|
|
Jinxie,
Yes, they can be used to wiggle the modules loose and pull them from their sockets. The same things are used in other instruments such as the 8510C. Do be gentle as they may crack from old age!
toggle quoted message
Show quoted text
On Jul 14, 2024, at 4:34?PM, Jinxie via groups.io <paul666@...> wrote:
?HI all, I would like to pull out one or more of the A10 modules in my 8566B for examination and testing. These are the ones indicated by the arrow in the attached photo. HP have incorporated white plastic bell-shaped stand-offs which I assume are there to make the base of the case more rigid, but can they also be used to pull the modules out of their sockets or is some special tool required? There's no obvious other way to get a grip on them. They've thoughtfully provided 'ring-pulls' for the boards in the A19-A21 slots so it would be odd if they hadn't done something similar for all the A10 ones. Many thanks, J.
<ASSY Block.jpg>
|
HI all,
I would like to pull out one or more of the A10 modules in my 8566B for examination and testing. These are the ones indicated by the arrow in the attached photo. HP have incorporated white plastic bell-shaped stand-offs which I assume are there to make the base of the case more rigid, but can they also be used to pull the modules out of their sockets or is some special tool required? There's no obvious other way to get a grip on them. They've thoughtfully provided 'ring-pulls' for the boards in the A19-A21 slots so it would be odd if they hadn't done something similar for all the A10 ones.
Many thanks,
J.
|
Re: HP 8566B - Can my high voltage transformer be faulty?
Well I found the box of parts. I think they are most of a CRT retrofit kit for the 85662A, as the assemblies in the box mostly match those listed for the S/N 3004A and up variants. In these models, the HV multiplier is integral to the A1A3 HV board. Sounds like this is not what is needed for saevar's unit.
Dave Casey
Hi Don,
Wouldn't a shrunken display usually indicate that the HV was
too high, speeding up the electrons, and reducing how much the
electrostatic deflection system can deflect them?
That's how it works on conventional scopes...
-Chuck Harris
On Sat, 13 Jul 2024 00:31:43 -0500 "Don Bitters via "
<donbitters=[email protected]> wrote:
> I have replaced several in the 85662A many, many years ago. There are
> 2 types depending whether you have a long CRT (PN 5083-5791, IIRC),
> or a shorter CRT newer type dot raster scan CRT (Panasonic). The HV
> transformer is inside the metal box at the rear, left of the CRT
> (A1A6 circuit).? They usually fail open.? You should see a shrunk
> image on the CRT when the HV transformer fails, both horizontally and
> vertically, or a dim dot. You will still have a good display if you
> check the video and horizontal outputs on an oscilloscope.
>
> Don Bitters
>
>
>
>
>
|
Enormously excellent pieces of work. Thanks for making them available to all.
WT
|
Re: VNA calibration kit to 50 GHz
True, ?λ0 (free space) is ~ 29.118 mm, but in WR90, ?λG (wavelength in the waveguide) is something like 37.722 mm, using ??λG = ?λ0/sqrt(1 - ?(λ0/ λC)**2), where ?λC is the cut-off wavelength = 2a, where a = the longer internal waveguide dimension.
|
FS (US/CAN) : HMC365S8 RF prescaler (replacement for Agilent 1GC1-4207)
Cross-posted to EEVblog forums too, https://www.eevblog.com/forum/buysellwanted/fs-(uscan)-hmc365s8-rf-prescaler-(replacement-for-agilent-1gc1-4207)/
***
This is an equivalent of infamous 1GC1-4207 , used in early-mid-2000's HP/Agilent ESA spectrum analyzers (E44xx etc) and ESG signal generators, as part of the PLL chain.
Qty 2, in unopened digi-key bag . These sell for 35$ each. Would like to get 50$ (CAD) for both, buyer pays shipping. US/CAN/Europe.
Selling because my unit has a later revision RF deck with a different prescaler MMIC.
Chris
|
Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
Shameless plug: I make these and sell them on eBay "SMA wrench" , eBay handle "kmec-at-aol".
