Hi Henrik I have a few 5082-3080 (NOS) hp diodes saved from one of my previous QRL's dustbin. I can send you a few if you like.
Best regards
Rien

If the holes are machine-screw threaded - not just holes - they are likely 10-32 NC. Crystal oven modules of the era and later often used this size. The "proper" plug screws on many oven modules often have cupped heads that carry an o-ring to serve as a gasket to keep dirt out, but you don't need to get that fancy. I think on these old HPs the holes were in the front panels, while the ovens were recessed back inside and not sealed? - depends on the model I would think. The original screws on many oven modules are typically nickel-plated steel or brass, with slotted pan-heads. For outside panel use, they may use something different and more decorative.

Ed

Steve

Drats, I’ve already ordered some from a vendor in Shenzen at a very good price but lengthy delivery.

Thank you very much for your kind offer.

How do direct prices / times compare with Farnell?

Direct prices are typically lower than Farnell or RS, though they do charge ?7 plus VAT postage.

Cheers
Dave

You can use a piece of copper tape, if you can't find the screws. We had a bag of the sealing screws at Microdyne, to replace any lost at the factory.

Here is a company that sells sealing screws:

开云体育

Dave forgot to mention that the door down in the basement is guarded by Jedi Engineers and Ninja Lawyers

All kidding aside since this is a leaded part you might just study the schematic for a bit and then buy a handful of different but inexpensive parts and try them in the circuit.??? In the 30+ years that have passed since the relatively??? new (back then) PIN diode were introduced that many newer parts??? with the advances in the technology may more than satisfy the requirement for this application

Dave

???

> Good idea AncelB, but I don't have data for the QPND 4709, I don't know
> which pin diode I can use as replacement, help would really be
> appreciated. Maybe someone with HP databook from the 1970 -1985 can find
> the data. This generator was produced around 1980 - 1985.

I recall reading, some years ago, that the "Q" prefix character on an HP
part number meant "special, non-stock item" - in effect, a house-
numbered part. They might be stock parts given a special number for
project-tracking purposes, or they might be from a stock-part run but
were specially selected for some particular characteristic (low loss,
tight specification spread, etc.) or they might be fully-custom parts
intended for just one particular use, or "leading edge" parts that HP
wanted to reserve for their own products as a competitive advantage.

So, I suspect you won't find them in a standard HP databook of any
era. You may find HPND parts - it looks as if Broadcom is now the
proud owner of the HPND product line - but I have my doubts that you'll
find an exact replacement unless you stumble across somebody who has
one squirreled away in a parts drawer down in an unused lavatory behind
a locked basement door with a sign saying "Warning, Beware Of The
Leopard!"

might
give you a place to look for a part which might be adapted to
your circuit.

Experimentation and trial-and-error are probably going to be your
best bet.

-- 
Dave
Manuals@...

Good idea AncelB, but I don't have data for the QPND 4709, I don't know
which pin diode I can use as replacement, help would really be
appreciated. Maybe someone with HP databook from the 1970 -1985 can find
the data. This generator was produced around 1980 - 1985.

I recall reading, some years ago, that the "Q" prefix character on an HP
part number meant "special, non-stock item" - in effect, a house-
numbered part. They might be stock parts given a special number for
project-tracking purposes, or they might be from a stock-part run but
were specially selected for some particular characteristic (low loss,
tight specification spread, etc.) or they might be fully-custom parts
intended for just one particular use, or "leading edge" parts that HP
wanted to reserve for their own products as a competitive advantage.

So, I suspect you won't find them in a standard HP databook of any
era. You may find HPND parts - it looks as if Broadcom is now the
proud owner of the HPND product line - but I have my doubts that you'll
find an exact replacement unless you stumble across somebody who has
one squirreled away in a parts drawer down in an unused lavatory behind
a locked basement door with a sign saying "Warning, Beware Of The
Leopard!"

might
give you a place to look for a part which might be adapted to
your circuit.

Experimentation and trial-and-error are probably going to be your
best bet.

开云体育

????????? What exactly are these plugs for???? If to cover unused connectors you can probably find plastic push-on covers for them.
????????? For more on this rig see:

Hi Jeremy

I doubt that it is BSP (British Standard Pipe, 55 degree thread angle) on American equipment it should NPT (National Pipe Thread, 60 degree thread angle)

Regards

George G6HIG
________________________________________
From: hp_agilent_equipment@...  on behalf of jn6wfo@... [hp_agilent_equipment] 
Sent: 21 July 2017 23:32
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Size of threaded plug in HP-103AR Oscillator?

My new-to-me HP-103AR Quartz Oscillator is missing the two threaded plugs that fill the access holes to the coarse and fine frequency controls on the front panel. Well, it feels like 1/8 BSP to me and my tap seems to fit the threads. Before I do something stupid, though, I wanted to ask the group if anyone had one of these and could check the threads. The plugs are NOT mentioned in the manual's parts list.

