Re: HP 8566A large amplitude error in 2-22GHz range
No problem - your display answered both questions - given that it is an 8341, the high band absence is expected.
If you're referring to the 20-22GHz range then yes, I agree.
I think the SA is probably fine and just needs adjustment. You can get a better display of the frequency response by setting the 8341 to sweep at 30 -50ms and setting the 8566A to sweep at 150 seconds. I think the unit is workable - what was the input level from the 8341 and do you believe it has relatively flat output?
Cool! I will try that out and post the results. Yes, I measured the output power of the 8341 with a calibrated power meter and it was within a dB or so across the full range.
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Re: HP 8566A large amplitude error in 2-22GHz range
No problem - your display answered both questions - given that it is an 8341, the high band absence is expected.
I think the SA is probably fine and just needs adjustment. You can get a better display of the frequency response by setting the 8341 to sweep at 30 -50ms and setting the 8566A to sweep at 150 seconds. I think the unit is workable - what was the input level from the 8341 and do you believe it has relatively flat output?
Quoting Siggi <siggi@...>:
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On Mon, Dec 7, 2020 at 4:55 PM <huszaghmatt@...> wrote:
This is with a frequency ramp signal from 2-20GHz at 0dBM using my 8341B.
That's what I thought was wanted. My noise signal looks identical to yours.
I think low band is ok, but happy to do a test if there's something you
want to see?
Ah, ok. I misunderstood, I thought you had no input.
In that case I think you should go hunt after the YTO unlock.
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Re: HP 8566A large amplitude error in 2-22GHz range
This is with a frequency ramp signal from 2-20GHz at 0dBM using my 8341B. That's what I thought was wanted. My noise signal looks identical to yours. I think low band is ok, but happy to do a test if there's something you want to see?
Ah, ok. I misunderstood, I thought you had no input.? In that case I think you should go hunt after the YTO unlock.
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Re: HP 8566A large amplitude error in 2-22GHz range
On Mon, Dec 7, 2020 at 1:44 PM Bruce < bruce@...> wrote: Incidentally, the CRT looks good on this SA - reasonably rare in used?
8566s today.
Not bad, but the IF is definitely sick...
The graticule lines aren't intersecting properly at their?ends and the image looks small.
I'd be checking the IF power supplies, but that YTO UNLOCK needs dealing with first.? I wouldn't adjust anything unless I knew the 10MHz reference was OK - a recent acquisition was seventy-odd Hz out and caused reference?unlocks when cold - I don't know if it could also cause a YTO unlock.
Orin.
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Re: HP 8566A large amplitude error in 2-22GHz range
Siggi, I tried this and saw only the noise floor (tried at 5GHz and 15GHz, same for each). This was surprising to me as it was working reasonably well at 5GHz and still showed a signal at 15. I increased the frequency span. When it was wide, the signal appeared clearly (still attenuated at 15). When I narrowed it it dropped in amplitude.
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I'll take it. PayPal to follow immediately.
C/C sent to you off-list.
Best,
Bill @ PEARL, Inc.>
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Price is $15.00. Since it is a catalog, I can't use Media Mail for shipping so shipping will be $10.00.
PayPal is OKdchallam@...
David C Hallam KW4DH
Clearwater, FL
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Re: HP 8566A large amplitude error in 2-22GHz range
Input is a ramp signal from 2-20GHz at 0dBM using my 8341B.
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Re: HP 8566A large amplitude error in 2-22GHz range
Siggi,
This is with a frequency ramp signal from 2-20GHz at 0dBM using my 8341B. That's what I thought was wanted. My noise signal looks identical to yours. I think low band is ok, but happy to do a test if there's something you want to see?
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Re: HP 8566A large amplitude error in 2-22GHz range
Note also that you can look at this in the time domain by using zero span. Just pick a center frequency, perhaps in the middle of one of the bands, and select 0Hz for span. This will then show you power over time at that frequency in the resolution bandwidth you've selected. By picking lower and lower resolution bandwidths, you should expect to see the trace drop down the screen. If the noise is e.g. 50/60Hz bleeding in from the power supplies, then you can look at it in the time domain by selecting line triggering for the zero span trace.
Here's what I get. Worth noting that the attenuation I see is not so consistent. I've seen worse than this before.
Attachments:
Is this with maxhold? For comparison, here's what I see on my 8566B with maxhold on the trace, no input. Note that the lower bound of your trace isn't far off the max noise level of my 8566B, but then it's as if you have something riding on top of that. Here's what it looks like without maxhold:
My 8566B had a random noise problem in the IF section that manifested in both bands (0-2.5GHz and the upper band). What does your low band look like?
Siggi
Attachments:
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Re: HP 8566A large amplitude error in 2-22GHz range
Incidentally, the CRT looks good on this SA - reasonably rare in used 8566s today.
Quoting Siggi <siggi@...>:
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Show quoted text
On Mon, Dec 7, 2020 at 3:37 PM <huszaghmatt@...> wrote:
Here's what I get. Worth noting that the attenuation I see is not so
consistent. I've seen worse than this before.
Attachments:
- IMG_0344.JPG
</g/HP-Agilent-Keysight-equipment/attachment/112108/>
Is this with maxhold? For comparison, here's what I see on my 8566B with maxhold on the trace, no input.
