
us to see the waveform of its own switching from CH1 to CH2 and vv..

The waveform we see is therefore the transition from CH1 position's level
to CH2 position's level which are, each one, at a static level.

On table 4-14 (at the same page), it's easy to overlook its name, but it
tells "Vertical OUTPUT Low-Frequency compensation, and R335, R329 and R325
are there exclusively for the OUTPUT Amplifier 1Khz and 10KHz LF
compenasation.

Further down, by feeding square waves to CH1 and CH2 respectively, we have
R165 and R172 exclusive to CH1 preamplifier, and R371 and R373 exlcusive to
CH2.

100KHz adjust exists only on the Output amplifier and its adjustment is a
compromise between the "pseudo" 3rd channel for the Stored waveform, and
CH1 and CH2.

My scope (464, as well as other fully analog scopes) don't need that
adjusting of the OUTPUT Amplifier ALONE because the vertical signals are
ALWAYS coming through the pre-amplifiers.
It doesn't matter much if the pre-amplifiers are under compensated and the
output amplifier is over (or vv), as long as the overall result is correct.

Mistery solved.

FOR YOU, on the practical side, this step is the easiest one to achieve,
without requiring any special generator, because any TTL 1KHz oscillator
can do. The waveform doesn't need to be particularly flat or with no
overshoots because the "actual" waveform seen will be generated internally
by the CH1 / CH2 switcher.
You only need to assure that the signal arrives noiseless on U509A,

Rgrds,

Fabio




2017-02-15 10:17 GMT-02:00 'Colin Herbert' colingherbert@...
[TekScopes] <TekScopes@...>:



Hi Fabio,

I too have a 464, which was giving me problems a year or more ago. John
Sykes, who is a member of this forum and lived not far from me, gave it a
look-over and got it working fine. I also have two non-working 466s and a
475A as well as the 468 I am trying to get calibrated. I have original Tek
manuals for all of these scopes, plus the 465 and 465B manuals (I don’t own
these scopes, so it must be Acquisition Syndrome on my part). It is only
the 465B and 468 that have this procedure in the manuals. It has to be said
that the Vertical Output Amplifiers of these two look similar, but the
others being decidedly different. The 475A Vertical Output Amplifier uses
some hybrids which are no doubt proprietary. My electronic knowledge is
limited and self-taught, so I find difficulty working out some things. I,
too cannot see how the procedure is operating – what does “Vert Alt Sync”
have to do with anything here?

David Hess has said that the 468 is basically a 465B with the added DSO
hardware. So, while it is a complex and strange beast, there should be
probably more people who have a 465B and might have come across this.

Colin.

From: TekScopes@... [mailto:TekScopes@...]
Sent: 15 February 2017 11:20
To: TekScopes@...
Subject: Re: [TekScopes] LF Compensation of a 468 scope

Hello Colin,
You may get disappointed that my answer is more like a validation of your
problem than an answer properly said.
I own a 464 which Is slightly off in the low freq. compensation as well.
No matter I do, even setting all those trimpots to their minimum, the
square wave tops and bottoms remain still lightly inclined (the tops begin
higher and then fall a little and the bottoms the opposite).
I never noticed any instruction to disconnect some peltola internal cable
on my service manual, but I may have skipped something accidentally.
I fail to understand what in the world this signal of alternate trace sync
has anything to do with the subject of adjusting the lo-freq compensation.
Now you triggered my curiosity and I will look into the 468's SM to see if
I can see any explanation to your issue and perhaps I'll find some
explanation to my problem as well.
I was holding this problem (of mine) for a later time when I'd have solved
other minor issues that are also pending, but now it's itching!
Brgrds,
Fabio

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



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


Re: Tek492 blank CRT. Please help

Artek Manuals <manuals@...>
 

The test points are all covered in Vol-1 of the service manual on page
3-43 and 3-44 / figure 3-22

With the covers off check to see if you have a dull glow towards the
back of the CRT. If no glow could be the HV section or the CRT itself.
DO NOT TRY AND MEASURE the filament voltage ...very high voltages are
present here on the order of -3800 VDC. If it is HV problem then most
likely culprit will be the HV Multiplier module A74A1

Dave
manuals@...




