¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: GPSDO connected to external ref inputs

 

There is a pot on each channel board to set the level on that particular
channel. We've had three through here and ALL of them had bad filter caps
in the power supply.

If you're interested I have a bare board of a mini-circuits based 6 output
distribution amp. I use a 6 pole filter and an Analog Devices 1:6 splitter
to do the hard work. If the filter offends your sense of phase shift with
temperature it can be left out. Details on request by direct email.

Regards,
?
Stephen Hanselman
Datagate Systems, LLC
s.hanselman@...
www.datagatesystems.com

-----Original Message-----
From: [email protected]
<[email protected]> On Behalf Of ArtekManuals
Sent: Tuesday, April 14, 2020 9:34 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] GPSDO connected to external ref
inputs

Jim ( et all)

There are 5087A's and there are 5087A's . Be careful and do your homework
when shopping for one? . They come with a plethora of optional Input and
output amps. Some will do what you want some will be completely useless,
some will have been scavenged and are bare bones without any input or output
modules ....8^(. Get the seller to tell you by board part number what is in
a unit. You can't trust what the options tags on the outside of the unit say
...been there done that got the scars to prove it.


Dave
manuals@...

On 4/13/2020 4:51 PM, Jim Ford wrote:
Thanks, Greg.

I will put the 5087A on my wishlist!? Nice that it allows individual
output amplitudes to be set (how, though?) and that it has a large
number of outputs.? Although I couldn't find a picture of the rear
panel on ebay; I expect a forest of BNC jacks.

Downside is the size; I have my?BG7TBL distribution amp suspended from
the bottom of my equipment shelf over my bench, so it takes up zero
bench or shelf space.? Right next to it is the GPSDO, also tucked under.

Mini-Circuits I'm quite familiar with, as the guy running the show
there, Ted Heil, and the local rep at Coastal RF Systems, Frank
Edwards, and I all worked together at Powerwave Technologies back in
the late 1990's to early 2000's.? Yeah, I've been amazed for 30 or so
years at how their prices are so much more reasonable than anybody else's.

Nice collection you have!? Although I hate to use the term collection,
as it violates the "Love people and use things, not the other way
around" principle.? Collecting implies not using because it devalues
the items, and I've never understood why people would have say,
HotWheels cars they couldn't play with, or guitars nobody could play
("Don' even look a' it!" to quote Nigel Tufnel in This Is Spinal
Tap!).? OK, I'll get off the soapbox now!

Jim

------ Original Message ------
From: "Greg Muir via groups.io" <big_sky_explorer@...
<mailto:big_sky_explorer@...>>
To: [email protected]
<mailto:[email protected]>
Sent: 4/13/2020 10:47:35 AM
Subject: Re: [HP-Agilent-Keysight-equipment] GPSDO connected to
external ref inputs

Jim,

I have a HP 5087A distribution amp feeding output from an older HP
Z3816 GPSDO to several pieces of equipment.These include:

Agilent E4425B signal generator

Agilent 8714ET network analyzer

EIP 548A microwave frequency counter

HP 3575A gain/phase meter

HP 5335A counter

HP 8920A RF communication test set

HP 53310A modulation domain analyzer

HP K34-9991A phase comparator

PTS 250 frequency synthesizer

Tracor 527E frequency difference meter

Tracor 895A linear phase/time comparator

Wayne Kerr PSG2400L signal generator

Except for the Z3816/5087 units most of the driven equipment is in a
power-down state unless needed.The port on the 527E is switchable to
an external connector on the bench for other test applications.In
all, I feed one volt p-p or less to all of the equipment and it stays
happy.The advantage with the 5087A is that each output is
individually adjustable to suit the needs of the attached hardware.

