Hi Robert,

you received my direct mail ????


Herbert


Am 24.09.2012 05:59, schrieb dreadlk:

Hi Herbert

Thanks, I had seen those numbers but I thought they would have a
corresponding long part number like the one I see on Ebay and in the
SV manual for other parts. I was looking through the PDF for it but
never found it, now I know why LOL.

Thanks for the offer Herb I may take you up on it pretty soon, maybe
ask you instead for some photos if possible of how yours are routed so
I can see where to make the bends. For now I think I can just estimate
the amount I will need and buy 25% extra just in case.

BTW any suggestions on a good online place to order the parts? Digikey
or is there some place better?

Thank you
Robert

--- In TekScopes@... <mailto:TekScopes%40yahoogroups.com>,
Measurement <measurement@> wrote:

Hi,

the parts are named W52 and W53 and W55.

- W55 is solder end to SMB
- W52 SMA-male to N-female
- W53 SMA-male to SMA-male

Would it help, to know the length ???
I can measure in mz 2712 !

Herbert


Am 23.09.2012 21:48, schrieb dreadlk:

For starters I found this on ebay but it looks too short.

<>

<
<>>

I am scouring the 2712 SVC Manual looking for the correct part number
but so far no luck, it is diagramed but the part numbers are not
listed for any of the cables.

--- In TekScopes@...

<mailto:TekScopes%40yahoogroups.com>
<mailto:TekScopes%40yahoogroups.com>,

"dreadlk" <dreadlk@> wrote:

Thanks for the information, I agree with both of your assessments.

It was easy to find the Cables in a flex format so I went out and
bought some on day one. Now that I read your posts I know it won't
work and my dilemma is that I have no idea where to find the Semi
Rigid versions. I am going to do some searching but I have a

feeling I

am going to need a lot of luck on my side to make this happen. If the
unit will error out it makes little sense for me to proceed further
until I locate these cables so at this point I am going to mark out
the plate for cutting and drilling based on Jims info and then when I
know where to get the needed cables I will start the cutting and

drilling.

If anybody has any of these cables and is willing to sell them

please let me know or if you have any ideas on a source that might
sell them the info would be greatly appreciated.

Robert
KD8MJR

--- In TekScopes@...

<mailto:TekScopes%40yahoogroups.com>

<mailto:TekScopes%40yahoogroups.com>, "Rich Miller" <av8torrich@>

wrote:

Hello Robert:



With regard to the rigid coax cable used to connect the TG to the

front

panel, I think you are going to want to use this. While at low

frequency

other types of cable may work fine, when you get into microwave

you may run

into a problem with the TG Gain Flatness Normalization. If the

output of the

TG is off by more than +/-3dBm (This is from memory so double

check), it

will show up as a fault when you first attempt to normalize.



Rich, AJ3G



From: TekScopes@...

<mailto:TekScopes%40yahoogroups.com>

<mailto:TekScopes%40yahoogroups.com>

[mailto:TekScopes@... <mailto:TekScopes%40yahoogroups.com>

<mailto:TekScopes%40yahoogroups.com>] On Behalf

Of dreadlk
Sent: Friday, September 21, 2012 2:33 PM
To: TekScopes@...

<mailto:TekScopes%40yahoogroups.com> <mailto:TekScopes%40yahoogroups.com>

Subject: [TekScopes] Re: Help I got a Tracking Generator for my

Tek 2710 but

how do I install it?







Hi Jim

Thank you so much for the reply. I do have a VR BW board in that

cavity and

I received the TG with no cables at all, I will have to figure

out

how to

obtain the needed parts and where to source them.
I was wondering if flexible cables with SMA and Type N will work

or does it

have to be the rigid stuff? I obtained a copy of the 2712 SV

Manual and am

going to look through it tonight to try and get a better idea of

what I am

dealing with, I want to thank you for your post, it certainly

clarified

things for me, I hope I am up to the task of doing this Job as I

must admit

I am a bit worried about messing up my 2710 it has been

absolutely a

pleasure to use over the years and is in fantastic condition.

