Date   

Re: Tek 4041 GPIB Controller

Dave Brown
 

Ditto- my 4041 has been languishing in the corner for some years now.
DaveB, NZ

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Gary Robert Bosworth
Sent: Monday, May 25, 2020 14:07
To: TekScopes@groups io
Subject: Re: [TekScopes] Tek 4041 GPIB Controller

Please let me know if you ever manage to copy the tape for the 4041. My tape has become flaky over the past 40 years. I would be willing to pay for a working copy of the tape.

Gary Bosworth


On Sun, May 24, 2020 at 4:14 PM Monty McGraw <mmcgraw74@...> wrote:

Dave,

I just got one of my Tektronix 4041 computers working this morning.

I have a System Verification tape - that boots, but has a program
error trying to load the terminal console program.

I've got my 4041 connected to my laptop with the COM0 RS-232. I'll
see if I can get the System tape copied.

Monty

Photos of my 4041 on my thread on
vcfed.org:
http://www.vcfed.org/forum/showthread.php?75275-Tektronix-4041-compute
r-from-the-early-1980-s-WORKING!!&p=622704#post622704



--
Gary Robert Bosworth
@grbosworth
Tel: 310-317-2247


Re: Tek power cables, older equipment

Daveolla
 

At 06:49 PM 5/24/2020, you wrote:
Hi Raymond,
To paraphrase Douglas Adams (author of The Hitchhikers Guide to the Galaxy)
"If you want to survive out here, you've got to know where TekWiki is at all times".
It has the answer to everything Tek made that you want to know more about.
http://w140.com/tekwiki/wiki/Main_Page

Dennis Tillman W7pF

Say what?????? I thought that was TEKSCOPES .............it even had the answer to check out TekWiki!!!!

And your the moderator! :)


Re: Tek power cables, older equipment

Raymond Cote
 

Yrs Dennis. I browsed it and it is amazingly thorough. Good reference. Thanks a bunch

In matters of style, float with the current. In matters of Principle, stand like a rock. “. — Thomas Jefferson —

On May 24, 2020, at 18:49, Dennis Tillman W7pF <@Dennis_Tillman_W7pF> wrote:

Hi Raymond,
To paraphrase Douglas Adams (author of The Hitchhikers Guide to the Galaxy)
"If you want to survive out here, you've got to know where TekWiki is at all times".
It has the answer to everything Tek made that you want to know more about.
http://w140.com/tekwiki/wiki/Main_Page

Dennis Tillman W7pF


-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Raymond Cote
Sent: Sunday, May 24, 2020 4:31 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek power cables, older equipment

Oh, ok Dennis. I remember those. Also what us Tek wiki?

--
Dennis Tillman W7pF
TekScopes Moderator




--
Dennis Tillman W7pF
TekScopes Moderator



Re: Tek 4041 GPIB Controller

Gary Robert Bosworth
 

Please let me know if you ever manage to copy the tape for the 4041. My
tape has become flaky over the past 40 years. I would be willing to pay for
a working copy of the tape.

Gary Bosworth

On Sun, May 24, 2020 at 4:14 PM Monty McGraw <mmcgraw74@...> wrote:

Dave,

I just got one of my Tektronix 4041 computers working this morning.

I have a System Verification tape - that boots, but has a program error
trying to load the terminal console program.

I've got my 4041 connected to my laptop with the COM0 RS-232. I'll see if
I can get the System tape copied.

Monty

Photos of my 4041 on my thread on
vcfed.org:
http://www.vcfed.org/forum/showthread.php?75275-Tektronix-4041-computer-from-the-early-1980-s-WORKING!!&p=622704#post622704



--
Gary Robert Bosworth
@grbosworth
Tel: 310-317-2247


Frequency Counter for Tracking Generator

 

After acquiring a TR-503 tracking generator for my 492 spectrum analyzer, I was on the lookout for a DC508A counter with the proper option as an add-on. But in time I realized I have several counters that can be connected to the TR-503's auxiliary output to accurately display frequency, so I dropped the idea. But the other day I saw an ad for this $18.95, eight-digit 2.4 GHz counter found at https://www.mpja.com/Test-Equipment/products/59/ that looked like it might serve as the basis of a dedicated counter if a suitable crystal time-base could be added. Looking on the usual auction site, it appeared these counters are available there for even less.

It was kind of alarming to read that a VCO is being used as a time-base. Also, they mentioned a divide-by-64 function being used for higher frequencies; so it is not clear whether, in that range, the counter displays actual frequency or that divided by 64. Anyway, I thought this might possibly be of interest to others for incorporation in projects. Has anyone investigated these?

