Re: HP 83592B hangs 8350B sweeper
I think A vs B means like an X-Y Plotter. You probably connect a Sweep Output Ramp to “B” and then some other Test Point to “A”. Rgds Bill Lauchlan ?
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From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Saturday, October 17, 2015 7:48 PM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] HP 83592B hangs 8350B sweeper? ? Has anyone done a calibration on one of these plug-ins? Step 20 in adjustments: What does A vs B mode on an oscilloscope mean? I think HP means trigger on B and look at A ??(A + B or A – B will not work. The waveforms are completely different time/div and shapes) A6-TP8 does not have positive sweeps as shown. They go negative from 0 to -10v. Step 22: A6R37 will not affect TP8 an far as I can see. Am I missing something? ? ? ? GREAT PROGRESS! Thanks Steve, you are quite correct. My A7 board is marked 83595 and works in this 83592 plug-in. However I suspected that the A6 board that was causing all the trouble was actually from an 83595 not an 83592. I removed the 4L and 4H pots, installed the R63 pot, moved the Band jumper, ?and concentrated on the Sweep Control and Bandswitch circuits. The A3 SW1 forces the signals to go through the variable gain amplifier for troubleshooting. Using this setting I could sweep band 0 but was finding that the TP7 signal was going positive by 2.4 volts. It should start at 0v and go negative to -10v max. There was an offset in the variable gain amplifier! I had also noticed that the gain seemed high. The schematics showed the gain resistors to be the same as the ones on the bad A6 board but they were different from the ones on the good A6 board. The parts list agreed with the resistors on the good A6 board so I assumed them to be correct. This was not the first error on the schematics I had found. Troubleshooting: Set sweep from 1 MHz to 1.1 MHz so TP5 is essentially at 0v. Check TP1 (BandSw DAC O/P) is 1.195v on good A6 and 1.194 on bad A6. So far so good. Check U5-6 is -10.05v on good A6 but is? -12.73v on bad board. TP7 is 0v on the good A6 but is +2.4v on the bad board. Conclusion: the gain is too high and is tripping U14 in the Bandswitch Comparator. Change all 4 gain resistors: R29???????? B0?????????? was 109.73k??????? change to 82.541k (TP7 is now 0v with the above test) R27???????? B1?????????? was 57.014k??????? change to 42.884k R25???????? B2?????????? was 40.423k??????? change to 30.423k R23???????? B3????????? was 40.423k??????? change to 30.423k Now the plug-in sweeps from 0.01 to 20 GHz and the INSTR PRESET no longer hangs the 8350B. Conclusion: The A6 board was from an HP 83595. I can now proceed with the calibration bu expect some problems because the resistors I used were 1%, not 0.1%, and are not the exact values. I may not have enough range of adjustment. I may also run into problems in the SRD and PIN diode bias circuits because of component values. Some of the analog switches are normally closed (PMI SW06) but are shown open on the schematic. U2A pins 1 & 2 are switched, U2A-2 goes to U13-11. Peter. ? ? ? ? I have an 83594A and an 83595A wth boards that have mismatched part numbers so it may not have been anything nefarious but if so its contagious! There are a couple of boards that don't match any of the manuals I've been able to find, and there are switches that open parts of loops, and pots for adjustments, and none are mentioned in any manual. The "joys" of working on older gear!
Steve ? Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model? My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x. ? I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board. ? On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in? I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in. ? I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc. ? ?
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Re: HP 83592B hangs 8350B sweeper
Has anyone done a calibration on one of these plug-ins? Step 20 in adjustments: What does A vs B mode on an oscilloscope mean? I think HP means trigger on B and look at A ??(A + B or A – B will not work. The waveforms are completely different time/div and shapes) A6-TP8 does not have positive sweeps as shown. They go negative from 0 to -10v. Step 22: A6R37 will not affect TP8 an far as I can see. Am I missing something? ?
