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Re: Ebay madness Read and laugh !
I've seen instances similar to this in the past (haven't we all...) and asked about them. What has happened in many cases the seller has done a little research on ebay, but not enough to have a clue. They see the same or similar item with a huge offer or winning bid, not understanding that there is something special or unusual about that item that makes it worth (to someone) much, much more than an ordinary item would. A Tek 547 fell into this category just a few weeks ago, and the price has been falling like a stone ever since.
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-Dave -------------- Original message ----------------------
From: "Stan" <skurzetnb@...> There is a class of wheeler dealer bottom feeder that live at auctions. |
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Re: Ebay madness Read and laugh !
J Forster
If you look at his other sales, there are many very strange things. It
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looks to me like he bought a box of mixed spares and has no clue as to their value. He is also selling a 6080 tube for lots of $$. He mainly sells large industrial stuff apparently. Clueless, IMO. Best, -John microwaveengineer1968 wrote: Item# 160178331088, look at this item and at the other T+M stuff the |
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Re: Ebay madness Read and laugh !
Stan
There is a class of wheeler dealer bottom feeder that live at auctions. They have no expertise in any technical field. Simply bid on what nobody else wants on the theory ebay has a larger crowd and someone will buy it at a higher price. Well and good, but sometimes they get carried away when someone whispers the item in question is worth ten times actual, and they bid accordingly. I think we have all seen some doofus at an auction bid an absurd amount for something. Then of course, there is always someone who out of stupidity or avarice thinks he can find a sucker in the ebay crowd. Takes all kinds to make a world.
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Stan ----- Original Message -----
From: "microwaveengineer1968" <microwaveengineer1968@...> To: <hp_agilent_equipment@...> Sent: Thursday, November 22, 2007 8:15 PM Subject: [hp_agilent_equipment] Ebay madness Read and laugh ! Item# 160178331088, look at this item and at the other T+M stuff the |
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Ebay madness Read and laugh !
microwaveengineer1968
Item# 160178331088, look at this item and at the other T+M stuff the
guy has listed obiusly the guy is nuts ! This is a 8491B attenuator, very common in many labs,Agilent sells it for $254ea base price ! this guy asks a whopping $1250 buy it now ! and then does not even have a picture ! maybe the thing is gold plated, blessed by the pope or came of prez bush airforce one, i really like to hear the reason why this one is so expensive, i dare all smart... and people blessed with a good lot of sarcasm to write the guy and inquire about it ! |
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Re: 3 pin connector search
Benoit Robert
Hi Jim,
An option is to troll eBay for a donor probe. I did just that when I purchased a 1124A probe for $13 (IIRC). There are quite a few probes using this connector. Regards, -Benoit --- In hp_agilent_equipment@..., "wb5kye100" <wb5kye100@...> wrote:
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HP E1497/8A embedded VXI controller
Hi all,
I am going to recover a nice VXI rack with an E1497 controller. This is a risc based embedded controller running HP-UX. Any hints as to get this going again... of course the sw has been obsolete for many moons. I did recover HP-UX 10.2 for risc but no sign of the VXI specific stuff like SICL libraries or... Also, I think this has HPIB capability - is the 70000 series service software available for this platform, or only for 68k 200/300? Any info appreciated, the web only goes so far. Xtof |
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Re: Hp141+8553B+8552B and HP8601A
jaking
Your are on the right approach.
The 8601a 007 modification is shown on the circuit diagrams, in the 8601a manual off Bama. From memory it is just a coaxial cable and a capacitor. I have not done the mod, but it looks very simple to do Amazing hp offered it as an option. I don't have time to research getting the control signal from the 8223b, but it will feed in just the same way as a shielded cable as the 8443a, does it from the rear connector of the 141T. Any way at worst drilling some holes and running some coaxial cable should allow you to use the 8601a as tracking generator. Sorry do not have time to review this further, but I formed the opinion some time ago that it would be easy to use the hp801a as tracking generator. Yours sincerely ZL4AI _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of iw3sgg Sent: Thursday, 22 November 2007 9:14 a.m. To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: Hp141+8553B+8552B and HP8601A --- In hp_agilent_equipmen <mailto:hp_agilent_equipment%40yahoogroups.com> t@..., "jaking" <jaking@...> wrote: Hi ZL4AI, Thanks for repply. I'm looking the manual and I'm looking the HP8601.....I havent the option 7. I have only a VTO OUTPUT connector,the LO INPUT connector is not mounted on the rear pannel. If I read right I must connect the first LO OUTPUT op spectrum analyzer (HP8553B) to the LO INPUT of HP8601A. It is correct?? For you is possible to modify my HP8601A to ADD the 7 option?? Now I'm reading the manual from bama site. Thanks for repply again. Best regards. iw3sgg Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.15.30/1126 - Release Date: 12/11/2007 12:56 p.m. |