If any of your units cannot tolerate a 4V amplitude I suggest that
you pick up an in-line 50 ohm attenuator either from your favorite
auction site or from Mini-Circuits (no affiliation however I rely on
them for their low-cost high-quality products).4 volts does seem a
little excessive for most external reference inputs since I am
assuming you are referring to RMS amplitude and not peak-to-peak
value


Greg
--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.
Re: hp8350b/hp83595a front panel mod

 

HP's provided tool kits to us (field engineering) also just had phillips. We learned if it's not torqued to tight a #2 phillips did OK on a #1 pozi.

But the best answer is to buy the right ones even though they cost real money

Steve

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Larry McDavid
Sent: Tuesday, April 14, 2020 10:17 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] hp8350b/hp83595a front panel mod

Notice those are PoziDriv head screws, not Phillips. It is easy to damage the screw head and possibly the driver by using the incorrect driver. We all should have 0, 1 and 2 PoziDriv screwdrivers!

Larry

On 4/14/2020 6:18 AM, Steve - Home wrote:
Hi Jan,

The semi-rigid is standard .141 with precision stainless steel SMA
connectors. It is L-shaped with a bit of an offset in the leg that
goes to the front panel connector:...
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
Re: 5335A keyboard LED interesting thing

 

Hi,

Yep, me too, ever since I discovered this. I now feel the urge to buy
some "for parts" old HP instrument for that one keycap :-)

Szabolcs

Raymond Domp Frank <hewpatek@...> ezt ¨ªrta (id?pont: 2020. ¨¢pr.
14., K, 19:05):


On Tue, Apr 14, 2020 at 04:06 PM, Szabolcs Szigeti wrote:

I find this quite amusing.

Looking for a keycap with transparent insert to create my own unique 5335A...

Raymond
Re: Application Note 122: EMI Measurement Procedure

 

Sean

I am afraid that I don't have a copy of AN122 but I would also like a copy please if anyone does have it.

If it is the procedure for EMI measurement that you are interested in, rather than the specific application note, then this one is useful and certainly more up to date:



Tony
Re: hp8350b/hp83595a front panel mod

 

Notice those are PoziDriv head screws, not Phillips. It is easy to damage the screw head and possibly the driver by using the incorrect driver. We all should have 0, 1 and 2 PoziDriv screwdrivers!

Larry

On 4/14/2020 6:18 AM, Steve - Home wrote:
Hi Jan,
The semi-rigid is standard .141 with precision stainless steel SMA connectors. It is L-shaped with a bit of an offset in the leg that goes to the front panel connector:...
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
Re: 5335A keyboard LED interesting thing

 

On Tue, Apr 14, 2020 at 04:06 PM, Szabolcs Szigeti wrote:
I find this quite amusing.
Looking for a keycap with transparent insert to create my own unique 5335A...

Raymond
Re: Service Support Software

Dick
 

¿ªÔÆÌåÓý

Yes, I read on the HP site that the latest it supports is XP, but that was before
WIN7 came out.
Since I don't have an XP machine available, I thought I would give WIN7 a try.

Tnx for the reply,

73, Dick, W1KSZ

From: [email protected] <[email protected]> on behalf of george edmonds via groups.io <G6HIG@...>
Sent: Tuesday, April 14, 2020 9:33 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] Service Support Software
?
Hi Dick

If I remember correctly this is Windows 95 or Windows 98 software, but my memory could be faulty.

Regards

George G6HIG
On Tuesday, 14 April 2020, 17:25:37 BST, Dick <w1ksz@...> wrote:


I downloaded the Service Support Software package so I may
try my hand at checking out my somewhat new 8648C Sig Gen.

Upon opening the SW package up pops a window asking for a
name and password. No matter what I enter it says NG ??

Is there a magic name and PW to get into the files ?

Thanks for your help,

73, Dick, W1KSZ

ps: I am using it on a WIN 7 machine.
Re: GPSDO connected to external ref inputs

 

Jim ( et all)

There are 5087A's and there are 5087A's . Be careful and do your homework when shopping for one? . They come with a plethora of optional Input and output amps. Some will do what you want some will be completely useless, some will have been scavenged and are bare bones without any input or output modules ....8^(. Get the seller to tell you by board part number what is in a unit. You can't trust what the options tags on the outside of the unit say ...been there done that got the scars to prove it.


