Hi Ellud,
Can you tell me where one can obtain those wipers? I have a HP8640B that is missing 3 in total on the FM/RANGE switches. Your help will be much appreciated.
Donald?
PE1AHJ
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On 5/27/22 18:03, Matt Huszagh wrote: [209.85.216.53]:42889 is in an RBL This means your IP is blacklisted. is there a URL for remedy in the message? You can ask to be unblacklisted. It can be because your ISP allows too many bad customers sometimes.
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Re: Info Need on a RF FET for a Agilent E4438C signal generator
Its a common issue that you have a lot of excess gain at lower frequencies and then roll off at higher frequencies normally you can combat this by using resistive feedback between drain and gate , it will change your input impedance and drop gain at lower frequencies!
I think the best approach would be to find a MMIC that will work , i looked through offerings from different companies and nobody seems to make discretes in SOT89 anymore?
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Show quoted text
On May 28, 2022, at 03:13, Peter Hansen via groups.io <oz1lpr@...> wrote:
?
Hello Lothar I do not need 27dBm output. As it is not the final Fet. but I think the gain of the SHF-0189 is too little. It has around 20dB at low freq but only 10 to 12dB at 4Ghz. so I might need more gain
best regards Peter
The problem is finding a HEMT in SOT89 with 27dBm ,? used to those parts were made as driver or pre-driver for Power amps but this is all done with MMIC now ,? I remember seeing a GaN HEMT made by MACOM that was SOT89 but I believe it
was a 28V part !
?
As far as MMIC you can try the TQP7M9103 , its specified 400-4000MHz but you can use it at lower frequencies , this part does require external matching and only produces 13-14Db gain at 4GHz but can drive 27dBm
?
?
?
Hello Lothar It is a Fet. I does have a biasing system where is measures to drop over the Drain supply and then give bias to the Gate. The circuit does include matching network. I added a SHF-0189
in the circuit and it works but too low output for the High output option mounted. I can find traces on the Net over the M11X but only that it is a HFET.
The Fet is in the ALC loop so the amplitude is not really a problem as long as there is enough. I am afraid that is not the case. I wonder if a MMIC would work in the spot. I need one working
from 250khz to 4Ghz. the 4 to 6Ghz path is another board so the Part only need to go to 4Ghz.
sorry no schematics over the E44XX series
best regards Peter OZ1LPR
Do you have the schematic of the stage ?? if so can you share it ?
Let me render a few comments / thoughts on this :
- The first thing that needs to be established is whether the original part is a FET or a MMIC amplifier ,? you can tell by looking at the schematics , if there is a bias applied to both input and output
or just the output of the block , if bias is only applied to the output than its more than likely a MMIC amplifier if bias exists on both gate and drain than it’s a FET/HEMT !
- If the part is a FET than there should be matching as well as feedback networks present , since this is a stage operating over a wide frequency range resistive feedback between gate and drain will most
certainly be required in addition to lumped input and output matching circuits
- Based on the gain and output power estimate you provided as well as the frequency range of the generator I question the assessment of this part being a FET and rather assume this being a MMIC as it would
be hard to reach 20Db gain and 27dBm P1Db up to 4GHz
- If the part is a FET using matching networks it will be hard to find a drop in replacement , if you were to find a part in a SOT-89 package you will most certainly have to re-design the matching networks
as S-parameters will be different
?
?
?
I am rapiring a E4438C generator. There is a FET shorted in the output of chain of the 4Ghz path. The FET is called M11X1005. I can see traces of it existing
but no data. The SHF-0189Z can be used but not directly. The M11X1005 is using 6.5V on the drain but the SHF-0189 uses 8V and has higher gain and higher output.
Does anyone have either a M11X1005 Fet, data or a suitable repleacement.
I would assume something having 20dB of gain and +27dBm output.
best regards Peter
|
Re: Info Need on a RF FET for a Agilent E4438C signal generator
Hello Lothar I do not need 27dBm output. As it is not the final Fet. but I think the gain of the SHF-0189 is too little. It has around 20dB at low freq but only 10 to 12dB at 4Ghz. so I might need more gain
best regards Peter
The problem is finding a HEMT in SOT89 with 27dBm ,? used to those parts were made as driver or pre-driver for Power amps but this is all done with MMIC now ,? I remember seeing a GaN HEMT made by MACOM that was SOT89 but I believe it
was a 28V part !
?
As far as MMIC you can try the TQP7M9103 , its specified 400-4000MHz but you can use it at lower frequencies , this part does require external matching and only produces 13-14Db gain at 4GHz but can drive 27dBm
?
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]>
On Behalf Of Peter Hansen via groups.io
Sent: Thursday, May 26, 2022 11:23 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Info Need on a RF FET for a Agilent E4438C signal generator
?
Hello Lothar It is a Fet. I does have a biasing system where is measures to drop over the Drain supply and then give bias to the Gate. The circuit does include matching network. I added a SHF-0189
in the circuit and it works but too low output for the High output option mounted. I can find traces on the Net over the M11X but only that it is a HFET.
The Fet is in the ALC loop so the amplitude is not really a problem as long as there is enough. I am afraid that is not the case. I wonder if a MMIC would work in the spot. I need one working
from 250khz to 4Ghz. the 4 to 6Ghz path is another board so the Part only need to go to 4Ghz.
sorry no schematics over the E44XX series
best regards Peter OZ1LPR
Do you have the schematic of the stage ?? if so can you share it ?
Let me render a few comments / thoughts on this :
- The first thing that needs to be established is whether the original part is a FET or a MMIC amplifier ,? you can tell by looking at the schematics , if there is a bias applied to both input and output
or just the output of the block , if bias is only applied to the output than its more than likely a MMIC amplifier if bias exists on both gate and drain than it’s a FET/HEMT !
- If the part is a FET than there should be matching as well as feedback networks present , since this is a stage operating over a wide frequency range resistive feedback between gate and drain will most
certainly be required in addition to lumped input and output matching circuits
- Based on the gain and output power estimate you provided as well as the frequency range of the generator I question the assessment of this part being a FET and rather assume this being a MMIC as it would
be hard to reach 20Db gain and 27dBm P1Db up to 4GHz
- If the part is a FET using matching networks it will be hard to find a drop in replacement , if you were to find a part in a SOT-89 package you will most certainly have to re-design the matching networks
as S-parameters will be different
?
?
?
I am rapiring a E4438C generator. There is a FET shorted in the output of chain of the 4Ghz path. The FET is called M11X1005. I can see traces of it existing
but no data. The SHF-0189Z can be used but not directly. The M11X1005 is using 6.5V on the drain but the SHF-0189 uses 8V and has higher gain and higher output.
Does anyone have either a M11X1005 Fet, data or a suitable repleacement.
I would assume something having 20dB of gain and +27dBm output.
best regards Peter
|
Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
As far as I am aware, the port extension feature only adds pure phase. You enter a delay parameter, or a physical length + velocity factor. I don't recall ever seeing any option to dial in any other parameters (e.g., loss), but that may be due to my rarely using port extensions, and then only to shift the reference plane by tiny amounts.
--Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
toggle quoted message
Show quoted text
On 5/27/2022 18:12, Dave McGuire wrote: On 5/27/22 19:50, Karin Johnson wrote:
This is probably related to the storage of the cal correction factors in the memory of the 8753C.? Is it via floating point numbers, or integer numbers? ? I don't know about the 8753 in particular, but for the 8510, for example, the calibration correction factors are floating point numbers that are the coefficients for the third-order polynomial that describes the curve (C or L) in the frequency domain for the calibration standard in question.? I'd be very surprised if the 8753 did it any differently.
? Dave Kirkby should be able to chime in on this with more information.
??????????? -Dave
|
Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
On 5/27/22 19:50, Karin Johnson wrote: This is probably related to the storage of the cal correction factors in the memory of the 8753C.? Is it via floating point numbers, or integer numbers? I don't know about the 8753 in particular, but for the 8510, for example, the calibration correction factors are floating point numbers that are the coefficients for the third-order polynomial that describes the curve (C or L) in the frequency domain for the calibration standard in question. I'd be very surprised if the 8753 did it any differently. Dave Kirkby should be able to chime in on this with more information. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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On 5/27/22 20:03, Matt Huszagh wrote: I'm not really sure where to send this, but I figured some people on
this list might have an idea.
I sent an email to curator@... a few months ago to get access
to some software on their site. I never heard back. I reached out again
just now and received a response that my email had been blocked as junk
mail. I actually don't need the software anymore - found it on the
terrific hp-series300.net, but I'm concerned that my emails are being
flagged. Has anyone experienced this?
There was nothing suspicious about my original email or the follow-up. I
also don't use a graphical email client, so there are no funny images or
attachments in the email; just plain text. This is the blocked response
I got back.
** Message blocked **
Your message to curator@... has been blocked. See technical details below for more information.
The response from the remote server was:
550 "JunkMail rejected - mail-pj1-f53.google.com [209.85.216.53]:42889 is in an RBL: " David Collins is currently the curator of hpmuseum.net. He's on the VintHPCom mailing list; if you post there he'll see it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
I'm not really sure where to send this, but I figured some people on
this list might have an idea.
I sent an email to curator@... a few months ago to get access
to some software on their site. I never heard back. I reached out again
just now and received a response that my email had been blocked as junk
mail. I actually don't need the software anymore - found it on the
terrific hp-series300.net, but I'm concerned that my emails are being
flagged. Has anyone experienced this?
There was nothing suspicious about my original email or the follow-up. I
also don't use a graphical email client, so there are no funny images or
attachments in the email; just plain text. This is the blocked response
I got back.
** Message blocked **
Your message to curator@... has been blocked. See technical details below for more information.
The response from the remote server was:
550 "JunkMail rejected - mail-pj1-f53.google.com [209.85.216.53]:42889 is in an RBL: "
Matt
|
Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
I realized a couple of hours after sending the initial post, that I was incorrect with associating Calibration with the Port Extensions.
Here is, I hope a better explanation of what I am trying to do.
First off the measurement frequency is 14 MHz.? So not too beyond the capability of the 8753C.
I want to place the measurement plane at the end of a 100 foot length of RG213.? So I place the SOL standards, one at a time at the
end of the cable.? Supposedly the 8753C measurement plane is now at the end of the cable.
Now I can take S11 measurements relative to the measurement plane at the end of the cable.? My question should have been
" Is there a limit in terms of how long a cable can be before this calibration technique fails."
This is probably related to the storage of the cal correction factors in the memory of the 8753C.? Is it via floating point numbers, or integer numbers?
How large or small can the calibration correction values be???
I seem to be able to obtain valid data using this technique, but wanted to ask on the Keysight forum with some of the folks who actually designed
the instrument.? I think Dr. Joel it still active there.?
My rant about not being able to login to the Keysight forums still exists.? It seems their login/validation screen seems broken.
At one time I had an account over there but they have seemed to have changed the supporting vendor for the forum sites.
As always,
Regards,
Karin Johnson
|
Re: LCD replacement for vector displays
On Fri, May 27, 2022 at 2:56 PM Bill Higdon via <willard561= [email protected]> wrote: This might open up up some possibilities for some of the vector display instruments
This appears to go in the other direction, e.g. it allows using games emulated with a custom version of the MAME arcade emulator to be displayed on an authentic old-style vector monitor._._,_._,_
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Running HP-UX 9 remotely from a Linux host
Hello,
I have an HP 382 that I use to control an HP 3048A system. Currently, I
have a disk image containing an HP BASIC 6.3 installation that I serve
to the 382 with HPDrive. This works, but there are two main pain points:
1. Transferring files between the 382 and my modern Linux machine is
cumbersome. HPDir allows me to extract files from a disk image
containing an LIF filesystem. However, my disk image is formatted for
HFS. I could also serve an LIF-formatted drive and copy between them,
but still this is a bit painful (I won't go into the details, but happy
to explain further if someone wants).
2. Using my 382 system requires pulling out a VGA monitor and keyboard
that I only use for this purpose. I'd much prefer to run everything from
my Linux machine.
I expect that if I used HP-UX 9 instead of HP BASIC I could easily
resolve the first problem. HP-UX supports FTP that should make file
transfer over a network simple.
I'm curious about using HP VUE to also resolve the second annoyance. HP
VUE targets the X window system and allows remote connection over a
network. So, in principle this is simple, but with the 30 year time
gap between an implementation of the X window system for HP-UX 9 and the
one running on my current Linux machine, I expect there will be a few
challenges to sort out.
There's an old forum thread that goes into some of the difficulties that
arise. See
and linked threads.
Does anyone use this workflow or something similar? If so, would you be
able to provide any pointers about getting it running? I'm going to
investigate this myself either way, but if someone has already addressed
some of the challenges that pop up, I'd prefer not to duplicate the
troubleshooting time.
Thanks!
Matt
|
LCD replacement for vector displays
This might open up up some possibilities for some of the vector display instruments
https://hackaday.com/2022/05/26/color-vector-display-controller-brings-arcade-classics-back-to-life/
|
Re: checking line module setting for 110V / 220V
I used a little hook like the ones you can buy at a hardware store and glued it into a small plastic rod
?
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Show quoted text
From: [email protected] < [email protected]>
On Behalf Of ??????? ????? via groups.io
Sent: Friday, May 27, 2022 1:29 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] checking line module setting for 110V / 220V
?
there is small hole on card
use a hook and pull, swinging the card from side to side
There is no locking except fuse lever
|
Re: checking line module setting for 110V / 220V
Most of my (many) items of HP gear arrived in the UK from the USA so
I've met this issue a few times, what I do is:
Check that nothing is bent/twisted, take a pair of thin(ish) nosed
pliers - with serrated jaws - grasp the back edge of board in the
centre and with a silent prayer to the Gods of Incredibly Thin PCBs
pull straight and firmly and out it will come!
Adrian
On 27/05/2022 19:19, tom_iphi via
groups.io wrote:
toggle quoted message
Show quoted text
Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting
it to mains and powering it up.
The line module seems pretty much standard across the HP equipment
of that age.
A lever next to the mains socket removes the fuse. Below the lever
there is a little pcb plug that allows to change the voltage
setting.
Is there a trick to remove that card? It seems to be stuck. Is
there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
Re: checking line module setting for 110V / 220V
Tom,
Give it a tug - they’re in there pretty tight! I just pulled one to be sure and unless someone has damaged something it should pull straight out.? Steve K.
toggle quoted message
Show quoted text
On May 27, 2022, at 1:20 PM, tom_iphi via groups.io <iphi@...> wrote:
?Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting it to mains and powering it up.
The line module seems pretty much standard across the HP equipment of that age.
A lever next to the mains socket removes the fuse. Below the lever there is a little pcb plug that allows to change the voltage setting.
Is there a trick to remove that card? It seems to be stuck. Is there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
Re: checking line module setting for 110V / 220V
there is small hole on card use a hook and pull, swinging the card from side to side There is no locking except fuse lever
|
Re: checking line module setting for 110V / 220V
As I recall, there should be a little hole in the small PC Board. Hook it with a Small Screwdriver or anything else you can hook it with, and pull. Regards Bill Lauchlan ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of tom_iphi via groups.io
Sent: Friday, May 27, 2022 2:20 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] checking line module setting for 110V / 220V? Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting it to mains and powering it up.
The line module seems pretty much standard across the HP equipment of that age.
A lever next to the mains socket removes the fuse. Below the lever there is a little pcb plug that allows to change the voltage setting.
Is there a trick to remove that card? It seems to be stuck. Is there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
checking line module setting for 110V / 220V
Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting it to mains and powering it up.
The line module seems pretty much standard across the HP equipment of that age.
A lever next to the mains socket removes the fuse. Below the lever there is a little pcb plug that allows to change the voltage setting.
Is there a trick to remove that card? It seems to be stuck. Is there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
Re: 8662A - a warning about dangerous service directions
Hi George,
toggle quoted message
Show quoted text
On Fri, May 27, 2022 at 05:04 AM, george edmonds wrote:
Hi Dmitry
?
Whilst I share your concerns may I say that the HP fault finding guidance is based around having a set of their 8622A or 8623A PCB card extenders available.Under most circumstances using the card extenders will leave the power supply loads in place and limit the extent to which the voltages can rise.
This is not an issue with the loads being disconnected. When the overvoltage condition exists, HP advice is to bypass the safety shutdown and measure the voltages. With the normal loads in place, peak excursions were sufficient to damage multiple components in the -40 V regulator. Trusting the service manual in this case was clearly wrong.
?
?
The biggest problem that I see with most SMPSU repairs is a lack of understanding as to how they work and the limitations placed on their control circuitry.? I would suggest reading the excellent posting by Dave G8KBV in the previous 8622A repair thread, the key point is only one voltage control loop.
I know fairly well how 8662A switching supply works, not my first time fixing one. First time I ran into the high voltage shutdown, though. If the service manual was silent on the issue, I'd figure out a way to capture the transients, just like I suggested in the original post. But I tend to trust the service manual troubleshooting guidance. It did feel wrong to bypass the shut-off, but if HP says "do it", you do it. At least the first time :)
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Re: Info Need on a RF FET for a Agilent E4438C signal generator
I used this one for a similar job, worked fine, didn't need to modify the matching networks,
You won't get 20dB gain out of it but perhaps you can get along with less... Don't ask me where you can get this critter from, nowadays...
|
Dave McGuire
Dmitry Teytelman