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Noise Figure Measuring System for sale....
pmanfre10
The system is the HP8970B, HP8971B and an Ailtech (Eaton) 7618e (or HP 346A or B)....is all in proper working condition ( currently serviced and verified). Noise figure meter is by itself good to 1.6 Ghz, and to 18 Ghz with external mixer (HP8971B.. which is included with the system), and also a proper LO Signal is needed. I have HP8970B and 8971B operation and service manuals on CD ...this is included (as well as the manuals for the 8970A, Eaton 2075-2, and lots of app notes on noise figure measuring). The Ailtech noise source is a model 7618e and has a calibration table covering 10Mhz to 18.0 Ghz...in current cal. (or can substitute an HP346A or B noise source for $300 additional). Pricing (only for info) ....8970B $1100, 8971B $1500 7618e $400 (or HP346A or B $700)...Sold as a package only ( will not seperate ) $3000 (or $3300 with HP346A or HP346B chose one) + Shipping. This is a super low price.....
Thanks, Pete WA2ODO |
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HP rf detectors
John Griessen
Craig Sawyers wrote:
1N25 series ~ 1-2GHz (L-band)[jg]Thanks. That means I already have some diodes that will be good enough to make a 2 diode detector as Ed Lawrence WA5SWD mentioned or as in for up to 2.4GHz low power measurements. Next to find out how to make a good resistor termination + diodes layout for 200 or 300 Ohm balanced transmission line coming 6 or so inches from a folded dipole antenna on pc board. John Griessen |
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Re: OT, but fairly basic question- rf detectors
and a gold pin on the other end marked 1N21B I have some other diodes like it from slotted lines. How do1N25 series ~ 1-2GHz (L-band) 1N21 series ~ 2-4GHz (S-band) 1N23 series ~ 8-12GHz (X-band) 1N78 series ~ 12-18GHz (Ku-band) 1N26 series ~ 18-26.5GHz (K-band) 1N53 series ~ 26.5-40GHz (Ka-band) They of course work at lower frequencies, but the construction optimises the noise figure in the microwave frequency range above. I've most commonly come across these as part of General Radio slotted line and impedance meter products, usually 1N21 and 1N23 in mixer and rectifier applications. Craig |
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Wanted - 141T or 140s Mainframe
I'm looking for a 141T or 140S empty mainframe to purchase. If anyone has one I can pry loose or knows somebody that would sell one, please let me know.
I'm located in Saxonburg, PA, about 30 miles north of Pittsburgh and could drive at least a 5 hour radius to pick one up. Otherwise, I'll pay shipping. Many thanks, Jim W3BH Saxonburg, Pa 16056 kjsorenson@... |
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Re: OT, but fairly basic question- rf detectors
J. Forster
One old diode I have is a gold plated cylindrical can with ceramic middleuA stands for Microwave Associates. That style of diode was used in WW II gear and up until the 1970s at least for S and X band mixers. Ther also came in an R version (reverse polarity) They are point contact, but I'd leave the screw alone. The diode has an adjusting screw on the flange end of the cylinder can!That's an HP X Band (10 GHz) WG detector, if I remember correctly. I have some other diodes like it from slotted lines. How do you tell howA slotted line is at least a 1/2 wavelenght long, so that'll give you some idea. What are you trying to do with the diode? If you are looking for something to level a sweeper or something, I'd look for something commercially made. A wire is not just a wire above a hundred MHz or so. FWIW, -John ============== |
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Re: HP 141T Test Accessories
Joe Na
There is a commercail company that now makes new replacement cables for the back of the 141. IIRC they're about $140 each. They do have a website and you should be able to find them pretty easily. if you can't let me know and I'll look up the name.
