开云体育

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: HP 5086-7906 YTO

 

开云体育

A lot of them tune at 20 MHz/mA, so 100 mA may not have been enough.? I'd crank the main coil current up to 200 mA and see if that makes a difference.

?

-- john, KE5FX

?

From: [email protected] [mailto:[email protected]] On Behalf Of piecolav via groups.io
Sent: Monday, August 29, 2022 10:09 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 5086-7906 YTO

?

Today I tried to power the YTO 5086-7906, that of the 8563E, externally to the analyzer.
Granted that I have checked all the components of the small PCB on the oscillator, I noticed that the current absorbed values are:
+5 VDC, 98 mA
+15 VDC, 28 mA
-15VDC, 1mA
I also powered the main coil (pins 5 and 6) with a current from 50 to 100 mA, not knowing the exact operating value.
By adjusting the latter, the value read on the power meter does not change: about -28 dBm. Instead of the expected +10 dBm!
Now I'm sure the YTO is broken.

Re: HP 5086-7906 YTO

 

Hi Ed, unfortunately the RF signal output connection is via a female SMA connector. The YTO 5086-7906 is built very well, as per HP tradition, and it is also easy to open it, having a little foresight and in a non-dusty environment.
I opened one of the two, broken, that I have, to check if inside there were any burn marks or gold wires, welded with the wire bonding technique, interrupted. Unfortunately, even with the microscope I did not find anything abnormal.
Opening the YTO is very easy: just remove the locked rear cover and unscrew the rear spacers.
The oscillator thus opens in two parts, the rear contains the two windings of the MAIN COIL and the FM COIL and the front contains all the electronic circuitry I believe on a sapphire substrate, including the ball in yttrium iron garnet.
Much of what I know I learned from reading the Keysight forum thread at: https://community.keysight.com/forums/s/question/0D52L00005IdorQSAR/hp-8560e-spectrum-analyzer-yig-yto- a11-questionproblem
Re: Hp8640b (Parts)

 

I have several parts units I bought to keep mine that I used to teach with going. Not needed any longer, so if you need something, get in touch and I can pull the part out. I suspect the fingers are gone on the bandswitch, which is why these were sold as parts. Otherwise complete.
Jeff Kruth
kmec@...

In a message dated 8/30/2022 11:35:15 AM Eastern Standard Time, ktx85@... writes:
?

Ok....is there someplace I can find parts to repair mine....
?
I am not the original owner...how can I tell if they have gone to far and done any damage to the VFO ?
?
?
-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/30/22 9:53 AM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
?

The eight-turn stop is essential.? If you go more than eight turns and smash the back end of the cavity, the VFO is irreparably ruined.

I don’t know what is safe to degrease that plastic.

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 4:11 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

?

?

-------- Original message --------

From: "Dave ." <ktx85@...>

Date: 8/29/22 6:07 PM (GMT-06:00)

Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

?

I haven't posted very many times and tried to resend the pictures...

?

?

-------- Original message --------

From: Dave Wise <david_wise@...>

Date: 8/29/22 6:00 PM (GMT-06:00)

Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You’ll need to free them up, degrease with something that doesn’t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

?
Re: Hp8640b

 

开云体育

Ok....is there someplace I can find parts to repair mine....

I am not the original owner...how can I tell if they have gone to far and done any damage to the VFO ?


-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/30/22 9:53 AM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

The eight-turn stop is essential.? If you go more than eight turns and smash the back end of the cavity, the VFO is irreparably ruined.

I don’t know what is safe to degrease that plastic.

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 4:11 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

?

?

-------- Original message --------

From: "Dave ." <ktx85@...>

Date: 8/29/22 6:07 PM (GMT-06:00)

Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

?

I haven't posted very many times and tried to resend the pictures...

?

?

-------- Original message --------

From: Dave Wise <david_wise@...>

Date: 8/29/22 6:00 PM (GMT-06:00)

Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You’ll need to free them up, degrease with something that doesn’t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

Re: Hp8640b

 

开云体育

The eight-turn stop is essential.? If you go more than eight turns and smash the back end of the cavity, the VFO is irreparably ruined.

I don’t know what is safe to degrease that plastic.

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 4:11 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

?

?

-------- Original message --------

From: "Dave ." <ktx85@...>

Date: 8/29/22 6:07 PM (GMT-06:00)

Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

?

I haven't posted very many times and tried to resend the pictures...

?

?

-------- Original message --------

From: Dave Wise <david_wise@...>

Date: 8/29/22 6:00 PM (GMT-06:00)

Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

?

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You’ll need to free them up, degrease with something that doesn’t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

Re: Hp 400D serial number decoder

 

On Tue, Aug 30, 2022 at 01:03 AM, Dave Miller wrote:

A 400D found it’s way home tonight.?

I am trying to decode serial number to approximate its vintage.?

Serial number is 16210. ?That does not seem to fit into any of the decoders I have found to online to date.?

That's a mid- to late- 1950s vintage. The coding of the date into the serial prefix did not start until 1960. Before 1960, HP just used a plain serial number. After 1960, HP used a serial prefix that encoded the year and week the design was finalized, then a letter followed by a sequencial serial number. I found a error notice from HP on the 400D, dated 1959, that talked about serial nos. before 29721, so yours must be well before 1959.

The first thing to do with your 400D is to replace all 4 of the large paper caps. These are ALL bad (leaky) by now. Three are plate to grid coupling caps in the amplifier stages and one is in the power supply. The three will pull the following grids up high putting those tubes into way too much conduction. Each of those three is in parallel with a mica cap for higher frequencies. The micas are usually fine, but I've had one that was also leaky. Check the grid voltages when you think you're done, to make sure none of them are still being pulled high.