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From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: October-17-15 5:54 PM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] HP 83592B hangs 8350B sweeper? ? GREAT PROGRESS! Thanks Steve, you are quite correct. My A7 board is marked 83595 and works in this 83592 plug-in. However I suspected that the A6 board that was causing all the trouble was actually from an 83595 not an 83592. I removed the 4L and 4H pots, installed the R63 pot, moved the Band jumper, ?and concentrated on the Sweep Control and Bandswitch circuits. The A3 SW1 forces the signals to go through the variable gain amplifier for troubleshooting. Using this setting I could sweep band 0 but was finding that the TP7 signal was going positive by 2.4 volts. It should start at 0v and go negative to -10v max. There was an offset in the variable gain amplifier! I had also noticed that the gain seemed high. The schematics showed the gain resistors to be the same as the ones on the bad A6 board but they were different from the ones on the good A6 board. The parts list agreed with the resistors on the good A6 board so I assumed them to be correct. This was not the first error on the schematics I had found. Troubleshooting: Set sweep from 1 MHz to 1.1 MHz so TP5 is essentially at 0v. Check TP1 (BandSw DAC O/P) is 1.195v on good A6 and 1.194 on bad A6. So far so good. Check U5-6 is -10.05v on good A6 but is? -12.73v on bad board. TP7 is 0v on the good A6 but is +2.4v on the bad board. Conclusion: the gain is too high and is tripping U14 in the Bandswitch Comparator. Change all 4 gain resistors: R29???????? B0?????????? was 109.73k??????? change to 82.541k (TP7 is now 0v with the above test) R27???????? B1?????????? was 57.014k??????? change to 42.884k R25???????? B2?????????? was 40.423k??????? change to 30.423k R23???????? B3????????? was 40.423k??????? change to 30.423k Now the plug-in sweeps from 0.01 to 20 GHz and the INSTR PRESET no longer hangs the 8350B. Conclusion: The A6 board was from an HP 83595. I can now proceed with the calibration bu expect some problems because the resistors I used were 1%, not 0.1%, and are not the exact values. I may not have enough range of adjustment. I may also run into problems in the SRD and PIN diode bias circuits because of component values. Some of the analog switches are normally closed (PMI SW06) but are shown open on the schematic. U2A pins 1 & 2 are switched, U2A-2 goes to U13-11. Peter. ? ? ? ? I have an 83594A and an 83595A wth boards that have mismatched part numbers so it may not have been anything nefarious but if so its contagious! There are a couple of boards that don't match any of the manuals I've been able to find, and there are switches that open parts of loops, and pots for adjustments, and none are mentioned in any manual. The "joys" of working on older gear!
Steve ? Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model? My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x. ? I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board. ? On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in? I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in. ? I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc. ? ?
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Re: HP 83592B hangs 8350B sweeper
GREAT PROGRESS! Thanks Steve, you are quite correct. My A7 board is marked 83595 and works in this 83592 plug-in. However I suspected that the A6 board that was causing all the trouble was actually from an 83595 not an 83592. I removed the 4L and 4H pots, installed the R63 pot, moved the Band jumper, ?and concentrated on the Sweep Control and Bandswitch circuits. The A3 SW1 forces the signals to go through the variable gain amplifier for troubleshooting. Using this setting I could sweep band 0 but was finding that the TP7 signal was going positive by 2.4 volts. It should start at 0v and go negative to -10v max. There was an offset in the variable gain amplifier! I had also noticed that the gain seemed high. The schematics showed the gain resistors to be the same as the ones on the bad A6 board but they were different from the ones on the good A6 board. The parts list agreed with the resistors on the good A6 board so I assumed them to be correct. This was not the first error on the schematics I had found. Troubleshooting: Set sweep from 1 MHz to 1.1 MHz so TP5 is essentially at 0v. Check TP1 (BandSw DAC O/P) is 1.195v on good A6 and 1.194 on bad A6. So far so good. Check U5-6 is -10.05v on good A6 but is? -12.73v on bad board. TP7 is 0v on the good A6 but is +2.4v on the bad board. Conclusion: the gain is too high and is tripping U14 in the Bandswitch Comparator. Change all 4 gain resistors: R29???????? B0?????????? was 109.73k??????? change to 82.541k (TP7 is now 0v with the above test) R27???????? B1?????????? was 57.014k??????? change to 42.884k R25???????? B2?????????? was 40.423k??????? change to 30.423k R23???????? B3????????? was 40.423k??????? change to 30.423k Now the plug-in sweeps from 0.01 to 20 GHz and the INSTR PRESET no longer hangs the 8350B. Conclusion: The A6 board was from an HP 83595. I can now proceed with the calibration bu expect some problems because the resistors I used were 1%, not 0.1%, and are not the exact values. I may not have enough range of adjustment. I may also run into problems in the SRD and PIN diode bias circuits because of component values. Some of the analog switches are normally closed (PMI SW06) but are shown open on the schematic. U2A pins 1 & 2 are switched, U2A-2 goes to U13-11. Peter. ? ?