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Re: 8640B External Reference
k1ggi
Thanks to Arthur for the heads-up re changes in the 8640B over its
lifetime. Checking what I have on hand, it appears that units with s/n prefix 1552A and earlier will not have the jumpers, while s/n 1609A, 1625U and onward will have the jumpers. I dont know about prefixes, if any, lying between these. The 1609A, 1625U prefixes are covered directly in the printing of Aug 1976, which has both text and schematic referring to the jumpers. The 1552A is the tail end of coverage in the TM on BAMA, which starts out with no jumpers and stays there. There is no reference to changing the A8A3 board. Somewhere before mid-76 there was a complete re-layout of the A8A3 board. SO - to Dick, the OP - before you dig into the depths to look for jumpers, check your s/n prefix, or you will need to do what Arthur said with the xacto knife. 73,Ed,K1GGI |
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Re: 8640B External Reference
my appologies to mr. solomon
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the newer 8640b generators do have the jumpers on the board to make it work with an external 1 mhz standard. the older schematics show a board with no jumpers but the modificatiob could be effected using an ex acto knife / single sided razor blade and some 30 gage wire wrap wire. with the hp mod the unit will work with the internal standard with just a flip of the switch the 8640b was built over a long period of time so the earlier versions dont always jive with the last ones off the production line. personally i agree with mr. solomon that a 10 mhz input would be the way to go one should realise that the 8640b is an early 1970s design so hp should be forgiven and for when it was designed and how well it works its the best of its class. im assuming solomons gps master source has a sine wave outpiut? the way hp designed the 8640b ext input i dont think it cares what you put into it it appears like it isnt very level sensitive either i will have to check the specs like john miles i never use mine with an external time base ----- Original Message -----
From: Richard W. Solomon To: hp_agilent_equipment@... Sent: Wednesday, November 21, 2007 6:59 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference First, I wouldn't classify my response as an attack, more like a counter-attack. You come and ..."dis"... me, you are going to get it back with both barrels. The best response came from another list member who told me about the jumpers on the A8A3 board. The schematic clearly shows how to change the reference input from 5 MHz to 1 MHz. Just what I needed. As for your crack about "General Class Level", I assume you two are related ?? End of discussion and thread, 73, Dick, W1KSZ/7 -----Original Message----- >From: John Miles <jmiles@...> >Sent: Nov 21, 2007 3:16 PM >To: hp_agilent_equipment@... >Subject: RE: [hp_agilent_equipment] 8640B External Reference > >Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there? > >That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. > >-- john, KE5FX > >> >> I see your reputation for off-handed comments is well deserved. >> Too bad you have no clue what you are talking about and I don't >> wish to explain it to you. >> >> 73, Dick, W1KSZ/7 >> >> -----Original Message----- >> >From: arthurok <arthurok@...> >> >Sent: Nov 20, 2007 7:01 PM >> >To: hp_agilent_equipment@... >> >Subject: Re: [hp_agilent_equipment] 8640B External Reference >> > >> >a flip flop and simple low pass if needed is too >> much for an extra class ham to build up?? >> > > > > >Yahoo! Groups Links > > > |
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Re: 3 pin connector search
lothar baier
The HP Part# is 5060-0466 for the body and 5060-0494 for the sleeve, you can buy them at agilent however there are not cheap ($26ea) i dont know who made them for agilent but my guess would be switchcraft
wb5kye100 <wb5kye100@...> wrote: Hi - I'm looking for a source of the small 3 pin connectors (female and male) which were used on active rf probes for supplying power. Most of the vintage HP gear (network analyzers, spectrum analyzers) had a panel mount male connector for supplying +/- DC power. I've got a couple of homemade active RF probes that I plan on using with some HP equipment and want to use some of these connectors. I think that Tek used these same connectors. Anyone know the brand and where I may find some? Thanks Jim WB5KYE --------------------------------- Get easy, one-click access to your favorites. Make Yahoo! your homepage. |
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Re: 8640B External Reference
Richard W. Solomon
First, I wouldn't classify my response as an attack, more like a counter-attack.