??? FWIW the old SUN and SGI monitors used a similar cable and the connectors on it were called a "13W3" connectors (3 coax, 13 standard conductors). I've tried to cut those apart and use the cables on the 141 but never could make it work but then again I'm not sure that my peripherals (other then the 141) are any good. The sun and SGI connectors are molded and are a B#^&* to get apart! At 08:39 PM 9/21/2009, you wrote: Where can I get an extender board (HP P/N 11592-60011) for testing PC boards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution. Are the connectors available to make a cable? ----------- --------- --------- ------- Yahoo! Groups Links [Non-text portions of this message have been removed] |
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Re: OT, but fairly basic question- rf detectors
Joe Na
John,
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?? The 1n21B is an OLD diode! That style is what we used to call a 'Microwave' diode back when I was a kid in the early 1960s and it was OLD even then. In fact those are the first self-contained diodes ever built. They were developed during WW II and they talk about them in the MIT Radiation lab books that describe electronics developments made during the war. It's a silicon diode and you're right it does use a cat whisker! The screw moves the whisker around on the crystal for the best contact and they're then potted with wax so don't move the screw unless you have to and unless you know what you're doing. I have no idea how high the 1N21s go in frequency or how good they are relative to newer diodes but I strongly suspect that the newer diodes are much better! --- On Tue, 9/22/09, John Griessen <john@...> wrote:
From: John Griessen <john@...> Subject: Re: [hp_agilent_equipment] Re: OT, but fairly basic question- rf detectors To: hp_agilent_equipment@... Date: Tuesday, September 22, 2009, 5:22 PM ? Alan Melia wrote: I have collected a number of Marconi, GR and, and HP diode detectors most would be overkill as they are rated to 10GHz or higher. fredschneider2001 wrote: > Here is some info about those things. Very easy to make when it's under 1GHz. > . mcmaster. ca/~elmer101/ sqlaw/sqlaw. html Alan or anyone, How do you identify which of the old detector diodes go up to 2.4GHz? That's the frequency where I want to do some relative measurements to select good antenna layouts for peak power transfer with milliwatt chip radios. I'll be teeing off of a folded dipole antenna fed to a dummy load of 200 Ohms, (the antenna impedance), to go to the detector. One old diode I have is a gold plated cylindrical can with ceramic middle and a gold pin on the other end marked 1N21B and "microwave" and uA surrounded by a square. The diode has an adjusting screw on the flange end of the cylinder can! Does that mean cat whisker connection? That one is part of a X485B detector mount that attaches to 1cm X 3cm waveguide. I have some other diodes like it from slotted lines. How do you tell how fast they are? John Griessen |
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Re: OT, but fairly basic question- rf detectors
John Griessen
Alan Melia wrote:
I have collected a number of Marconi, GR and, and HP diode detectors most would be overkillfredschneider2001 wrote: Here is some info about those things. Very easy to make when it's under 1GHz. Alan or anyone, How do you identify which of the old detector diodes go up to 2.4GHz? That's the frequency where I want to do some relative measurements to select good antenna layouts for peak power transfer with milliwatt chip radios. I'll be teeing off of a folded dipole antenna fed to a dummy load of 200 Ohms, (the antenna impedance), to go to the detector. One old diode I have is a gold plated cylindrical can with ceramic middle and a gold pin on the other end marked 1N21B and "microwave" and uA surrounded by a square. The diode has an adjusting screw on the flange end of the cylinder can! Does that mean cat whisker connection? That one is part of a X485B detector mount that attaches to 1cm X 3cm waveguide. I have some other diodes like it from slotted lines. How do you tell how fast they are? John Griessen |
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Re: 332A balance pots
the pots are beyond repair??
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----- Original Message -----
From: mike To: hp_agilent_equipment@... Sent: Tuesday, September 22, 2009 6:13 AM Subject: [hp_agilent_equipment] Re: 332A balance pots Excellent suggestions guys, thank you. I like the idea of pots inside the chassis, given the sensitivity of the bridge and it will keep it neater. A NOS pot appeals mostly because of simplicity and my desire to stay as close to original as possible but two separate new pots might be a very nice way to do it. Mike |
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Re: 332A balance pots
Excellent suggestions guys, thank you. I like the idea of pots inside the chassis, given the sensitivity of the bridge and it will keep it neater. A NOS pot appeals mostly because of simplicity and my desire to stay as close to original as possible but two separate new pots might be a very nice way to do it.