Leakage in the 4th cap doesn't seem to bother the power supply, but you might as well replace it anyway, while you're at it.
Re: Hp 400D serial number decoder

 

Thanks Jeremy,
That fills in the missing information.
I have found other information that says they started in 1954.
Cool
Thank you very much.

Dave
?

On Tue, Aug 30, 2022 at 6:46 AM Jeremy Nichols <jn6wfo@...> wrote:
Early HP serial numbers did not use a date reference. All we can tell is that it was before 1960. When I get up, I’ll see if I can learn when the 400D was introduced. For now, my guess would be “late 1950s.”



On Mon, Aug 29, 2022 at 11:04 PM Dave Miller <ve7hr@...> wrote:

A 400D found it’s way home tonight.?

I am trying to decode serial number to approximate its vintage.?

Serial number is 16210.? That does not seem to fit into any of the decoders I have found to online to date.?

The online manual I have found does mention that serial number range but the is not copyright date on the manual.?


Thanks
Dave

--
Jeremy Nichols
6.



--
72 de Dave
VE7HR
Re: Hp 400D serial number decoder

 

Early HP serial numbers did not use a date reference. All we can tell is that it was before 1960. When I get up, I’ll see if I can learn when the 400D was introduced. For now, my guess would be “late 1950s.”



On Mon, Aug 29, 2022 at 11:04 PM Dave Miller <ve7hr@...> wrote:

A 400D found it’s way home tonight.?

I am trying to decode serial number to approximate its vintage.?

Serial number is 16210.? That does not seem to fit into any of the decoders I have found to online to date.?

The online manual I have found does mention that serial number range but the is not copyright date on the manual.?


Thanks
Dave

--
Jeremy Nichols
6.
Re: Hp 8590a spectrum analyzer

Richard Cook
 

I have ordered the replacement caps from mouser. I was noticing a sticker on the side of the power supply board that shown the test points and voltages but I can't find them on the power supply board. Is that indicating a molex connector ? Maybe I overlooked something.? Also I did find a lose screw on the if board. I left the unit on for 2 hours and it passed the confidence test. Did it again and it failed.. I hate intermittent troubles. How important is the noise fail ??
Re: Large assortment of H-P parts available

 

On Mon, 29 Aug 2022 at 20:03, greenboxmaven via <ka2ivy=[email protected]> wrote:

Could you please repost the list of equipment in PDF format, so eveyone can read it? Thamks,

Bruce Gentry. KA2IVY


Or you could download LibraOffice, OpenOffice or I expect any number of other programs. LibraOffice works well.

Dave

Re: Large assortment of H-P parts available

 

开云体育

Hello Bob,

?

I can’t open your xlsx document.

?

Can you help with the HP-3476A DMM? I have two in which the hybrid 1813-0091 has failed.

?

Cheers, Brian

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Bob Haas
Sent: Tuesday, 30 August 2022 2:53 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Large assortment of H-P parts available

?

I've uploaded an inventory of what we've found so far. The list is shorter than we thought. More parts may be uncovered in the future.

/g/HP-Agilent-Keysight-equipment/files/hpparts.xlsx
Re: Hp 400D serial number decoder

 

I have been told that the "16" part means 16 years since 1960 so about 1976.

regards
Hp 400D serial number decoder

 

A 400D found it’s way home tonight.?

I am trying to decode serial number to approximate its vintage.?

Serial number is 16210. ?That does not seem to fit into any of the decoders I have found to online to date.?

The online manual I have found does mention that serial number range but the is not copyright date on the manual.?


Thanks
Dave
Re: Boonton 25A Power Meter Calibrator “error.”

 

Buyer beware. Sometimes it's the small things that get you.

Stuart k6yaz
Los Angeles, California
Re: Boonton 25A Power Meter Calibrator “error.”

 

开云体育

You can use 478A Opt.: h75 / h76 . They starts @1Mhz to 1GHz …?

Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
F:?+5411-4032-0072

On 29 Aug 2022, at 23:18, Steve J. Noll, WA6EJO <sjnoll@...> wrote:

?

Recently someone has been selling brand new Boonton 25A Power Meter Calibrators on eBay at a great price. I picked one up to check my HP 478A mounts and 431C and 432A meters. I find a -5 dB error on all settings! The problem turns out to be that the 25A output (0-100 mW) is at 1 MHz. The 478A mounts are only rated down to 10 MHz and are seriously inaccurate below that.
Boonton 25A Power Meter Calibrator “error.”

 

Recently someone has been selling brand new Boonton 25A Power Meter Calibrators on eBay at a great price. I picked one up to check my HP 478A mounts and 431C and 432A meters. I find a -5 dB error on all settings! The problem turns out to be that the 25A output (0-100 mW) is at 1 MHz. The 478A mounts are only rated down to 10 MHz and are seriously inaccurate below that.
Re: Hp8640b

 

开云体育



-------- Original message --------
From: "Dave ." <ktx85@...>
Date: 8/29/22 6:07 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

I haven't posted very many times and tried to resend the pictures...


-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/29/22 6:00 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You’ll need to free them up, degrease with something that doesn’t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

20220829_134814_resized.jpg
20220829_134753_resized_1.jpg
20220829_134527_resized.jpg

Re: Hp8640b

 

开云体育

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

I haven't posted very many times and tried to resend the pictures...


-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/29/22 6:00 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You’ll need to free them up, degrease with something that doesn’t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

Re: Hp8640b

 

开云体育

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You’ll need to free them up, degrease with something that doesn’t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

Hp8640b

 

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

20220829_134814.jpg
20220829_134810.jpg
20220829_134802.jpg
20220829_134759.jpg
20220829_134527.jpg

22761 - 22780 of 151568