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You come and ..."dis"... me, you are going to get it back with both barrels. The best response came from another list member who told me about the jumpers on the A8A3 board. The schematic clearly shows how to change the reference input from 5 MHz to 1 MHz. Just what I needed. As for your crack about "General Class Level", I assume you two are related ?? End of discussion and thread, 73, Dick, W1KSZ/7 -----Original Message-----
From: John Miles <jmiles@...> |
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Re: 8640B External Reference
www.tonnesoftware.com
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hes got some interesting stuff on his site a fellow ham i own a copy of his meter software but havent used it yet i looked at a pdf of the 8640b that i own 2 of both of my 8640b generators came to me needing repair from a guy who bought 3 of them and then sold me the 2 broken ones. it looks to me from viewing the circuit that the 8640b would work just fine using a square wave input the input amp looks to me like a transistor buffer with a little bit of hysterisis feedback to prevent noise multiple pulses you shoul;d see how i type 1 hand on the mouse and the other 1 fingering the keyboard. the 5 mhz oscillator drives a gate that gates the output of the oscillator and when the gate is disabled the 10 mhz output bnc can be used to jam a signal into the 1 transistor buffer. since the output of the buffer drives a divide by 5 chip i guess the system internally only requires 1 mhz i wonder if playing with the jumpers which arent shown on the schematic i looked at would still allow it to operate on the internal tcxo with just the flip of a switch?? from what i read dick has a very impressive toy collection. far superior to mine that i can barely afford. ----- Original Message -----
From: John Miles To: hp_agilent_equipment@... Sent: Wednesday, November 21, 2007 4:16 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there? That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX > > I see your reputation for off-handed comments is well deserved. > Too bad you have no clue what you are talking about and I don't > wish to explain it to you. > > 73, Dick, W1KSZ/7 > > -----Original Message----- > >From: arthurok <arthurok@...> > >Sent: Nov 20, 2007 7:01 PM > >To: hp_agilent_equipment@... > >Subject: Re: [hp_agilent_equipment] 8640B External Reference > > > >a flip flop and simple low pass if needed is too > much for an extra class ham to build up?? > |
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3 pin connector search
wb5kye100
Hi -
I'm looking for a source of the small 3 pin connectors (female and male) which were used on active rf probes for supplying power. Most of the vintage HP gear (network analyzers, spectrum analyzers) had a panel mount male connector for supplying +/- DC power. I've got a couple of homemade active RF probes that I plan on using with some HP equipment and want to use some of these connectors. I think that Tek used these same connectors. Anyone know the brand and where I may find some? Thanks Jim WB5KYE |
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Re: 8640B External Reference
John Miles
Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there?
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That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX
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Re: Hp141+8553B+8552B and HP8601A
Lothar thought that you wanted to drive one instrument with
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the other's scan ramp voltage. That would be a failure. If you can get the 8553's 1st LO into the 8601A, then it might be good enough. That's how HP did it before they built the 8443A and changed from the 8553L to the 8553B. What you lose with the old combination, is the Fine Tuning control and narrow scan width. As long as you can use >20kHz scan width, and you don't mind not having a digital frequency readout, it's almost as good as the 8443A. Regards, Dave Wise -----Original Message----- |
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Re: Hp141+8553B+8552B and HP8601A
Noris Battaino
lothar baier <microwaveengineer1968@...> wrote: Most likely this is not gonna work, its too inacurate, the 8601 is not synthesized and therefore will drift way too much
.. Thanks Lothar for repply. I'm afraid because I cant' measure HF filters (0-30Mhz). Best regards. Noris. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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Re: Hp141+8553B+8552B and HP8601A
Noris Battaino
David Wise <david_wise@...> wrote: The 8553B does not have a LO output jack, only the 8553L does.
To use a non-option 007 8601A with the 8553B would require 8601A modifications and a special cable to connect to the 141T. Regards, Dave Wise Thanks for repply . _,_._,___ Thanks for repply Dave....I have understand that with my hp8601 and my 8553B I can't measure filters like my tracking HP8444 and HP8555A!!! I'm afraid. Thanks again! Best regards. iw3sgg --------------------------------- Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now. |
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Re: Hp141+8553B+8552B and HP8601A
The 8553B does not have a LO output jack, only the 8553L does.
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To use a non-option 007 8601A with the 8553B would require 8601A modifications and a special cable to connect to the 141T. Regards, Dave Wise -----Original Message----- |
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Re: Hp141+8553B+8552B and HP8601A
iw3sgg
--- In hp_agilent_equipment@..., "jaking" <jaking@...> wrote:
Hi ZL4AI, Thanks for repply. I'm looking the manual and I'm looking the HP8601.....I havent the option 7. I have only a VTO OUTPUT connector,the LO INPUT connector is not mounted on the rear pannel. If I read right I must connect the first LO OUTPUT op spectrum analyzer (HP8553B) to the LO INPUT of HP8601A. It is correct?? For you is possible to modify my HP8601A to ADD the 7 option?? Now I'm reading the manual from bama site. Thanks for repply again. Best regards. iw3sgg |
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Re: Hp141+8553B+8552B and HP8601A
The 8601A employs the same mixing strategy as the 8553,
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with a 200-310MHz 1st LO. Option 7 adds rear-panel jacks to the 8601A to accept the 8553L's 1st LO output in place of the 8601A's internal 1st LO. You have to adjust the 8553's Fine Tuning control to center the TG in the SA RBW, and you can't use narrow sweeps, which tune the 8552's 47MHz LO instead of the 200-310. Dave Wise -----Original Message----- |
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