开云体育

I looked but couldnt find a source for download online, anyway its not really rocket science, the connector basically only controls a SPDT switch that switches the RF from the source to either the A or B coupler, there is no step attenuator or anything else to control in the box.
When replacing the mechanical with a solid state switch there are a few things you should keep in mind:

a.) the original switch terminates the unused arm in 50ohm, this condition needs to be fullfilled by your solid state switch as well !

b.) low frequency boundary
many solid state switches are based on GaAs and suffer from poor low frequency performance, pin switches are even worse, the solid state switch used in the 85046A for example exhibits poor RF characteristics below 100KHz

c.) isolation
the mechanical switches have fairly high isolation, get a datasheet of the Agilent 8763A (this is what they used) your Solid state switch needs to be equal or better !



marsac1212 <marsac1212@...> wrote:
Hello group:
Does anybody have the service manual of the 35677A S parameter test set?
All I need to know is what the pin out of the little connector on the
back?
I am trying to change the internal mechanical coaxial switch for a
solid state one and use the S parameter with my own LF network analyzer.






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Hello group:
Does anybody have the service manual of the 35677A S parameter test set?
All I need to know is what the pin out of the little connector on the
back?
I am trying to change the internal mechanical coaxial switch for a
solid state one and use the S parameter with my own LF network analyzer.

Since many people dont have the $ or the acess to good tools at work
i have taken the time to put together some recomendations for free or
low cost tools to make life easier ! be aware that most tools listed
are for non commercial use only !

1.) Ansoft Designer SV
Good subset of a commercial high $ package, covers layout and EM
Simulation (planar EM ), what im missing is a optimizer function but
has tune function to make up for it, good model database, lots of
models and substrates ! FREE

2.) EM3DS 2.5D EM Simulator, italian company has a freeware version
for download thats limited in size but still usefull.

3.) WIPL-D 3D EM Simulator, freeware version, full version
reasonably priced !

4.) Sonnet Lite
One of the best known names in EM Simulation, very easy to use
tool, several levels of licensing from free version over a $499
version to $$$$$, good tool !

5.) Genesis (Eagleware elanix)
Good starter tool , low cost , worth the money for possible trade
up against MWO !

6.) Quartus Webpack
FPGA Design tools, altera lately added almost all megafunctions
and devices except of a few very high end Stratix devices to the
webpack ! FREE Software

7.) XILINX Webpack
Free

A few words to Microwave CAE, every program is only as good as its
models and the circuit description you provide ! if you design an
amplifier and dont add your ground vias for the source terminals to
your netlist you will never see the light ! linear simulators also
never account for lids and housings effects like those are best
simulated with a EM Simulator tool !
Last but not least you get what you pay for however the advantages of
a high $ product will not show in the low frequency regions, if you
design 3 or 6GHz stuff Genesis will do you as well as ADS or MWO if
you get higher you will quickly feel the pain ! having driven almost
anything from Eagleware over ADS to MWO i can speak out of
experience.

Agreed, assuming the caqpacitors around the YIG tuning circuits are all up to spec. I've seen
one or two (non Ta) go low C.

Best,
-John



Alexander Whiplash wrote:

designing for low phasenoise never has been a trivial task, this especially goes for wideband oscilators such as YIGs, you also have to drive the shielding of the tuning lines almost to a excessive level.

J Forster <jfor@...> wrote: Agreed, assuming the caqpacitors around the YIG tuning circuits are all up to spec. I've seen
one or two (non Ta) go low C.

Best,
-John

Alexander Whiplash wrote:

--- Kuba Ober <ober.14@...> wrote:

...

I think that Bob Pease wrote a good article or two
about ripple rejection for
power supplies. Google for "what's all this ripple
rejection stuff anyway".
He shows how to do it with high voltage supplies
too.

There are many sources of noise that can get onto the
YIG tuning current. Power supply ripple will have
already been knocked down to a very low level in any
piece of HP gear that is working properly. Any
instrument will have a regulated power supply to power
the YIG driver circuits, and those supplies have very
little ripple on their output(s). The YIG driver
itself will have additional power supply rejection,
perhaps 80 dB or more.