Mike |
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Re: HP 141T Test Accessories
The cables are available....at a price. The cable between the if unit and
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the rf unit is the most difficult because it is a hybrid D-type with coax inserts. The cables from the frame to the units is relatively straightforward the connectors are from the McMurdo blue range. (we bought red ones that seem to fit, but they were about $20 each. I think they are still stocked by Newark or Allied) These can often be found used "under the table" at flea markets, I believe. You can probably manage without the covers for this application. The pcb connector is I think a 4mm spacing, this is not common now but can be found amongst older bits......I even found some "veroboard" (you call it vectorboard I think) with that spacing and a gold plated connector, but was able to get hold of a couple of extender boards that will fit, though they carry another part number code. You can do a lot by taking the covers off the frame and the top cover off the RF unit and the lower cover off the IF unit (which allows access to the connector "backplane" before reinserting them. Just take care to keep away from the tube supplies!! I made a sheet of thin stiff plastic, folded to slot in over the tube compartment, for safety. Alan (G3NYK) ----- Original Message -----
From: "ardy41" <donley.dn@...> To: <hp_agilent_equipment@...> Sent: Tuesday, September 22, 2009 1:39 AM Subject: [hp_agilent_equipment] HP 141T Test Accessories Where can I get an extender board (HP P/N 11592-60011) for testing PCboards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution.
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Re: HP 8662A parts needed
Thanks for the help guys, john miles has kindly offered me a panel (Thanks John!). Hopefully one day I will have enough useful bits to be able to help others with donor parts.
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Regards, Matt --- In hp_agilent_equipment@..., Richard Parrish <calcntr@...> wrote:
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Re: OT, but fairly basic question- rf detectors
Here is some info about those things. Very easy to make when it's under 1GHz. I made several using geramnium, schottkey and kristaldiodes. For small signals with lowlevel the shunt type is the best option I think.
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Fred --- In hp_agilent_equipment@..., "Alan Melia" <Alan.Melia@...> wrote:
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Re: Fluke
Peter Loron
I don't know if it is active or not, although I did look through the Fluke groups and didn't see one with very many members.
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Since you mention Scopemeters, I have a 123 which isn't starting up. I've determined that it has power, and using the keys to start up in mask mode gives a softer beep than then normal startup. All I get is the beep and the screen backlight coming on. Nothing else. I haven't gotten a chance to try any of the further troubleshooting steps in the service manual... -Pete On Sep 21, 2009, at 3:49 PM, Paul Kraemer wrote:
Pardon the off topic querry but does anyone know if the Fluke group on Yahoo |
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Re: HP 141T Test Accessories
The connectors should be available from William Perry Company.
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73 Glenn WB4UIV At 08:39 PM 9/21/2009, you wrote:
Where can I get an extender board (HP P/N 11592-60011) for testing PC boards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution. |
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Re: HP 8662A parts needed
Richard Parrish
I'm sure I have a front panel in my junk room if you'll pick up the postage.