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From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: October-16-15 12:10 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] HP 83592B hangs 8350B sweeper? ? I have an 83594A and an 83595A wth boards that have mismatched part numbers so it may not have been anything nefarious but if so its contagious! There are a couple of boards that don't match any of the manuals I've been able to find, and there are switches that open parts of loops, and pots for adjustments, and none are mentioned in any manual. The "joys" of working on older gear!
Steve ? Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model? My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x. ? I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board. ? On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in? I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in. ? I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc. ? ?
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Re: off topic old tube tester
I don't have anything that would help, but there is a Yahoo forum
named "TubeTesters" where you might find some help.
DaveD
On 10/16/2015 11:09 PM, Ken Chalfant
kpchalfant@... [hp_agilent_equipment] wrote:
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?
Greetings,
Kindly allow me to ask for assistance regarding a very
loosely related question. I just acquired a 57 year old
Shell Test-O-Matic tube tester for a young friend who
restores old trucks and is learning how to repair and
rebuild the original AM radios.
The tube tester has a lid mounted “set-up” chart dated
June 1958, mostly in legible condition.
Does anyone have additional or supplemental tube test
charts for this generation of Test-O-Matic tube tester you
are willing to share, copy, or sell?
Thanks very much for your time and bandwidth.
Regards,
Ken
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Re: off topic old tube tester
Hey Ken,
I have a "U-Test-M" that I restored a while back.? It's documented . I'm not sure how similar it is or if the chart could be used.? I can take some pictures of my chart and see if it aligns with the Test-O-Matic.
Gary
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off topic old tube tester
Greetings,
Kindly allow me to ask for assistance regarding a very loosely related question. I just acquired a 57 year old Shell Test-O-Matic tube tester for a young friend who restores old trucks and is learning how to repair and rebuild the original AM radios.
The tube tester has a lid mounted “set-up” chart dated June 1958, mostly in legible condition.
Does anyone have additional or supplemental tube test charts for this generation of Test-O-Matic tube tester you are willing to share, copy, or sell?
Thanks very much for your time and bandwidth.
Regards,
Ken
|
I had the same problem a while back - the adapters cost more than whole scope, and I couldn't test to see if it was any good without putting in a proper input signal. I asked here, and someone steered me to a lady that was selling all kinds of microwave cables on ebay. As I recall, I found some short jumper cables there that had 2.4 mm on one end, and SMA (or maybe 2.92 - SMA compatible) on the other, for about $15 each. It was not quite the same as having the precision barrel adapters, but good enough for my needs, at much lower cost. The cheapest barrel types I found at the time were about $100 each.
Just keep asking here - someone knew the right place to go (if still there) - or search the archives for 70820A, and maybe that thread will show up. It's rare enough that there shouldn't be much chaff to sort out. It would have been from about two or three years ago, I think.
Ed
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Thanks guys for the various replies.
I'm was almost sure these are 2.4mm connectors (and not 2.92) because the HP literature for the 70820A refers to needing APC-2.4mm adaptors, plus they don't look like they will mate with SMA connectors (I didn't want to "force" one in and wreck it, so I'm not totally sure!). I browsed all the 70820A literature I could find, but didn't spot a definitive statement of what the front panel connectors were (perhaps there are options, I don't know).
Perhaps as Dave Kirby suggests, I'll try making a low offer on a couple of adaptors to SMA, and see if I get anywhere.
Steve G4KNZ.
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Dave,
You may already know the history of the NMD, but for those that don't, the NMD connector (Network Measurements Division) was HP's solution to stabilize test port cables on various test sets. With good test port cables, NMD test port connectors, and the anti-rotation clamps (08515-60003 if memory serves me) you can get pretty consistent results. I agree with you that NMD will properly mate with standard connectors but I've seen the results of standard connectors screwed into test ports and without extreme care (which I take for granted everyone exercises with precision connectors, right :0)) the results are usually pretty poor repeatability over a series of measurements and possibly a telltale dip in response at higher frequencies. I didn't intend my answer to mean it couldn't be done, just that there are risks and the NMD was designed to help minimize them. For that you usually pay a premium.
Steve
WB0DBS
?
On 10/16/2015 03:51 PM, Steve Steve-Krull@... [hp_agilent_equipment]
wrote:
> The NMD is a special test port connector, not a standard connector. Have
> a look at the Maury website for pictures. You might be able to fit a
> standard connector to a test port but I wouldn't guarantee the accuracy
> or reliability of the results. I agree 500 USD per NMD connector is a
> big chunk of money; and cable sets are really pricy. You might be able
> to find a pair of connectors at a more reasonable price but you'll find
> that precision connectors demand a higher price. Even if you stop at
> 26.5G you're still faced with getting from the NMD test ports to 3.5mm
> or SMA. I recently passed on a 70820A on eBay for exactly that reason.