Dave
manuals@...

On 4/13/2020 4:51 PM, Jim Ford wrote:
Thanks, Greg.

I will put the 5087A on my wishlist!? Nice that it allows individual output amplitudes to be set (how, though?) and that it has a large number of outputs.? Although I couldn't find a picture of the rear panel on ebay; I expect a forest of BNC jacks.

Downside is the size; I have my?BG7TBL distribution amp suspended from the bottom of my equipment shelf over my bench, so it takes up zero bench or shelf space.? Right next to it is the GPSDO, also tucked under.

Mini-Circuits I'm quite familiar with, as the guy running the show there, Ted Heil, and the local rep at Coastal RF Systems, Frank Edwards, and I all worked together at Powerwave Technologies back in the late 1990's to early 2000's.? Yeah, I've been amazed for 30 or so years at how their prices are so much more reasonable than anybody else's.

Nice collection you have!? Although I hate to use the term collection, as it violates the "Love people and use things, not the other way around" principle.? Collecting implies not using because it devalues the items, and I've never understood why people would have say, HotWheels cars they couldn't play with, or guitars nobody could play ("Don' even look a' it!" to quote Nigel Tufnel in This Is Spinal Tap!).? OK, I'll get off the soapbox now!

Jim

------ Original Message ------
From: "Greg Muir via groups.io" <big_sky_explorer@... <mailto:big_sky_explorer@...>>
To: [email protected] <mailto:[email protected]>
Sent: 4/13/2020 10:47:35 AM
Subject: Re: [HP-Agilent-Keysight-equipment] GPSDO connected to external ref inputs

Jim,

I have a HP 5087A distribution amp feeding output from an older HP Z3816 GPSDO to several pieces of equipment.These include:

Agilent E4425B signal generator

Agilent 8714ET network analyzer

EIP 548A microwave frequency counter

HP 3575A gain/phase meter

HP 5335A counter

HP 8920A RF communication test set

HP 53310A modulation domain analyzer

HP K34-9991A phase comparator

PTS 250 frequency synthesizer

Tracor 527E frequency difference meter

Tracor 895A linear phase/time comparator

Wayne Kerr PSG2400L signal generator

Except for the Z3816/5087 units most of the driven equipment is in a power-down state unless needed.The port on the 527E is switchable to an external connector on the bench for other test applications.In all, I feed one volt p-p or less to all of the equipment and it stays happy.The advantage with the 5087A is that each output is individually adjustable to suit the needs of the attached hardware.

If any of your units cannot tolerate a 4V amplitude I suggest that you pick up an in-line 50 ohm attenuator either from your favorite auction site or from Mini-Circuits (no affiliation however I rely on them for their low-cost high-quality products).4 volts does seem a little excessive for most external reference inputs since I am assuming you are referring to RMS amplitude and not peak-to-peak value


Greg
--
Dave
Manuals@...
www.ArtekManuals.com
--
This email has been checked for viruses by Avast antivirus software.
Re: Service Support Software

 

Hi Dick

If I remember correctly this is Windows 95 or Windows 98 software, but my memory could be faulty.

Regards

George G6HIG
On Tuesday, 14 April 2020, 17:25:37 BST, Dick <w1ksz@...> wrote:


I downloaded the Service Support Software package so I may
try my hand at checking out my somewhat new 8648C Sig Gen.

Upon opening the SW package up pops a window asking for a
name and password. No matter what I enter it says NG ??

Is there a magic name and PW to get into the files ?

Thanks for your help,

73, Dick, W1KSZ

ps: I am using it on a WIN 7 machine.
Service Support Software

Dick
 

¿ªÔÆÌåÓý

I downloaded the Service Support Software package so I may
try my hand at checking out my somewhat new 8648C Sig Gen.

