Re: HP 8642B develops issues when warming up
I should add the problems didn't occur right after powering on the generator, it was a over a period of an hour or more in which the incident finally started to occur. I have used this generator numerous times but not as long in duration and note no issues of any kind other than that moment of extended usage time.
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Re: HP 8642B develops issues when warming up
I tried to duplicate the problem that occurred before. Run the generator at -70dB connected to a receiver with a audio source feeding the FM input with the deviation set to 150 kHz. I probed the test points on the regulator board to see if the +50 +15 -15 +5.2 -5.2 volt were there and steady and they were. After I ran the test for a while I did not run into the issue that occurred before so I checked the regulator voltages and they were fine. I checked for proper voltages and stability which I seen no issues. I will try to repeat this test later and see if the symptoms will occur.
As of the moment this generator works fine, frequency, amplitude, and various functions work as expected. Running the self test in the service mode brings up a failed test on A4 which I replaced that board but it still fails and rarely a19 fails a test yet the usability of the generator seems unaffected.
I realize I made a typo previously on this post. I indicated before A16 which is the attenuator for the 8642A however I have the 8642B, I meant to say A6, I apologize about that. This is the time base module. I recall before when I had the receiver connected to the output of the generator there would be brief occasional? break ups in the signal but it would come back, I finally and briefly got a flashing message stating A6 transient failure but that went away, and A19 was failing a test at that very same time. I turned everything off but did not unplug, after letting it set a while and turning back on everything worked fine.
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Re: Missing button cover on HP network analyzer.
>Yeah, it's the same PN. I've been following ebay for the past year and none popped up.
The cover changed starting with the 8753C model (color display).
Vladan
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Re: Missing button cover on HP network analyzer.
That's a great find!
I don't need the entire frame, just the button cover, so I'll
print the second one.
I'll post pictures when it's done.
Thanks!
On 2018-10-15 1:35 AM, Roger Henderson
wrote:
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Show quoted text
I designed this very basic one for my HP 8753
Also I found this one. It is just the button cover and
looks much better than mine:
On Thu, 11 Oct 2018 at 14:48, Razvan < razvan@...>
wrote:
Hey guys,
I'm missing the button cover on my HP 8752C. I know I'm not
the only one
with this issue and I know they're close to impossible to
find.
Is anyone willing to measure it and take some photos from
above, side,
etc, so I can model it in a 3D program? I would then share the
design
and everyone missing it, can print it.
Perhaps a volunteer with two network analyzers, one with a
missing
button cover?
Razvan
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Re: Missing button cover on HP network analyzer.
On 2018-10-15 1:16 AM, Dr. David Kirkby from Kirkby Microwave Ltd wrote: Your could try asking on /g/Test-Equipment-For-Sale-Wanted-or-Exchange/ to see if anyone has one to see - you might even get it free! I suspect that the same button iis used on various bits of test equipment. It looks llike the same as used on the 8753, 8720_ 4291B. Yeah, it's the same PN. I've been following ebay for the past year and none popped up.
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Off-topic question re. oddball coax plug
What is a coax plug that is essentially identical to an SMB male plug except it is bigger in diameter? The OD of the male plug is 0.245" or 6.2mm.
It has the same groove on the outside sleeve as an SMB, the same teflon liner just inside that, and a small diameter round pin in the center. There are no threads. I received some of these along with some Agilent equipment, but I don't think there is any connection.
Thanks!
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Re: Missing button cover on HP network analyzer.
I certainly need a button cover for my 8753C. If anyone decides to print and sell these, please let me know.
By the way — is button spacing the same on all versions of the VNA? (For some reason that I no longer recall, I thought that the vertical spacing between my buttons was narrower than another 8753 that I saw. But I could be wrong.)
Thanks,
- Jeff
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Re: Missing button cover on HP network analyzer.
… now I remember…? those always break.?
Pete
On Sun, Oct 14, 2018, 6:35 PM Roger Henderson < hendorog@...> wrote: I designed this very basic one for my HP 8753
Also I found this one. It is just the button cover and looks much better than mine:
On Thu, 11 Oct 2018 at 14:48, Razvan < razvan@...> wrote: Hey guys,
I'm missing the button cover on my HP 8752C. I know I'm not the only one
with this issue and I know they're close to impossible to find.