On 2/16/2017 10:24 AM, pjwalczak@... [TekScopes] wrote:

Thank you Dave.

I walked through turn on procedure but could not get CRT show anything.
So, most likely I will need to check PSU. Do you know by any chance
where are test points for all output voltages from the PSU ?



--
Dave
Manuals@...
www.ArtekManuals.com


Re: Repairing Tektronix 492 input attenuator 119-1007-0x

ulf_r_k
 

Yep.


I made a repair on one of the chips in an attenuator in a 492P
Replacing it with a small and thin PTFE board (Rogers (something))
and using 0402 sized resistors resulted in a reasonably good
performance up to some 8 GHz. Above that frequency, there
was a drop in performance (accuracy), but the analyzer performed
well above 10 GHz when that specific chip was selected by
the attenuator control on the front panel.


Ulf - SM6GXV


Re: Tek492 blank CRT. Please help

pjwalczak@...
 

Thank you Dave.

I walked through turn on procedure but could not get CRT show anything.
So, most likely I will need to check PSU. Do you know by any chance
where are test points for all output voltages from the PSU ?


Re: OT Ripple Leader LTC-905

Jerry Massengale <jmassen418@...>
 

Hi,

In my opinion the ground system has too many paths. The pcb is grounded to
chassis at 2 mounting standoffs plus what looks like an added jumper to a
ground clip. This is a ground loop violation. The soldering is good enough
that I suspect a factory added wire. The bench has never shown any problems
with a huge variety of scopes and power supplies.

jerry

On Wed, Feb 15, 2017 at 10:42 AM, Vince Vielhaber vev@...
[TekScopes] <TekScopes@...> wrote:





On 02/15/2017 11:20 AM, Jerry Massengale jmassen418@...
[TekScopes] wrote:


all my outlets check good with my Dawson DET300

jerry
How well is the ground grounded?

Vince.
--
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
http://www.metalworkingfun.com


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


Re: OT Ripple Leader LTC-905

 

Hi :
As I know AC plug for LTC-905 is two wire type .
Have you swap the polarity for the plug to your outlet ?
Internal setting for your location rating ? 110V or 220V , wiring for the primary of transformer ?
RegardTony CheungFEB 16 2018

From: "Vince Vielhaber vev@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Thursday, February 16, 2017 12:42 AM
Subject: Re: [TekScopes] OT Ripple Leader LTC-905

 

On 02/15/2017 11:20 AM, Jerry Massengale jmassen418@...
[TekScopes] wrote:


all my outlets check good with my Dawson DET300

jerry
How well is the ground grounded?

Vince.
--
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
http://www.metalworkingfun.com
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[Non-text portions of this message have been removed]


Repairing Tektronix 492 input attenuator 119-1007-0x

David Feldman
 

I obtained one of these attenuators, known defective.

Appears that all three sections are blown but I've not done exhaustive testing.

The (three) small (5mm x 5mm) attenuator sub-assemblies - 10, 20 and 30 dB - are unobtainium at this point (a number of links/pointers to a retired tektronix person went nowhere.)

I'm considering whether feasible to make the attenuator useful again (even if it does not meet specs).

I found an article:

http://www.mods.dk/print.php?ArticleKey=a63ab4191e2d189854eb2723166b05a8

which details how Joerg (DL8DTL) repaired (by replacement with discrete SMD resistors) one of the sections. The link above takes you to the mods.dk "paywall" (yecch), but it is free to download one article per 4 days if you register, which itself has no cost.

Has anyone tried this (or any other) method to recover attenuator sections?

Thanks,

Dave

wb0gaz@...


Re: CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

Vince Vielhaber
 

No, in fact I'm sure it was not. It's just in a TM-515. It's made by CCS (Communication Control Systems).

Vince.

On 02/15/2017 05:23 PM, Artek Manuals manuals@... [TekScopes] wrote:
Vince

Are you sure it was manufactured by Tektronix? There have been a couple
of 3rd party vendors who made units that "fit" into a Tektronix
Tm500/5000 power unit

DAVE

manuals@...