The opamps and transistors and even some passive
components in the YIG driver will impose their noise
on the YIG tuning current and cause non-line related
noise. This is usually dealt with by careful design
and choice of components. Often an additional series
RC is placed across the coil to shunt noise currents
away. One can only take that so far before the tuning
performance or loop bandwidth is too much affected.
Units like the 8568 already have these "tricks" and I
don't think that there is any low hanging fruit to be
had in improving phase noise on it or comparable
instruments.

AW

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--- Kuba Ober <ober.14@...> wrote:

...

I think that Bob Pease wrote a good article or two
about ripple rejection for
power supplies. Google for "what's all this ripple
rejection stuff anyway".
He shows how to do it with high voltage supplies
too.

There are many sources of noise that can get onto the
YIG tuning current. Power supply ripple will have
already been knocked down to a very low level in any
piece of HP gear that is working properly. Any
instrument will have a regulated power supply to power
the YIG driver circuits, and those supplies have very
little ripple on their output(s). The YIG driver
itself will have additional power supply rejection,
perhaps 80 dB or more.

The opamps and transistors and even some passive
components in the YIG driver will impose their noise
on the YIG tuning current and cause non-line related
noise. This is usually dealt with by careful design
and choice of components. Often an additional series
RC is placed across the coil to shunt noise currents
away. One can only take that so far before the tuning
performance or loop bandwidth is too much affected.
Units like the 8568 already have these "tricks" and I
don't think that there is any low hanging fruit to be
had in improving phase noise on it or comparable
instruments.

AW



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On Saturday 17 November 2007, lothar baier wrote:

Building a good YIG based synthesizer has its challenges i admitt, first
problem is that usually YIGs are not as good in phasenoise to begin with,
next thing is that you have to design your drivers carefully and use really
low noise powersupplies and filtering,

I think that Bob Pease wrote a good article or two about ripple rejection for
power supplies. Google for "what's all this ripple rejection stuff anyway".
He shows how to do it with high voltage supplies too.

Cheers, Kuba

First off , are you sure that your 8482A is ok ? have you verified operation with another powermeter ? one offender on the 437 as well as other meters is the input connector, if the contacts wear out over time you get problems

Richard <kq6ef@...> wrote: I have a nice HP 437B Power Meter that is not working. It passes self
test OK, But the output from the Sensor (Good 8482A) displayed varies
all over the place. Even after zero preformed on Power meter. I
downloaded the Service manual from the Agilent web site. The manual is
missing what is called the service sheets. BD1 Block Diagrams and the
schematic sheets A3A,A3B,A3C,A4A,A4B,A4C. Anyone have these sheets in
PDF format.

I suspect a problem with the Analog board but would like more info
before I start poking around.

Thanks
Rich KQ6EF






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Do you have the sensor connected to a 50 ohm source (turned off) or pad?
Sometimes an open sensor input can make things jump around especially on
low ranges.

Best,
-John



Richard wrote:

I have a nice HP 437B Power Meter that is not working. It passes self
test OK, But the output from the Sensor (Good 8482A) displayed varies
all over the place. Even after zero preformed on Power meter. I
downloaded the Service manual from the Agilent web site. The manual is
missing what is called the service sheets. BD1 Block Diagrams and the
schematic sheets A3A,A3B,A3C,A4A,A4B,A4C. Anyone have these sheets in
PDF format.

I suspect a problem with the Analog board but would like more info
before I start poking around.

Thanks
Rich KQ6EF

Ok i know i sound like a broken record but i still consider the 70000
series the best choice if you need a good lab analyzer.
First off its a synthesized unit and you can piece it together and
expand it as needed, the lowest RF gets you to 2.9GHz and you can add
color display plus they are cheap !

If you only need 1.5GHz go for a 8568A or B need to go higher and dont
want to mess with modules buy a 8566 !

In my sincere opinion there is really no more excuse for somebody to
mess with a unit thats not synthesized, the difference in price is not
this much anymore and the performance and stability is just alot better.
I have worked with 8590 series analyzers and every one of them was able
to win a marathon :)
When HP build the 8590 they too the basic RF from the 8558 added a
processor board and display and thats it.

Tek 278 and 9 series are nice until you have to fix them, many
adjustments are done in software and the service software, altough it
is available requires lotus measure - good luck finding a copy !
the other downside is that there are many "prototype" units on ebay
that came out of tek and not even tek can service them anymore.

