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Re: Problems with MG Chemicals Super Contact Clearer

 

Hello Eric, Yes. That was the whole point in the second can. Neither worked. That
is why I then wrote MG Chemicals.

Stan.
Re: 7623A + 7A26 + 7B53

 

Well if it doesn't trigger, you will want a different 7B53A ...

David

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Fabio Trevisan
Sent: 27 February 2018 21:42
To: [email protected]
Subject: Re: [TekScopes] 7623A + 7A26 + 7B53

Thank you all guys, for the advice...

David... any particular reason why you specified "and the TB triggers OK"?
Re: 16700A setting up Xwindows.

 

Remember is a T&M that just happens to be running HPUX, there is NO
customization from HP. That's why unless you really know HPUX and Unix
stuff you will crash it all the time

On Tue, Feb 27, 2018 at 5:04 PM, Pete Lancashire <pete@...>
wrote:

If you crashed it hard, you get the CD from HP and do a full reload the
instructions are in the manual or online a few places.

On Tue, Feb 27, 2018 at 3:54 PM, Richard R. Pope <mechanic_2@...>
wrote:

Hello all,
Mine is a NEC 3x that uses a CD Carrier. Remember those!! 16700s do
not have Displays. This is from an expert that explained the terminology to
me. The As came with Ethernet 10baseTs and no CD-ROM drive. The Bs came
with 10/100baseT and internal CD-ROM drives. Mine is an Opt3 which means
that the Graphics have been upgraded.
Yes, I made it where I can no longer run the Analyzer. This has more
to do with the way the machine was heavily customized. So if someone could
please help me to take this back to day one and rebuild the OS from scratch
it would be really appreciated?
GOD Bless and Thanks,
rich!

On 2/27/2018 7:36 AM, Pete Lancashire wrote:

I had a lot of trouble finding a CD reader that would work with mine. I
think I ended up with either a Plextor or an IBM. The good news is that
SCSI CD readers are cheap these days.
Another one is Yamaha, can't remember the model, it is the one SUN
used.

I also added a larger/faster hard drive to mine. Gcc wouldn't fit on
the original :-)
I've been attempted to try a SCSI<->SCSI80 adapter and see what happens
with on of the many 15K RPM 72GB drives I have.

got rid of the session manager
There is a display-less version of the 16700's.


On Tue, Feb 27, 2018 at 5:29 AM, Paul Amaranth <paul@...>
wrote:

IIRC, they use fvwm as the window manager and it's relatively easy to
change the personality. At least once you find where they put the
configuration file.

It's an interesting box if you're familiar with Unix and/or HPUX. I've
hacked mine significantly, got rid of the session manager (which is a
real pig on that small machine) and use it remote. Pretty slick getting
a 24" DSO screen. (hint: ssh in, then run the bare app with the DISPLAY
variable set). Don't use vnc, that just gets you an image of the
LA desktop.

That's HPUX 10.2 and there are additional binaries you can load. For a
while the Merjin archive had dropped the 10.x binaries but they're back
online now. You can add bash and ssh as well as gcc, perl and a few
others.
Adding ssh makes it very easy to copy files in and out. On my network
that
was a mandatory add. If you're unfortunate enough to be using a windows
machine to access the LA remotely, use putty.

All that said, if you're not familiar with unix, just accept the UI they
give you and learn to work with it. For me, having a computer that runs
an LA app is more useful than an LA that happens to run on a computer.
But
I've been building Unix systems for 30 years and can pretty much make
them do whatever I want.

I had a lot of trouble finding a CD reader that would work with mine. I
think I ended up with either a Plextor or an IBM. The good news is that
SCSI CD readers are cheap these days.

I also added a larger/faster hard drive to mine. Gcc wouldn't fit on
the original :-)

Paul

On Tue, Feb 27, 2018 at 12:41:08AM -0800, Pete Lancashire wrote:

The 16700A is a piece of T&M that uses HPUX as its base control
software
and UI. Although it is a complete kernel the "devices" are not all
standard, any changes to what you see and get and you can tank the
whole
thing and have to start over from a CD mounted via a external SCSI CD
Drive, not only external but one that has to support Unix size disk
blocks

vs native CD block sizes. Back to devices
changes in the startup sequence can cause I/O modules to stop working
as
well.