Doesn't make a lot of money (some time involved), AND you can do it yourself, but I have some fun and enjoy metalwork. (You have to, if you like making microwave stuff). I also have gotten hollow shaft 5/16 Xcelite nutdrivers (yellow handle), and ground away 1/2 of the nut&barrel, makes a MOST handy tool for tightening sma connections, especially on sma relay (hard to get to the center connector with hardlines in the way).
J.Kruth
In a message dated 7/12/2024 2:42:30 PM Eastern Standard Time, james.ford@... writes:
?
Regarding 5/16 inch wrenches with the slot to slip over coax, Mini-Circuits part number HT-4-SMA is about $37.? Nice knurled handle for good grip, too.? Found one in the lab this morning.?
|
Re: VNA calibration kit to 50 GHz
OK, I'll stop after this, I promise!
?
I said " So to that end, short sections of flanged waveguide with shorting plates would work."
?
Lets make it simpler: I am sure we either own (I do) or have a friend that bought one of those $200 simple CNC milling machines (I know, not great but not bad either). No sweat to put a piece of 1/8 inch thick brass plate in one and mill out some WR-90 endcaps. And mill a little grove beside them to make it easy to cut out with a manual hacksaw or bandsaw.
Then scrounge some nice flanged sections of WR-90 (can cut off some junk) and soft or hard solder the end caps on (after you clean up the cut on the guide of course).
Soft solder was used by WE (Western Electric, sorry, didnt spell out in last message) for the Bell System Long Lines hardware and it works fine but doesnt silver plate as well as silver solder (of course).
Now you can make as many custom length shorts as you want for TRL type cal setups. Hell , you might even be able to copy the length to match a set of cal constants you might find tabulated somewhere!
Thought of this while shaving just now (great time to think!).
Jeff Kruth
|
Re: VNA calibration kit to 50 GHz
OK, with further thought, if you did do some software mods for a waveguide cal system, you wouldn't actually need to make the the precision offset short, you just need to know how long they actually are and use that mechanical distance in the software to calculate from. Really anything close would work, because, as Ed (Hi Ed!) pointed out, really only 1/8 wave at one frequency, you just have to know THAT freq!. So to that end, short sections of flanged waveguide with shorting plates would work. If you use the standard 4 hole flange (UG-52?) a purist might argue that the surface contact was not good enough to insure REALLY low ohmage connection, so drill more holes in the flange and use more screws, like WE did on the CMRR flange, or if you can find guide with CMR? standard 8 hole comm flanges (you get more screw pressure and even contact force). Now you dont need to EDM anything, as you as you start with standard pieces of rectangular guide!? You can add the standard 4 hole cover flange to cut off section to make your connection point. If a purist, a little silver soldering for the new flange ( a jeweler can be bribed to do it, I know first hand, as I got some MMW horns repaired!) Then if you plan to make a habit of this stuff, you can get the waveguide pieces silver plated, shorting plates, screws and all (although you can buy silver plated screws for $1 each, thanks W1GHZ!)! There was a company in Cincinnati that would do a basket silver plating of many items for me for $200, beautiful work and was a few years back but should be about the same price at other shops. Then you could paint the stuff and have a "professional" custom waveguide cal set.
Regards, Jeff Kruth
In a message dated 7/13/2024 11:54:16 AM Eastern Standard Time, edr10000@... writes:
?
All of this is somewhat academic as choosing something to be at 1/8 or 3/8 guide wavelength only fits at a single frequency with a short or no add line section.
|
Re: VNA calibration kit to 50 GHz
I have been away and just noticed this. I am from the old era of the original automated VNA measurements. As I am sure you know, what we used the sliding loads for was to help the AVNA determine the locus to the return loss couplers directivity vector, as part of the 12 term error terms for the cal. The new ecal boxes do this automatically, I guess, by using a load on an electrically controllable phase shifter. The load doesnt even have to be that good as the rotation of the return loss vector over the whole phase shift interval will determine to center of the directivity circle and therefore the directivity vector. A lot simpler as I used to have to move the load under computer prompt at each cal freq and it was tedious to do a full up cal.