I have no connection with the seller, other than having bought parts from them.

Bruce, KG6OJI


Re: Tek 4041 GPIB Controller

 

Hpseries80@groups.io, hp9845.net and other places have lots of info about these drives and tapes. The tapes tend to physically lose their coating and the polyurethane drive capstans crumble or become chewing gum. I think you're lucky that things work at all!
Repairs and mods for these drives are described in said places. You've probably got the plastibands suggestion from one of them.

Raymond


Re: Tek 4041 GPIB Controller

 

Hi Monty,
There might be a few causes for this. The tape heads should be cleaned since that's the easiest thing to try. I am not familiar if demagnetizing them is also appropriate on occasion. The tape drive was probably bought from a manufacturer. If you can find the model number you may be able to locate a service manual for it that has information about routine cleaning and servicing.

The rubber capstan wheels are probably dried out causing the tape speed to wander. I think there are coatings that can be applied that make them more supple but it has been a while since I did anything like this.

Your tape may have bit rot. Nothing is permanent and bits can change when the magnetic media changes. This would vary due to how the tape was stored. You may be able to buy a replacement tape from the vintageTEK Museum.

I think there may be more members with 4041s on TekScopes. One of them might have a tape you can use.

Good luck, It sounds like you're having fun. When you get it working post some pictures in our photos section.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Monty McGraw
Sent: Sunday, May 24, 2020 2:11 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek 4041 GPIB Controller

Dave,

I just got one of my Tektronix 4041 computers working this morning.

I have a System Verification tape - that boots, but has a program error trying to load the terminal console program.

I've got my 4041 connected to my laptop with the COM0 RS-232. I'll see if I can get the System tape copied.

Monty

Photos of my 4041 on my thread on
vcfed.org: http://www.vcfed.org/forum/showthread.php?75275-Tektronix-4041-computer-from-the-early-1980-s-WORKING!!&p=622704#post622704





--
Dennis Tillman W7pF
TekScopes Moderator


Re: Spectrum Analyzer

fiftythreebuick
 

Hi James-

I've had a 1401A for a long time and like it. Small, portable, battery option and while it mates up just right with a 323/etc, you can use it with any scope that has good X-Y capability. I've got a junker 32X scope or two and one of these days I'm gonna convert one of the power supply modules for operation without batteries so I can keep the 1401A on the bench without having to babysit the doggone nicads. That's been a mighty convenient option on my 1502 and 1503....

Tom AE5I


Re: Tek power cables, older equipment

 

Hi Raymond,
To paraphrase Douglas Adams (author of The Hitchhikers Guide to the Galaxy)
"If you want to survive out here, you've got to know where TekWiki is at all times".
It has the answer to everything Tek made that you want to know more about.
http://w140.com/tekwiki/wiki/Main_Page

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Raymond Cote
Sent: Sunday, May 24, 2020 4:31 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek power cables, older equipment

Oh, ok Dennis. I remember those. Also what us Tek wiki?

--
Dennis Tillman W7pF
TekScopes Moderator




--
Dennis Tillman W7pF
TekScopes Moderator


Re: Tek power cables, older equipment

 

Hi Leon,
This sounds like a much more expensive and more time consuming solution than buying an Air Conditioner extension cord.
You should try the simple solution the next time. I think you find it is so simple you will use it every time from now on.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Leon Robinson
Sent: Saturday, May 23, 2020 8:09 PM
To: tekscopes@groups.io
Subject: Re: [TekScopes] Tek power cables, older equipment

I just go to Walmart and buy a 25 foot 3 prong cord, cutoff 5 or 6 feet or what ever I need at the female end put on a male plug and a female connector on the other piece of the cord and have another extension cord.Trim the nud off and sometimes a little bit on the corners of the female connector.


Leon Robinson K5JLR

Political Correctness is a Political Disease.

Politicians and Diapers should be changed often and for the same reasons.

On Saturday, May 23, 2020, 5:00:09 PM CDT, Dennis Tillman W7pF <@Dennis_Tillman_W7pF> wrote:

Hi Sean,
David Holland beat me to the punch. The air conditioner extension cords sold by Lowes are a perfect solution once you shave off the little nubbin on the female end next to where the D-shaped earth connector is. They come in many different lengths, they are inexpensive, and you can buy them in almost any hardware store beside Lowes.