Your prompt is pretty much common for a system without a host name, in
the

case the unknown is where the host-name would go

If you want to continue using it as a LA, I would strongly suggest not
changing the display and just get use to it.

On Tue, Feb 27, 2018 at 12:21 AM, Richard R. Pope <
mechanic_2@...>

wrote:

Hello all,
. . . . I have a benefactor that was nice enough to send me a 16700A
LA.
I don't like the Xwindows that is setup to look like Win95. UGH! Going
by
Dave Partridge's web site allows be to get into HPUX but from there it
all
comes a part for me. I am able to log into ISL without any problems and
then I can log into hpux using the -is command. I get a unknown:/>
prompt.
I am able to execute mkdir /cdrom with no problems. I don't know enough
about Unix to find the sys.x11start.gz file. When I explore one of the
CDROM images that I have on my win machine there is no such file. I
also
don't know how to access the cdrom drive that I have hooked up. it does
show up in the path as sescsi.0.0 so I know that the system sees it.
Unfortunately there is no sys.x11start.gz on the CDROM discs. I also
don't
know how to setup the network under UNIX.
GOD Bless and Thanks,
rich!





!DSPAM:5a95162e56281055547311!

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Re: 16700A setting up Xwindows.

 

If you crashed it hard, you get the CD from HP and do a full reload the
instructions are in the manual or online a few places.

On Tue, Feb 27, 2018 at 3:54 PM, Richard R. Pope <mechanic_2@...>
wrote:

Hello all,
Mine is a NEC 3x that uses a CD Carrier. Remember those!! 16700s do
not have Displays. This is from an expert that explained the terminology to
me. The As came with Ethernet 10baseTs and no CD-ROM drive. The Bs came
with 10/100baseT and internal CD-ROM drives. Mine is an Opt3 which means
that the Graphics have been upgraded.
Yes, I made it where I can no longer run the Analyzer. This has more
to do with the way the machine was heavily customized. So if someone could
please help me to take this back to day one and rebuild the OS from scratch
it would be really appreciated?
GOD Bless and Thanks,
rich!

On 2/27/2018 7:36 AM, Pete Lancashire wrote:

I had a lot of trouble finding a CD reader that would work with mine. I
think I ended up with either a Plextor or an IBM. The good news is that
SCSI CD readers are cheap these days.
Another one is Yamaha, can't remember the model, it is the one SUN
used.

I also added a larger/faster hard drive to mine. Gcc wouldn't fit on
the original :-)
I've been attempted to try a SCSI<->SCSI80 adapter and see what happens
with on of the many 15K RPM 72GB drives I have.

got rid of the session manager
There is a display-less version of the 16700's.


On Tue, Feb 27, 2018 at 5:29 AM, Paul Amaranth <paul@...>
wrote:

IIRC, they use fvwm as the window manager and it's relatively easy to
change the personality. At least once you find where they put the
configuration file.

It's an interesting box if you're familiar with Unix and/or HPUX. I've
hacked mine significantly, got rid of the session manager (which is a
real pig on that small machine) and use it remote. Pretty slick getting
a 24" DSO screen. (hint: ssh in, then run the bare app with the DISPLAY
variable set). Don't use vnc, that just gets you an image of the
LA desktop.

That's HPUX 10.2 and there are additional binaries you can load. For a
while the Merjin archive had dropped the 10.x binaries but they're back
online now. You can add bash and ssh as well as gcc, perl and a few
others.
Adding ssh makes it very easy to copy files in and out. On my network
that
was a mandatory add. If you're unfortunate enough to be using a windows
machine to access the LA remotely, use putty.

All that said, if you're not familiar with unix, just accept the UI they
give you and learn to work with it. For me, having a computer that runs
an LA app is more useful than an LA that happens to run on a computer.
But
I've been building Unix systems for 30 years and can pretty much make
them do whatever I want.

I had a lot of trouble finding a CD reader that would work with mine. I
think I ended up with either a Plextor or an IBM. The good news is that
SCSI CD readers are cheap these days.