Is anyone willing to measure it and take some photos from above, side,
etc, so I can model it in a 3D program? I would then share the design
and everyone missing it, can print it.
Perhaps a volunteer with two network analyzers, one with a missing
button cover?
Razvan
|
Re: Missing button cover on HP network analyzer.
I designed this very basic one for my HP 8753
Also I found this one. It is just the button cover and looks much better than mine:
On Thu, 11 Oct 2018 at 14:48, Razvan < razvan@...> wrote: Hey guys,
I'm missing the button cover on my HP 8752C. I know I'm not the only one
with this issue and I know they're close to impossible to find.
Is anyone willing to measure it and take some photos from above, side,
etc, so I can model it in a 3D program? I would then share the design
and everyone missing it, can print it.
Perhaps a volunteer with two network analyzers, one with a missing
button cover?
Razvan
|
I don't have it but if I remember at is like using it like an x/y display
Hello,
I am looking for the product note? 8970B/S-4, "Displaying HP 8970B Noise Figure Meter Measurements on the HP 8757 Scalar Network Analyzer,"? pn 5959-8742..Thank you.
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Re: Missing button cover on HP network analyzer.
I did not see the 1st email… buttons for what??
Pete wa2odo
On Sun, Oct 14, 2018, 6:16 PM Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...> wrote: Your could try asking on /g/Test-Equipment-For-Sale-Wanted-or-Exchange/ to see if anyone has one to see - you might even get it free! I suspect that the same button iis used on various bits of test equipment. It looks llike the same as used on the 8753, 8720_ 4291B.
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Re: Missing button cover on HP network analyzer.
Dr. David Kirkby from Kirkby Microwave Ltd
Your could try asking on /g/Test-Equipment-For-Sale-Wanted-or-Exchange/ to see if anyone has one to see - you might even get it free! I suspect that the same button iis used on various bits of test equipment. It looks llike the same as used on the 8753, 8720_ 4291B.
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I have an HP853A Spectrum Analyzer display with the 8559A plugin. The display and plugin controls seem to work but it is not displaying a signal regardless of the setting. I tried an external signal as well the cal input. Can anyone offer any trouble shooting tips short of trying another plugin?
Thanks,
Mike N2MS
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Re: [OT] - Bird 4391M Data connector information
Yes, Bird made 2 conversion boxes for th 4391 power analysts,? a 4380-488 and a 4380-232.? They were about the same size as the 4391 and sat under the 4391, attached with a short cable.? one box did the conversion to ieee-488, the other to rs-232.
Links to the manuals are here:
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Re: [OT] - Bird 4391M Data connector information
Ok, Bird engineer courteously answered, M is the military version and the connector's function is meant to connect with either IEEE-488 or RS232 boxes.
So, it is not a serial port, needs (some) massaging to get proper data.
Giuseppe Marullo
IW2JWW - JN45RQ
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Show quoted text
On 10/6/2018 5:00 PM, Giuseppe Marullo wrote: Hello,
sorry for the OT. I have purchased a old rf watt meter (still sold by
Bird AFAIK) but any pointer leads me to 4391A models, M is simply
unknown. The M version has a connector on its back panel, it should be
a serial connection (somewhat DA-15 ITT Cannon, the item is not in my
hands yet) but really I am at loss to find anything about it.
I asked Bird directly but there is nothing on their site about this
version/option.
Any help is appreciated, thanks in advance.
Giuseppe Marullo
IW2JWW - JN45RQ
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Re: HP8560A power supply repair
I had the same issue on an HP 8562A. Replaced mine with an electrolytic I had lying around and haven't had issues since.
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Show quoted text
On 2018-10-13 3:06 AM, Dieter Teuchert wrote: Today i fixed a problem in the 28 V line of our HP 8560A. The culprit was a dry elko in the voltage doubler, marked with polarity, 180 uF, 40 V. An interesting part, since it has three pins. Apparently the third pins connects the aluminum cup to Gnd to be a shield. What is the name of this part?