Upon opening the SW package up pops a window asking for a
name and password. No matter what I enter it says NG ??

Is there a magic name and PW to get into the files ?

Thanks for your help,

73, Dick, W1KSZ

ps: I am using it on a WIN 7 machine.
Re: Application Note 122: EMI Measurement Procedure

 

Sean,

If you are interested in the reference to MIL-STD-826A as referenced in the HP Memory Project page AN index, try

?

Greg
Re: 5335A keyboard LED interesting thing

 

Ha! Wouldn't be the first time a hardware engineer didn't trust the software engineer(s) not to f-up! Been there, done that! Said the hardcore hardware guy who can't resist a potshot at the software weenies!

Jim Ford

------ Original Message ------
From: "Szabolcs Szigeti" <szigiszabolcs@...>
To: [email protected]
Sent: 4/14/2020 7:05:36 AM
Subject: [HP-Agilent-Keysight-equipment] 5335A keyboard LED interesting thing

Hi,

Sorry if it is know, but it is new to me. While fixing the LED in one
of the keys of my 5335A, I have stumbled upon some interesting thing.
All keys have LEDs in them, even those where the keycap does not have
the transparent insert. So far this is not unusual, as manufacturing
could probably be simpler if one has to deal with only one type of
keys, although I found no particular reason why the actual LED had to
be populated as it is not part of the key mechanism. I was able to
replace it with some fiddling and without removing the switch.

However, what I found is that the Gate Cycle Norm key is supposed to
have no light, but the LED there is actually controlled by the CPU and
it lights up if pressed. I saw it light up when the keyboard was
removed from the instrument front panel for testing and then tried it
with the cap removed to verify.
So likely at the late stages of development sometime, someone decided
that this button should not light, and it was accomplished by
replacing the keycap but not modifying the firmware.

I find this quite amusing.

Szabolcs
Re: hp8350b/hp83595a front panel mod

 

¿ªÔÆÌåÓý

?

I¡¯ve got a few of those original cable assemblies.? If someone needs one contact me offline.

?

Tom

?
Re: hp8350b/hp83595a front panel mod

 

Good thing you put in the lower torque spec for 3.5 mm to SMA connection, Steve.? I was about to recommend that the stainless steel SMA connectors be torqued to 8 in-lbs or 0.9 N-m (not N/m).? I read somewhere that brass SMAs should be torqued to 5 in-lbs (0.57 N-m) and stainless steel SMAs should be torqued to 8 in-lbs (0.9 N-m), as determined by the male connector.? I suppose you don't want to overtorque an SMA male mating with a 3.5 mm female to avoid overpenetration and damage to the female (sounds painful!).? I understand a connector gauge is in order here because of the poor control over center pin protrusion in SMA males and the fragility of 3.5 mm and 2.92 mm (K connectors) female coaxial connectors.

Thanks.

Jim Ford

------ Original Message ------
From: "Steve - Home" <steve-krull@...>
Sent: 4/14/2020 6:18:49 AM
Subject: Re: [HP-Agilent-Keysight-equipment] hp8350b/hp83595a front panel mod

Hi Jan,

The semi-rigid is standard .141 with precision stainless steel SMA connectors. It is L-shaped with a bit of an offset in the leg that goes to the front panel connector:

Please note that the front panel connector is not just a feedthrough, it has a DC block built into it. If you substitute a straight bulkhead connector you lose that DC protection. I would recommend removing the rear panel connector and using it instead. You can always revert to rear panel output if you need to. There's precious little room in the plug in to add a relay to allow switching back and forth. If you use your 3.5mm bulkhead connector I'd recommend a connector saver and an external DC block. Better yet go to an SMA bulkhead connector instead of the 3.5mm as I'd bet you'll be using SMA for everything else as 3.5mm connectors are expensive and fragile.