On 2/15/2017 5:15 PM, 'Dennis Tillman' @Dennis_Tillman_W7pF [TekScopes]
wrote:

Hi Vince,

This is the very first and only one of these to show up in the past 15
years
that I have been monitoring Ebay for unusual TM500 plugins.

As you learn more about it I would like to hear what you find out.

Dennis Tillman W7PF

-----Original Message-----
Sent: Wednesday, February 15, 2017 9:29 AM
Subject: Re: [TekScopes] CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

It looks like a repackaged Tektronix 1401 spectrum analyzer.

Tom Bryan
N3AJA


Is anyone familiar with the CCS A-7 PANORAMIC SURVEILLANCE RECEIVER?
It's a 3 slot plugin for a TM-500.

I have one coming that I got off ebay, I was interested in the scope
and the TM-515 which came with both front and back covers. The A-7
was just an extra, but I can't find anything about it. BTW, CCS
stands for Communications Control Systems.

Vince.
------------------------------------
Posted by: "Tom B" <tbryan@...>
------------------------------------


Re: CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

Artek Manuals <manuals@...>
 

Vince

Are you sure it was manufactured by Tektronix? There have been a couple
of 3rd party vendors who made units that "fit" into a Tektronix
Tm500/5000 power unit

DAVE

manuals@...



On 2/15/2017 5:15 PM, 'Dennis Tillman' @Dennis_Tillman_W7pF [TekScopes]
wrote:

Hi Vince,

This is the very first and only one of these to show up in the past 15
years
that I have been monitoring Ebay for unusual TM500 plugins.

As you learn more about it I would like to hear what you find out.

Dennis Tillman W7PF

-----Original Message-----
Sent: Wednesday, February 15, 2017 9:29 AM
Subject: Re: [TekScopes] CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

It looks like a repackaged Tektronix 1401 spectrum analyzer.

Tom Bryan
N3AJA


Is anyone familiar with the CCS A-7 PANORAMIC SURVEILLANCE RECEIVER?
It's a 3 slot plugin for a TM-500.

I have one coming that I got off ebay, I was interested in the scope
and the TM-515 which came with both front and back covers. The A-7
was just an extra, but I can't find anything about it. BTW, CCS
stands for Communications Control Systems.

Vince.
------------------------------------
Posted by: "Tom B" <tbryan@...>
------------------------------------

--
Dave
Manuals@...
www.ArtekManuals.com


Re: CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

 

Hi Vince,

This is the very first and only one of these to show up in the past 15 years
that I have been monitoring Ebay for unusual TM500 plugins.

As you learn more about it I would like to hear what you find out.

Dennis Tillman W7PF

-----Original Message-----
Sent: Wednesday, February 15, 2017 9:29 AM
Subject: Re: [TekScopes] CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

It looks like a repackaged Tektronix 1401 spectrum analyzer.

Tom Bryan
N3AJA


Is anyone familiar with the CCS A-7 PANORAMIC SURVEILLANCE RECEIVER?
It's a 3 slot plugin for a TM-500.

I have one coming that I got off ebay, I was interested in the scope
and the TM-515 which came with both front and back covers. The A-7
was just an extra, but I can't find anything about it. BTW, CCS
stands for Communications Control Systems.

Vince.
------------------------------------
Posted by: "Tom B" <tbryan@...>
------------------------------------


Re: CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

Tom B
 

It looks like a repackaged Tektronix 1401 spectrum analyzer.

Tom Bryan
N3AJA


Is anyone familiar with the CCS A-7 PANORAMIC SURVEILLANCE RECEIVER?
It's a 3 slot plugin for a TM-500.

I have one coming that I got off ebay, I was interested in the scope and
the TM-515 which came with both front and back covers. The A-7 was just
an extra, but I can't find anything about it. BTW, CCS stands for
Communications Control Systems.

Vince.


Re: OT Ripple Leader LTC-905

Vince Vielhaber
 

On 02/15/2017 11:20 AM, Jerry Massengale jmassen418@... [TekScopes] wrote:


all my outlets check good with my Dawson DET300

jerry
How well is the ground grounded?