I also added a larger/faster hard drive to mine. Gcc wouldn't fit on
the original :-)

Paul

On Tue, Feb 27, 2018 at 12:41:08AM -0800, Pete Lancashire wrote:

The 16700A is a piece of T&M that uses HPUX as its base control software
and UI. Although it is a complete kernel the "devices" are not all
standard, any changes to what you see and get and you can tank the whole
thing and have to start over from a CD mounted via a external SCSI CD
Drive, not only external but one that has to support Unix size disk
blocks

vs native CD block sizes. Back to devices
changes in the startup sequence can cause I/O modules to stop working as
well.

Your prompt is pretty much common for a system without a host name, in
the

case the unknown is where the host-name would go

If you want to continue using it as a LA, I would strongly suggest not
changing the display and just get use to it.

On Tue, Feb 27, 2018 at 12:21 AM, Richard R. Pope <
mechanic_2@...>

wrote:

Hello all,
. . . . I have a benefactor that was nice enough to send me a 16700A
LA.
I don't like the Xwindows that is setup to look like Win95. UGH! Going
by
Dave Partridge's web site allows be to get into HPUX but from there it
all
comes a part for me. I am able to log into ISL without any problems and
then I can log into hpux using the -is command. I get a unknown:/>
prompt.
I am able to execute mkdir /cdrom with no problems. I don't know enough
about Unix to find the sys.x11start.gz file. When I explore one of the
CDROM images that I have on my win machine there is no such file. I
also
don't know how to access the cdrom drive that I have hooked up. it does
show up in the path as sescsi.0.0 so I know that the system sees it.
Unfortunately there is no sys.x11start.gz on the CDROM discs. I also
don't
know how to setup the network under UNIX.
GOD Bless and Thanks,
rich!





!DSPAM:5a95162e56281055547311!

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Re: 16700A setting up Xwindows.

 

Get a SCSI2SD converter card instead. Worked great for me in my 16702. This uses
SD cards as the storage device so you are not locked into (very) old rotating media.

One great thing about using a SD card is that you can write any image to it it and you
do not have to install the system from a CD or even need a CDROM drive. Since you
can keep the image as a backup you can fool around with all the settings and if you
really mess things up you can just restore the original image. Quick and easy!

Pete.
Re: What can you do with a 1502?

[email protected]
 

Hi. Several years ago, I, (for some bizarre reason) became rather obsessed with TDRs. I have 3 towers at my location with antennas from 160M through 70CM. I was able to accumulate a LOT of 1502 and 1503 TDRs, in addition to a bunch of Biddle, etc.

When I install a new antenna, I always make several runs with the HP TDR and it's printout.
I then store it and go back every year or so, to see if things have changed.

Yes, the batteries are NFG and the TD are problematic. However, through ePay, I have scored a bunch of NOS TDs from both HP and the Russian equivalent.

ron
N4UE

-----Original Message-----
From: Tom Gardner <tggzzz@...>
To: TekScopes <[email protected]>
Sent: Tue, Feb 27, 2018 6:59 pm
Subject: Re: [TekScopes] What can you do with a 1502?

On 27/02/18 21:57, Paul Amaranth wrote:
I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?
Not just breaks, any discontinuity. I've used it to diagnose a fault in a
relative's 75ohm TV antenna feed, where one multiplex couldn't be received.
There was a bad kink 4m into the cable, and the impedance change notch filtered
the multiplex's frequency.

Given the resolution, it can also be used to diagnose impedance variations on a
PCB; that's obviously not possible with the 1502B or 1502C.

Occasionally, since it my fastest scope by about decade, I'm tempted use it to
measure the risetime of my step generator. Obviously extreme care would be
needed to avoid damaging the TD, but I think it could be done.

And, shades of Dennis Tillman, vendors at hamfests are beginning to remember me :)

The 1502s are sweet little things.
Re: Problems with MG Chemicals Super Contact Clearer

 

Out of curiosity, did you try BOTH ends of the nozzle?
--Eric
Sent from my Samsung Galaxy S8.

-------- Original message --------From: Phillip Potter <p.potter@...> Date: 2/27/18 6:02 PM (GMT-06:00) To: [email protected] Subject: Re: [TekScopes] Problems with MG Chemicals Super Contact Clearer
Hi Stan,

I use MG Chemical Super Wash, part number 406B-425G.

