Re: Help request - how to test an HP8350B RF plugin YIG
Yves,
?
if R4 is factory preset for that reason
the voltage where harmonics are minimal
forgot my comment, the plug-in is well working.
?
John
|
Re: Help request - how to test an HP8350B RF plugin YIG
Hello Yves,
I'm back in the daily chat we have.
?
I have checked the A9 and the resistors R1 and R2.
Wire by wire, pin by pin, they are the same (with continuity test and diode tests).
?
I twisted the A9 in the two Plug-ins
the working is working with both of them, the under service in not working.
?
I'm out of new ideas, I have to think out of A8 & A9
I must go in the bigger RF block diagram to look for the reason of the problem.
?
Any suggestion will be welcome.
John
|
?
I'm permitting this post, but can I ask the ORIGINAL POSTER that a subject more informative than "Ff proposals" is used next time. I'm not going to change the subject line this time, but please use a better subject in future.
?
David Kirkby (group owner)
|
I use something from the department store called Rapid.
I think plasctic padding is the same as Bondo 2 components.
The reason for not using Epoxy for securing the RODs after adjustment is due to the Cappilar effect and the Epoxy is sucked into the tube containing the rod. After the glue hardenes it is game over for moving the rods afterwards. I have tried that a couple
of times. Sometimes you want to move the Rods after the adjustment.
But again I warn people It is not for faint hearted people. I ruined some filters learning this ?
best regards Peter
thanks Peter for sharing your experience; there are many types of 2K Araldite What type did you use?
Also: can you clarify better these sentences of yours
" When tuning the filter be carefull to use right type of glue that does not shrink when curing."? As far as I know 2 components epoxy does not shrink
and
" Plastic padding is good to use and does not shrink and can be removed with heat. "?? ?Which plastic padding are you referring to ?
?
adri
?
?
?
?
toggle quoted message
Show quoted text
----- Messaggio originale -----
Inviato: 26/09/2024 22:42:29
Oggetto: Re: [HP-Agilent-Keysight-equipment] HP8595E - SYTF
Hello group I have in many cases glues the ball back but it is not for the faint hearted. I use 2 component Aradite. And the trick is to add a tiny amount the front of the YIG rod so very little. And then pick up the ball and place the rod vertical beacuse
the glue will pull the ball to center. Let it dry for long time 24hours if quick Araldite is used.?
If the ball is lost it is easy to find using a magnet and microscope. But My procedure sounds easiere than it is. When tuning the filter be carefull to use right type of glue that does not shrink when curing. Plastic padding is good to use and does not shrink
and can be removed with heat.?
The golden Mesh is needed to be mounted back otherwise you will have lots of responses as the filter components can "see" each other.
Gl trying
73 Peter
Adri,
?
I also changed my SYTM on my 8595E a few months ago.
And I too had one of the spheres that had come loose.
Last week I had the same idea as you, to try to glue the sphere back on.
But the rod was fractured in the cylinder and not visible.
I realized this when I removed the base to free up space to recover the Sphere.
In short, it didn't work. I encourage you to try, you have nothing to lose.
But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise, on the other side (180 degrees).
?
Yves
?
?
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned
Filter) with a huge insertion loss (>50dBm)
Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres)
?
Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss
It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was lying on the bottom of
its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip)
?
I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the rod and will?try to find the correct alignment and rotation angle)
?
Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of a mm in diameter (pic) from
glue residues is something I'd ?gladly avoid
Thanks for ideas
adri
|
Hello Jeff you are so right. I use a 8757 system with 26GHz detectors then I can adjust even the ones for 8563E with internal mixers in due to the detectors just look for signal and not looking at certain frequencies then it is a game of compromizes until best
flatness and lowest loss is acheived. and they are not at the same point ?
73 Peter OZ1LPR
Well, an interesting thread.I have opened many a yig:oscillators, filters and harmonic multipliers. Thing is, re-attaching the ball to the end of the rod is not enough. It has to be correctly oriented on the magnetic axis in two dimensions or it will be very
lossy/may not work. The balls are usually attached to a rexolite rod or beryllia (spl?) rod if a PTC heater is used. Usually the yig sphere is adjusted so that one of the angular axis is correct (rod and sphere in a fixture with a magnetic field applied),
then this is glued. Then the rod is inserted in the resonant structure and the depth and the angle of rotation (the other angular perpendicular axis) is set. Pretty tough to do on the fly!
