开云体育

I can't believe I missed that, I must be slacking off!
As Sulu would? say, "Oh Myyyyyyy"
-Dave

From: Harvey White <madyn@...>
To: [email protected]
Sent: Friday, May 4, 2018 9:53 AM
Subject: Re: [TekScopes] New acquisition: Soviet 7000-series copies

On Fri, 4 May 2018 02:33:08 -0400 (GMT-04:00), you wrote:

According to Lt. Sulu on Star Trek, the Russians invented everything!

Ensign Chekov.

Harvey

Michael A. Terrell

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

From: Dave Seiter <d.seiter@...>

I was trying to figure it out, and the only thing that seemed to make any sense was advertising- They wanted to ensure that any English-speaking person who happened to see such a fine scope would know that the great soviet was responsible for it (and it was all their own design, of course!)
-Dave?

Chris,
I have used the leadless 1I308(not sure of letter designation) with sprung brass contacts and not managed to destroy it yet!

Switching time for tunnel diodes is set by the ratio of peak current to junction capacitance so not only do you need high current devices but also low capacitance, the device I have is 20mA but not particularly low capacitance, there is some data on the web for 'parameters of Russian Tunnel Diodes' or similar, if you don't find it I can mail you a copy. The fast switching Ge diodes all generate around 300mV steps, set by the band gaps and loadline with a small effect due to impedance matching.

Roger

I wish that they had kept it! :(

Michael A. Terrell

On Fri, 4 May 2018 13:15:59 -0400 (GMT-04:00), you wrote:

You're right. I haven't had a decent night's sleep in years, and I have too many doctor's appointments or I would have remembered that it was the other half of that team. I have averaged under four hours of sleep, a night for the past decade and many nights are under two hours.

Remember that Russians inwented sleep deprivation first.

Harvey

Michael A. Terrell


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

From: Harvey White <madyn@...>

On Fri, 4 May 2018 02:33:08 -0400 (GMT-04:00), you wrote:

According to Lt. Sulu on Star Trek, the Russians invented everything!

Ensign Chekov.

You're right. I haven't had a decent night's sleep in years, and I have too many doctor's appointments or I would have remembered that it was the other half of that team. I have averaged under four hours of sleep, a night for the past decade and many nights are under two hours.


Michael A. Terrell

All,

I have a transformer from a TM-506 frame available free for USPS postage from 80503 (Colorado).

Please respond directly to me at kc0wjn at gmail dot com. I will ignore any responses posted to the list.

First come, first served.

Thank you.

DaveD

On Fri, 4 May 2018 02:33:08 -0400 (GMT-04:00), you wrote:

According to Lt. Sulu on Star Trek, the Russians invented everything!

Ensign Chekov.

Harvey

Michael A. Terrell

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

From: Dave Seiter <d.seiter@...>

I was trying to figure it out, and the only thing that seemed to make any sense was advertising- They wanted to ensure that any English-speaking person who happened to see such a fine scope would know that the great soviet was responsible for it (and it was all their own design, of course!)
-Dave?

The LF plugin is the 8556A. With an 8552A IF plugin, you can get down to 50Hz RBW. The superior 8552B can do 10Hz. The 1kHz you're thinking of is the minimum center frequency on the 8553 RF plugin.

The reason the 8556A only tunes up to 300kHz is that it's a fixed upconversion (allowing trims on the mixer to null out oscillator play-through), using the IF plugin's tuning range which can't exceed its input passband.

Dave Wise
________________________________________
From: [email protected] <[email protected]> on behalf of Ed Breya via Groups.Io <edbreya@...>
Sent: Thursday, May 03, 2018 10:10 PM
To: [email protected]
Subject: Re: [TekScopes] Using network analyzers below their stated bandwidth?