I just removed and inserted the current tube a loose tube (spare, taped
to the can) in my can's nozzle... works like a charm.

It IS a different product number, so "apples and oranges?"? I don't
know.? I suspect a bad bowl of chili from the tube or nozzle supplier to
NGC.

Phil


On 2/27/2018 12:53 PM, brasscat wrote:
Am I the only one having this problem
Re: Problems with MG Chemicals Super Contact Clearer

Phillip Potter
 

Hi Stan,

I use MG Chemical Super Wash, part number 406B-425G.

I just removed and inserted the current tube a loose tube (spare, taped to the can) in my can's nozzle... works like a charm.

It IS a different product number, so "apples and oranges?"? I don't know.? I suspect a bad bowl of chili from the tube or nozzle supplier to NGC.

Phil

On 2/27/2018 12:53 PM, brasscat wrote:
Am I the only one having this problem
Re: What can you do with a 1502?

 

On 27/02/18 21:57, Paul Amaranth wrote:
I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?
Not just breaks, any discontinuity. I've used it to diagnose a fault in a relative's 75ohm TV antenna feed, where one multiplex couldn't be received. There was a bad kink 4m into the cable, and the impedance change notch filtered the multiplex's frequency.

Given the resolution, it can also be used to diagnose impedance variations on a PCB; that's obviously not possible with the 1502B or 1502C.

Occasionally, since it my fastest scope by about decade, I'm tempted use it to measure the risetime of my step generator. Obviously extreme care would be needed to avoid damaging the TD, but I think it could be done.

And, shades of Dennis Tillman, vendors at hamfests are beginning to remember me :)

The 1502s are sweet little things.
Re: 16700A setting up Xwindows.

 

Hello all,
Mine is a NEC 3x that uses a CD Carrier. Remember those!! 16700s do not have Displays. This is from an expert that explained the terminology to me. The As came with Ethernet 10baseTs and no CD-ROM drive. The Bs came with 10/100baseT and internal CD-ROM drives. Mine is an Opt3 which means that the Graphics have been upgraded.
Yes, I made it where I can no longer run the Analyzer. This has more to do with the way the machine was heavily customized. So if someone could please help me to take this back to day one and rebuild the OS from scratch it would be really appreciated?
GOD Bless and Thanks,
rich!

On 2/27/2018 7:36 AM, Pete Lancashire wrote:
I had a lot of trouble finding a CD reader that would work with mine. I
think I ended up with either a Plextor or an IBM. The good news is that
SCSI CD readers are cheap these days.
Another one is Yamaha, can't remember the model, it is the one SUN
used.

I also added a larger/faster hard drive to mine. Gcc wouldn't fit on
the original :-)
I've been attempted to try a SCSI<->SCSI80 adapter and see what happens
with on of the many 15K RPM 72GB drives I have.

got rid of the session manager
There is a display-less version of the 16700's.


On Tue, Feb 27, 2018 at 5:29 AM, Paul Amaranth <paul@...> wrote:

IIRC, they use fvwm as the window manager and it's relatively easy to
change the personality. At least once you find where they put the
configuration file.

It's an interesting box if you're familiar with Unix and/or HPUX. I've
hacked mine significantly, got rid of the session manager (which is a
real pig on that small machine) and use it remote. Pretty slick getting
a 24" DSO screen. (hint: ssh in, then run the bare app with the DISPLAY
variable set). Don't use vnc, that just gets you an image of the
LA desktop.

That's HPUX 10.2 and there are additional binaries you can load. For a
while the Merjin archive had dropped the 10.x binaries but they're back
online now. You can add bash and ssh as well as gcc, perl and a few
others.
Adding ssh makes it very easy to copy files in and out. On my network that
was a mandatory add. If you're unfortunate enough to be using a windows
machine to access the LA remotely, use putty.

All that said, if you're not familiar with unix, just accept the UI they
give you and learn to work with it. For me, having a computer that runs
an LA app is more useful than an LA that happens to run on a computer. But
I've been building Unix systems for 30 years and can pretty much make
them do whatever I want.

I had a lot of trouble finding a CD reader that would work with mine. I
think I ended up with either a Plextor or an IBM. The good news is that
SCSI CD readers are cheap these days.