I commend you on the attempt, however. Those yig balls look like fly dirt,they can be tiny!
Regards, Jeff Kruth
?
?
?
In a message dated 9/26/2024 5:25:00 PM Eastern Standard Time, tncdrn@... writes:
?
thanks Peter for sharing your experience; there are many types of 2K Araldite What type did you use?
Also: can you clarify better these sentences of yours
" When tuning the filter be carefull to use right type of glue that does not shrink when curing."? As far as I know 2 components epoxy does not shrink
and
" Plastic padding is good to use and does not shrink and can be removed with heat. "?? ?Which plastic padding are you referring to ?
?
adri
?
?
?
?
toggle quoted message
Show quoted text
----- Messaggio originale -----
Inviato:?26/09/2024 22:42:29
Oggetto:?Re: [HP-Agilent-Keysight-equipment] HP8595E - SYTF
Hello group I have in many cases glues the ball back but it is not for the faint hearted. I use 2 component Aradite. And the trick is to add a tiny amount the front of the YIG rod so very little. And then pick up the ball and place the rod vertical beacuse
the glue will pull the ball to center. Let it dry for long time 24hours if quick Araldite is used.?
If the ball is lost it is easy to find using a magnet and microscope. But My procedure sounds easiere than it is. When tuning the filter be carefull to use right type of glue that does not shrink when curing. Plastic padding is good to use and does not shrink
and can be removed with heat.?
The golden Mesh is needed to be mounted back otherwise you will have lots of responses as the filter components can "see" each other.
Gl trying
73 Peter
?
Adri,
?
I also changed my SYTM on my 8595E a few months ago.
And I too had one of the spheres that had come loose.
Last week I had the same idea as you, to try to glue the sphere back on.
But the rod was fractured in the cylinder and not visible.
I realized this when I removed the base to free up space to recover the Sphere.
In short, it didn't work. I encourage you to try, you have nothing to lose.
But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise,
on the other side (180 degrees).
?
Yves
?
?
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition
to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned Filter) with a huge insertion loss (>50dBm)
Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres)
?
Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss
It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the
tip of the quartz rod that supports it and was lying on the bottom of its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip)
?
I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the
rod and will?try to find the correct alignment and rotation angle)
?
Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can
work and cleaning a sphere of a few tenths of a mm in diameter (pic) from glue residues is something I'd ?gladly avoid
Thanks for ideas
adri
?
|
Hello Yves use a magnet to find it again. IT is small and sweeing your work bench would most likely recover it.
best regards Peter
Adri,
?
Finally, with all this manipulation, I lost my sphere by accident and I could not find it again. So, I decided to end this recovery project, and I kept the two remaining rods with their supports as spares.
My 8595E is fully functional, stable and well aligned since the replacement of the SYTF.
?
However, I realize that I should have been much more careful during the manipulations, and to do all this at a quieter time. I had several interruptions during the different manipulations and this is not the
only project in progress. But it was still an enriching experience. I wish you to have more success than me.
?
Yves
?
Yves, I'm not sure about?how to replace the quartz rod but if the problem is to free from the fragments the cylindrical cavity where?the rod was inserted , I would like
to point out that if you remove the rubber cap corresponding to the affected corner (pic) you can push the fragments out of the cavity with any metal rod with a diameter >= 0.75mm
toggle quoted message
Show quoted text
----- Messaggio originale -----
Inviato: 25/09/2024 23:43:57
Oggetto: Re: [HP-Agilent-Keysight-equipment] HP8595E - SYTF
Adri,
?
I also changed my SYTM on my 8595E a few months ago.
And I too had one of the spheres that had come loose.
Last week I had the same idea as you, to try to glue the sphere back on.
But the rod was fractured in the cylinder and not visible.
I realized this when I removed the base to free up space to recover the Sphere.
In short, it didn't work. I encourage you to try, you have nothing to lose.
But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise, on the other side (180 degrees).
?
Yves
?
?
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the
SYTF (Switched Yttrium Tuned Filter) with a huge insertion loss (>50dBm)
Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres)
?
Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss
It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was
lying on the bottom of its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip)
?
