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  1. HP-Agilent-Keysight-Equipment
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Date
Re: HP 3852a extended memory modules info

 

A second thing is to consider whether you are replacing CMOS with TTL compatible CMOS.? That T (TTL compatible) makes a difference in the part name.

Harvey

On 7/15/2024 3:28 PM, Wilko Bulte wrote:
Be careful while exchanging different TTL families. Not always it works, not always is a faster logic family working when replacing an older TTL family. This can lead to new problems which are very hard to debug.

Don't ask me how I know...

Wilko
Re: VNA calibration kit to 50 GHz

 

Yes, why indeed the extra ¦Ë/8 and 3¦Ë/8 waveguide sections, from a waveguide cal kit user? Like you, i have shorts and the loads, and just need the ¦Ë/4 spacer for a TRL cal, but why these other two sections?
Re: HP free e-book

 

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Agreed, 6 Layer Cards instead of 4 Layer Cards. Grin.

?

?

My wife is actually very understanding. We both have our hobbies. There are no disagreements about supplies for either hobby.

?

The way we see it, hobbies keep us happy. They also keep our minds continuously busy and happy people like to stay with each other longer ¨C 46+ Years and going strong.

?

Ross

?

From: [email protected] <[email protected]> On Behalf Of Tom via Metronet
Sent: Monday, July 15, 2024 12:43 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book

?

Yep. Do it your way, over-engineer as much as you want, and the more useless, the better. If the wife won¡¯t approve your expense account, tell her at least you aren¡¯t chasing skirts in bars.

?

Tom Holmes, N8ZM

?

From: [email protected] <[email protected]> On Behalf Of si_emi_01 via groups.io
Sent: Monday, July 15, 2024 2:27 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book

?

Well said.

?

I too have found renewed joy in Retirement. I have the time to design anything I want, to my specifications, I can layout the PCBs the way I want to my satisfaction, build and test, and just have fun¡­ ??ALL on MY SCHEDULE.

?

Yup, totally useless time spent.

?

Highly recommended.

?

Ross

?

From: [email protected] <[email protected]> On Behalf Of Gianni Becattini via groups.io
Sent: Sunday, July 14, 2024 10:56 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book

?

Thanks to you for your attention!

?

This activity gives me an unreasonable joy. Yes, I spent my life in electronics, but in the last 15 years I was more a manager than a technician, and however the worries of a company on your shoulders much ¡°dilute¡± the pleasure.

?

Now that I am retired, restoring and documenting this forgot equipment, I found again the enthusiasm of when I was fifteen, amplified by the fact that what I do is absolutely useless¡­ ?(this is a fundamental component of pleasure¡­)

?

?????

Thanks!
Re: HP free e-book

 

Right!!!

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire
Sent: Monday, July 15, 2024 12:36 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book


"Useless". It's called "living" and doing what you want to with your life, and personally I can't think of anything more useful to a person than that. That's what life IS.

By all means, go forth and hack on tech, and love every minute of it.

-Dave

On July 15, 2024 2:27:03 PM "si_emi_01 via groups.io" <wellington@...> wrote:
Well said.



I too have found renewed joy in Retirement. I have the time to design anything I want, to my specifications, I can layout the PCBs the way I want to my satisfaction, build and test, and just have fun¡­ ALL on MY SCHEDULE.



Yup, totally useless time spent.



Highly recommended.



Ross



From: [email protected] <[email protected]> On Behalf Of Gianni Becattini via groups.io
Sent: Sunday, July 14, 2024 10:56 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book



Thanks to you for your attention!



This activity gives me an unreasonable joy. Yes, I spent my life in electronics, but in the last 15 years I was more a manager than a technician, and however the worries of a company on your shoulders much ¡°dilute¡± the pleasure.



Now that I am retired, restoring and documenting this forgot equipment, I found again the enthusiasm of when I was fifteen, amplified by the fact that what I do is absolutely useless¡­ (this is a fundamental component of pleasure¡­)



?????

Thanks!