I wish everything was this easy to replace on Tek equipment.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of David Holland
Sent: Saturday, May 23, 2020 10:14 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek power cables, older equipment

https://www.lowes.com/pd/PRIME-6-ft-3-Prong-Gray-Air-Conditioner-Appliance-Power-Cord/1002462146


Something like that works on my 184 & 106....

May have to trim off the little nubbin on the female end, but it works well enough...

David


On Sat, May 23, 2020 at 1:07 PM <sdturne@q.com> wrote:

For instruments like the 114 pulse generator, 184 time mark generator,
and more. Does anyone know of a good place to either get these power
cables? I have one, that came with my Type 114. With a 184 on the way,
I'd like to find another.

Thanks!

Sean




--
Dennis Tillman W7pF
TekScopes Moderator







--
Dennis Tillman W7pF
TekScopes Moderator


Re: Tek 4041 GPIB Controller

Monty McGraw
 

Dave,

I just got one of my Tektronix 4041 computers working this morning.

I have a System Verification tape - that boots, but has a program error trying to load the terminal console program.

I've got my 4041 connected to my laptop with the COM0 RS-232. I'll see if I can get the System tape copied.

Monty

Photos of my 4041 on my thread on
vcfed.org: http://www.vcfed.org/forum/showthread.php?75275-Tektronix-4041-computer-from-the-early-1980-s-WORKING!!&p=622704#post622704


Re: Spectrum Analyzer

WastelandTek
 

Rolling your own is a feasible, and very rewarding exercise.

https://www.qsl.net/n9zia/wireless/pdf/9808035.pdf

https://www.qsl.net/n9zia/wireless/pdf/9809037.pdf

WA7MLH's modifications to this classic project push it well past 700MHz


Re: Spectrum Analyzer

Jeff Woolsey
 

On 5/24/20 12:06 PM, Roy Thistle wrote:
On Sun, May 24, 2020 at 02:52 AM, James Theonas wrote:

Tektronix 1401A
Hi All: Hi James:
I've never seen a 1401 1401/A... but, it was supposed to be used with one of the 32x series scopes... both on batteries. I assuming (correct me please!) that it is now a collector's item... and so pricey!

They're a lot less pricey if you buy them at a flea market and they
don't work.  Of course, that's not going to happen a second time, at
least not to me.   Mine has a problem in the regulator, and in fact was
apparently hastily reassembled for sale, with a loose transistor, before
I bought it.  It's been in the shelved-awaiting-repair pile for a couple
years now.  I, too, was inspired by the w2aew video.  A dead 323 scope
came with mine (but with none of the hardware to tote them as a unit),
but I did manage to repair it (modulo having to bypass the
horizontal-var pot which has an open wiper).


--
Jeff Woolsey {{woolsey,jlw}@jlw,first.last@{gmail,jlw}}.com
Nature abhors straight antennas, clean lenses, and empty storage.
"Delete! Delete! OK!" -Dr. Bronner on disk space management
Card-sorting, Joel. -Crow on solitaire


Re: Spectrum Analyzer

Jim Ford
 

I second Sean.   My rule of thumb is "Tek for time domain and HP for frequency domain."  Best of both worlds!  I don't care for Tek spectrum analyzers or HP scopes (although I do own one of the latter - it was free to me).Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: sdturne@q.com Date: 5/24/20 2:01 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Spectrum Analyzer Speaking as someone who is not the biggest fan of Tektronix SAs despite having a serious addiction to Tek CROs, you could consider going the boat anchor route and get something like an HP 8568B. Yes, it's big and heavy (112 lbs considering both parts!), but it has a lot to like if you have the space for one. AC and DC coupled inputs (AC coupled input can tolerate 50 volts DC, which a lot of spectrum analyzers will not do), probe power /preamp power on the front panel, 1.5 GHz bandpass, very good phase noise performance (actually better than the 8566B). It's a pretty nice tool for lower frequency work. And you can leverage HP-IB (GPIB) and GPIB to USB adapter with a computer to do additional analysis that's beyond what's available on the front panel. Matlab's instrument control toolbox "just works"; it's how I typically interact with my HP spectrum analyzers now. From a usability standpoint, the 8566/68 series of SAs are pretty much the perfect marriage of emerging digital technology and analog technology IMO. No functionality that ought to be on the front panel is buried in context menus, it's all a button (or a shifted button) on the front panel. They also are still part of the era when service manuals were still mostly worth the paper they are printed on. Just something to consider. Sean


