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Re: HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"
I repaired an 8753ES with the same problem. If my solution does not work it is easily reversed - just one resistor. My repair log follows my thoughts and reasons for my actions. HP would have replaced the YIG. After 8 years the VNA is still working. DO NOT MAKE ANY ADJUSTMENTS UNTIL THE PROBLEM IS FIXED. You will just introduce more problems making it impossible to find what the origin fault was. See attached
On Fri, Nov 3, 2023 at 3:28?AM Dave G8KHU < david@...> wrote: You don't say which model type you have, but assuming its the ES (as you say :"Seems the 8753ES has a known problem with YIG oscillator") then as Burt says you need the link between R Out and R In. This is on the lower right of the front panel - there are two SMA sockets labeled "R Channel" "In" and "Out". For normal operation these should be linked - otherwise you will get all sorts of error messages. Ex HP it's a small diameter coax (086 semi-rigid) and easily damaged. Any shortish SMA - SMA coax suitable for the maximum frequency of the 8753 can be used there to test.
If you could confirm which model it is then it would be very helpful so you can get more targeted help. For example Alan's comment is absolutely correct for the earlier versions which had an external test set eg A, B etc - but it won't help with the ES as that model has an integrated S parameter test set.
Dave
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Re: VNA cal kit manager and Prologix GPIB?
Have you looked at this HP app note?
"Specifying Calibration Standards and Kits for Keysight Vector Network Analyzers" 5989-4840
Look at appendix F for the 8510 Michael
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Does anyone have a scan of the complete operation manual for the?59401 HPIB Bus Analyzer?
All the copies I've found on-line seem to be missing page 3-5.
Also, I'm looking for a Service Manual / Schematic
Michael
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Re: HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"
Hi ? Oh my god. That just shows how little I am familiar with the old HP VNA. I assumed I could measure on say the R input. I used to use a HP4195, and as far as I remember we did it that way for G/P measurements (comparing R/A inputs) ? Anyway I hooked the HP8753D up to the test set, and now it works. You all saved me a lot of worry ? ? I still have the HP8753ES that shows an error. ? About the connection, I cannot see that. On the front there is only the 4 N connectors: ? https://www.electronicsdesign.dk/tmp/frontpanel.jpg ? On the back: ?
? I have an external testset for that one too, only 75ohms (HP86045B) ? Regards ? Klaus ?
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From: [email protected] <[email protected]> On Behalf Of Dave G8KHU
Sent: 3. november 2023 08:28
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"? You don't say which model type you have, but assuming its the ES (as you say :"Seems the 8753ES has a known problem with YIG oscillator") then as Burt says you need the link between R Out and R In. This is on the lower right of the front panel - there are two SMA sockets labeled "R Channel" "In" and "Out". For normal operation these should be linked - otherwise you will get all sorts of error messages. Ex HP it's a small diameter coax (086 semi-rigid) and easily damaged. Any shortish SMA - SMA coax suitable for the maximum frequency of the 8753 can be used there to test.
If you could confirm which model it is then it would be very helpful so you can get more targeted help. For example Alan's comment is absolutely correct for the earlier versions which had an external test set eg A, B etc - but it won't help with the ES as that model has an integrated S parameter test set.
Dave
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Re: Search for HP10811-60105 documentation
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George KD6NEW
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On Nov 3, 2023, at 8:25 AM, Lou Blasco <vk3alb@...> wrote:
?Hi,
I have a HP10811-60105 Crystal Oscillator and I'm looking for any technical notes for it. ?I've looked in the files section and chased through and old email thread regarding the same part number with no luck. This device has a 30 pin edge connector and looks like it should be bolted to a bracket of some sort. Any help would be much appreciated.
--
Regards
Lou
VK3ALB
Re: VNA cal kit manager and Prologix GPIB?
Thanks, folks!
Now, I just have to figure out how to describe my cal kit.
The numbering part confuses me.
Is the standard numbering arbitrary or is there a discription of which kind of standard should get which number?
How would the system distinguish an ordinary load from a sliding load?
Tom DG8SAQ
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Re: Search for HP10811-60105 documentation
Answering my own email within minutes is never a good thing. It seems I'm after a 10544 as mentioned in the email trail I followed?but didn't read carefully enough.. There's plenty of information in the files section to get me going.