--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 83590A - Help understanding frequency band switching

 

Tony, have you read the theory of operation for the 83590A? In particular the frequency tuning section?
The band nos. correspond to the harmonic multiplication that occurs in the YTM.
Band 1,? ?2.0-7.7GHz? no multiplication, 2.0-? ? ? ? ? ? ? ? ? 7.7GHz output. The YTM is not used ,? ? ? ? ? ? ? ? YIG only.
Band 2,? ?3.5-6.75GHz YIG tuning,?
? ? ? ? ? ? ?x2 multiplication, YTM output 13.5GHz.
Band 3,? ?4.5-6.67GHz. YIG tuning,?
? ? ? ? ? ? ?x3 multiplication, YTM output?
? ? ? ? ? ? ?12.5-20GHz.

Band 0 would be for 10MHz to 2.4GHz output on several plugins. It is a down converted band.
Band 4 would be for 18.6-26.5GHz output on a few plugins. As you surmised.
There is band overlap so that when you have a wider sweep near a band edge the sweeper can pick the upper or lower tuning band, so that it only has to sweep one band, not across 2 bands. It can sweep across all three (or 4 bands, or more if needed). There is a slight pause in the sweep to allow for band edge crossing delays and settling time, when you sweep across band edges.
Don Bitters?
Re: HP free e-book

 

Or buying more shoes ?
Re: HP 3852a extended memory modules info

 

Be careful while exchanging different TTL families. Not always it works, not always is a faster logic family working when replacing an older TTL family. This can lead to new problems which are very hard to debug.

Don't ask me how I know...

Wilko
Re: HP free e-book

 

¿ªÔÆÌåÓý

Yep. Do it your way, over-engineer as much as you want, and the more useless, the better. If the wife won¡¯t approve your expense account, tell her at least you aren¡¯t chasing skirts in bars.

?

Tom Holmes, N8ZM

?

From: [email protected] <[email protected]> On Behalf Of si_emi_01 via groups.io
Sent: Monday, July 15, 2024 2:27 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book

?

Well said.

?

I too have found renewed joy in Retirement. I have the time to design anything I want, to my specifications, I can layout the PCBs the way I want to my satisfaction, build and test, and just have fun¡­ ??ALL on MY SCHEDULE.

?

Yup, totally useless time spent.

?

Highly recommended.

?

Ross

?

From: [email protected] <[email protected]> On Behalf Of Gianni Becattini via groups.io
Sent: Sunday, July 14, 2024 10:56 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book

?

Thanks to you for your attention!

?

This activity gives me an unreasonable joy. Yes, I spent my life in electronics, but in the last 15 years I was more a manager than a technician, and however the worries of a company on your shoulders much ¡°dilute¡± the pleasure.

?

Now that I am retired, restoring and documenting this forgot equipment, I found again the enthusiasm of when I was fifteen, amplified by the fact that what I do is absolutely useless¡­ ?(this is a fundamental component of pleasure¡­)

?

?????

Thanks!
Re: HP free e-book

 

"Useless". It's called "living" and doing what you want to with your life, and personally I can't think of anything more useful to a person than that. That's what life IS.

By all means, go forth and hack on tech, and love every minute of it.

-Dave

On July 15, 2024 2:27:03 PM "si_emi_01 via groups.io" <wellington@...> wrote:
Well said.



I too have found renewed joy in Retirement. I have the time to design anything I want, to my specifications, I can layout the PCBs the way I want to my satisfaction, build and test, and just have fun¡­ ALL on MY SCHEDULE.



Yup, totally useless time spent.



Highly recommended.



Ross



From: [email protected] <[email protected]> On Behalf Of Gianni Becattini via groups.io
Sent: Sunday, July 14, 2024 10:56 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book



Thanks to you for your attention!



This activity gives me an unreasonable joy. Yes, I spent my life in electronics, but in the last 15 years I was more a manager than a technician, and however the worries of a company on your shoulders much ¡°dilute¡± the pleasure.



Now that I am retired, restoring and documenting this forgot equipment, I found again the enthusiasm of when I was fifteen, amplified by the fact that what I do is absolutely useless¡­ (this is a fundamental component of pleasure¡­)



?????