I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the rod and will?try to find the correct alignment
and rotation angle)
?
Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of
a mm in diameter (pic) from glue residues is something I'd ?gladly avoid
Thanks for ideas
adri
|
Re: Help request - how to test an HP8350B RF plugin YIG
Hi John, ? I checked the TP "G" which is the voltage where harmonics are minimal. This R4 adjustment is done at the factory, and in my case, the voltage of -0.298V is the optimal voltage. ? ? ? ? I'm amateur electronic engineer (Hobby engineer) so In my work time I'm thinking manual case's of working conditions etc. that means that Q1 is always closed ? Another point (question): At my manual Hp83592A, the TP "G" is approximately -2Vdc in your photo is -0.298Vdc (in your working plug in)
|
Re: Efratom MBF distrib amps
OK, my MBF are a different kettle of fish: no dividing going on, just amplification.
They were originally fed 5 MHz from the FRK-HLN Rb. Outputs are 5 individually output level adjustable sine waves. 4 are BNC on the front panel, 1 is on the DIN41612 connector at the rear of the MBF for use in the chassis. In original state the MBF were nicely peaked at 5 MHz. No way to get a 10 MHz through. Hence the playing with the filter. I also have a variant that has no front BNC, rather teflon coax runs to the DIN41612. This MBF is for chassis-internal distribution.
Picture of my MBF. A close look shows the 5 identical amps. Adjustment pots are on the rear of the PCB.
Aside: this Efratom was a deal you do not often get. It had dual FRK-HLN 5 MHz Rb, an MGPS, dual PSU, dual lead-acid battery backup modules, a phase meter to adjust the free running Rb against the MGPS disciplined one, a switchable output module to select one or the other Rb for driving the 6 MBF, a divider/synth module that produces 2.048 MHz and a monitoring module. All housed in a stacked 2x 3U and double-deep 19" module. Total cost €75
Came from a military mobile sat groundstation.
Wilko
|
Re: 8566B Performance Verification with 8620C
The original frequency response alignment procedure for the 8566A was done with first and 8620C and an appropriate plug-in: 86222C for 10 MHz to 2.4 GHz; 86290C for 2GHz to 18.4 GHz; 86260C for 17.0 GHz to 22GHz, all normalized in output against a 436A using 8482A and 8485A sensors. The align procedure is in the 8566A Test and Adjust manual, later adapted to the 8350B and 83592A/B/C and 83595A/B/C plug-ins. And finally adapted for the 8340B/C sweeper. You can also use the 836xx family of sweepers for the Test and Align/ Performance Test procedures.
Don Bitters
|
Re: HP 8566B Not Showing Any Signal
Have you ever had one of those days where you fixed something and have no idea what you did that fixed it? That was my day.?
|
Well, an interesting thread.I have opened many a yig:oscillators, filters and harmonic multipliers. Thing is, re-attaching the ball to the end of the rod is not enough. It has to be correctly oriented on the magnetic axis in two dimensions or it will be very lossy/may not work. The balls are usually attached to a rexolite rod or beryllia (spl?) rod if a PTC heater is used. Usually the yig sphere is adjusted so that one of the angular axis is correct (rod and sphere in a fixture with a magnetic field applied), then this is glued. Then the rod is inserted in the resonant structure and the depth and the angle of rotation (the other angular perpendicular axis) is set. Pretty tough to do on the fly!
I commend you on the attempt, however. Those yig balls look like fly dirt,they can be tiny!
Regards, Jeff Kruth
?
?
?
In a message dated 9/26/2024 5:25:00 PM Eastern Standard Time, tncdrn@... writes:
?
thanks Peter for sharing your experience; there are many types of 2K Araldite What type did you use?
Also: can you clarify better these sentences of yours
" When tuning the filter be carefull to use right type of glue that does not shrink when curing."? As far as I know 2 components epoxy does not shrink
and
" Plastic padding is good to use and does not shrink and can be removed with heat. "?? ?Which plastic padding are you referring to ?
?
adri
?
?
?
?