R+S is nice as well but expensive as hell even used, if you can afford
one or find one cheap go for it - you wont be disapointed.

just out of curiosity i would like to study the E4401 and see if it can be hacked to go to 3GHz, Agilent was good about putting features in their units and then limit them by Firmware corrections, i would not be surprised if the E4401 actually has all the RF to go to 3GHz but is just limited by firmware.
I wouldnt downgrade from a E44 to a 8590 the E44 as far as i know are at least synthesized, the problem with the downconverter approach is that you only have 0-1.5GHz to work with, in order to get a decent image rejection you would not be able to utilize the full band so you end up only beein able to look at a fairly narrow band.
70000 Systems to 2.9GHz are fairly cheap, or you can go for a 8560 or 8561

John Miles <jmiles@...> wrote:
What's your budget like? What features do you actually need?

If you are OK with your current model except for its upper tuning limit,
have you thought about building a downconverter for it? There may even be
frequency-offset and amplitude-offset features in the E4401B's firmware that
will adjust the display to account for an external oscillator and mixer.

If you want calibrated >1.5 GHz coverage in one box but don't want to spend
much money, you'll have to ask yourself what firmware features you're
willing to give up. Switching to an 8590-series analyzer would get you a
higher frequency limit and similar RF performance, but it's an older product
line with fewer bells and whistles. An 8560A or 8560E would be the next
step up in price, and actually a much-better piece of gear from an RF
standpoint, but again it would be missing some newer firmware features.

-- john, KE5FX

Hi.
A few years ago I had the opportunity to purchase a used E4401B
Spectrum analyzer which has worked well for me. I am now interested in
looking as signals between 1.5 and 2 GHz which this analyzer will not
handle. Any suggestions.
Thanks.

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What's your budget like? What features do you actually need?

If you are OK with your current model except for its upper tuning limit,
have you thought about building a downconverter for it? There may even be
frequency-offset and amplitude-offset features in the E4401B's firmware that
will adjust the display to account for an external oscillator and mixer.

If you want calibrated >1.5 GHz coverage in one box but don't want to spend
much money, you'll have to ask yourself what firmware features you're
willing to give up. Switching to an 8590-series analyzer would get you a
higher frequency limit and similar RF performance, but it's an older product
line with fewer bells and whistles. An 8560A or 8560E would be the next
step up in price, and actually a much-better piece of gear from an RF
standpoint, but again it would be missing some newer firmware features.

-- john, KE5FX

Hi.
A few years ago I had the opportunity to purchase a used E4401B
Spectrum analyzer which has worked well for me. I am now interested in
looking as signals between 1.5 and 2 GHz which this analyzer will not
handle. Any suggestions.
Thanks.

I have found a few FPGA kits that i used on previous projects, all of
them are working and in good condition, the reatail price is somewhere
from 199 to 499 i am asking $50ea OBO ! maybe someone can get some
good use out of them !

Here is what i got:
Altera Cyclone3 based NIOS Board (genuine Altera)
Altera MAX2 Kit in box w cables
Spartan3E kit w accesories in Box
contact me at microwaveengineer1968@... if you want one

the old saying - if the shoe fits wear it comes to mind :) but i wasnt actually aiming at you
Well, i dont have any dogs in this race either - i just recently got a 8753B which thank god has a good CRT, i have a 8757A with a bad CRT that i aquired specifically for this project, i dont own a 8640B either, a friend of mine volunteered one for the cause, what will happen to the unit after the work is done is not clear, maybe i will fix it up with a set of stailess steel "live forever" gears and create a replacement for the output amp and keep it around the lab.
I take on a project not because i want to make money or to get anything out of it but because im trying to help others and because i see a challenge in it thats all there are still quite a few people left who think this way as well - thank god !

Chuck Harris <cfharris@...> wrote:
Ok Lothar, that one was aimed directly at me, so I must respond!

I do lots of things without expectation of pay. I have coached
recreational soccer for many years. I help out with one of the
local youth orchestras. I am always available for school field trips.
I chaperon school events. I give electronics demonstrations at
my local schools. I make buttons that the schools give out as gifts
and rewards. I am involved in local zoning and planning issues that
affect my community.... I do construction, repair, and remodeling
work for friends and family... The list goes on and on. I spend
rather a lot of time not getting paid!