Thanks!






--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP free e-book

 

¿ªÔÆÌåÓý

Well said.

?

I too have found renewed joy in Retirement. I have the time to design anything I want, to my specifications, I can layout the PCBs the way I want to my satisfaction, build and test, and just have fun¡­ ??ALL on MY SCHEDULE.

?

Yup, totally useless time spent.

?

Highly recommended.

?

Ross

?

From: [email protected] <[email protected]> On Behalf Of Gianni Becattini via groups.io
Sent: Sunday, July 14, 2024 10:56 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP free e-book

?

Thanks to you for your attention!

?

This activity gives me an unreasonable joy. Yes, I spent my life in electronics, but in the last 15 years I was more a manager than a technician, and however the worries of a company on your shoulders much ¡°dilute¡± the pleasure.

?

Now that I am retired, restoring and documenting this forgot equipment, I found again the enthusiasm of when I was fifteen, amplified by the fact that what I do is absolutely useless¡­ ?(this is a fundamental component of pleasure¡­)

?

?????

Thanks!
Re: VNA calibration kit to 50 GHz

 

Well, you got me, I don't know from experience but can guess that, in order to cover the full waveguide band, you need some varying lengths. Also there may be specific calibration routines that used the specified length to develop correction factors. I would like to hear why from an actual waveguide cal kit user. When I was doing waveguide on the ANA (8510C) I did not have a cal kit so used my own waveguide shorts and loads, not the best way. Got good results, however!? Jeff

In a message dated 7/15/2024 12:09:20 PM Eastern Standard Time, salmon.na@... writes:
?

thanks, that's good. But with TRL in waveguide you only need a thru (direction connection of waveguide ends), a reflect, and ¦Ë/4 line, then why do you need the ¦Ë/8 and 3¦Ë/8 waveguide sections? I'm guessing this might be for a LRL calibration ie ¦Ë/8 line, reflect, 3¦Ë/8 line. If that is the case, then why would you need a LRL calibration, if you already have a TRL calibration. There must be a good reason for having all three (¦Ë/8, ?¦Ë/4, 3¦Ë/8 waveguide sections) as you see these being sold together, i'm just wonding how you make best use of these/


many thanks, Neil
Re: VNA calibration kit to 50 GHz

 

thanks, that's good. But with TRL in waveguide you only need a thru (direction connection of waveguide ends), a reflect, and ¦Ë/4 line, then why do you need the ¦Ë/8 and 3¦Ë/8 waveguide sections? I'm guessing this might be for a LRL calibration ie ¦Ë/8 line, reflect, 3¦Ë/8 line. If that is the case, then why would you need a LRL calibration, if you already have a TRL calibration. There must be a good reason for having all three (¦Ë/8, ?¦Ë/4, 3¦Ë/8 waveguide sections) as you see these being sold together, i'm just wonding how you make best use of these/

many thanks, Neil
Re: HP free e-book

 

On 7/15/24 00:56, Gianni Becattini via groups.io wrote:
Thanks to you for your attention!
This activity gives me an unreasonable joy. Yes, I spent my life in electronics, but in the last 15 years I was more a manager than a technician, and however the worries of a company on your shoulders much ¡°dilute¡± the pleasure.
Now that I am retired, restoring and documenting this forgot equipment, I found again the enthusiasm of when I was fifteen, amplified by the fact that what I do is absolutely useless¡­ ?(this is a fundamental component of pleasure¡­)
I hope this does not diminish your pleasure, but documenting and preserving history is never useless.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: VNA calibration kit to 50 GHz

 

I believe that the 1/8 & 3/8 sections are only for waveguide, the SOLT is coax. Really hard to make a meaningful open in waveguide as it radiates and has a return loss of about 10 dB, not 0 dB, also improper reflection phase, not 0 degrees (or close) like a shielded open. J. Kruth
?
I can see for the TRL calibration if the T is a direction connection between the connectors ends, line L is a ¦Ë/4 section wavelength, and for the SOLT you need a short, an open and a load, so why the interest ¦Ë/8 and 3¦Ë/8 sections for calibration? Are there other calibration routines which use these? Just wondering, as if i buy some of these bit, as might as well get those which will enable a good calibration, even on a budget.