----- Messaggio originale -----
Inviato: 26/09/2024 22:42:29
Oggetto: Re: [HP-Agilent-Keysight-equipment] HP8595E - SYTF
Hello group I have in many cases glues the ball back but it is not for the faint hearted. I use 2 component Aradite. And the trick is to add a tiny amount the front of the YIG rod so very little. And then pick up the ball and place the rod vertical beacuse the glue will pull the ball to center. Let it dry for long time 24hours if quick Araldite is used.?
If the ball is lost it is easy to find using a magnet and microscope. But My procedure sounds easiere than it is. When tuning the filter be carefull to use right type of glue that does not shrink when curing. Plastic padding is good to use and does not shrink and can be removed with heat.?
The golden Mesh is needed to be mounted back otherwise you will have lots of responses as the filter components can "see" each other.
Gl trying
73 Peter
?
Adri,
?
I also changed my SYTM on my 8595E a few months ago.
And I too had one of the spheres that had come loose.
Last week I had the same idea as you, to try to glue the sphere back on.
But the rod was fractured in the cylinder and not visible.
I realized this when I removed the base to free up space to recover the Sphere.
In short, it didn't work. I encourage you to try, you have nothing to lose.
But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise, on the other side (180 degrees).
?
Yves
?
?
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned Filter) with a huge insertion loss (>50dBm)
Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres)
?
Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss
It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was lying on the bottom of its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip)
?
I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the rod and will?try to find the correct alignment and rotation angle)
?
Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of a mm in diameter (pic) from glue residues is something I'd ?gladly avoid
Thanks for ideas
adri
|
Re: 8566B Performance Verification with 8620C
Just a follow up on this. I got a hold of the Performance Tests section of an old 8566A manual (Part 4 of the "Operating and Service Manual" which is contained in Volume 2, such a confusing manual history for this line).
They DO use an 8620C with 86222A for up to 2.4GHz and the 86290B Opt H08 (option gets it up to 22GHz) for the higher frequencies.
Interestingly for the 2.4GHz sweep, you dont use the external ALC, but rather you take power meter readings at select frequencies before the sweep, then do the sweep, then correct the displayed results with your previous power meter readings. All of this is done with a 20dB attenuator at the input of either the 8566 or the power sensor. Power meter is used to set output of 86222A to -15dB (after the attenuator).
The higher frequency setup has you use external ALC but with diode detector (33330C) feedback instead of power meter feedback like in the later manuals. You still set the 86290B output power with a power sensor/meter beforehand.
So the 86222A seems nice for the lower frequency check- I will go that route and hold out for an 8340A/B later. The exotic H08 option for the 86290B seems harder to come by than any 8340A/B. Of course could probably check on the 8350 series, too....?
-Michael Bierlein
On Wed, Sep 25, 2024 at 18:36 Michael Bierlein via <bierl008= [email protected]> wrote: I have been puttsing through the 8566B Performance Tests and Adjustments manual for fun and am wondering if I can use an 8620C (with associated plugin) for the frequency response check instead of the 8340 series. To me, it seems the main thing you need is a nice flat sweep at -10dBm. However, I am an RF neophyte and have never used a dedicated sweeper.
?
8566B flatness performance requirements (at -10dBm):
0.06 to 2.5 GHz is 0.6dB
2 to 12.5 GHz is 1.7dB?
12.5 to 20 GHz is 2.2dB
20 to 22 GHz is 3dB
?
8620C flatness with 86222A ?(0.01 to 2.4 GHz) is 0.25dB internally leveled and 0.1dB externally leveled.
8620C flatness with 86290B (2 to 18.6 GHz) is 0.7dB to 0.9dB internally leveled and 0.15dB externally leveled.
?
Seems to be within the spec up to 18.6 GHz. 86222A hits it on the lower frequencies even with internal leveling. However, I am not sure about getting these specs at an output of -10dBm. Do I need an attenuator? Will this compromise the output flatness?
?
Seemed worthwhile to compare the 8620 to the quoted 8340A. However, from a quick glance at the 8340A spec sheet, it is not as straightforward for externally leveled info. For the internally leveled flatness at output power of -10dBm it quotes 0.9dB (0.01 to 2.3 GHZ), 1.6dB (2.3 to 20 GHz), 2.1dB (20 to 26.5 GHz). So, this makes sense why you need to have the 8340 externally leveled in order to be within the flatness spec of the 8566B.
?