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Richard Parrish calcntr@... --- On Mon, 9/21/09, Didier Juges <didier_juges@...> wrote:
From: Didier Juges <didier_juges@...> Subject: Re: [hp_agilent_equipment] HP 8662A parts needed To: hp_agilent_equipment@... Date: Monday, September 21, 2009, 7:59 PM ? Matt, if you do not find a panel, I'll be glad to take the best hi resolution picture I can of mine. You may be able to get a new one made using photo-sensitive aluminum sheets. I do not know where these are available nowadays, but I have used that material in the past with reasonable success (if you are desperate enough, YMMV) Didier KO4BB ____________ _________ _________ __ From: macurlis <macurlis@yahoo. com.au> To: hp_agilent_equipmen t@yahoogroups. com Sent: Saturday, September 19, 2009 5:13:54 AM Subject: [hp_agilent_ equipment] HP 8662A parts needed Hi Group, I've nearly completed rebuilding a 8662A that was in a horrible state. The nicd pack had exploded long ago and the fan had helped the corrosion spread all around. As well as that it was caked with dust worse than any instrument i've seen. Anyway after stripping, washing (!) and fixing corrosion related issues it basically works. The only thing which is beyond repair is the front-left sweep panel, the battery acid seems to have eaten the lettering of the panel. So is there anyone out there who has a donor unit with a this panel? I'd even be happy with fairly average one. Also it seems to have some failed LED modules, does anyone know if they are still available? Corrosion may have killed these aswell. I think they are also used in the 8640B. HP part nm. 1990-0330 Matt |
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Re: HP 8662A parts needed
Didier Juges
Matt, if you do not find a panel, I'll be glad to take the best hi resolution picture I can of mine. You may be able to get a new one made using photo-sensitive aluminum sheets. I do not know where these are available nowadays, but I have used that material in the past with reasonable success (if you are desperate enough, YMMV)
Didier KO4BB ________________________________ From: macurlis <macurlis@...> To: hp_agilent_equipment@... Sent: Saturday, September 19, 2009 5:13:54 AM Subject: [hp_agilent_equipment] HP 8662A parts needed Hi Group, I've nearly completed rebuilding a 8662A that was in a horrible state. The nicd pack had exploded long ago and the fan had helped the corrosion spread all around. As well as that it was caked with dust worse than any instrument i've seen. Anyway after stripping, washing (!) and fixing corrosion related issues it basically works. The only thing which is beyond repair is the front-left sweep panel, the battery acid seems to have eaten the lettering of the panel. So is there anyone out there who has a donor unit with a this panel? I'd even be happy with fairly average one. Also it seems to have some failed LED modules, does anyone know if they are still available? Corrosion may have killed these aswell. I think they are also used in the 8640B. HP part nm. 1990-0330 Matt |
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HP 141T Test Accessories
ardy41
Where can I get an extender board (HP P/N 11592-60011) for testing PC boards in the 141T plugins? Also needed is the cable (HP P/N 11592-60016) which connects the two plug-ins outside of the main frame. I know where to get a very expensive cable, but was looking for a more reasonable solution.
Are the connectors available to make a cable? |
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Re: OT, but fairly basic question- rf detectors
Hi Dave I have a 2000 under the bench somewhere it has a problem I havent
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sorted yet, I was hooked on those "compactrons" :-)) It is probably propping up the bench !! I think any "diode probe" circuit would do, even using a silicon 1N4148 or 1N914. these were not precision equipments and were used only at faily high levels. The return to the mainframe is generally for the mixing in of markers, and is not essential if you dont want the markers. I have collected a number of Marconi, GR and, and HP diode detectors most would be overkill as they are rated to 10GHz or higher. Alan G3NYK ----- Original Message -----
From: <d.seiter@...> To: "hp agilent equipment" <hp_agilent_equipment@...> Sent: Monday, September 21, 2009 11:45 PM Subject: Re: [hp_agilent_equipment] Re: OT, but fairly basic question- rf detectors Hi John, Actually, I have 4 analysers... The issue is that this sweeper is designed so that signal goes out to the DUT, through the detector and back into the sweeper before returning out again as H and V signals for a scope or plotter. The detector expected is a simple BNC in/out type. -Dave ----- Original Message ----- From: "John S" <John@...> To: "hp agilent equipment" <hp_agilent_equipment@...> Sent: Monday, September 21, 2009 2:30:40 PM GMT -08:00 US/Canada Pacific Subject: [hp_agilent_equipment] Re: OT, but fairly basic question- rf detectors Dave: I'm assuming that you don't have access to a spectrum anlyser..... How about just plugging up to an oscilliscope with a 50 ohm thro-termination (or equivalent) ?? 0dBm = 0.632v p-p John --- In hp_agilent_equipment@... , d.seiter@... wrote: working correctly, but in order to ~calibrate it (or even completely verify operation) and need an appropriate rf detector.? The user manual is no help, "see our literature for recommended detectors", ...right...? The only plugin modual I have spans 0-20Mhz, so we're not talking high speeds here.? There's got to be a simple schottky based circuit that would work here.?
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Jim Sorenson
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