Forty years ago i learned that this capacitor in a voltage doubler needs to be of bipolar type in order to last, so i put in a 100uF 50 bipolar that i had and a 100 nF foil parallel. Also added a shield (copper foil).
My first repair of that machine went well, roughly four hours. I used the service manual and discharged the tube as recommended before taking out the power supply board.
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HP8560A power supply repair
Today i fixed a problem in the 28 V line of our HP 8560A. The culprit was a dry elko in the voltage doubler, marked with polarity, 180 uF, 40 V. An interesting part, since it has three pins. Apparently the third pins connects the aluminum cup to Gnd to be a shield. What is the name of this part?
Forty years ago i learned that this capacitor in a voltage doubler needs to be of bipolar type in order to last, so i put in a 100uF 50 bipolar that i had and a 100 nF foil parallel. Also added a shield (copper foil).
My first repair of that machine went well, roughly four hours. I used the service manual and discharged the tube as recommended before taking out the power supply board.
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Re: Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe?
You don’t loop the IF out back into RF – you could use IF out on the second section when in zero span mode to an SDR like a down convertor. ? That way you get real time display of something up higher in the band than the SDR would normally go. ?
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Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of bownes
Sent: Saturday, 13 October 2018 10:28 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe?? You can chain multiple IFs. I have two in one of my SAs and the 70900 is smart enough to select the appropriate one. There are inputs and outputs for the 21.something IF signal.? But I don’t think you can loop the IF through the RF section, it only has LO in and IF out.
On Oct 12, 2018, at 19:08, Noel VK3NH <noelmh@...> wrote:
David, ? Programming considerations (MODULE CONFIGURATION) ? See 400 and 401 at ? The HP 70900 (A or B) local oscillator is the controlling device in the MMS address systems. ?Configuration wise I not sure you can “slave” multiple IF and RF sections to the same LO.? Creating two groups and switching it between them is not practical as the address can only be changed by removing the LO from the mainframe and resetting the DIP switches. ? By the way there is some really good information about modules/components of the system, block diagrams and their operations e.g. Page 344. ? HARDWARE considerations (assuming you can MAP/slave two RF/IF combinations to one LO.) ? See page 1-3 in ? If you have only one LO and you want to control two separate analysers then you need use the two 300MHz ports to supply that signal to both RF frontends and switch the following ? 1/ the LO output between the RF front ends 2/ the tune span control between two RF front ends 3/ the video out from the IF(s) in use back into the LO section for processing. ? To minimise the space used, you might consider just using use the 10Hz to 300kHz IF with the 2.9GHz frontend as sweep speed is reasonable. ? Have fun! ? Regards Noel ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Dr. David Kirkby from Kirkby Microwave Ltd
Sent: Saturday, 13 October 2018 5:27 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe? ? ? On Fri, 12 Oct 2018, 18:38 bownes, <bownes@...> wrote: You have to have an IF section. There are several choices.?
But the mainframe I bought from eBay has a 70902A IF unit, and I already have a couple of IF units on the 22 GHz front end. So perhaps something like 1) Remove a partially working power? sensor to free up a slot, giving me four free slots. 2) Split or switch output of local oscillator 3) Add in the 2.9 GHz RF section,??70902A IF unit, 2.9 GHz preamp and preselector. I only have one preselector, so have no idea if that could be used with both RF units or just one. I could suffer just one.? I assume an address of a?70902A would need changing, as I would have two identical modules.? Does that sound workable??
On Oct 12, 2018, at 13:34, Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> wrote:
On Fri, 12 Oct 2018 at 18:15, pianovt via Groups.Io <pianovt=[email protected]> wrote: The 21.4 MHz output from a front end module goes to the input of the IF module. The IF module has no provision for two inputs. How would you connect the two front end outputs to one IF module? You would have to reconnect those cables on the back of the system. I don't know what your application is, but keep in mind that the noise performance of the system is degraded at the low frequency end.
Vladan
? I was not aware about the noise. I can't go into the application unfortnately. The unit I bought does have an 10 Hz to 300 kHz IF section, so could add an IF module. From page 11 of the note someone posted,
it looks like this may be doable if the LO is amplified and split. I could consider a simple switch, or might just get away with a splitter, at some degraduable in performance. It would mean pulling out one of my power sensors, but since one does not zero well, and I have a decent power meter, that is no big deal. I can live with that. Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
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Re: Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe?
You would still need to swap the LO between chassis. Much easier to just
swap the RF sections each time in one chassis.
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Show quoted text
-----Original Message----- From: [email protected][mailto: [email protected]] On Behalf Of Scott McGrath Sent: Friday, 12 October 2018 8:57 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe? Once again it depends but generally you can have ONE spectrum analyzer per 70900, Since you have multiple chassis id suggest setting up the desired modules in each chassis and use the display module on each chassis as required. You could even connect all 3 chassis together by adding an additional 37 pin connector cable from j2 on the second chassis to j1 on the third and j2 on chassis 3 to j1 on chassis 1 as the MSIB is circular. Content by Scott Typos by Siri
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Re: Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe?
You can chain multiple IFs. I have two in one of my SAs and the 70900 is smart enough to select the appropriate one. There are inputs and outputs for the 21.something IF signal.?
But I don’t think you can loop the IF through the RF section, it only has LO in and IF out.
Bob
toggle quoted message
Show quoted text
On Oct 12, 2018, at 19:08, Noel VK3NH < noelmh@...> wrote: David, ? Programming considerations (MODULE CONFIGURATION) ? See 400 and 401 at ? The HP 70900 (A or B) local oscillator is the controlling device in the MMS address systems. ?Configuration wise I not sure you can “slave” multiple IF and RF sections to the same LO.? Creating two groups and switching it between them is not practical as the address can only be changed by removing the LO from the mainframe and resetting the DIP switches. ? By the way there is some really good information about modules/components of the system, block diagrams and their operations e.g. Page 344. ? HARDWARE considerations (assuming you can MAP/slave two RF/IF combinations to one LO.) ? See page 1-3 in ? If you have only one LO and you want to control two separate analysers then you need use the two 300MHz ports to supply that signal to both RF frontends and switch the following ? 1/ the LO output between the RF front ends 2/ the tune span control between two RF front ends 3/ the video out from the IF(s) in use back into the LO section for processing. ? To minimise the space used, you might consider just using use the 10Hz to 300kHz IF with the 2.9GHz frontend as sweep speed is reasonable. ? Have fun! ? Regards Noel ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Dr. David Kirkby from Kirkby Microwave Ltd
Sent: Saturday, 13 October 2018 5:27 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Can I set up a 2.9 GHz (70904A) and 22 GHz (70905A) spectrum analyzer in 70004A display and 70001A mainframe? ? ? On Fri, 12 Oct 2018, 18:38 bownes, <bownes@...> wrote: You have to have an IF section. There are several choices.?
But the mainframe I bought from eBay has a 70902A IF unit, and I already have a couple of IF units on the 22 GHz front end. So perhaps something like 1) Remove a partially working power? sensor to free up a slot, giving me four free slots. 2) Split or switch output of local oscillator 3) Add in the 2.9 GHz RF section,??70902A IF unit, 2.9 GHz preamp and preselector. I only have one preselector, so have no idea if that could be used with both RF units or just one. I could suffer just one.? I assume an address of a?70902A would need changing, as I would have two identical modules.? Does that sound workable??
On Oct 12, 2018, at 13:34, Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> wrote:
On Fri, 12 Oct 2018 at 18:15, pianovt via Groups.Io <pianovt=[email protected]> wrote: The 21.4 MHz output from a front end module goes to the input of the IF module. The IF module has no provision for two inputs. How would you connect the two front end outputs to one IF module? You would have to reconnect those cables on the back of the system. I don't know what your application is, but keep in mind that the noise performance of the system is degraded at the low frequency end.
Vladan
? I was not aware about the noise. I can't go into the application unfortnately. The unit I bought does have an 10 Hz to 300 kHz IF section, so could add an IF module. From page 11 of the note someone posted,
it looks like this may be doable if the LO is amplified and split. I could consider a simple switch, or might just get away with a splitter, at some degraduable in performance. It would mean pulling out one of my power sensors, but since one does not zero well, and I have a decent power meter, that is no big deal. I can live with that. Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
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Noel VK3NH
bownes