Re: Spectrum Analyzer

@0culus
 

Speaking as someone who is not the biggest fan of Tektronix SAs despite having a serious addiction to Tek CROs, you could consider going the boat anchor route and get something like an HP 8568B. Yes, it's big and heavy (112 lbs considering both parts!), but it has a lot to like if you have the space for one. AC and DC coupled inputs (AC coupled input can tolerate 50 volts DC, which a lot of spectrum analyzers will not do), probe power /preamp power on the front panel, 1.5 GHz bandpass, very good phase noise performance (actually better than the 8566B). It's a pretty nice tool for lower frequency work. And you can leverage HP-IB (GPIB) and GPIB to USB adapter with a computer to do additional analysis that's beyond what's available on the front panel. Matlab's instrument control toolbox "just works"; it's how I typically interact with my HP spectrum analyzers now.

From a usability standpoint, the 8566/68 series of SAs are pretty much the perfect marriage of emerging digital technology and analog technology IMO. No functionality that ought to be on the front panel is buried in context menus, it's all a button (or a shifted button) on the front panel. They also are still part of the era when service manuals were still mostly worth the paper they are printed on.

Just something to consider.

Sean


Belden Pressure Fit BNC

wallydoc
 

Does anyone have any experience with this BNC? Pressure fit connectors are normal for 75 ohm, this is for 50 ohm

https://catalog.belden.com//prodimgs/AllAssets-approved/EN/87/63/198763.pdf
Please note that the specs make use of a RG 223 iffy. The diameters of 223 are slightly larger than the specs of the connector.
Connector specs: https://catalog.belden.com/techdata/EN/DB58BNC_techdata.pdf
center pin: .0317-.0339
OD: .185-.201

Belden 223 specs: https://catalog.belden.com/techdata/EN/9273_techdata.pdf
center pin: .034
OD: .212

Belden RG 58 does fit the specs, but I would like to use something better, I normally use RG 223.

Any suggestions?
Wally KC9INK


Re: Spectrum Analyzer

John Gord
 

James,

What frequency range would you like to cover?
Hameg made the model HM8028 which goes to 500 MHz and needs a (large) power supply frame and an external x-y display. It is fairly rare, having been soon replaced by the HM5005, HM5006, etc. which all had integrated displays.

--John Gord

On Sun, May 24, 2020 at 02:52 AM, James Theonas wrote:


I have a 2465b Oscilloscope and I am looking for an external spectrum analyzer
I can use in conjunction with my oscilloscope. Something like the Tektronix
1401A but maybe a little more modern.
Again Thanks for all your help!
Dimitris Theonas


Re: Spectrum Analyzer

James Theonas
 

I was watching this video and it intrigued me. In said video a 1401a was used but I am interested in any device capable of doing what I saw in this video. Below is the youtube link.

#22: Spectrum Analyzer Basics / Tutorial, and the Tektronix 1401A

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#22: Spectrum Analyzer Basics / Tutorial, and the Tektronix 1401A

I picked up a Tek 1401A Spectrum Analyzer at a hamfest recently, and it inspired me to do a video or two. This o...
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Dimitris.

On Sunday, May 24, 2020, 10:06:39 PM GMT+3, Roy Thistle <roy.thistle@...> wrote:

On Sun, May 24, 2020 at 02:52 AM, James Theonas wrote:


Tektronix 1401A
Hi All: Hi James:
I've never seen a 1401 1401/A... but, it was supposed to be used with one of the 32x series scopes... both on batteries. I assuming (correct me please!) that it is now a collector's item... and so pricey!
Hi James:
Is there something about a 2465B that I am missing that would make it (I'm assuming) a good x,y display for something like a 1401? (32X series just dosn't compare to 24xx... except for porability.)
Best regards and wishes all.
Roy


Re: Spectrum Analyzer

Roy Thistle
 

On Sun, May 24, 2020 at 02:52 AM, James Theonas wrote:


Tektronix 1401A
Hi All: Hi James:
I've never seen a 1401 1401/A... but, it was supposed to be used with one of the 32x series scopes... both on batteries. I assuming (correct me please!) that it is now a collector's item... and so pricey!
Hi James:
Is there something about a 2465B that I am missing that would make it (I'm assuming) a good x,y display for something like a 1401? (32X series just dosn't compare to 24xx... except for porability.)
Best regards and wishes all.
Roy


Re: This message has not been downloaded from the server.

Glydeck
 

It’s the iPad. I get the same message. When I use the client on my computer it works fine. — George

On May 24, 2020, at 3:19 AM, satbeginner <@satbeginner> wrote:

:-)

Maybe the email client on your phone is set to not download attachments??

:-)