I also added a larger/faster hard drive to mine. Gcc wouldn't fit on
the original :-)

Paul

On Tue, Feb 27, 2018 at 12:41:08AM -0800, Pete Lancashire wrote:
The 16700A is a piece of T&M that uses HPUX as its base control software
and UI. Although it is a complete kernel the "devices" are not all
standard, any changes to what you see and get and you can tank the whole
thing and have to start over from a CD mounted via a external SCSI CD
Drive, not only external but one that has to support Unix size disk
blocks
vs native CD block sizes. Back to devices
changes in the startup sequence can cause I/O modules to stop working as
well.

Your prompt is pretty much common for a system without a host name, in
the
case the unknown is where the host-name would go

If you want to continue using it as a LA, I would strongly suggest not
changing the display and just get use to it.

On Tue, Feb 27, 2018 at 12:21 AM, Richard R. Pope <
mechanic_2@...>
wrote:

Hello all,
. . . . I have a benefactor that was nice enough to send me a 16700A
LA.
I don't like the Xwindows that is setup to look like Win95. UGH! Going
by
Dave Partridge's web site allows be to get into HPUX but from there it
all
comes a part for me. I am able to log into ISL without any problems and
then I can log into hpux using the -is command. I get a unknown:/>
prompt.
I am able to execute mkdir /cdrom with no problems. I don't know enough
about Unix to find the sys.x11start.gz file. When I explore one of the
CDROM images that I have on my win machine there is no such file. I
also
don't know how to access the cdrom drive that I have hooked up. it does
show up in the path as sescsi.0.0 so I know that the system sees it.
Unfortunately there is no sys.x11start.gz on the CDROM discs. I also
don't
know how to setup the network under UNIX.
GOD Bless and Thanks,
rich!





!DSPAM:5a95162e56281055547311!
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Re: Where to find a serial number on a 335 Sony/Tektronix

Phillip Potter
 

Then it fell off... there is a slot, but no SN plate.

You can see that, here:

/g/TekScopes/album?id=33014


so, I guess the search is over.? Come to think of it, I have a vague recollection of the SN tag there, on my previous 335.

Thanks, Paul!

Phil

On 2/27/2018 3:08 PM, Paul Amaranth wrote:
Should be under the external trigger input BNC on the side.
Re: Where to find a serial number on a 335 Sony/Tektronix

 

Should be under the external trigger input BNC on the side.
Paul

On Tue, Feb 27, 2018 at 02:54:41PM -0800, Phillip Potter wrote:
Hi all,

I searched to exterior, and the interior, but could not find a SN for my
335.

The reason for the search is, I have two 335 manuals a want to figure
out which one to keep.? One has part number 070-1943-*00 *and the other
is 070-1943-01. I figured that I would need the SN to tell which manual
is more appropriate.

I did see that there was a date of 1973 on the etching on a board
inside, so that gets me closer.? BUT, still no joy!

Thanks,

Phil





!DSPAM:5a95de30122821789668007!
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Re: What can you do with a 1502?

 

Thanks Harvey, I'm aware of the TD issue. Frankly, I was surprised that
it was OK.

There was a thread on eevblog where one fellow used a Russion 1|308E as
the 20mA and a A|201V for the 10mA diode. Sorry, I can't get the Cyrilic
in correctly. I have a pack of the A|201V, I think. You can get 4 of those
for $9, maybe less, on ebay (search for au201v). Haven't found the 1|308Es yet.

Here's the eevblog thread:


That was 4 years ago. Some other ones might work.

Thanks for the pointer Dennis, I'll track down a copy.

Paul

On Tue, Feb 27, 2018 at 05:41:09PM -0500, Harvey White wrote:
On Tue, 27 Feb 2018 16:57:17 -0500, you wrote:

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

You are quite lucky. The tunnel diode is very fragile and directly
connected to the BNC. (I'm thinking of the 1502, not sure about the
later revisions). There should be a shorting BNC connector that needs
to be on at all times unless you're doing a measurement.

The tunnel diode can be damaged by DC (a typical damage scenario) or
by RF transmitted into the TDR.

The 1503 is harder to damage, doesn't use a tunnel diode, has a
different presentation on the screen, but is for cables about 10x
longer.



Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?
Determining the velocity factor of the cable, for one. I think you
can also determine the impedance of a cable as well.

Again, be really careful with this, simply because the tunnel diode is
unobtainable (period, sincerely yours, etc....). There *may* be a
Russian equivalent, but I've not heard of one offhand.

Mine needed battery packs, too.

Harvey






!DSPAM:5a95db0b121691461739471!
--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Where to find a serial number on a 335 Sony/Tektronix

Phillip Potter
 

Hi all,

I searched to exterior, and the interior, but could not find a SN for my 335.

The reason for the search is, I have two 335 manuals a want to figure out which one to keep.? One has part number 070-1943-*00 *and the other is 070-1943-01. I figured that I would need the SN to tell which manual is more appropriate.

I did see that there was a date of 1973 on the etching on a board inside, so that gets me closer.? BUT, still no joy!

Thanks,

Phil
Re: What can you do with a 1502?

 

On Tue, 27 Feb 2018 16:57:17 -0500, you wrote:

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

You are quite lucky. The tunnel diode is very fragile and directly
connected to the BNC. (I'm thinking of the 1502, not sure about the
later revisions). There should be a shorting BNC connector that needs
to be on at all times unless you're doing a measurement.

The tunnel diode can be damaged by DC (a typical damage scenario) or
by RF transmitted into the TDR.

The 1503 is harder to damage, doesn't use a tunnel diode, has a
different presentation on the screen, but is for cables about 10x
longer.



Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?
Determining the velocity factor of the cable, for one. I think you
can also determine the impedance of a cable as well.

Again, be really careful with this, simply because the tunnel diode is
unobtainable (period, sincerely yours, etc....). There *may* be a
Russian equivalent, but I've not heard of one offhand.

Mine needed battery packs, too.

Harvey
Re: What can you do with a 1502?

 

Hi Paul,
It has lots of uses. Get the Tek book Time Domain Reflectrometry
Measurements for insights.

I use it to test every cable, connector, and adapter I buy from ham fests
the Chinese, and anyone else. It doesn't go into my drawer until I confirmed
it is stable, the connections are sound, and the impediance is 50 Ohms (or
not more than 53 ohms if you are dealing with RG-53.

Dennis Tillman W7PF

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Paul
Amaranth
Sent: Tuesday, February 27, 2018 1:57 PM
To: [email protected]
Subject: [TekScopes] What can you do with a 1502?

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a battery
pack and then fix the charging circuitry, but otherwise it was fine.

Turned out I had an immediate need for it to measure how much coax I had
left on a roll (answer: exactly enough to do a job). Pretty handy getting
an answer without having to string the cable or unrolling the entire reel
and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the obvious
ones of finding cable breaks and identifying where connectors are?

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows




--
Dennis Tillman W7PF
TekScopes Moderator
Re: Problems with MG Chemicals Super Contact Clearer

 

Hi Stan,
I had the same problem just yesterday on a new MG Chemicals Super Contact Cleaner I bought.
On my own I figured that I would have more success by removing the nozzle.
That was the case, but it was not enough.
Next I grabbed the spray tube with a pair of pliers close to the end that I wanted in the nozzle.
Eventually I started twisting as I was applying downward pressure on the spray tube.
The nozzle was on the desk so it couldn't move. That made it easy to hold under the pressure from the Spray tube.
It did go in after a struggle. The nice thing about this after I got it inserted is "that sucker ain't never coming out". It was satisfying when I thought about how many spray tubes have fallen out of their nozzles and I realized that MG Chemicals came up with a solution at last.

MG Chemicals I have some advice for you: Beware of unintended consequences.

Perhaps if you created a short YouTube video showing how it's done your customer's would appreciate it more.

STAN: If you send me your nozzle and spray tube I think I can put them together for you. Contact me off list for my address.

Dennis Tillman W7PF
PS I have no relationship with MG Chemicals

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of brasscat
Sent: Tuesday, February 27, 2018 12:53 PM
To: [email protected]
Subject: [TekScopes] Problems with MG Chemicals Super Contact Clearer

Hello the forum,

Relevance to Forum, it is used in cleaning switches in Tektronix equipment.