As a side note, it is interesting to view the progression from "Sweep Oscillator" to "Synthesized Sweeper" in the HP Catalogs and how it really seemed to be a game changer.
?
Thanks for any insights!
?
-Michael Bierlein
|
Re: Remoting an HPIB printer
Just to +1 Dave - I run 3 x 37204's off some 50ohm cable on 25' runs without any issue other than the system controller issue (which is almost certainly the GPIB-ENET/1000)
?
TonyG
|
It's interesting that there are a number of cases of this broken-off YIG sphere. There must be some kind of quality or materials problem in there. I vaguely recall another similar discussion here a couple years or so ago - or maybe it's the same issue again.
?
Ed
|
Re: Remoting an HPIB printer
On 9/25/24 22:13, bownes wrote: I was thinking I could not use the old 75 ohm CATV run. But lo, it does want 75¦¸ cable. That just might work. ?Hmmm and I could put the HP85A on there as well¡. Darn you all. Another project! Doooo eeeet, mon! ;) I actually run the 37203As with 50-ohm cable; no issues. None of my runs are longer than about 60 feet, though. I use RG316. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: Remoting an HPIB printer
On 9/25/24 15:52, bownes wrote: Given the vaguely unnatural nature of this question, it¡¯s probably best answered by Dave McGuire however, I¡¯ll put it out there for anybody just in case. Seems perfectly natural to me, Bob. Maybe you're hanging out with the wrong crowd. ;) Sorry I missed the boat earlier, yesterday was busy here. Has anybody discovered away, using either USB to HPIB converters, or ethernet to HPIB converters, to remotely locate or talk to a remotely located HPIB printer?
My situation is this, I have a very nice HP inkjet printer with HPIB be located in the basement where there¡¯s plenty of room. It generally speaks to the instruments down there. However, I also have a number of instruments in my lab upstairs, which I¡¯d love to be able to send print jobs to said printer. You mentioned in a subsequent post taht you have some 75-Ohm CATV cabling around. Use that with a pair of 37203A HP-IB extenders. I use those extenders with all sorts of stuff all over my lab, in concert with 59307A VHF switches. I've not used them with printers, but they work with lots of other stuff. And it sure beats using the CATV wiring for its original purpose. :) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Adri, ? Finally, with all this manipulation, I lost my sphere by accident and I could not find it again. So, I decided to end this recovery project, and I kept the two remaining rods with their supports as spares. My 8595E is fully functional, stable and well aligned since the replacement of the SYTF. ? However, I realize that I should have been much more careful during the manipulations, and to do all this at a quieter time. I had several interruptions during the different manipulations and this is not the only project in progress. But it was still an enriching experience. I wish you to have more success than me. ? Yves ? Yves, I'm not sure about?how to replace the quartz rod but if the problem is to free from the fragments the cylindrical cavity where?the rod was inserted , I would like to point out that if you remove the rubber cap corresponding to the affected corner (pic) you can push the fragments out of the cavity with any metal rod with a diameter >= 0.75mm
toggle quoted message
Show quoted text
----- Messaggio originale ----- Inviato: 25/09/2024 23:43:57 Oggetto: Re: [HP-Agilent-Keysight-equipment] HP8595E - SYTF
Adri, ? I also changed my SYTM on my 8595E a few months ago. And I too had one of the spheres that had come loose. Last week I had the same idea as you, to try to glue the sphere back on. But the rod was fractured in the cylinder and not visible. I realized this when I removed the base to free up space to recover the Sphere. In short, it didn't work. I encourage you to try, you have nothing to lose. But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise, on the other side (180 degrees). ? Yves ? ? in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned Filter) with a huge insertion loss (>50dBm) Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres) ? Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was lying on the bottom of its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip) ? I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the rod and will?try to find the correct alignment and rotation angle) ? Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of a mm in diameter (pic) from glue residues is something I'd ?gladly avoid Thanks for ideas adri
|
thanks Peter for sharing your experience; there are many types of 2K Araldite What type did you use?
Also: can you clarify better these sentences of yours
" When tuning the filter be carefull to use right type of glue that does not shrink when curing."? As far as I know 2 components epoxy does not shrink
and
" Plastic padding is good to use and does not shrink and can be removed with heat. "?? ?Which plastic padding are you referring to ?
?
adri
?
?