A blast from the past.
IF you wanted to perform a cal on waveguide hardware, I am sure a routine could be written that operated on the same way. In this case, a sliding load (also a sliding short) could be usefully. The problem would be to set the load or short at exactly the same distances each time. We had dial indicators on some of the waveguide pieces to permit setting to .001 inch (yes, I know about wear and slop, but we would approach the position from the same direction each time, and this helped).
Of course, tedious, but if narrowband and not too many measurement points (freq's) it could be done.
Regards, Jeff Kruth
In a message dated 7/13/2024 2:29:04 PM Eastern Standard Time, rfconsulting.fr@... writes:
?
For the X band, I can confirm that coaxial systems don't require sliding loads (see my previous post). I never use them on my 8720ES. In N I use an 85054D and in APC 3.5 I use an 85052B or D.
|
Whow! Superb!
Thank you, Gianni!
|
Re: VNA calibration kit to 50 GHz
Hello Dr. Kirkby,
Thanks for the details. I have a question and maybe you can make me
understand the offset shorts calculation or maybe you can give me a link
to some article or paper to read.
I was looking on eBay for waveguide calibration kits and I saw the
Anritsu ones for the WR90 waveguide size. There are different sizes but
let's take this one as an example.
Anritsu delivers 2 offset sorts:
- 1/8 Offset short and it writes 4.89mm
- 3/8 Offset short and it writes 14.68mm
WR90 frequency range is 8.20 to 12.40 GHz. Center frequency would be
10.3GHz and λ would calculate as 29.118mm considering relative
permittivity of air to be 1.00058986.
If λ is 29.118mm, λ/8 would be 3.63975mm.
I also calculated using the cut off frequency range for the WR90
waveguide size and it still doesn't match the 4.89mm value for the 1/8
or 3/8 written on the Anritsu offset shorts.
Thank you!
Razvan
The wavelength in a waveguide is nothing like the value in free space. In fact, the wavelength tends to infinity as the frequency tends to cut off frequency of the waveguide.
Dave
|
Re: E4411B forgotten its option(s)
Hi,
I can confirm that your 16MB ROM is correct volume for B72 option
and A.14.06 firmware can fit in including power suite package. And
32MB RAM is correct too. On my E4402B after A14.06 and power suite
being installed I still had like 7MB out of 16MB free.
You can check in system view if power suite is installed. If you
just tried to reinstall firmware without formatting flash (ROM),
power suites was still in ROM and therefore its reinstallation was
not initiated after firmware reinstallation attempt.
Vladimir
?
Dne 14.07.2024 v 14:25 vee-dub565 via
groups.io napsal(a):
toggle quoted message
Show quoted text
Sorry for the duplicate posting all, I didn't see Vladimir had
already posted about this.
I think the backup battery has died, which has probably upset it.
It comes up with a data out of range error at boot, plus time
& date is lost.
Regards option B72 expanded memory. Can someone check their system
for me and confirm. I have ROM: 16777216 and RAM: 33554432
Just want to double check that is correct, because when I loaded
FW: A14.06 the firmware went on ok, but power suite utilities
wouldnt install. And it should have done with B72 memory upgrade.
|
Re: E4411B forgotten its option(s)
Sorry for the duplicate posting all, I didn't see Vladimir had already posted about this.
I think the backup battery has died, which has probably upset it. It comes up with a data out of range error at boot, plus time & date is lost.
Regards option B72 expanded memory. Can someone check their system for me and confirm. I have ROM: 16777216 and RAM: 33554432
Just want to double check that is correct, because when I loaded FW: A14.06 the firmware went on ok, but power suite utilities wouldnt install. And it should have done with B72 memory upgrade.
|
Re: E4411B forgotten its option(s)
Thanks I'll give that a go. It was already working for me, thats the strange thing.
|
Re: VNA calibration kit to 50 GHz
thanks very much for all that great information; i'm moving up the learning curve now.