> Beware the cheap inter-series adapters if you're after any sort of
> repeatability and reliability.
The NMD connectors are "supersets" of standard connectors, like 3.5mm,
2.4mm, etc. They are designed to be entirely compatible with them, and
are very frequently used in that environment.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
I had forgotten, yes, they are 2.4mm. The rest of my post still stands. You cannot interconnect SMA with them, you need an adapter. I went through this when I had to replace the (missing) 2.4mm NDM's on my 70820.
?
On 10/16/15 08:44 PM, Bob Bownes bownes@... [hp_agilent_equipment] wrote:
> They are 2.92mm. The easiest thing to get is 2.92mm to SMA adapters, but
> they are quite pricey at about $100 each.
>
> You can order 2.92mm to *.* test port cables, but, again, expect to pay
> quite a bit. Sometimes you see them on ebay for about $250-$300 each for
> 2.92mm to N or SMA.
I don't know what connectors these, as I don't have one, but I was lead to
believe by someone else they are 2.4 mm. If 2.4 mm as the author states, then
they will not mate to SMA. But if 2.92 mm they will mate to SMA. But of course
they wont have the performance. Also 2.92 mm is very fragile - much more so than
2.4 or 3.5 mm.
One of my VNAs has 3.5 mm NMD connectors on it. I managed to pick up a pair of
adapters to N for about $150, and much the same for adapters to 3.5 mm. I do
also have the proper test port cables, but they are serious money.
Sure you see NMD adapters on eBay for stupid money, but it is not hard to buy
them at a lot less. Many of the people asking $500 will probably take $100-$200
for them if you ask.
Dave
>
>
>
> On Fri, Oct 16, 2015 at 3:14 PM, steve@...
> [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
>
>>
>> I just got hold of a 70820A microwave transition analyzer, and need either
>> cables or adaptors for the two RF ports. As I understand it, these are
>> APC-2.4 connectors, also known as NMD 2.4mm? Is that correct, two names for
>> the same connector, or is there some difference?
>>
>>
>> I just tried to find some adaptors, a quick look on ePay, one adaptor is
>> coming up at around $500 US, so I'd be spending more on the adaptors than I
>> paid for the whole unit. Anyone know of a more affordable source? I really
>> only want to go up to 26.5GHz, and don't really care about the perfomance
>> any higher.
>>
>>
>>
--
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK.
Registered in England and Wales, company number 08914892.
Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)
[Non-text portions of this message have been removed]
|
The 70820A uses male 2.4 mm connectors.? I don't think I've seen any with 2.92. ? For interfacing with 3.5mm or (good-quality) SMA M-M cables, I use A350F240F adapters from "rfextra" on eBay.? These were sold for a while at http://cgi.ebay.com/160715492551 for "only" $100 each, but it looks like they're out of stock at the moment. ? -- john, KE5FX ? ?
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From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Friday, October 16, 2015 12:45 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] HP 70820A connectors? ? They are 2.92mm. The easiest thing to get is 2.92mm to SMA adapters, but they are quite pricey at about $100 each. You can order 2.92mm to *.* test port cables, but, again, expect to pay quite a bit. Sometimes you see them on ebay for about $250-$300 each for 2.92mm to N or SMA.
|
Dr. David Kirkby - Kirkby Microwave Ltd
On 10/16/15 08:44 PM, Bob Bownes bownes@... [hp_agilent_equipment] wrote: They are 2.92mm. The easiest thing to get is 2.92mm to SMA adapters, but
they are quite pricey at about $100 each.
You can order 2.92mm to *.* test port cables, but, again, expect to pay
quite a bit. Sometimes you see them on ebay for about $250-$300 each for
2.92mm to N or SMA. I don't know what connectors these, as I don't have one, but I was lead to believe by someone else they are 2.4 mm. If 2.4 mm as the author states, then they will not mate to SMA. But if 2.92 mm they will mate to SMA. But of course they wont have the performance. Also 2.92 mm is very fragile - much more so than 2.4 or 3.5 mm. One of my VNAs has 3.5 mm NMD connectors on it. I managed to pick up a pair of adapters to N for about $150, and much the same for adapters to 3.5 mm. I do also have the proper test port cables, but they are serious money. Sure you see NMD adapters on eBay for stupid money, but it is not hard to buy them at a lot less. Many of the people asking $500 will probably take $100-$200 for them if you ask. Dave
On Fri, Oct 16, 2015 at 3:14 PM, steve@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
I just got hold of a 70820A microwave transition analyzer, and need either
cables or adaptors for the two RF ports. As I understand it, these are
APC-2.4 connectors, also known as NMD 2.4mm? Is that correct, two names for
the same connector, or is there some difference?