[image: image.png]
Note that the lower bound of your trace isn't far off the max noise level
of my 8566B, but then it's as if you have something riding on top of that.
Here's what it looks like without maxhold:
[image: image.png]
My 8566B had a random noise problem in the IF section that manifested in
both bands (0-2.5GHz and the upper band). What does your low band look like?
Siggi
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Re: HP 8566A large amplitude error in 2-22GHz range
So based on what I'm seeing, the YTO (and apparently ONLY the YTO) is unlocked. I'd look into doing an alignment, but the problem is you need a spectrum analyzer to do it properly.
The high band problem could be frequency response adjustment, but basically, the SA appears to be reasonably functional. What was the "input signal"
Cheers!
Bruce
Quoting Siggi <siggi@...>:
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On Mon, Dec 7, 2020 at 3:37 PM <huszaghmatt@...> wrote:
Here's what I get. Worth noting that the attenuation I see is not so
consistent. I've seen worse than this before.
Attachments:
- IMG_0344.JPG
</g/HP-Agilent-Keysight-equipment/attachment/112108/>
Is this with maxhold? For comparison, here's what I see on my 8566B with maxhold on the trace, no input.
[image: image.png]
Note that the lower bound of your trace isn't far off the max noise level
of my 8566B, but then it's as if you have something riding on top of that.
Here's what it looks like without maxhold:
[image: image.png]
My 8566B had a random noise problem in the IF section that manifested in
both bands (0-2.5GHz and the upper band). What does your low band look like?
Siggi
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Re: HP 8566A large amplitude error in 2-22GHz range
EB5AGV has a great write up of his ordeal with an 8566a:
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Re: HP 8566A large amplitude error in 2-22GHz range
Here's what I get. Worth noting that the attenuation I see is not so consistent. I've seen worse than this before.
Attachments:
Is this with maxhold? For comparison, here's what I see on my 8566B with maxhold on the trace, no input. Note that the lower bound of your trace isn't far off the max noise level of my 8566B, but then it's as if you have something riding on top of that. Here's what it looks like without maxhold:
My 8566B had a random noise problem in the IF section that manifested in both bands (0-2.5GHz and the upper band). What does your low band look like?
Siggi
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Re: HP 8566A large amplitude error in 2-22GHz range
so it seems the problem is only in band 3 and 4. if I am not mistaken. I am not very familiar with the detail of this analyzer
but all I can say is that the first thing to do is to fix the unlock issue.?
you can start simply by YTO adjustment procedure as suggested by others
personally I dont think it is just about adjustment though....
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Re: HP 8566A large amplitude error in 2-22GHz range
Yeah that¡¯s fair. I ordered it Oct 25 so it¡¯s been a little more than 30d. Good lesson that I need to test these immediately when I receive them.
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Re: HP 8566A large amplitude error in 2-22GHz range
how long ago did you receive the unit?
FWIW ebay pretty much always acts in buyer's favor. very rarely it is otherwise..
but if it's like 2-3 month since you received it then frankly they are right.
when you open a claim on ebay or paypal you will not be able to do that on the other one. it will automatically close.
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Re: Value of gold and tubes
Hi Jim
?
Thank you for finding this and pointing it
out to members
?
Regards Paul
?
?
Just a FYI...This site has many H-P Journals free for
looking
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 ?
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?
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HP Journal: Tech publicationof Hewlett Packard
beginning in 1949
The HP
Journal was the technical publication of Hewlett Packard, covering
engineering and products of the compan...
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On Monday,
December 7, 2020, 10:01:42 AM PST, ghnatiuk@... <ghnatiuk@...>
wrote:
So true Dave.
There is much design history that goes along with the instruments.
Those that are interested should get a copy of the book "Inventions of
Opportunity" which are selected articles from the old HP Journals.
GH
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
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Re: HP 8566A large amplitude error in 2-22GHz range
If you can demonstrate you have been in contact with the seller , showing dissatisfaction with the purchase, they should not be able to close the case
My view of e-bay is that I dont buy anything unless I'm willing to lose the money, I've never spent more than $20 on a purchase.
Yes I know I'm similar to a Charles Dickens character :)
If you used paypal , you also make a complaint to them as well
Good luck
Richard
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On 07/12/2020 20:27, huszaghmatt@... wrote: Unfortunately, Ebay closed my case because it's after a certain number of days from when I received it (I only just got around to testing it). But, I'm trying to appeal.
Ok, I will perform that test and send the picture.
--
Best wishes /73
Richard Bown
Email : richard@...
HTTP :
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Ham Call: G8JVM . QRV: 50-432 MHz + Microwave
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV 6mtrs 200W, 4mtrs 150W, 2mtrs 300W, 70cms 200W,
Microwave 1296MHz 110W, 2320MHz 100W, 5760MHz 10W & 10368MHz 5W
OS: Linux Mint 20, on a Dell Inspiron 3580 laptop
######################################################################
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Re: HP 8566A large amplitude error in 2-22GHz range
Here's what I get. Worth noting that the attenuation I see is not so consistent. I've seen worse than this before. 
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Re: HP 8566A large amplitude error in 2-22GHz range
Unfortunately, Ebay closed my case because it's after a certain number of days from when I received it (I only just got around to testing it). But, I'm trying to appeal.
Ok, I will perform that test and send the picture.
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Liam Perkins
Paul Bicknell