Vince.
--
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
http://www.metalworkingfun.com


Re: OT Ripple Leader LTC-905

Jerry Massengale <jmassen418@...>
 

all my outlets check good with my Dawson DET300

jerry

On Wed, Feb 15, 2017 at 8:13 AM, 'Bob' bobh@... [TekScopes] <
TekScopes@...> wrote:



When we moved into our house, many years ago, I had occasion to replace an
outlet. I found the green ground wire was not connected to the socket but
rolled up inside the outlet box. I bought one of those small polarity and
ground checkers to find the outlets which weren’t wired right. I then set
out to check every outlet in the house and found many had the same issue.
Some had reversed hot and neutral wires.

The reversed hot and neutral wiring is certainly a possibility which could
cause problems with equipment and be a safety hazard.
Bob.

From: Fabio Trevisan fabio.tr3visan@... [TekScopes]
Sent: Wednesday, February 15, 2017 3:52 AM
To: TekScopes@...
Subject: Re: [TekScopes] OT Ripple Leader LTC-905


Hi Jerry,
I realize now may be too late, as you made up tour mind to sell the thing
but...
It may be a long shot and I don't know your leader in particular but, since
Mark pointed out that the two wire model is susceptible to mains lead
neutral to phase inversion, I wonder if even the 3 wire model is also
susceptible.
In that case, the neutral and phase wires may be wired wrong in your wall
outlet and since the 3 prong plug won't let you reverse it, you could be
stuck to the problem just because of the wrong wiring of the wall
receptacle.
Even if you're not keeping it, it may still worth to check your wall
outlet.
Brgrds,
Fabio

On Feb 14, 2017 11:36 PM, "Jerry Massengale jmassen418@...
[TekScopes]" <TekScopes@...> wrote:

Hi,

Yes, mine has a 3 wire power cord and the green wire is tied to the chassis
as is the system ground. I looked at the 3 dc power busses and they are
clean and at the correct voltage. The output of the step generator looks
good at the output of the buffer. I am concerned with a very long ground
bus directly tied to earth. I was tempted to disconnect chassis gnd from
signal gnd but decided to sell it instead. Another issue is the 3 banana
jacks for the transistor connection are not on the standard 0.75 inch
spacing that fit my adapters. This is all part of my downsizing efforts. I
recently sold my 576 that I really liked. One option was to use a 7CT1N
with my 7704A, The other was to acquire the Leader LTC-905 and use it with
my 2465A. I put the 905 on ebay for a very low price and will soon put the
2465A up for sale.

jerry

On Tue, Feb 14, 2017 at 3:24 PM, Clark bclark207@... [TekScopes] <

TekScopes@...> wrote:

What does the earth connection connect to in the curve tracer? Mine has
an original two-wire cord with standard two-prong plug - not even
polarized.


On 02/14/2017 02:24 PM, Jerry Massengale jmassen418@...
[TekScopes] wrote:

Hi,

Replacing the 4 rectifiers greatly reduced the ripple. My trace looks
like
that shown in manual. I have decided to sell the LTC-905 and keep my
7CT1N.
This unit has the 3 wire power cable.

On Tue, Feb 14, 2017 at 6:33 AM, Clark bclark207@... [TekScopes] <
TekScopes@...> wrote:

Ripple, or phase error? - see section B on pg 3 in the users manual.
I
had the same problem, and solved it by reversing the curve tracer
plug
in the wall outlet.


On 02/13/2017 03:01 PM, Jerry Massengale jmassen418@...
[TekScopes] wrote:

Hi,

My just recieved Leader LTC-905 Curve Tracer has a small ripple on
the
display curves as displayed on my 2465A scope. The electrolytics in
the box
have good ESR. Suggestions?

jerry

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



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

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


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

Yahoo Groups Links











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


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

Yahoo Groups Links



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



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



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


CCS A-7 PANORAMIC SURVEILLANCE RECEIVER

Vince Vielhaber
 

Is anyone familiar with the CCS A-7 PANORAMIC SURVEILLANCE RECEIVER? It's a 3 slot plugin for a TM-500.

I have one coming that I got off ebay, I was interested in the scope and the TM-515 which came with both front and back covers. The A-7 was just an extra, but I can't find anything about it. BTW, CCS stands for Communications Control Systems.