Let me ask you Jim is there any chance of having my proverbial

cake and

eating it too?
I mean could I leave in the VR BW board and run cables to the

Back

of the

unit and put the TG in a separate enclosure, kind of like a DIY

2707? I am

just wondering if anybody has ever done that, I would imagine

that

it might

not be practical but I just wanted to get your opinion.

Anyway Jim I am going to take out the VR BW board and see what I

am dealing

with. If you have any suggestions please post them, and thanks so

much for

your help.

Robert
KD8MJR

--- In TekScopes@...

<mailto:TekScopes%40yahoogroups.com>

<mailto:TekScopes%40yahoogroups.com>
<mailto:TekScopes%40yahoogroups.com> ,

"Jim" <jflan@> wrote:

Hi Robert -
The TG mounts in the cavity on the left side of the analyzer.

This also is

the same cavity which houses the Variable Resolution BW board.

You

can only

use one or the other, not both. It wasn't clear whether you have

the VR BW

board or not.

There are two semi-rigid cables that will need to be made. One

routes the

RF to the front panel and has an SMA on one end and a Type N on

the other.

The other routes the 2nd LO (2 GHz) to the TG. Did you receive

these cables?

The ribbon cable will plug into the main power supply board to

provide the

interface. in fact, I just remembered that one end of the ribbon

cable is

crimped to a IDC connector that is *soldered* to the power supply

board. The

other end uses at typical IDC connector that will plug into the

TG. The 2712

(not 2710) service manual has a block diagram that will aide in

making the

necessary connections. This manual is down loadable from the

Tek.com site

and will be a better reference for what you are wanting to do.

You

will have

some work to do to get your TG up and running. Take your time and

it will go

smoothly.

Good luck.
Jim
WB5KYE


--- In TekScopes@...

<mailto:TekScopes%40yahoogroups.com>

<mailto:TekScopes%40yahoogroups.com>
<mailto:TekScopes%40yahoogroups.com> ,

"dreadlk" <dreadlk@> wrote:

I posted about a month ago about searching for an internal

tracking

generator for my 2710 SA and I finally found one from an old

Tektronix

dealer.

Now I have this unit with Id No 119-3889-07 it's in a golden

colored all

metal case with 3 female SMA connectors and a 10 pin 2 row IDC

connector.

Luckily I found several old Mobo serial connectors that are

the right

size but only use 9 of the 10 pins so I removed the wire and made

a 10 wire

straight pin to pin cable from the connector ends.

Now I open up my 2710 to locate grounds and power pins on

this IDC

connector and have a WTF moment. Where the Heck does this

thing go!! I

remember a side section that was free but the unit won't fit and

all the

card slots are used up! Plus its just too big, so I have no clue

how this

fits into a 2710.

I can find nothing on the net about this Option 04 tracking

generator,

it's not even listed in the 2710 service manual but I have seen

several 2710

sold with Tracking Gens built in and the guy who sold it to me

told me it

works with the 2710 Arggggh....

Anybody have any idea what I should do next? I can't even

locate the 10

pin connector that it supposed to plug into much less fit the

unit

into my

2710. Man I hope I did not waste all that money, I am having

serious regrets

now. Sorry if this comes of as a Crazy Rant but I should have

done my

homework before making this purchase, I am upset with myself.

Robert
KD8MJR

Robert -

The ribbon cable that makes the connection between the power supply board and the TG appears missing. The end that connects to the TG is a standard female IDC ribbon connector. The other end is a board mount IDC connector that is NOT pluggable but soldered to the circuit board. I bought some of these years ago from Berg (I think). I did find some photos of a T&B version (although it is a 20 pin and you need a 10 pin) I placed a picture under the 'PHOTO' section names '2710/11/12 Tracking Generator Cable'.

take care.
Jim

Hi Jim, Rich and Rolynn

I am so sorry I have not been back to reply for almost a week but my Dog got really sick on Sunday and looked like he was not going to make it, so I pretty much dropped everything and took 3 days off from work so I could get him to the Vet so they could figure out what had happened (seems like he contracted some kind of massive cardio infection).

After that he was home on Meds but very sick so I stayed with him during the days and my wife took care of him in the evenings while I slept and then I took over the night shift when she went to bed. He is doing much better now but is still not out of the woods yet.

