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Help needed with HP Pin diode.
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?I have a Schlumberger 4002 signal generator, I need help with a pin diode in this unit. The pin diode is QPND 4709?(HP manuafacture), I can't find it anywhere, I am looking for this or a replacement for it, would like a non smd, since layout is for leaded axial type. I have no experience with pin diodes and need help. The pin diodes is used for AM modulation and level adjustment of the carrier, please see the schematic I attached.? Thank you. Rgds Henrik ? |
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Hi Henrik if you want a simple single wire ended
pin diode you might find something like the older 5082-3001 or 3002 might work
in that application. They are only specc'd down to 10MHz in my very old HP book
(Aug 1967 !!) but should work as a modulator down to 1MHz because you can use
normal HS diodes for that. The pins will be better at the high frequency
end.
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Alan
G3NYK
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¿ªÔÆÌåÓýOn 07/21/2017 04:17 AM,
henrik.clement.sommer@... [hp_agilent_equipment] wrote:
? This is the output when I try and open this file: Warning: include(/mnt/den2-pri1-mnt/code/code/pb-htdocs/public/galleryd/desktop.php): failed to open stream: No such file or directory in /code/pb-htdocs/public/galleryd/index.php on line 122 Warning: include(): Failed opening '/mnt/den2-pri1-mnt/code/code/pb-htdocs/public/galleryd/desktop.php' for inclusion (include_path='.:..:../..:/usr/local/lib/php:/usr/share/php/Smarty') in /code/pb-htdocs/public/galleryd/index.php on line 122
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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 |
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Dave Platt
Good idea AncelB, but I don't have data for the QPND 4709, I don't knowI 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. |
¿ªÔÆÌåÓýDave forgot to mention that the door down in the basement is guarded by Jedi Engineers and Ninja LawyersAll 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 On 7/21/2017 8:20 PM, Dave Platt
dplatt-yahoogroups@... [hp_agilent_equipment] wrote:
??? -- Dave Manuals@... |
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Hi Rien
? Thank you for your kind offer, I think this is my best shot, I have been looking for pin diodes from this data sheet, since the 5082-3077 is used in the Stabilock for the same purpose, your 5082-3080 is very close. I need four of them, please let me know how much and I can send you the money. I live in denmark. Rgds Henrik |
G?ran Krusell