Since you will be mating 3.5mm to SMA do be aware that those connections should be torqued to 5 in/lb, .57 N/m, not the usual SMA to SMA or 3.5 to 3.5 value of 8 in/lb, .9 N/m

If amplitude accuracy needs to be within specs you'll need to do an RF amplitude calibration once everything is in place as you've made changes to the RF output path.

Good luck with the project and let us know how it goes. I've switched an 8340B from rear to front panel output but my 83595A's came with front panel output so I've not needed to modify them.


Cheers,

Steve K.

WB?DBS



On 4/13/2020 11:27 AM, Jan de Jongh wrote:
Hi all,

I'm trying to get my RF output on the front panel instead of at the rear on an hp83595a (26.5 GHz), while leaving the rear-panel option intact. I already have the front-panel connector from ebay and need to make a semi-rigid with 3.5mm connectors to (I guess, need to verify) the 55 dB attenuator.

Does anyone know what type of semi-rigid is used by HP in the hp83595a for the RF output and/or has suggestions for sourcing the connectors? (Sorry, complete semi-rigid noob here...) BTW, the front-panel connector I have is an APC3.5 feed through.

Thanks,
Jan

Re: GPSDO connected to external ref inputs

 

<shameless plug>

The TAPR TADD-1
() is a
well-proven 6 channel RF distribution amp with low phase noise and good
output isolation. The input and output are transformer coupled and the
grounds can be isolated if desired. It's designed for just this sort of
application.

</shameless plug>

John
----

On 4/13/20 4:51 PM, Jim Ford wrote:
Thanks, Greg.

I will put the 5087A on my wishlist!? Nice that it allows individual
output amplitudes to be set (how, though?) and that it has a large
number of outputs.? Although I couldn't find a picture of the rear panel
on ebay; I expect a forest of BNC jacks.

Downside is the size; I have my?BG7TBL distribution amp suspended from
the bottom of my equipment shelf over my bench, so it takes up zero
bench or shelf space.? Right next to it is the GPSDO, also tucked under.

Mini-Circuits I'm quite familiar with, as the guy running the show
there, Ted Heil, and the local rep at Coastal RF Systems, Frank Edwards,
and I all worked together at Powerwave Technologies back in the late
1990's to early 2000's.? Yeah, I've been amazed for 30 or so years at
how their prices are so much more reasonable than anybody else's.

Nice collection you have!? Although I hate to use the term collection,
as it violates the "Love people and use things, not the other way
around" principle.? Collecting implies not using because it devalues the
items, and I've never understood why people would have say, HotWheels
cars they couldn't play with, or guitars nobody could play ("Don' even
look a' it!" to quote Nigel Tufnel in This Is Spinal Tap!).? OK, I'll
get off the soapbox now!

Jim

------ Original Message ------
From: "Greg Muir via groups.io" <big_sky_explorer@...
<mailto:big_sky_explorer@...>>
To: [email protected]
<mailto:[email protected]>
Sent: 4/13/2020 10:47:35 AM
Subject: Re: [HP-Agilent-Keysight-equipment] GPSDO connected to external
ref inputs

Jim,

?

I have a HP 5087A distribution amp feeding output from an older HP
Z3816 GPSDO to several pieces of equipment.? These include:

?

Agilent E4425B signal generator

Agilent 8714ET network analyzer

EIP 548A microwave frequency counter

HP 3575A gain/phase meter

HP 5335A counter

HP 8920A RF communication test set

HP 53310A modulation domain analyzer

HP K34-9991A phase comparator

PTS 250 frequency synthesizer

Tracor 527E frequency difference meter

Tracor 895A linear phase/time comparator

Wayne Kerr PSG2400L signal generator

?

Except for the Z3816/5087 units most of the driven equipment is in a
power-down state unless needed.? The port on the 527E is switchable to
an external connector on the bench for other test applications.? In
all, I feed one volt p-p or less to all of the equipment and it stays
happy.? The advantage with the 5087A is that each output is
individually adjustable to suit the needs of the attached hardware.