I wanted you guys to know that I took the advice from Rolynn and purchased an ebay auction supposedly for all the cables for a 27xx. The only problem is that the guy could not guarantee me that the TG cables are in the lot but looking at the pictures I think they are there.

Can you guys take a look and tell me if I got lucky or picked door Number 2 (LOL).

Scroll down to the bottom he has multiple pictures.



I pulled the trigger on this just after the Dog got sick, so I had very little time to really check it out properly but I figured Rolynn knew that the cables where in the pictures.

I will be back soon, but things are still a bit rough because now I have a serious back log at work but I will try to log in again tommorow.

Thanks again for all the help guys.
Robert
KD8MJR





--- In TekScopes@..., "dreadlk" <dreadlk@> wrote:

Rolynn Thank you so very much for that :)
I will be in touch soon.

--- In TekScopes@..., "ROLYNN PRECHTL K7DFW" <k7dfw@> wrote:

I think my biggest hurdle is going to be getting the proper Semi Rigid cables that are needed I
have no clue where to buy these........

To get a good copy of the manual, see . Dave is not expensive and you will be hard put to find better scans.

Note that there are two versions of the manual, early and late, and it goes by the serial number.

As to your ohmmeter question, I always make the measurement using the correct polarity on the meter. Mainly this is to avoid semiconductor junction biasing that could give false readings.

The main failure mode for tantalums is overvoltage causing breakdown of the dielectric. This causes a gross overcurrent condition that can result in a small fire unless there is some form of current limiting.

Regards,
Tom


----- Original Message -----
From: pdxareaid
To: TekScopes@...
Sent: Saturday, September 29, 2012 12:00 PM
Subject: [TekScopes] 465B schematics and tantalum curiosity



Greetings,
I am waiting on replacement tantalums to show up to complete my 465B scope.

While I was waiting, I thought I would dive in and do a tant survey and look for dry tants in circuits that are dangerously close to their rated voltage (and therefore subject to early failure). I have already found a couple without really looking so i thought a more in depth look might be worthwhile. I found the schematics in the service manual are not clear enough to read the component numbers (Cxxxx etc.) I could probably muddle thru it, making good guesses and cross checking, but I was wondering if someone had a better set of schematics for the 465B. I have both the standard pdf and djvu versions of the service manual (found at ) and they are both problematic. I asked this question once for the 465M and got lucky with "try this". hoping to get lucky for the 465B.

Another question: I know very little about dry tants but I do know that even a brief reverse polarity connection will damage the tant. Does one need to worry about such when looking for shorted tants, realizing the volt meter is providing its own polarity for resistance readings? ie. Are tants sensitive to such a miniscule current? If not a practical worry...academically: is there some small degradation? I see there are people in here with lots of tant knowledge that might be able to comment.
Phil
ps. If i do the survey, I will post the results for 465B owners to fret over :-)

I have an original manual for that model so if you tell me which pages you need, I will find time to scan them and shoot it to you.?? I assume you want the parts list, but if you need the diagrams too I could do that in sections.

Bob

--- On Sat, 9/29/12, pdxareaid <public_email@...> wrote:

From: pdxareaid <public_email@...>
Subject: [TekScopes] 465B schematics and tantalum curiosity
To: TekScopes@...
Date: Saturday, September 29, 2012, 9:00 AM
















??









Greetings,

I am waiting on replacement tantalums to show up to complete my 465B scope.



While I was waiting, I thought I would dive in and do a tant survey and look for dry tants in circuits that are dangerously close to their rated voltage (and therefore subject to early failure). I have already found a couple without really looking so i thought a more in depth look might be worthwhile. I found the schematics in the service manual are not clear enough to read the component numbers (Cxxxx etc.) I could probably muddle thru it, making good guesses and cross checking, but I was wondering if someone had a better set of schematics for the 465B. I have both the standard pdf and djvu versions of the service manual (found at ) and they are both problematic. I asked this question once for the 465M and got lucky with "try this". hoping to get lucky for the 465B.



Another question: I know very little about dry tants but I do know that even a brief reverse polarity connection will damage the tant. Does one need to worry about such when looking for shorted tants, realizing the volt meter is providing its own polarity for resistance readings? ie. Are tants sensitive to such a miniscule current? If not a practical worry...academically: is there some small degradation? I see there are people in here with lots of tant knowledge that might be able to comment.