?
?
toggle quoted message
Show quoted text
----- Messaggio originale -----
Inviato: 26/09/2024 22:42:29
Oggetto: Re: [HP-Agilent-Keysight-equipment] HP8595E - SYTF
Hello group I have in many cases glues the ball back but it is not for the faint hearted. I use 2 component Aradite. And the trick is to add a tiny amount the front of the YIG rod so very little. And then pick up the ball and place the rod vertical beacuse the glue will pull the ball to center. Let it dry for long time 24hours if quick Araldite is used.?
If the ball is lost it is easy to find using a magnet and microscope. But My procedure sounds easiere than it is. When tuning the filter be carefull to use right type of glue that does not shrink when curing. Plastic padding is good to use and does not shrink and can be removed with heat.?
The golden Mesh is needed to be mounted back otherwise you will have lots of responses as the filter components can "see" each other.
Gl trying
73 Peter
Adri,
?
I also changed my SYTM on my 8595E a few months ago.
And I too had one of the spheres that had come loose.
Last week I had the same idea as you, to try to glue the sphere back on.
But the rod was fractured in the cylinder and not visible.
I realized this when I removed the base to free up space to recover the Sphere.
In short, it didn't work. I encourage you to try, you have nothing to lose.
But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise, on the other side (180 degrees).
?
Yves
?
?
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned Filter) with a huge insertion loss (>50dBm)
Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres)
?
Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss
It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was lying on the bottom of its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip)
?
I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the rod and will?try to find the correct alignment and rotation angle)
?
Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of a mm in diameter (pic) from glue residues is something I'd ?gladly avoid
Thanks for ideas
adri
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Hello group I have in many cases glues the ball back but it is not for the faint hearted. I use 2 component Aradite. And the trick is to add a tiny amount the front of the YIG rod so very little. And then pick up the ball and place the rod vertical beacuse
the glue will pull the ball to center. Let it dry for long time 24hours if quick Araldite is used.?
If the ball is lost it is easy to find using a magnet and microscope. But My procedure sounds easiere than it is. When tuning the filter be carefull to use right type of glue that does not shrink when curing. Plastic padding is good to use and does not shrink
and can be removed with heat.?
The golden Mesh is needed to be mounted back otherwise you will have lots of responses as the filter components can "see" each other.
Gl trying
73 Peter
Adri,
?
I also changed my SYTM on my 8595E a few months ago.
And I too had one of the spheres that had come loose.
Last week I had the same idea as you, to try to glue the sphere back on.
But the rod was fractured in the cylinder and not visible.
I realized this when I removed the base to free up space to recover the Sphere.
In short, it didn't work. I encourage you to try, you have nothing to lose.
But when you look at your photo, it looks like it's the rod that broke a little before reaching the sphere, you can always try to repair it there, otherwise, on the other side (180 degrees).
?
Yves
?
?
in a different thread and with the help of some forum members (thanks Yves) I recently restarted my spectrum analyzer which, in addition to having a faulty main oscillator, had the SYTF (Switched Yttrium Tuned
Filter) with a huge insertion loss (>50dBm)
Both components were replaced (the "new" SYTF still required an alignment of the Yttrium spheres)
?
Once the repair was complete I opened the faulty SYTF to try to understand the reason for such a large insertion loss
It was necessary to lift the golden mesh after which the problem was immediately clear: one of the three spheres had detached from the tip of the quartz rod that supports it and was lying on the bottom of
its own cavity? (a pic taken with the microscope shows the sfere?in front of?the rod tip)
?
I removed the rod (pic) and now I'm thinking about how to reattach the sphere to it?(if the operation is successful I will re-insert?the rod and will?try to find the correct alignment and rotation angle)
?
Has anyone have you ever done this type of gluing? It would be natural to try with cyanoacrylate but I am not at all sure that it can work and cleaning a sphere of a few tenths of a mm in diameter (pic) from
glue residues is something I'd ?gladly avoid
Thanks for ideas
adri
|
Re: Efratom MBF distrib amps
On Wednesday 25 September 2024 04:48:49 pm Chuck Harris wrote: 2MHz -> 5MHz. Getting old sucks!
-Chuck Harris Yeah, but it sure beats the alternative... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
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Brad Jackson
Dave McGuire