I just tried to find some adaptors, a quick look on ePay, one adaptor is
coming up at around $500 US, so I'd be spending more on the adaptors than I
paid for the whole unit. Anyone know of a more affordable source? I really
only want to go up to 26.5GHz, and don't really care about the perfomance
any higher.
-- Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)
|
On 10/16/2015 03:51 PM, Steve Steve-Krull@... [hp_agilent_equipment] wrote: The NMD is a special test port connector, not a standard connector. Have
a look at the Maury website for pictures. You might be able to fit a
standard connector to a test port but I wouldn't guarantee the accuracy
or reliability of the results. I agree 500 USD per NMD connector is a
big chunk of money; and cable sets are really pricy. You might be able
to find a pair of connectors at a more reasonable price but you'll find
that precision connectors demand a higher price. Even if you stop at
26.5G you're still faced with getting from the NMD test ports to 3.5mm
or SMA. I recently passed on a 70820A on eBay for exactly that reason.
Beware the cheap inter-series adapters if you're after any sort of
repeatability and reliability. The NMD connectors are "supersets" of standard connectors, like 3.5mm, 2.4mm, etc. They are designed to be entirely compatible with them, and are very frequently used in that environment. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Steve,
The NMD is a special test port connector, not a standard connector. Have a look at the Maury website for pictures. You might be able to fit a standard connector to a test port but I wouldn't guarantee the accuracy or reliability of the results. I agree 500 USD per NMD connector is a big chunk of money; and cable sets are really pricy. You might be able to find a pair of connectors at a more reasonable price but you'll find that precision connectors demand a higher price. Even if you stop at 26.5G you're still faced with getting from the NMD test ports to 3.5mm or SMA. I recently passed on a 70820A on eBay for exactly that reason. Beware the cheap inter-series adapters if you're after any sort of repeatability and reliability. Steve K.
On Oct 16, 2015, at 2:14 PM, " steve@... [hp_agilent_equipment]" < hp_agilent_equipment@...> wrote:
?
I just got hold of a 70820A microwave transition analyzer, and need either cables or adaptors for the two RF ports. As I understand it, these are APC-2.4 connectors, also known as NMD 2.4mm? Is that correct, two names for the same connector, or is there some difference?
I just tried to find some adaptors, a quick look on ePay, one adaptor is coming up at around $500 US, so I'd be spending more on the adaptors than I paid for the whole unit. Anyone know of a more affordable source? I really only want to go up to 26.5GHz, and don't really care about the perfomance any higher.
|
They are 2.92mm. The easiest thing to get is 2.92mm to SMA adapters, but they are quite pricey at about $100 each.
You can order 2.92mm to *.* test port cables, but, again, expect to pay quite a bit. Sometimes you see them on ebay for about $250-$300 each for 2.92mm to N or SMA.
On Fri, Oct 16, 2015 at 3:14 PM, steve@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
?
I just got hold of a 70820A microwave transition analyzer, and need either cables or adaptors for the two RF ports. As I understand it, these are APC-2.4 connectors, also known as NMD 2.4mm? Is that correct, two names for the same connector, or is there some difference?
I just tried to find some adaptors, a quick look on ePay, one adaptor is coming up at around $500 US, so I'd be spending more on the adaptors than I paid for the whole unit. Anyone know of a more affordable source? I really only want to go up to 26.5GHz, and don't really care about the perfomance any higher.
|
I just got hold of a 70820A microwave transition analyzer, and need either cables or adaptors for the two RF ports. As I understand it, these are APC-2.4 connectors, also known as NMD 2.4mm? Is that correct, two names for the same connector, or is there some difference?