What I won't do, is go out and spend hundreds or thousands of
dollars, to buy instruments that I don't need or particularly want,
so I can give away my experience to help others. I need something
in the project to make it worthwhile for me to get involved.

A couple of examples which seem to have gotten a burr under your
saddle:

1) you came up with the idea to make an LCD vector display to replace
the display trays in a couple of HP scalar network analyzers. I
offered to help you by writing all of the programs necessary to make
your idea work... even though I don't own any examples of the
network analyzer. To make it possible for me to do this work I
said that I required someone to *give* me one of these network
analyzers (~ $2000) so I would have a platform on which to test my
software. That is a very cheap rate for a professional programmer
(which I am) to do your job. Instead, you went out and hired some
consultant, who was willing to work for an hourly rate... A rate
which certainly would have ended up in costing you many times more
than my bid!

2) 8640B's have been breaking delrin gears since they were introduced
40 years ago. I have been fixing these gears for much of that time.
I long ago gave up on 8640B's and moved on to synthesized signal
generators. But, in answer to the cry for help with broken gears,
I posted several notes on repair methods I had successfully used,
and offered to make available gear sets *at cost* if someone would
*give* me an 8640B 1/2/3 to use for measuring and testing the gears
(and as a minor compensation for my effort). Known working 8640B 1/2/3's
are available regularly on eBay for BIN prices in the $200 to $400
range (and they rarely sell at those prices). I did not require
a working 8640B. I figured this would be a nice way of getting the
job done, without me having to go out and buy an 8640B (which I don't
need) so I could measure it and give away the gears at cost.

I am a self employed Electrical Engineering Consultant. That is my *only*
source of income. That has been my only source of income for the last
25 years!

Electronics is not a hobby for me. It is my livelihood. I am not going
to tell you I don't enjoy messing with this old stuff. I do. That is
why I hang around these boards, and why I use this old test gear in my
consultancy. That is also why I offer to give away my professional
expertise, and only source of income, to help others with these projects.

But for me to do this, I need to keep my real boss happy, and that will
only happen if I don't *lose* money on these helpful ventures.

But, it seems to piss you off enough that you feel the need to lecture
me on being generous, helping society, etc...

Perhaps I should abandon these helpful efforts and go back to working
only with my professional customers?

-Chuck Harris

microwaveengineer1968 wrote:

One thing that comes up more and more often from people on this
newsgroup is the .... im not doing anything unlessi get paid for
it ! dont get me wrong i like money as much as anyone else and im not
this well off that i dont need any income but lets reflect and think
about it for a second....
If many of the great inventors would have shown this attitude than we
would be without a phone, light or electricity and the laws of basic
electronics would never been written!
Lets face it, many of the great inventors didnt start out because
they wanted to make money, they were tinkerers who liked to dabble
around and wanted to make things better, true in many cases wealth
and large companies came out of the original invention but it was not
the primary concern of the guy when he spend countless hours, days
and month sometimes years in the lab going trough trial after trial
facing the riddicule of friends family and sometimes even peers !
There are still many hams designing microwave circutry and publishing
detailed instructions on how to build their creations in magazines
for anyone to build without asking for any compensation.
Lets take for example Michael Kuhne DB6NT of germany who pioneered
many easy to build 10,24 and 47GHz designs, he did all the work in
his spare time, published many instructions and articles in DUBUS and
traveled from SHF convention to convention to promote his designs and
to answer questions from newcomers on how to build and improve those
designs, all on his own money without any commercial interest !
True sooner or later a company resulted out of it and today kuhne
electronic is good in business but it was not the primary idea of
michael when he started designing his stuff !
Sometimes we just need to step back and do things out of technical
interest without asking the $ question first, after all the good book
tells us that who seeks his rewards on this earth shall get their
rewards here and not in heaven !

---------------------------------
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Ok Lothar, that one was aimed directly at me, so I must respond!