many thanks, Neil

Re: VNA calibration kit to 50 GHz

 

I can see for the TRL calibration if the T is a direction connection between the connectors ends, line L is a ¦Ë/4 section wavelength, and for the SOLT you need a short, an open and a load, so why the interest ¦Ë/8 and 3¦Ë/8 sections for calibration? Are there other calibration routines which use these? Just wondering, as if i buy some of these bit, as might as well get those which will enable a good calibration, even on a budget.

many thanks, Neil
Re: HP 3852a extended memory modules info

 

74LS245 is the basic model but uses more current with up to 90mA per unit and 12ns propagation delay - we have 5 so up to 450mA
74HCT245 CMOS version 70mA max and 15ns propagation delay - 300mA for 5 unit. delta 150mA
74AHCT245 FAST CMOS 75mA max and 8.7ns propagation delay -? 375mA delta 75mA from LS?
74ACT245 FAST CMOS 50mAmax and 8ns propagation? delay. - 250mA so 200mA less than LS?

All have same pinout. ACT is best from a current usage versus speed. Any of these will work but HCT is slower than LS in theory . In practice it might not matter at all and will be the same.

Maciej

Re: 8702A service manual

 

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I believe the 8702A is an 8753C with different firmware (display is color).? Find the video, pick it off and feed it into a Gonbes video converter (or similar) from eBay.? You may need to add an LM1881 sync seperator depending on which scan converter you choose.

Jim

From: [email protected] <[email protected]> on behalf of James via groups.io <goodcom2354@...>
Sent: Monday, July 15, 2024 6:40 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8702A service manual
?
Hi,
I don¡¯t know of a dedicated service manual for the 8702A. These units are essentially a 8753A with modified firmware for fibre testing with the additional light bridge. ?
There are 8753A service manuals online.?
After having a search, it appears that connecting a external monitor won¡¯t be easy. You may have to use something like a Simmconn Lab LCD conversion to get external monitor capabilities.
James Goodwin
Re: 8702A service manual

 

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Hi,
I don¡¯t know of a dedicated service manual for the 8702A. These units are essentially a 8753A with modified firmware for fibre testing with the additional light bridge. ?
There are 8753A service manuals online.?
After having a search, it appears that connecting a external monitor won¡¯t be easy. You may have to use something like a Simmconn Lab LCD conversion to get external monitor capabilities.
James Goodwin
HP 83590A - Help understanding frequency band switching

 

Hi,

I'm trying to work my way through the band switch logic of the 83590A RF plugin, and understand how it works prior to troubleshooting my unit.

It's quite complex but I can more-or-less follow it now. I'm a bit confused by some bits of the manual however so seeking clarification from the experts here!

The 83590A has a span of 2GHz to 20GHz delivered, as described in the manual, by tuning the YIG over three frequency bands:

2.0-7.7GHz (band 1)
3.5-6.75GHz (band 2)
4.5-6.67HGz (band3)

Looking at the band switch comparator on the sweep control board, the schematic has unloaded jumpers for "band 0" and "band 4" (see attached, pink highlight). I assume this is a standard circuit used across many plugins, and accommodates plugins with a wider frequency range with more bands? (like the 93592C for instance).

My first question is about "band 2" which is valid for this plugin but does not seem to be referenced in the bandswitch comparator circuit at all? (see attached, yellow highlight) Is there something special about "band 2"?



My second question is about Band 0 - at some points in the manual this is referred to - but this band is apparently not used in this plugin. I assume that this is either an oversight or error in the 83590A manual? It must have been a bit of a nightmare keeping all of the plugin documentation consistent when there were many combinations of frequency ranges - so I can believe this is a documentation error.



thanks

Tony
Re: Pulling out Boards

 

Many thanks, guys.
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