Jeremy





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Richard Knoppow
dickburk@...
WB6KBL

Hi Jeremy

I doubt that it is BSP (British Standard Pipe, 55 degree thread angle) on American equipment it should NPT (National Pipe Thread, 60 degree thread angle)

Regards

George G6HIG
________________________________________
From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of jn6wfo@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 21 July 2017 23:32
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Size of threaded plug in HP-103AR Oscillator?

My new-to-me HP-103AR Quartz Oscillator is missing the two threaded plugs that fill the access holes to the coarse and fine frequency controls on the front panel. Well, it feels like 1/8 BSP to me and my tap seems to fit the threads. Before I do something stupid, though, I wanted to ask the group if anyone had one of these and could check the threads. The plugs are NOT mentioned in the manual's parts list.

Jeremy

My new-to-me HP-103AR Quartz Oscillator is missing the two threaded plugs that fill the access holes to the coarse and fine frequency controls on the front panel. Well, it feels like 1/8 BSP to me and my tap seems to fit the threads. Before I do something stupid, though, I wanted to ask the group if anyone had one of these and could check the threads. The plugs are NOT mentioned in the manual's parts list.

Jeremy

Molex connector's rated current is for ambient
temperature of 25C, and 6 inches of appropriately
sized wire, in free air, on both sides of the
connector pair.

A lot of engineers, and hobbyists pay no attention
to the manufacturer's spec sheets, and simply assume
that a 7A connector can take 7A under any condition...

It can't.

-Chuck Harris

george g_einst@... [hp_agilent_equipment] wrote:

Hi Jim

Thank you for your original post, it has reminded me that I have a HP3586C that I very occasionally use as the test receiver when I carry out antenna development tests with another local amateur who lives about 5K away. Given that both of your 3586's have the same problem with the molex connector it has made me aware that the next time I dig mine out for use to check it for the same problem. Unusually for me mine came from a fellow test gear addict in refurbished condition with the result that I have not had the covers off it.

The molex connector that you have in a burnt state could be a problem to repair, The male half on the PCB is a simple matter with a rework station, however, the female portion will involve making quite difficult crimp connections especially to the wires with the burnt connectors on them due to oxidisation. These molex connectors are rated at 7A, presumably the same amps as used by the Chinese when giving the ah capacity of their secondary cells.

I see that a suggestion has been that you hard wire this connection, doing so may give you problems with access and reassembly. This is just a suggestion which will require a careful check on the space available, it is to use .25" fast on connectors. The male half is available as a PCB mount (solderable) and the female half has a good deep crimp surface for any unsolderable flying leads. You would of course have to carefully mark which lead goes where.

73 George G6HIG
________________________________________
From: hp_agilent_equipment@... <hp_agilent_equipment@...> on behalf of jim@... [hp_agilent_equipment] <hp_agilent_equipment@...>
Sent: 21 July 2017 18:10
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] HP-3586B PS problem - connector J2 overheating

Bill,

Thanks for that very practical recommendation regarding the Molex connector issue with overheating. Soldering. There are still 14 pins on the PS motherboard and I presume that the soldering would have to be done under that board where the pins are connected to the board. Otherwise, I would use a new connector with the accompanying wires to plug into the 14 pins and then solder those wires to wires on the transformer side after cutting off the bad connector. I have not looked at the connections under the PS board to see if they are solderable or not. I know that this is not very clear, but I can see the point of preventing any future overheating of the connection by soldering.

That was very interesting about the foam gas problem that affected the knobs. I noticed it on my HP-3702B and 3712A as well as some of the transmitters and receivers that I have that measure microwave channel distortion and a lot of other microwave transmission parameters that I don't really understand.

I acquired this equipment as a lot from a microwave facility workshop that had shut down around 2005. Out of the lot I was able to resuscitate a signal gen (HP-3336B), a spectrum analyzer (8659B), a power meter (432A), two selective level meters (3586B) and another SLM, a (3746A). There were also a couple of frequency meters (5342As), a live one and a dead one. The live one is still dodgy and still beyond my capacity fix properly.

They are all useful on the ham bench and all are within calibration tolerances that are acceptable for 'hobby use', as I call it. They all had service tags when I got my hands on them and all had minor problems. It appears that true microwave engineers will service tag anything that is not within .0001% of NIST standards. Hi. Level measuring was little affected by age, in my opinion, but frequency calibration was another story, of course. Aging had put frequency calibration all over the map, but by using a cheap GPS driven frequency standard I was able to get them all back within a Hz or so of each other and WWV. I used the 3586B and 3336B to approximate the frequency measuring setup of Bert's (K6OQK - )
and can measure frequencies on the air to near Hz standard, perhaps even sub-Hz, but I can't really be certain of that.

Now the other HP test equipment, that made up most of the lot, was for microwave transmission testing involving baseband measuring, channel distortion, 70, 140 Mhz (+/- 30) signals etc. My question is how, if possible, could any of those transmitters and receivers be used on the bench for conventional electronic applications involving ham radio, kit building or testing of any kind. I have a rough idea how those systems work, but no idea how to apply or use this equipment in any useful way. Next step is to go for the great quality internal parts.