Forgot to mention one thing - an old (1970s) example of doing something like this is in one of the HP141 modular RF/microwave spectrum analyzer systems. There's a plug-in (I forget which model - maybe 8553 or close) that goes from very low to 300 kHz or so. It upconverts the baseband to (as I recall) 50 MHz, which is one of the IFs of the system. The rest brings it back down to its 3 MHz IF for detection, logging, and display. The result is limited by noise and the stability of the LOs and the RBW of the crystal filters - about 1 kHz I think, which isn't all that great for audio.

This sort of thing is a way to get baseband up into the range of RF equipment. But again, why bother if you can figure it out directly?

And one last thing. If this application is for an audio network analyzer only, and not generally a spectrum analyzer, then no SDRs or SAs or RF stuff is needed at all - just generate test frequencies and measure the results, say with a low frequency generator and an AC voltmeter or detector. Maybe a PC sound card and software is enough. If you want something already built and ready to go, maybe an HP3561A or something similar and much newer and better would do.

Ed

Thanks for posting the pictures

I needed that.

Worked on and taken a lot of stuff apart, but I have never seen Russian
electronics.

John

Back in the late 60's I worked at HP incoming inspection. They used an exotic, tiny, tunnel diode in
a
pulse generator. I don't remember the current rating. They were lead-less and expensive. About
$110.00 each. They were tested individually and photographed on a curve tracer.and the photo stayed
in a file for the device There was a spring loaded adapter that just sandwiched the diode between 2
contacts. Occasionally one would get dropped and then a search of the floor space ensued until it
was
found.
Leonard

That is interesting to know! I have a 1108A tunnel diode mount with the 1105A pulse generator that
goes with it. Works perfectly!

Craig

On Fri, 4 May 2018, cmjones01 wrote:

You can find 1I308K (or GI308K that is non-military version) on Ebay. They
are still available NOS from former USSR.

I know tunnel diodes crop up here from time to time in fast pulse
generators and timebase triggers. I'm trying to get my Soviet Ya4S-89
pulse generator working properly, and by experimentation and deciphering
the manual in Russian, it's become clear that it's designed to drive
external pulse-shaping cables which contain a tunnel diode. The output
waveform I see looks exactly right, so now I need the tunnel diodes to go
with it.

The manual specifies type 1I308K, which is a 50mA type. I guess this high
current gives a usefully large pulse amplitude with good risetime into a
50R load. The trouble is, most of the tunnel diodes I can find online
have currents in the range 1mA-5mA, which clearly won't do. The highest
current I've seen so far has been 20mA.

Does anyone here think there's any chance of finding a 50mA tunnel diode
these days? Or should I bite the bullet, tweak some resistor values in
the pulse generator, and go for a 20mA type, putting up with reduced
output amplitude?

Thank you
Chris

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*

You're forgetting that it was a solid fuel engine, and that the engine housing didn't heat evenly. It was hottest at the output, and coldest at the top of the engines. The differential would have cracked welds and the problems would have gotten worse each time a booster engine was reused. Below the rated temperature, the seals couldn't be certified to contain the exhaust gasses. There was a book covering the technical details of the designs, and their reasons. I read it years ago, I think it was called 'A Major Malfunction'.


Michael A. Terrell

I've found the analog discovery most useful for low frequency work.
Not because it is especially great hardware, but it comes with
ready-made software and is relatively affordable.
Often the software that comes with this type of toy is poor and buggy,
but the network analyzer portion is well made in my opinion. It still
picks the spot frequency out of a very noisy switchmode supply with
great dynamic range so you can do control loop analysis. I wouldn't
want to use the scope part of the software for anything, it's crap.

<>

If you want a step up from a sound card with more frequency range and
at least rudimentary input attenuators this is a good choice.

ST

On Fri, May 4, 2018 at 4:21 PM, ebrucehunter via Groups.Io
<Brucekareen@...> wrote:

If you are looking for an audio frequency network analyser, look at Bob Larkin's article: DSP-Based Vector Network Analyser for 10 Hz to 40 kHz in the May/June issue of QEX Magazine. You would have to assemble your own; however, boards and the software have been made available.