Phil

ps. If i do the survey, I will post the results for 465B owners to fret over :-)

To get a good copy of the manual, see . Dave is not expensive and you will be hard put to find better scans.

Note that there are two versions of the manual, early and late, and it goes by the serial number.

As to your ohmmeter question, I always make the measurement using the correct polarity on the meter. Mainly this is to avoid semiconductor junction biasing that could give false readings.

The main failure mode for tantalums is overvoltage causing breakdown of the dielectric. This causes a gross overcurrent condition that can result in a small fire unless there is some form of current limiting.

Regards,
Tom


----- Original Message -----
From: pdxareaid
To: TekScopes@...
Sent: Saturday, September 29, 2012 12:00 PM
Subject: [TekScopes] 465B schematics and tantalum curiosity



Greetings,
I am waiting on replacement tantalums to show up to complete my 465B scope.

While I was waiting, I thought I would dive in and do a tant survey and look for dry tants in circuits that are dangerously close to their rated voltage (and therefore subject to early failure). I have already found a couple without really looking so i thought a more in depth look might be worthwhile. I found the schematics in the service manual are not clear enough to read the component numbers (Cxxxx etc.) I could probably muddle thru it, making good guesses and cross checking, but I was wondering if someone had a better set of schematics for the 465B. I have both the standard pdf and djvu versions of the service manual (found at ) and they are both problematic. I asked this question once for the 465M and got lucky with "try this". hoping to get lucky for the 465B.

Another question: I know very little about dry tants but I do know that even a brief reverse polarity connection will damage the tant. Does one need to worry about such when looking for shorted tants, realizing the volt meter is providing its own polarity for resistance readings? ie. Are tants sensitive to such a miniscule current? If not a practical worry...academically: is there some small degradation? I see there are people in here with lots of tant knowledge that might be able to comment.
Phil
ps. If i do the survey, I will post the results for 465B owners to fret over :-)

From: pdxareaid
Subject: [TekScopes] 465B schematics and tantalum curiosity
To: TekScopes@...
Date: Saturday, September 29, 2012, 9:00 AM

?

Greetings,
I am waiting on replacement tantalums to show up to complete my 465B scope.

While I was waiting, I thought I would dive in and do a tant survey and look for dry tants in circuits that are dangerously close to their rated voltage (and therefore subject to early failure). I have already found a couple without really looking so i thought a more in depth look might be worthwhile. I found the schematics in the service manual are not clear enough to read the component numbers (Cxxxx etc.) I could probably muddle thru it, making good guesses and cross checking, but I was wondering if someone had a better set of schematics for the 465B. I have both the standard pdf and djvu versions of the service manual (found at ) and they are both problematic. I asked this question once for the 465M and got lucky with "try this". hoping to get lucky for the 465B.

Another question: I know very little about dry tants but I do know that even a brief reverse polarity connection will damage the tant. Does one need to worry about such when looking for shorted tants, realizing the volt meter is providing its own polarity for resistance readings? ie. Are tants sensitive to such a miniscule current? If not a practical worry...academically: is there some small degradation? I see there are people in here with lots of tant knowledge that might be able to comment.
Phil
ps. If i do the survey, I will post the results for 465B owners to fret over :-)

----- Original Message -----

From: pdxareaid

To: TekScopes@...

Sent: Saturday, September 29, 2012 12:00 PM

Subject: [TekScopes] 465B schematics and tantalum curiosity

?

Greetings,
I am waiting on replacement tantalums to show up to complete my 465B scope.

While I was waiting, I thought I would dive in and do a tant survey and look for dry tants in circuits that are dangerously close to their rated voltage (and therefore subject to early failure). I have already found a couple without really looking so i thought a more in depth look might be worthwhile. I found the schematics in the service manual are not clear enough to read the component numbers (Cxxxx etc.) I could probably muddle thru it, making good guesses and cross checking, but I was wondering if someone had a better set of schematics for the 465B. I have both the standard pdf and djvu versions of the service manual (found at ) and they are both problematic. I asked this question once for the 465M and got lucky with "try this". hoping to get lucky for the 465B.