In mentioning the knobs and the crumbling problem I did not mean to imply in any way the HP gear is cheaply made or not very durable. The knobs were an exception. I got started with this test equipment collection business in Cairo when I was living there for many years. I found out that some foreigners in our community would go to the City of the Dead Flea Market every Friday and pick up cheap antiques. I started going myself and found that every manner of electronic device manufactured over 60 years could turn up there in varying degrees of condition.

Over a period of about ten years there was not much in the way of ham equipment and testing gear I did not find there: Collins, Heathkit, Harris, Hallicrafters, Tek, 20s and 30s AM radios, Russian electronics (a lot of it and very poorly made), and so many parts. I took everything home that might have parts in it and I built a lot gear on the bench with those parts (I did not have a ham license there until the very end - SU9AM). So the HP gear, by far, providing the best quality parts, particularly tuning capacitors and coils.

I used a recovered 651B test oscillator for my signal generator and when I could no longer keep that running I used it's amazing tuning capacitor in a home brew VFO. One day at the bottom of a large pile of trash I spotted what looked like something HP. I had some help digging it out and found it was an 141T mainframe with two plugins. I had no idea what it was, but the screen was not broken or cracked so I took it home. It was pretty bent up and one of the plugins had damage near one of the knobs. It was also filthy. I obtained a schematic off the net and over the next few months after rewiring a plugin switch and doing some other basic maintenance and alignment I got it running again. It was good enough to bring home with me.

I brought home all my HP carcasses', as I called them, for spares. What I found in general was that at the City of the Dead most of the equipment that had been thrown away had been so because of minor faults, simple things like bad switches or even blown fuses. The locals in government who used this equipment did not have much in the way of budget for training or maintenance and if something failed the first response would be to throw it out and take a new one off the shelf. The new one off the shelf usually had been paid for by USAID ( our taxes) or some other donor. That was good news for me.

The most interesting finds there were probably a complete telephone kiosk from Orange County,CA with the 714 number still on the phone and a "Russian nose cone from a Mig fighter with the avionics still inside. Close behind were all the golf bags with clubs from all the golf courses around the U.S. Egyptian friends have told me that Cairo Airport left luggage is where just about everything that's lost in air travel ends up eventually. And I can tell you from experience that anything that is thrown out of a household (or stolen out of left luggage) in Egypt that is in anyway still usable 'in any way' ends up at the City of the Dead also.

Sorry about the long post. Thanks for the suggestion on the connector problem.

Jim
W3BH

Nope. I work on these things, I need space to take apart and stuff.

Oh come on, get the tongue in cheek! The office is the workspace and has equipment commensurate with
that. The rest is storage for less frequently used equipment.

Craig
-- ------------------------------
With best regards
Tam HANNA (e-mailing on a BlackBerry Q10)
On July 21, 2017 7:47:21 PM CEST, "'Craig Sawyers' c.sawyers@...
[hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:

Office, son's old room, garden shed, lockup.

A case of strong TEA.

Craig
---------------------------------

I may get into that realm using krytrons to create high energy fast rise pulses to study ionization wave effects in electrolytes.

Peter

I use an analog 2465B on my bench for a lot of troubleshooting. I also have a multi-GHz sampling 4 channel HP digital that's also good for 400 MHz.

Once in a while I use the fastest speeds to determine what causes what in "black box" digital circuits where I don't have the manual.

For RF probing at high impedance I use the analog scope and make sure I keep "BW Limit" off. I'm mostly looking for envelope so the sweep is relatively slow.

The bulk of my troubleshooting work is done at under 100 MHz and a lot under 20 MHz where I turn on BW Limit to have a nice clean trace.

I have a 7103 with the right plugins but rarely use it. In most cases the digital scope takes over the advantage of the MCP and I don't have anything which needs the extra bandwidth over 400 MHz.

Heck, my probes only go to 200 MHz.

The fastest speeds these days are all in design and test of high speed digital circuits such in fiber for telecom or disk arrays. If someone gave me a 50 GHz scope I would have no use for it and would immediately sell it off. A 1 GHz Lecroy? I'd probably keep it due to the larger screen and math functions but wouldn't really need the bandwidth.

Peter

What is the operating frequency range? Presuming it's low-RF to VHF that worked with a common DO- sized PIN, it should be no problem finding a generic one to try out. If you have the instrument manual and schematics, you should be able to estimate the driving current range, which is likely a couple to maybe 50 or 100 mA tops. You can try regular diodes too - they won't work quite the same, but close, as long as the frequency is reasonably high. Then you can do some work on the circuits until you find a suitable part.

HP used a lot of some very common PINs in nearly every piece of RF gear they made, for many purposes, so it may be possible to find salvaged instruments or pieces containing what you need.

Ed

Nope. I work on these things, I need space to take apart and stuff.
--
With best regards
Tam HANNA (e-mailing on a BlackBerry Q10)