Hi,
I have a HP10811-60105 Crystal Oscillator and I'm looking for any technical notes for it.? I've looked in the files section and chased through and old email thread regarding the same part number with no luck. This device has a 30 pin edge connector and looks like it should be bolted to a bracket of some sort. Any help would be much appreciated.
--
Regards
Lou
VK3ALB
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Search for HP10811-60105 documentation
Hi,
I have a HP10811-60105 Crystal Oscillator and I'm looking for any technical notes for it. I've looked in the files section and chased through and old email thread regarding the same part number with no luck. This device has a 30 pin edge connector and looks like it should be bolted to a bracket of some sort. Any help would be much appreciated.
--
Regards
Lou
VK3ALB
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Re: HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"
You don't say which model type you have, but assuming its the ES (as you say :"Seems the 8753ES has a known problem with YIG oscillator") then as Burt says you need the link between R Out and R In. This is on the lower right of the front panel - there are two SMA sockets labeled "R Channel" "In" and "Out". For normal operation these should be linked - otherwise you will get all sorts of error messages. Ex HP it's a small diameter coax (086 semi-rigid) and easily damaged. Any shortish SMA - SMA coax suitable for the maximum frequency of the 8753 can be used there to test.
If you could confirm which model it is then it would be very helpful so you can get more targeted help. For example Alan's comment is absolutely correct for the earlier versions which had an external test set eg A, B etc - but it won't help with the ES as that model has an integrated S parameter test set.
Dave
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Re: semi-OT: Cleaning smoke smell out of electronics
so, circling?back on this, here's what I ended up doing that seemed to work.
The gear in question here is a Wavetek 288 function generator. There's nothing inside of it that's particularly?weird so I had a fair amount of freedom.?
Some components were under RF shield cans and I was worried that any fluids used would get trapped in them and either not dry correctly or cause some sort of issue so I un-soldered the cans from the boards and cleaned them separately. all of the boards?and chassis were disassembled?and washed using dilute Dawn detergent and DI water and lightly scrubbed with an ESD safe cleaning brush, given a very thorough rinse?in DI water and excess water removed with dry oil free compressed air and left to dry over the weekend. The chassis mounted transformer was left in place and a ziplock was taped around it so it?did not?get splashed and then was wiped with IPA.? this seems to have gotten rid of 90% of the smell. the smell I can't get rid of is what has soaked into the plastic wire jackets and the soft keyboard parts.?
On Tue, Oct 17, 2023 at 6:39?AM victor smith < vcs3@...> wrote: That¡¯s a great tip, Martin, thank you!
-- --Eric
_________________________________________
Eric Garner
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Re: HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"
You do not mention if you have the hp85046A s parameter test set. The test set will provide proper routing?
through the cables from the VNA so RF out will be delivered to the R port. Without the test set, the 8753 by itself will indeed generate the error message.?
As Burt mentioned you need to provide at least that connection and then add on a single or dual direction coupler or?
the desired test set for a working system.?
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Re: HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT LEVEL"
Klaus,
There are all kinds of possibilities that can cause this problem, but the
first thing you need to try is to put a cable between the "RF
Out" and the "R" input. Without that reference signal fed
into the "R" (Reference input) There will be no I.F. created in
the instrument and you will get that error message.
I have an Agilent (HP 8753es, option 10 and 11 instrument and I love
it.
Enjoy,
Burt, K6OQK
HP8753 error, "CAUTION: NO IF FOUND: CHECK R INPUT
LEVEL"
From:
kvk@...
Date: Thu, 02 Nov 2023 05:14:28 PDT
Hi
I have an HP8753 network analyzer I bought at an auction.
When powered up, it shows the error: "CAUTION: NO IF FOUND: CHECK R
INPUT LEVEL"
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa@...
K6OQK
--
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, CA 91201 U.S.A.
K6OQK
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Re: Cheap and simple OXCOs upgrades on ebay
Thanks very much for the information and photos. I have used various OXCOs such as this one for many years; most were made by Vectron and use SC crystals for long-term stability and temperature insensitivity. Usually, I want to be able to adjust the frequency from outside of the equipment, because the oscillator is buried inside a piece of equipment.? I use a multiturn stable pot with a small voltage range, installed where I can get to it with a small screwdriver. I haven't done it yet with one of these.?