I just tried to find some adaptors, a quick look on ePay, one adaptor is coming up at around $500 US, so I'd be spending more on the adaptors than I paid for the whole unit. Anyone know of a more affordable source? I really only want to go up to 26.5GHz, and don't really care about the perfomance any higher.
|
Re: HP 83592B hangs 8350B sweeper
Peter,
I have an 83594A and an 83595A wth boards that have mismatched part numbers so it may not have been anything nefarious but if so its contagious! There are a couple of boards that don't match any of the manuals I've been able to find, and there are switches that open parts of loops, and pots for adjustments, and none are mentioned in any manual. The "joys" of working on older gear! Steve WB0DBS
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On Oct 16, 2015, at 10:47 AM, 'Peter' bunge@... [hp_agilent_equipment] < hp_agilent_equipment@...> wrote:
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Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model? My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x. ? I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board. ? On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in? I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in. ? I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc. ? ?
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Re: HP-8566B, HP-8566A used without display
John,
The display section is more that the CRT circuits; it's also the IF section. Along with the HPIB you'd need to capture the IF signals and do the processing in software. As you said, probably hellish to do, but an interesting project to think about!
I remember some of the ATE from decades ago in the USAF and yes, often the display was done away with. When it came to the metrology lab we had display sections available so we could do the calibration at first, and later I think the labs got ATE capability. I'm not sure how the developers did their magic but I suspect it was a similar method.? Steve WB0DBS
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On Oct 16, 2015, at 9:09 AM, John Griessen john@... [hp_agilent_equipment] < hp_agilent_equipment@...> wrote:
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On 10/15/2015 04:48 PM, sgm460122@... [hp_agilent_equipment] wrote:
> You might look into a TFT display replacement.
OK. I don't have an 8566B or a display for it. The question was, Does anyone use
the GPIB port to get SA sweeps and is it practical, or is there much other settings info
that would be missing and make it hellish to do?
I just read that some ATE users didn't buy the display. Did those ATE programmers
always have one with the display to develop on?
John
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Re: HP 83592B hangs 8350B sweeper
Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model? My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x. ? I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board. ? On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in? I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in. ? I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc. ? ?
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After the fly-back transformer blew I decided to try an LCD mod for this analyzer.? The A90 Display Board along with all the high-voltage circuits are no longer needed and removed.? It's been several weeks but I have a working version.? There's still an issue but I'm not sure if it can be resolved easily.? HP decided to use vertical line scans (the fast sync) instead of the normal horizontal scans for a normal monitor.? I can only surmise that HP wanted to keep from skewing the data by posting all the "Y" values for a given "X" as the "X" value increments with the graph origin located at the bottom left of the screen.? This is real time plotting so maybe there might be some noticeable distortion to the displayed data had they used a normal CRT scan.?? So now the slow scan becomes the horizontal scan on a typical monitor!? The result is that the display is rotated 90 degrees CW on a standard LCD monitor. I worked out a circuit to emulate an old-school XT color graphics adapter. The added benefit is that the two raster streams (full & half bright) can now be assigned any of the RGB color combinations.? The sync timings with the A60 Digital Display Driver oscillator (22.589 MHz) is too slow to fit an entire line scan on a modern LCD monitor.? I started modifying the display board with several oscillators to see what would happen.? The A60 board also has a selector for the slow sync of 60 Hz (power line frequency) or Free Sync which is tied to the on board oscillator which provides additional modes to test. I tried several oscillators and anything above 24 MHz causes too much jitter with the display and the monitor has a hard time synching with the signal.? I wanted to try a frequency in the 23 MHz range but didn't have a standard oscillator style like the original so I built an oscillator with some inverter gates (74LS04) and a 23.247 MHz crystal.? It's mounted on top of the board with a selector block to choose between the old and the new oscillator. This works fairly well but I would like to get a regular oscillator so I can close up the case. I've added some pictures in my "3561A Repair" photo folder.? I've included the final display results showing success at getting a complete raster display on the LCD monitor so at least it's usable again! Since I'm running at a faster frequency the skewing problem might not be an issue so the main question is - would it be possible to modify the way the pixels are mapped to memory so that it emulates a standard display?? I've got my 1650A Logic Analyzer working but don't have a clue where to start looking at bits and bytes.? There is some description in the manual for the A60 board and it appears that all the addressing is done on the A60 board:? "The byte address consists of two parts: a row address and a column address.? The column address is taken from the upper seven bits of the position address register, the row address is taken from the next seven bits.? The bottom three bits of the position address register are decoded to form the bit address bus (RAM selector)."? I'm thinking that the CPU is assigning the coordinates and the A60 board is converting it to a position address.? If that's the case then there is probably a ROM that needs to be modified (well above my capabilities).? If anyone has a clew HOW or IF re-addressing the pixels is possible please let me know. Gary
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bownes
Dave McGuire