Bruce, KG6OJI

Back in the late 60's I worked at HP incoming inspection. They used an exotic, tiny, tunnel diode in a pulse generator. I don't remember the current rating. They were lead-less and expensive. About $110.00 each. They were tested individually and photographed on a curve tracer.and the photo stayed in a file for the device There was a spring loaded adapter that just sandwiched the diode between 2 contacts. Occasionally one would get dropped and then a search of the floor space ensued until it was found.
Leonard

If you are looking for an audio frequency network analyser, look at Bob Larkin's article: DSP-Based Vector Network Analyser for 10 Hz to 40 kHz in the May/June issue of QEX Magazine. You would have to assemble your own; however, boards and the software have been made available.

Bruce, KG6OJI

On Thu, May 3, 2018 at 08:54 am, ykochcal wrote:

Now your just teasing us, what's under that cover of that plugin?????

Ask and ye shall receive. I've just broken the 1989-vintage factory seals on the timebase plugin, because it's not working properly, and taken some internal photos. They're on TekWiki here:



Chris

On Fri, May 4, 2018 at 05:13 am, Brian Cockburn wrote:

Thanks Jay,

Sadly no 'Ship Date' for my 2245A.

Brian.

I recently worked on a T922 and it actually had a date hand written inside the case in "Oct 20 1978", not sure if this was standard practice or not. My TDS460 had several date stamps on various components, including the CRT and mains transformer.

On Thu, May 3, 2018 at 03:03 pm, Michael A. Terrell wrote:

My understanding is that there were two reasons. First of all, they had to
build the engines in sections, and secondly they had different thermal
expansion rates.

I hope not to sound too stupid here but...

Why would they use materials of different thermal expansion coefficients ? Even if more heat is generated in one section than the other, I find it hard to believe that was the right choice, and I assume money was practically no object.

That is was built ion sections, with limited information here I assumed it had something to do with transportation. While state law could be suspended and highways closed for such a special transport, there is still a limit as to just how large of an object can be physically transported.

I think it is a damn shame they retired those without a viable replacement. They seem to be losing the last of their brain cells. Not that the shuttle did this, but now from what I understand we buy rockets from Russia to do maintenance of our satellites ???

Is that smart from a national security standpoint ? I have my doubts to say the least, even though the pundits are overblowing the differences between the two superpowers, it is not hard to become enemies in this world of pipeline wars etc.

I am not sentimental but I see it as a bad time when they retired those craft, and I think they should have kept a few of those SR-71/YF17s around. These were some significant accomplishments in their time.

On Fri, May 4, 2018 at 05:23 am, Craig Sawyers wrote:

Now to figure out how to mount those leadless packages safely. I'm assuming

that soldering isn't a

good idea, though perhaps I'd get away with it with fine wires and deft

technique. Not sure I want

to
try though!

The way that Tek did that was via sprung pressure contacts to both faces of
the pill. Such as in the
type 284 and S52. These were integral to a transmission line structure.

That's good to know. At the moment I'm visualising a bit of gold-finished PCB with a hole drilled the right size for the pill, edge-mounted SMA connectors for the input and output, and a spring contact fashioned from the insides of an abandoned relay or similar. Could be quite neat, and maybe the tunnel diode could be fitted either way up for the two different polarities.

Chris

Ah! Thank you for that. Not sure how I didn't spot it. Duly ordered - I figured it was worth the
cost to
turn a technical curiosity into a genuinely useful tool.

Now to figure out how to mount those leadless packages safely. I'm assuming that soldering isn't a
good idea, though perhaps I'd get away with it with fine wires and deft technique. Not sure I want
to
try though!

The way that Tek did that was via sprung pressure contacts to both faces of the pill. Such as in the
type 284 and S52. These were integral to a transmission line structure.

Craig