I am currently installing one of these boards into an HP 5347A 20 GHz frequency counter. I am going to use a separate small power supply for the OXCO. I don't want to load down the HP power supply.
Stuart K6YAZ Los Angeles, California.
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Re: 4195A restoration adventure*
There is a DAC in one of the units which is known to fail.
The MDAC.? Maxim MX7523JNhttps://www.eevblog.com/forum/repair/hp-4195a-vna-issues/
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Re: 4195A restoration adventure*
There is a DAC in one of the units which is known to fail. I need to look it up for you, afaik on mikrocontroller net and eevblog there was discussion of
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The photo shows the relevant portion of the Inguard circuit.
It appears to me that if I disconnect and short the voltmeter inputs at J9 & J11 and remove E1 I should have the relay boards feeding the back panel banana jacks which I can connect to my 3457A.
Does jumper J3 set to no A/D allow directing the 100 inputs from the 3497A to an external meter?
Goal is to select a channel with the 3497A and measure with a 3457A. If that goes well I may well spring for a 3458A.
I have a 3457A which will give 7.5 digits. I have in mind measuring 80 or so voltage references over a multiyear period along with temperature control and logging.
This is motivated by volt and time nuts posting plots accompanied by unsupported claims, but refusing to provide the digits for independent analysis . All I've asked for is a chance to be proven wrong without having to wait for years to record my own data. After 10 years of asking I'm going to collect my own data. Simply put, I am a reflection seismologist. We invented DSP in the 1950s (search for " MIT Geophysical analysis Group under Norbert Weiner" for proof).
Reg
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Re: Wanted: WORKING 8482A Power Sensor
Well... aren't most people?
There are still a few 8482As left, that haven't had their measuring thermocouple vaporized an shot into outer space... by people who don't know what a milliwat or a dBm is.
What's reasonable?
One time... a long time now... used ones... but not terribly abused to death... they were 'reasonably' price... but dwindling numbers of 'good' ones has seem to made the unreasonable reasonable.
And what's working?
IMO... there's more to it than just getting one the power meter recognizes, zeros and gives a reading.
It seems to me... there ought to be more of them in Japan, than over hear. (Hoarding them, and trying to corner the market, for sale on Ebay, seems more of a thing here.)
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Re: File /HP , Agilent Firmware & Programs/KeyCodeGenerator.7z uploaded
#file-notice
Hello Mr Flanagan, Thanks for this wonderful tool. I could activate the LAN option on my 8711C.   Perhaps I will try to update the firmware in the near future. Bruno Torremans
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Re: HP 3490a Multimeter shows all 2s.
Hi Alan,
Would you ship it down under (Australia)? I'm curious enough to see if it could be resurrected.
Regards,
Waz
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Re: Cheap and simple OXCOs upgrades on ebay
Okay, here's some stuff to nudge us back on topic... One of the two boards I bought from sz.plaza.com had a defective regulator, and I cooked the OCXO before I realized the problem. So I decapitated it and took a photo of the PCB, top and bottom. Images here:? OCXO Photos? The second board was modified to increase the tuning adjustment range, R3 changed from 36k to 4.99k, and ?1meg resistor brought out from the R2, R3 junction to the ?+/- 5V control voltage of my vintage Symmetricom GPSDO. I placed some foam insulation around the OCXO case, and after a day or two of stabilization I am seeing offsets in the E-11 to E-12 range. The temperature setpoint appears to be 50C I've run the rest of my stock against the GPSDO to see where the control voltages are now with aging. Serial # ? ? Voltage 130802 ? ? 1.7052 131221 ? ? 1.8515 140121 ? ? 1.8662 140310 ? ? 1.8366 140610 ? ? 1.9876 Yet to do, is capture the statistics out of the GPSDO to see if there is either a diurnal phase shift, or some slow oscillation in the servo loop. More as it happens... Dave? KC6UPS
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vk2bea
Glydeck
Burt K6OQK
ROMDUMP