Another question: I know very little about dry tants but I do know that even a brief reverse polarity connection will damage the tant. Does one need to worry about such when looking for shorted tants, realizing the volt meter is providing its own polarity for resistance readings? ie. Are tants sensitive to such a miniscule current? If not a practical worry...academically: is there some small degradation? I see there are people in here with lots of tant knowledge that might be able to comment.
Phil
ps. If i do the survey, I will post the results for 465B owners to fret over :-)

Greetings,
I am waiting on replacement tantalums to show up to complete my 465B scope.

While I was waiting, I thought I would dive in and do a tant survey and look for dry tants in circuits that are dangerously close to their rated voltage (and therefore subject to early failure). I have already found a couple without really looking so i thought a more in depth look might be worthwhile. I found the schematics in the service manual are not clear enough to read the component numbers (Cxxxx etc.) I could probably muddle thru it, making good guesses and cross checking, but I was wondering if someone had a better set of schematics for the 465B. I have both the standard pdf and djvu versions of the service manual (found at ) and they are both problematic. I asked this question once for the 465M and got lucky with "try this". hoping to get lucky for the 465B.

Another question: I know very little about dry tants but I do know that even a brief reverse polarity connection will damage the tant. Does one need to worry about such when looking for shorted tants, realizing the volt meter is providing its own polarity for resistance readings? ie. Are tants sensitive to such a miniscule current? If not a practical worry...academically: is there some small degradation? I see there are people in here with lots of tant knowledge that might be able to comment.
Phil
ps. If i do the survey, I will post the results for 465B owners to fret over :-)

I built a homemade normalizer using a 22pf 1206 cap and a 1Meg 1206 resistor. I expected it work be a 22pf normalizer. It produces a square wave with my 7A16P 20pf amplifier but shows a bit of low freq rolloff on the leading edge with a 7A26 or 7A18. The 22pf caps I am using seem to be a bit over 22pf. I am puzzled that it looks better with the 7A16p than the 7A26. How are normalizers calibrated?



Jerry Massengale

----- Original Message -----

From: jerry massengale

To: hp_agilent_equipment@... ; lecroy_owners_group@... ; tekscopes@...

Sent: Saturday, September 29, 2012 8:32 AM

Subject: [TekScopes] Normalizer calibration

?

Hi,

I built a homemade normalizer using a 22pf 1206 cap and a 1Meg 1206 resistor. I expected it work be a 22pf normalizer. It produces a square wave with my 7A16P 20pf amplifier but shows a bit of low freq rolloff on the leading edge with a 7A26 or 7A18. The 22pf caps I am using seem to be a bit over 22pf. I am puzzled that it looks better with the 7A16p than the 7A26. How are normalizers calibrated?

Jerry Massengale

Hi Jim, Rich and Rolynn

I am so sorry I have not been back to reply for almost a week but my Dog got really sick on Sunday and looked like he was not going to make it, so I pretty much dropped everything and took 3 days off from work so I could get him to the Vet so they could figure out what had happened (seems like he contracted some kind of massive cardio infection).

After that he was home on Meds but very sick so I stayed with him during the days and my wife took care of him in the evenings while I slept and then I took over the night shift when she went to bed. He is doing much better now but is still not out of the woods yet.

I wanted you guys to know that I took the advice from Rolynn and purchased an ebay auction supposedly for all the cables for a 27xx. The only problem is that the guy could not guarantee me that the TG cables are in the lot but looking at the pictures I think they are there.

Can you guys take a look and tell me if I got lucky or picked door Number 2 (LOL).

Scroll down to the bottom he has multiple pictures.



I pulled the trigger on this just after the Dog got sick, so I had very little time to really check it out properly but I figured Rolynn knew that the cables where in the pictures.

I will be back soon, but things are still a bit rough because now I have a serious back log at work but I will try to log in again tommorow.

Thanks again for all the help guys.
Robert
KD8MJR





--- In TekScopes@..., "dreadlk" <dreadlk@> wrote:

Rolynn Thank you so very much for that :)
I will be in touch soon.