I do lots of things without expectation of pay. I have coached
recreational soccer for many years. I help out with one of the
local youth orchestras. I am always available for school field trips.
I chaperon school events. I give electronics demonstrations at
my local schools. I make buttons that the schools give out as gifts
and rewards. I am involved in local zoning and planning issues that
affect my community.... I do construction, repair, and remodeling
work for friends and family... The list goes on and on. I spend
rather a lot of time not getting paid!

What I won't do, is go out and spend hundreds or thousands of
dollars, to buy instruments that I don't need or particularly want,
so I can give away my experience to help others. I need something
in the project to make it worthwhile for me to get involved.

A couple of examples which seem to have gotten a burr under your
saddle:

1) you came up with the idea to make an LCD vector display to replace
the display trays in a couple of HP scalar network analyzers. I
offered to help you by writing all of the programs necessary to make
your idea work... even though I don't own any examples of the
network analyzer. To make it possible for me to do this work I
said that I required someone to *give* me one of these network
analyzers (~ $2000) so I would have a platform on which to test my
software. That is a very cheap rate for a professional programmer
(which I am) to do your job. Instead, you went out and hired some
consultant, who was willing to work for an hourly rate... A rate
which certainly would have ended up in costing you many times more
than my bid!

2) 8640B's have been breaking delrin gears since they were introduced
40 years ago. I have been fixing these gears for much of that time.
I long ago gave up on 8640B's and moved on to synthesized signal
generators. But, in answer to the cry for help with broken gears,
I posted several notes on repair methods I had successfully used,
and offered to make available gear sets *at cost* if someone would
*give* me an 8640B 1/2/3 to use for measuring and testing the gears
(and as a minor compensation for my effort). Known working 8640B 1/2/3's
are available regularly on eBay for BIN prices in the $200 to $400
range (and they rarely sell at those prices). I did not require
a working 8640B. I figured this would be a nice way of getting the
job done, without me having to go out and buy an 8640B (which I don't
need) so I could measure it and give away the gears at cost.

I am a self employed Electrical Engineering Consultant. That is my *only*
source of income. That has been my only source of income for the last
25 years!

Electronics is not a hobby for me. It is my livelihood. I am not going
to tell you I don't enjoy messing with this old stuff. I do. That is
why I hang around these boards, and why I use this old test gear in my
consultancy. That is also why I offer to give away my professional
expertise, and only source of income, to help others with these projects.

But for me to do this, I need to keep my real boss happy, and that will
only happen if I don't *lose* money on these helpful ventures.

But, it seems to piss you off enough that you feel the need to lecture
me on being generous, helping society, etc...

Perhaps I should abandon these helpful efforts and go back to working
only with my professional customers?

-Chuck Harris


microwaveengineer1968 wrote:

Financial interest makes sense if you start a company and want to make money, if i would have the intension to start a business selling replacements for obsolete parts than for sure i would go broke after not even a year !
If you do something commercially you have to calculate your costs and then make a weight of what price the market supports, you have to put everything in the equation to make a profit which you have to make in order to make ends meet !
Things are not so if you just do something on the side for fun, normally you have a job that pays the bills, if you have a shop in the backyard or house than normally its paid for and the power and water bill are gonna get paid anyway, you dont have any employees and normally you already bought the machines and tools because you wanted to have them for a hobby, you also dont have the latest and greatest CNC controlled machines and a $100000 loan on your back which you needed to buy them !
Time is not an issue in a hobby shop , whether it takes you 10minutes to make a gear or 1hr, who cares you are not paying anyone to do it !
As long as you are doing it for fun its ok, lets see what else would i do if i wouldnt dabble around on machines or in my electronics lab ? probably sitting somewhere on a lake fishing or watching TV - if you want to put economics to it then you might not want to go fishing or watch tv either - how many $$$ you spend on fishing gear and licence ? then you sit around for hours on a lake to catch some fish that if you put economics to it you could have bought cheaper at a local market ! watching TV all you do is use electricity and spend a boatload on a new HDTV all without getting anything in return but entertainment - well entertainment for some people is to fix a old piece of equipment the main difference is that they are learning something as a side effect while the TV junkies only getting brain fried !


J Forster <jfor@...> wrote:
True, within limits. There is a big difference between working on
something with real upside potential and supporting something an
insrument which is reaching the end of it's service life. The former
makes financial sense, the latter does not. That does not mean it's not
worth doing, but just not for financial reasons. I'm specifically
thinking of the Tek 547 HV Transformer and the 8640 gears.