I bought a can of this product, 801B-125G. The spray tube just will not insert. Like many of you, I have inserted these spray tubes over the years.
I contacted the dealer, they take no responsibility, said contact MG Chemical.
So I did.

--- EMAIL ----------------------------------------------------------------------------------------------------
Hello Mg Chemicals,

I have now purchased a second spray can of your SUPER CONTACT CLEANER 801B-125G.
I bought the second can from a different seller, intending to return the first can!!
The red spray tube DOES NOT FIT INTO THE NOZZLE!! This second can has the SAME PROBLEM!

I am in my 60's and worked as electronic / microcomputer engineer 3 decades. I have used may sprays, and inserted many spray tubes. Yes, it needs to be a snug fit. But these red spray tubes are not inserting, if I use any more force it would damage the tube. I see no instructions showing some SPECIAL method to insert the tube.

Since these two cans came from different suppliers, this problem is a bigger problem.

Please help.
--- FORUM -----------------------------------------------------------------------------------------

Well, they responded
--- RESPONSE ------------------------------------------------------------------------------------
Hello Stan,

I do apologize for inconvenience this has caused. The easy way to do fit it in is to take the nozzle out first. Secondly, hold the nozzle upright with one hand and the other hand with tube. Make sure to angle the tube about 45 degrees downwards as you adjust the fit. Apply gentle force and it should fit in without any issue. I just tried few cans and it worked. Do not hesitate if you have any questions.


Regards,

Titus Cheruiyot, B.S.E.E,M.ENG

-- ME TO FORUM --------------------------------------------------------------------------------

It did not work. I have sent another email

-- EMAIL AGAIN -----------------------------------------------------------------------------------

Hello Titus Cheruiyot, thanks for your reply.

Never having had to used this procedure, I gave it a try, I take it that to "hold the nozzle upright" to mean to align the receiving cylindrical opening so its center line (axis) is vertically aligned. an inserted spray tube would stand upright.
Then position the spray tube with its axis at a 45 deg to the nozzle axis, and insert. A gentle force!

IT DOES NOT INSERT. IT WILL NOT GO IN.

I decided to "scrapped" it's end a bit, if I screw up I can just cut with exacto knife 1/2" with little loss of tube length. I did not "cut" or "shave" off material. I "scrapped" off a tiny amour all the way around the circumference. Using the blade in a negative rake (lathe term). It is "dragging"
the blade instead of pushing the blade into the material. This removes a very thin amount.

Now I inserted it with difficulty, not sure how well it will stay inserted. Perhaps I should glue it?

This makes me think something is wrong here.

1> Was there a production lot of defective spray tubes or nozzles?
2> Are there counterfeits of this product?

I sure would like a nozzle and spray tube that are working correctly. This spray cleaner is highly respected, and it costs a fair amount also!

I am going to post this questions on a couple of electronic / test equipment forums.

Sincerely, Stan Krumme

-- TO FORUM --------------------------------------------------------------------------------------------

So, Am I the only one having this problem, anyone else have this problem??

Thanks, Stan



--
Dennis Tillman W7PF
TekScopes Moderator
What can you do with a 1502?

 

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Re: 7623A + 7A26 + 7B53

 

Thank you all guys, for the advice...

David... any particular reason why you specified "and the TB triggers OK"?

I mean... the video that the owner posted...(here:
)
indeed doesn't show it triggering... but I`m just assuming he doesn't know
how to do it.

I hope I didn't assume too much... I already bought it.

What does the 7B53A uses for triggering? Tunnel Diodes?

Rgrds,

Fabio

2018-02-27 18:15 GMT-03:00 David C. Partridge <david.partridge@...

:
If it powers on and works and the TB triggers OK, than just buy it.

Dave

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Fabio
Trevisan
Sent: 27 February 2018 18:27
To: [email protected]
Subject: [TekScopes] 7623A + 7A26 + 7B53

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you
experts, if there is any known quirks or component that fails or break
often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio
Re: 7623A + 7A26 + 7B53

 

If it powers on and works and the TB triggers OK, than just buy it.

Dave

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Fabio Trevisan
Sent: 27 February 2018 18:27
To: [email protected]
Subject: [TekScopes] 7623A + 7A26 + 7B53

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you experts, if there is any known quirks or component that fails or break often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio
63721 - 63740 of 208764