--- In TekScopes@..., "ROLYNN PRECHTL K7DFW" <k7dfw@> wrote:

I think my biggest hurdle is going to be getting the proper Semi Rigid cables that are needed I
have no clue where to buy these........

There are two Chinese sellers on eBay who say they have the CA3102.
Another thought... the 2213A, 2215A, 2235, etc. all have three of those CA3102 chips on the mainboard.
Is there any chance of someone in your part of the world having a broken 22xx with some CA3102?
The part is not worth much, but the shipping to Thailand costs a lot.
tom jobe...



----- Original Message -----
From: tjeenz
To: TekScopes@...
Sent: Saturday, September 29, 2012 2:34 AM
Subject: [TekScopes] Re: 2213 no trigger



Hi David,

After waiting for one week for the ca3102, I found out it is not available here (thailand, bangkok area). I checked the internet but come out at companies who want to have minimum order of 150usd.
amazon lists them for 8 usd and shipping around 20 usd. maybe you know of a cheaper seller/location?

tjeenz.

--- In TekScopes@..., David <davidwhess@> wrote:
>
> On Mon, 24 Sep 2012 10:43:12 -0000, "tjeenz" <tjeenz@> wrote:
>
> >I removed u460. (ca3102 from rca). it is broken (20ohm between 1 and 14 in both directions)
> >also i found a diode connected on the top to pin 12. i couldn't detect pin 12 in the schematics... now start looking for a ca3102
>
> On Mon, 24 Sep 2012 08:50:17 -0000, "tjeenz" <tjeenz@> wrote:
>
> >> Voltage U460 pin3 and 9 is -8.6V, R456 is ok.
> >> pin 1 and 8 are 3.5V not 2.2
>
> That fits with pin 1 being 3.5 volts instead of 2.2 volts. The low
> resistance between the collector and base is pulling that node up via
> the high output of U480C.
>
> Pin 2 and pin 10 at about 0.0 volts while pin 3 is -8.6 volts suggests
> that the emitters of U460E and U460B is open as well.
>
> Pin 12 and pin 5 are connected internally to the substrate. The
> CA3102 is built on a junction isolated process so the substrate
> connects to each transistor via a diode which is reverse biased to
> provide isolation.
>
> >> u460 is unfortunately not on a socket.
>
> When replacing U460, I would cut the collet pins out of an IC socket
> and individually install them into the PC board to make a low profile
> socket for the new IC.
>
>
>
> >> To access u460 and area, i see i have to remove some components. I will start on that a.s.a.p. but a question: some loose contact in the timebase switch. sometimes it generates only half screen image when i move with that knob. is that the pot-meter in the middle?
>
> From what I remember of the 2213, the timebase switch uses a different
> and unreliable design from the other 22xx series oscilloscopes.
> Someone else may have suggestions for repairing it.
>

Azzy,

The basic method of making a tracking generator is to mix a frequency equal to the first IF with the first Local Oscillator to produce a signal equal in frequency to the analyzer input frequency. This is somewhat complicated in the 494P by the fact that the first IF frequency is somewhat variable (since the second local oscillator is sometimes swept). For the 0-1.8GHz band, the first IF is about 2.072 GHz. For most of the higher bands the first IF is 829MHz.

For a simple 2 to 3 GHz tracking generator you could use an external 829MHz source (approximate frequency), buffer amplifiers for the first LO output and a mixer. You would need to operate at sweep widths that did not sweep the second local oscillator.

Fancier tracking generators would include signal leveling and would include the second LO oscillator to allow proper operation with narrow sweeps: Take a look at what John Miles did for the 0-1.8GHz band:
<<>>

--John Gord



--- In TekScopes@..., "Asadullah" <mirasad31415@> wrote:

I have purchased a Tek 494P off Ebay yesterday. ( It is still in transit). What I must have is a tracking gen to go with her. I looked through the 494P manual but could not determine what it is. ( I am bit slow at understanding) Besides I might not be able to buy one even if I can find one.
So the big question. What will work as a substitute? Where could I find information on how to build one if possible? My current interest is in the 2 to 3 GHz range only, but might go to around 10 GHz.
Even a block diagram will help. I could jury rig something to work.
Any help is welcome. Thanks

Azzy.