Best,
-John

microwaveengineer1968 wrote:

One thing that comes up more and more often from people on this
newsgroup is the .... im not doing anything unlessi get paid for
it ! dont get me wrong i like money as much as anyone else and im not
this well off that i dont need any income but lets reflect and think
about it for a second.... [snip]

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I used the stratix because i had a eval board for it on hand, for cost reasons i would not recommend this family ! Cyclone3 are pretty good and Lattice has low cost FPGAs with build in SERDES for high speed interface so i would go with one of those.

Who said that i have given up on the gears ? i havent , as a matter of fact one of my former motorola coworkers offered a 8640B with problems as a parts mule for just that purpose !
As soon as i finish painting and setting the machine up i will start on it

swingbyte <swingbyte@...> wrote:
I have read with some amusement and disappointment the responses you
received from your offer to make gears for people. I personally thought
it was a great offer and as soon as I need any gears I'll send you an
email. Never look a gift horse in the mouth!
After studying how a lot of rich people got rich I have discovered one
of the answers. They do what they enjoy doing without thinking of
getting rich. Entrepreneurs don't care about money as much as they care
about what they're doing to make it. HP started two guys doing what
they wanted to, Apple, Intel and most other super businesses all have
that in common. Certainly lots of people do jobs they don't like but
those that start from nothing usually make it doing something they
like. The hard part is knowing WHAT you like to do!!! Once you
discover that, you'll do it well and the rewards will come from being
the best.
Now after that little philosophy lesson ; I chose an 8565 over an 8569
because after watching ebay for several months, it seems that the extra
cost ( >in $AU 1000) was not justified. I can do digitisation - its
what I do for work and the ADCs available now are cheaper and faster and
everything else better. What is important to me is the RF capability
which is almost identical with option 100 on the 8565 - and outside my
current home construction and design capabilities!! So for $1000 less I
have an SA that does what I want rf-wise, I have already designed and
built a USB digitiser that I can use with it - more capable than the
8569 HPIB. But I'd like to have it all self contained in the one box -
so I will probably start to modify and hack the display section anyway.
Lothar - Thanks for the tip on LCD screens -I will look into that. The
Stratix chip is the one I was thinking of using. The reason I was
looking at high speed ADCs was to implement the rosenfell system HP uses.
Have fun!
See you later

Tim

microwaveengineer1968 wrote:

One thing that comes up more and more often from people on this
newsgroup is the .... im not doing anything unlessi get paid for
it ! dont get me wrong i like money as much as anyone else and im not
this well off that i dont need any income but lets reflect and think
about it for a second....
If many of the great inventors would have shown this attitude than we
would be without a phone, light or electricity and the laws of basic
electronics would never been written!
Lets face it, many of the great inventors didnt start out because
they wanted to make money, they were tinkerers who liked to dabble
around and wanted to make things better, true in many cases wealth
and large companies came out of the original invention but it was not
the primary concern of the guy when he spend countless hours, days
and month sometimes years in the lab going trough trial after trial
facing the riddicule of friends family and sometimes even peers !
There are still many hams designing microwave circutry and publishing
detailed instructions on how to build their creations in magazines
for anyone to build without asking for any compensation.
Lets take for example Michael Kuhne DB6NT of germany who pioneered
many easy to build 10,24 and 47GHz designs, he did all the work in
his spare time, published many instructions and articles in DUBUS and
traveled from SHF convention to convention to promote his designs and
to answer questions from newcomers on how to build and improve those
designs, all on his own money without any commercial interest !
True sooner or later a company resulted out of it and today kuhne
electronic is good in business but it was not the primary idea of
michael when he started designing his stuff !
Sometimes we just need to step back and do things out of technical
interest without asking the $ question first, after all the good book
tells us that who seeks his rewards on this earth shall get their
rewards here and not in heaven !

---------------------------------
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First off, I have no dog in this fight, but it seems to me used laptops, especially lower performance ones, are dirt cheap (>$100) these days. Why not a simple interface that uses the parallel or USB port and let the OS and laptop do
everything else. I would stay away from surplus LCDs because a continuing supply is problematic.

-John




lothar baier wrote: