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Re: OT, but fairly basic question- rf detectors
Hi John,
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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:
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Re: OT, but fairly basic question- rf detectors
Be careful! your "RF detector must have a wide enough bandwidth to "see"
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the signal at full amplitude. Perhaps you can borrow a good HP Power Meter to do the job. As a last ditch' approach, a capacitance coupled full wave detector using a pair of good diodes in series, the mid point cap coupled to the RF signal to be detected, first diode other end connected to ground, the remaining diode end connected to a resistor and bypass cap will develop very close to peak -to-peak voltage. That you can easily convert to RMS. Ed Lawrence WA5SWD -- You and I are each unique, just like everyone else! -------------- Original message ----------------------
From: "John S" <John@...>
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Re: OT, but fairly basic question- rf detectors
Dave:
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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:
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Re: 332A balance pots
I think that this is not a good application for ten-turn pots,
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especially not a single one. You'd be forever cranking it from one end to the other. Two single-turn pots, one Coarse one Fine, is right for this job. The only trouble with the existing ones is (a) they get scratchy, and (b) the concentric arrangement exacerbates it. Considering that the top end of the 33x is 600kHz and it's a sensitive bridge, I'd be leery of remote-mounting a wirewound pot. In my case, the old outer-shaft Fine pot was serviceable, and I needed a new Coarse pot. Although you can find NOS original pairs, I think it's money wasted, because they're old, plus as an experiment I tried ganging a new pot, and it turned out that new pots are also susceptible to shaft motion. It was just a bad idea from the get-go. I installed it alone in a new location, and use it along with the old Fine pot. It's probably the best-balancing 332A in existence. Or ever :) (Not that I use it much, now that I scored a 339A.) Dave -----Original Message----- |
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Re: 332A balance pots
J. Forster
Is there room to mount a multiturn pot in place of the ganged one?
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-John =================== Or mount a mini box on the side with a pair of NOS hamfest 10T Bournes |
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Re: 332A balance pots
Geoff
Or mount a mini box on the side with a pair of NOS hamfest 10T Bournes which might cost $1 each. Shielded leads, good grounds, and all that fancy stuff.
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G ----- Original Message -----
From: David Wise To: 'hp_agilent_equipment@...' Sent: Monday, September 21, 2009 3:44 PM Subject: RE: [hp_agilent_equipment] 332A balance pots I've been there. Scratchy balance pots are the 331/332's bane. When you rotate the FINE pot (outer shaft) it wiggles the COARSE (inner) shaft around; even the slightest motion can exceed the entire range of the FINE pot. In my opinion HP screwed up, never should have made them concentric, or perhaps put FINE on the inside, as the outer shaft is less susceptible to mechanical disturbance. The only way to achieve smooth control in these instruments without spending crazy money is to discard the concentric arrangement and mount a separate COURSE pot elsewhere on the front panel. (My FINE pot was, er, fine. :) The memory is faded, but I think I used a 1/8"-shaft panel-mount conductive plastic pot, about five dollars from Mouser, and there was just enough room near the original pot and sort of diagonal to it. This mod eliminated all swearing. HTH, Dave Wise > -----Original Message----- > From: hp_agilent_equipment@... > [mailto:hp_agilent_equipment@...]On Behalf Of Michael > Sent: Sunday, September 20, 2009 3:52 AM > To: hp_agilent_equipment@... > Subject: [hp_agilent_equipment] 332A balance pots > > > Hi guys. Was wondering if anyone knew of a new/NOS source for > the dual concentric balance pots in these things? After > restoring my 332A it works fantastically except that I would > like to put a new balance pot in her. > > Cheers > Mike |
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Re: 332A balance pots
I've been there. Scratchy balance pots are the 331/332's bane.
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When you rotate the FINE pot (outer shaft) it wiggles the COARSE (inner) shaft around; even the slightest motion can exceed the entire range of the FINE pot. In my opinion HP screwed up, never should have made them concentric, or perhaps put FINE on the inside, as the outer shaft is less susceptible to mechanical disturbance. The only way to achieve smooth control in these instruments without spending crazy money is to discard the concentric arrangement and mount a separate COURSE pot elsewhere on the front panel. (My FINE pot was, er, fine. :) The memory is faded, but I think I used a 1/8"-shaft panel-mount conductive plastic pot, about five dollars from Mouser, and there was just enough room near the original pot and sort of diagonal to it. This mod eliminated all swearing. HTH, Dave Wise -----Original Message----- |
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OT, but fairly basic question- rf detectors
Ok, so I have Telonic SM-2000 sweeper from about '64, which appears to be 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.?
Any ideas?? Thanks!? -Dave [Non-text portions of this message have been removed] |
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Re: HP 5326 counter repair question
--- In hp_agilent_equipment@..., "Antonio" <afalcao@...> wrote:
If I understand correctly -5V is read by a multimeter (assuming the (-) probe of your multimeter is on the black terminal), connected at the DVM input terminals.Yep, that true. Now let's start some tests:No difference. The thing is that if I measure it with a high impedance meter (+100Mohm) it's -5 Volts. (it changes while turning the zero pot between about -9 and -4.5V so I put it on 5 as a reference. On a 10Mohm it's 2,5V and on a analoge AVO 8 or simpson there is no voltage. That's because it's own entrance is about 10Mohm I think. The first question is if -5V is present at ANY position of the DVM range (10V, 100V, 1000V) switch and the READ and READ B of function switch.Yes.that was the case but not any more Q3 at A12 was shorted. After replacement there is -5 at 10V, -2,5 at 100V and -0,25 at 1000V (If I remember the numbers right) So now the relais are switching again. But something else I noticed. I removed all the relais. Then the display had zero's like it should with all relais without a driver. After placing every transistor it stayed zero until I replaced Q3 with an original and tested transistor. Then the display started showing around 5V again. So it must be in that surrounding. If it is always present, I would simply pull out A12 and see if the display zeroes. If the display read near zero at this condition, the V to F (A13 board) and the remaining circuits can be considered good and the cause is really A12.Whitout A12 all is zero. First check continuity at pins 13 and 14 of the A12 card edge slot. This connection is the feedback path of the buffer and is completed at A13 (see schematic). If wrong it can lead to imbalance in the buffer stage and cause strange behavior.They are OK. zero ohm. If O.K., check diodes CR2 and CR3.They are OK too, it makes also no difference if I unsolder them or if they are in place. Short gate of FET Q7A to signal earth and put A12 back. The display > should zero if buffer amp is operating correctly.The nixies do go to zero. If it zeroes search for some input-switching leak putting -5V inI will look in that way. There is not much on that board. I measured all the pins without the A12 board and only pins pair 15 showed a strange value. All relais drivers had about 5V on the basis but the one behind pin 15 only 0,2V. For the rest no strange signals entering. There was a 2n2906 instead of the original transistor but I replaced it with a tested 2n964 like there should be. So now I have not -5V on all positions anymore (10,100,1000V) but there is still a leak. If I put a DC voltage on tje input terminals there is no reaction. It does not meassure even not when I apply 30V. Thanks for the advise. I'm glad I know something more now. Fred Antonio Falcao
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Re: SA Module ID Help Please
J. Forster
Thanks Glenn & Jose. If anyone can test them (or is interested in them)
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please contact me off-list. Best, -John ================ Hello John, |
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Re: FS: HP8568b 1.5 Ghz Spectrum Analyzer with HP8444a Opt. 59 Tracking Generator
Jose V. Gavila
Hi Marco,
At 18:04 20/09/2009, you wrote: The 8444A opt.058 is almost the same as the opt. 059. Only, theOK, thanks for the info!. Well, at least it covers the 1.2GHz amateur band :-) Regards, JOSE ------------------------------------------------- 73 EB5AGV - JOSE V. GAVILA IM99sm La Canyada - Valencia (SPAIN) Vintage Radio and Test Equipment RadioRepair BLOG European Boatanchors List Amateur Repairs List |
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Re: SA Module ID Help Please
Jose V. Gavila
Hello John,
At 21:44 20/09/2009, you wrote: I picked up some modules from an HP SA today, but don't know which SA theyThey seem to me as 8566 parts. Regards, JOSE ------------------------------------------------- 73 EB5AGV - JOSE V. GAVILA IM99sm La Canyada - Valencia (SPAIN) Vintage Radio and Test Equipment RadioRepair BLOG European Boatanchors List Amateur Repairs List |
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Re: SA Module ID Help Please
Looks like these came from a 8566B.
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See (amp%2Fconverters)_W0QQitemZ160363523459QQcmdZViewItemQQimsxZ20090919?IMSfp=TL090919198004r18744 73 Glenn WB4UIV At 03:44 PM 9/20/2009, J. Forster wrote:
I picked up some modules from an HP SA today, but don't know which SA they |
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Re: HP 16500A,B,C parts, 16515/16A pair
Greg Bowne
I have been trying to rebuild a 16500C for a while now.. could use a mainboard and perhaps a new frame/case/chassis.. the one I have is damaged.? The PSU also has some issues too.? But I will take any 16500C parts that anyone has.. especially the motherboard/mainboard.
Thanks, Greg Bowne ?>>> The information contained in this e-mail transmission is privileged and/or confidential intended solely for the exclusive use of the individual addressee. If you are not the intended addressee you are hereby notified that any retention, disclosure or other use is strictly prohibited. If you have received this notification in error, please immediately contact the sender and delete the material. ________________________________ From: John Griessen <john@...> To: hp_agilent_equipment@... Sent: Saturday, September 19, 2009 12:03:46 PM Subject: [hp_agilent_equipment] HP 16500A,B,C parts, 16515/16A pair ? I figured how to swap a good monitor from a 16500A to a 16500C after taking apart the A. No more dim view! 16500 Frame parts, odd screws, covers, strap, mainboard, touchscreen bezel/front panel assy, 3 or 4 of those projecting back side protector feet, power supply, card cage halves, floppy drives, blank filler card, fans -- are available cheap, (for a few days at least), via USPS from 78756 Austin TX. All the frame parts interchange between A,B,C. Not sure about the power supply -- different part number even though looks same. No bottom feet or boot discs though. Extra plugin modules: 16515/16A 1000MHz state/timing plugin pair with 32 coax probes $75 16510A LA 25MHz-state/ 100MHz-timing with probe leads but can't spare any probe ends $10 John Griessen [Non-text portions of this message have been removed] |
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Re: 8673G
Hi,
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thanks for the link but I already have to 8673B manuals. I'm specially looking for the 8673G manuals only. regards, Rainer Had schrieb:
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VHF/UHF/SHF Online Toplist: DF6NA Homepage: Amateurfunk-Flohmarkt: VHF-DX.net: |
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Re: FS: HP8568b 1.5 Ghz Spectrum Analyzer with HP8444a Opt. 59 Tracking Generator
Hello Jose,
This seemed extremely interesting to me, as I have a (I guess) lessThe 8444A opt.058 is almost the same as the opt. 059. Only, the output filter cuts earlier - nominally at 1.3 GHz. In effect it is very useable up to 1.5 GHz; the opt. 059 goes at least up to 1.6 GHz. Very little difference :-) Good for any SA with 2.050 GHz 1st IF, of course. 73 - Marco IK1ODO |
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Re: FS: HP8568b 1.5 Ghz Spectrum Analyzer with HP8444a Opt. 59 Tracking Generator
John Miles
Actually the same TG won't work with an 8566, not without some tinkering.
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The first IF is 3.621 GHz in those, rather than 2 GHz as in the 8568 and earlier models. That's not to say it couldn't be done, but you will need a new LO if nothing else. -- john, KE5FX -----Original Message----- |
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Re: FS: HP8568b 1.5 Ghz Spectrum Analyzer with HP8444a Opt. 59 Tracking Generator
Jose ,
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You can use it with your 8566a, I use it with my 8568A. It will only work for the low band for you but it is still useful. Its not good for RBW<10kHz but ok. You might try replacing the free running 500MHz oscillator with a crystal locked one for smaller RBWs. Tim
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John Sykes
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