Vince.
--
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
http://www.metalworkingfun.com


Re: Tek492 blank CRT. Please help

Chuck Harris
 

The 492 has a very compact power supply, where the 105C
ratings of all of its capacitors are being challenged
every time you run it.

I would suggest that before you do anything with a new
492, or 494 SA, you carefully remove the power supply,
and replace all of its filter caps with the very best
low impedance, high ripple current, long life 105C
capacitors you can buy.

Stay away from EBAY! This is too much work to risk on
Chinese counterfeits. Use Mouser or Digikey.

You want real UnitedChemiCom, or Nichicon, or Panasonic.
You want a minimum of a 10,000 hour life rating.

What I think you will find is a group of capacitors where
they have gotten so hot that the heat shrink tubing that
has the labeling, and makes them all insulated and pretty
will have shrunk so much that it won't cover the ends of
the capacitor anymore.

-Chuck Harris

Lars Ahlström lea56@... [TekScopes] wrote:

Look for shorted tantal capacitors (general, typical) and check psu voltages.
/Lars


-------- Originalmeddelande -------- Från: "pjwalczak@... [TekScopes]"
<TekScopes@...> Datum:2017-02-15 09:16 (GMT+01:00) Till:
TekScopes@... Kopia: Rubrik: [TekScopes] Tek492 blank CRT. Please help


I have an old Tek492. Bought it second hand, but was working fine for a couple of
years. Today when I have switched it on, after a long break (almost a year) - it
powered OK, all controls seems to be ok, but there is nothing shown on the CRT.
Can anybody share some tips what can be done to find the cause and fix it ?



Re: OT Ripple Leader LTC-905

bobh@joba.com
 

When we moved into our house, many years ago, I had occasion to replace an outlet. I found the green ground wire was not connected to the socket but rolled up inside the outlet box. I bought one of those small polarity and ground checkers to find the outlets which weren’t wired right. I then set out to check every outlet in the house and found many had the same issue. Some had reversed hot and neutral wires.

The reversed hot and neutral wiring is certainly a possibility which could cause problems with equipment and be a safety hazard.
Bob.


From: Fabio Trevisan fabio.tr3visan@... [TekScopes]
Sent: Wednesday, February 15, 2017 3:52 AM
To: TekScopes@...
Subject: Re: [TekScopes] OT Ripple Leader LTC-905


Hi Jerry,
I realize now may be too late, as you made up tour mind to sell the thing
but...
It may be a long shot and I don't know your leader in particular but, since
Mark pointed out that the two wire model is susceptible to mains lead
neutral to phase inversion, I wonder if even the 3 wire model is also
susceptible.
In that case, the neutral and phase wires may be wired wrong in your wall
outlet and since the 3 prong plug won't let you reverse it, you could be
stuck to the problem just because of the wrong wiring of the wall
receptacle.
Even if you're not keeping it, it may still worth to check your wall outlet.
Brgrds,
Fabio

On Feb 14, 2017 11:36 PM, "Jerry Massengale jmassen418@...
[TekScopes]" <TekScopes@...> wrote:

Hi,

Yes, mine has a 3 wire power cord and the green wire is tied to the chassis
as is the system ground. I looked at the 3 dc power busses and they are
clean and at the correct voltage. The output of the step generator looks
good at the output of the buffer. I am concerned with a very long ground
bus directly tied to earth. I was tempted to disconnect chassis gnd from
signal gnd but decided to sell it instead. Another issue is the 3 banana
jacks for the transistor connection are not on the standard 0.75 inch
spacing that fit my adapters. This is all part of my downsizing efforts. I
recently sold my 576 that I really liked. One option was to use a 7CT1N
with my 7704A, The other was to acquire the Leader LTC-905 and use it with
my 2465A. I put the 905 on ebay for a very low price and will soon put the
2465A up for sale.

jerry

On Tue, Feb 14, 2017 at 3:24 PM, Clark bclark207@... [TekScopes] <

TekScopes@...> wrote:

What does the earth connection connect to in the curve tracer? Mine has
an original two-wire cord with standard two-prong plug - not even
polarized.