50 Ohms? Well actually i did mean a match load, but in waveguide, for the SOLT calibration.
As for the TRL (Thru, Reflet, Line) calibration in waveguide, i see the value of having the lambda/4 (90 degrees) Line. Clearly, difficult to make unless you have the spark eroder. I found an interesting report online about making these from NPL ? indicating the thickness of the line needs to be lambda/4 in the waveguide, which of course is longer than the free space wavelength, but the report is more about problems of TRL calibration at higher frequencies, from 26 GHz all the way up to 300 GHz.
Right now i'm interested in a calibration for WR42(WG-20) 18-26.5 GHz, probably in waveguide as that would be easier than coax. However, on longer timescales an interest all the way up to 50 GHz
Having the NI USB/GPIB interface adapter compensates someway for the lack modern electronics in the 30-year plus year old kit. However, one of the problems with this is the slow triggering of the sweeps if you want to do multiple sweeps quickly. I was wondering if if could replace the ASCII (GPIB 'FORM4')data transfer with the GPIB 'FORM1' binary data, which according to the 8510C manual allows for a faster data transfer. However, i tried this but it failed, so i have to get back to that to figure why, and if there is a route there to get more speed from the 8510C, but that's a whole new area for investigation.
Cheers, Neil
|
Re: E4411B forgotten its option(s)
Hello Ben,
I have made the post about the same problem just few days ago on
eevblog forum, you can check it here:
Description of all available options for ESA-L spectrum analyzers
(e.g. your 4411B) are described here:
Vladimir
Dne 14.07.2024 v 8:58 vee-dub565 via
groups.io napsal(a):
toggle quoted message
Show quoted text
I have a HP branded E4411B, if I press system-more-shiw system it
correctly identifies the following options
1DR
049
B72
If I then press system-more-more-licensing-show License then
there's nothing there.
I can confirm the color screen (option 049) is working, but the
narrow bandwidth (1DR) isn't, its still pegged at 1khz (@1MHz
span).
I tried re-entering the license code for 1DR, and it said it was
activated, and it then appeared in the show license screen... but
still didn't actually work.
I'm thinking I might have to reinstall the firmware, re-enter the
license codes and see if that works. Unless there's something else
I can try?
Ben
|
Re: E4411B forgotten its option(s)
Hi Ben, ? When checking for the 1DR option, did you meet the following condition: 'Only available in spans ≤5 MHz, sweep times ≥ 4 ms, and not usable with tracking generator on (Option 1DN)' ? With option B72 you could have the latest firmware version: A.14.06. ? Option 049 is a hardware option, it should be automatically detected and therefore work on power up...this is what you noticed as you described ? Yves ? I have a HP branded E4411B, if I press system-more-shiw system it correctly identifies the following options
1DR
049
B72
If I then press system-more-more-licensing-show License then there's nothing there.
I can confirm the color screen (option 049) is working, but the narrow bandwidth (1DR) isn't, its still pegged at 1khz (@1MHz span).
I tried re-entering the license code for 1DR, and it said it was activated, and it then appeared in the show license screen... but still didn't actually work.
I'm thinking I might have to reinstall the firmware, re-enter the license codes and see if that works. Unless there's something else I can try?
Ben
|
E4411B forgotten its option(s)
I have a HP branded E4411B, if I press system-more-shiw system it correctly identifies the following options
1DR
049
B72
If I then press system-more-more-licensing-show License then there's nothing there.
I can confirm the color screen (option 049) is working, but the narrow bandwidth (1DR) isn't, its still pegged at 1khz (@1MHz span).
I tried re-entering the license code for 1DR, and it said it was activated, and it then appeared in the show license screen... but still didn't actually work.
I'm thinking I might have to reinstall the firmware, re-enter the license codes and see if that works. Unless there's something else I can try?
Ben
|
Jinxie
fenugrec
LB6B Ingebrigt
Dr. David Kirkby, Kirkby Microwave Ltd