On 02/14/2017 02:24 PM, Jerry Massengale jmassen418@...
[TekScopes] wrote:

Hi,

Replacing the 4 rectifiers greatly reduced the ripple. My trace looks
like
that shown in manual. I have decided to sell the LTC-905 and keep my
7CT1N.
This unit has the 3 wire power cable.

On Tue, Feb 14, 2017 at 6:33 AM, Clark bclark207@... [TekScopes] <
TekScopes@...> wrote:

Ripple, or phase error? - see section B on pg 3 in the users manual. I
had the same problem, and solved it by reversing the curve tracer plug
in the wall outlet.


On 02/13/2017 03:01 PM, Jerry Massengale jmassen418@...
[TekScopes] wrote:

Hi,

My just recieved Leader LTC-905 Curve Tracer has a small ripple on
the
display curves as displayed on my 2465A scope. The electrolytics in
the box
have good ESR. Suggestions?

jerry

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







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

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


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

Yahoo Groups Links



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



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



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

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


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

Yahoo Groups Links



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

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


Re: OT Ripple Leader LTC-905

Jerry Massengale <jmassen418@...>
 

Fabio,

When i looked across R127 the pulses were of equal height. This is the
rectified transformer output.I noticed that the traces shown in the manual
looked like unaveraged DSO traces. Thanks for suggestions.

jerry

On Wed, Feb 15, 2017 at 4:52 AM, Fabio Trevisan fabio.tr3visan@...
[TekScopes] <TekScopes@...> wrote:



Hi Jerry,
I realize now may be too late, as you made up tour mind to sell the thing
but...
It may be a long shot and I don't know your leader in particular but, since
Mark pointed out that the two wire model is susceptible to mains lead
neutral to phase inversion, I wonder if even the 3 wire model is also
susceptible.
In that case, the neutral and phase wires may be wired wrong in your wall
outlet and since the 3 prong plug won't let you reverse it, you could be
stuck to the problem just because of the wrong wiring of the wall
receptacle.
Even if you're not keeping it, it may still worth to check your wall
outlet.
Brgrds,
Fabio

On Feb 14, 2017 11:36 PM, "Jerry Massengale jmassen418@...

[TekScopes]" <TekScopes@...> wrote:

Hi,

Yes, mine has a 3 wire power cord and the green wire is tied to the chassis
as is the system ground. I looked at the 3 dc power busses and they are
clean and at the correct voltage. The output of the step generator looks
good at the output of the buffer. I am concerned with a very long ground
bus directly tied to earth. I was tempted to disconnect chassis gnd from
signal gnd but decided to sell it instead. Another issue is the 3 banana
jacks for the transistor connection are not on the standard 0.75 inch
spacing that fit my adapters. This is all part of my downsizing efforts. I
recently sold my 576 that I really liked. One option was to use a 7CT1N
with my 7704A, The other was to acquire the Leader LTC-905 and use it with
my 2465A. I put the 905 on ebay for a very low price and will soon put the
2465A up for sale.

jerry

On Tue, Feb 14, 2017 at 3:24 PM, Clark bclark207@... [TekScopes] <

TekScopes@...> wrote:

What does the earth connection connect to in the curve tracer? Mine has
an original two-wire cord with standard two-prong plug - not even
polarized.


On 02/14/2017 02:24 PM, Jerry Massengale jmassen418@...
[TekScopes] wrote:

Hi,

Replacing the 4 rectifiers greatly reduced the ripple. My trace looks
like
that shown in manual. I have decided to sell the LTC-905 and keep my
7CT1N.
This unit has the 3 wire power cable.

On Tue, Feb 14, 2017 at 6:33 AM, Clark bclark207@... [TekScopes] <
TekScopes@...> wrote:

Ripple, or phase error? - see section B on pg 3 in the users manual.
I
had the same problem, and solved it by reversing the curve tracer
plug
in the wall outlet.


On 02/13/2017 03:01 PM, Jerry Massengale jmassen418@...
[TekScopes] wrote:

Hi,

My just recieved Leader LTC-905 Curve Tracer has a small ripple on
the
display curves as displayed on my 2465A scope. The electrolytics in
the box
have good ESR. Suggestions?

jerry

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







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

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


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

Yahoo Groups Links







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



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

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


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

Yahoo Groups Links



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

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