?

If any of your units cannot tolerate a 4V amplitude I suggest that you
pick up an in-line 50 ohm attenuator either from your favorite auction
site or from Mini-Circuits (no affiliation however I rely on them for
their low-cost high-quality products).? 4 volts does seem a little
excessive for most external reference inputs since I am assuming you
are referring to RMS amplitude and not peak-to-peak value


?

Greg
Re: GPSDO connected to external ref inputs

 

Thanks, Greg.

I will put the 5087A on my wishlist!? Nice that it allows individual output amplitudes to be set (how, though?) and that it has a large number of outputs.? Although I couldn't find a picture of the rear panel on ebay; I expect a forest of BNC jacks.

Downside is the size; I have my?BG7TBL distribution amp suspended from the bottom of my equipment shelf over my bench, so it takes up zero bench or shelf space.? Right next to it is the GPSDO, also tucked under.

Mini-Circuits I'm quite familiar with, as the guy running the show there, Ted Heil, and the local rep at Coastal RF Systems, Frank Edwards, and I all worked together at Powerwave Technologies back in the late 1990's to early 2000's.? Yeah, I've been amazed for 30 or so years at how their prices are so much more reasonable than anybody else's.

Nice collection you have!? Although I hate to use the term collection, as it violates the "Love people and use things, not the other way around" principle.? Collecting implies not using because it devalues the items, and I've never understood why people would have say, HotWheels cars they couldn't play with, or guitars nobody could play ("Don' even look a' it!" to quote Nigel Tufnel in This Is Spinal Tap!).? OK, I'll get off the soapbox now!

Jim

------ Original Message ------
From: "Greg Muir via groups.io" <big_sky_explorer@...>
Sent: 4/13/2020 10:47:35 AM
Subject: Re: [HP-Agilent-Keysight-equipment] GPSDO connected to external ref inputs

Jim,

?

I have a HP 5087A distribution amp feeding output from an older HP Z3816 GPSDO to several pieces of equipment.? These include:

?

Agilent E4425B signal generator

Agilent 8714ET network analyzer

EIP 548A microwave frequency counter

HP 3575A gain/phase meter

HP 5335A counter

HP 8920A RF communication test set

HP 53310A modulation domain analyzer

HP K34-9991A phase comparator

PTS 250 frequency synthesizer

Tracor 527E frequency difference meter

Tracor 895A linear phase/time comparator

Wayne Kerr PSG2400L signal generator

?

Except for the Z3816/5087 units most of the driven equipment is in a power-down state unless needed.? The port on the 527E is switchable to an external connector on the bench for other test applications.? In all, I feed one volt p-p or less to all of the equipment and it stays happy.? The advantage with the 5087A is that each output is individually adjustable to suit the needs of the attached hardware.

?

If any of your units cannot tolerate a 4V amplitude I suggest that you pick up an in-line 50 ohm attenuator either from your favorite auction site or from Mini-Circuits (no affiliation however I rely on them for their low-cost high-quality products).? 4 volts does seem a little excessive for most external reference inputs since I am assuming you are referring to RMS amplitude and not peak-to-peak value


?

Greg
Re: HP 3325A Phase noise (and reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

 

Yeah, the PTS generators are really, really good for PN, particularly at
HF frequencies.

On 4/14/20 11:38 AM, Mike Feher wrote:
I agree. However, I do put the PTS stuff in a much higher category than
the 3325A. Thanks ¨C Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

?

-----Original Message-----
From: [email protected]
<[email protected]> On Behalf Of John Ackermann N8UR
Sent: Tuesday, April 14, 2020 11:31 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3325A Phase noise (and
reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

?

Trying to compare generators with all the variables that affect PN can
drive you crazy, but would be worthwhile.? I did tests on a bunch of PTS
synthesizers and one of them included a comparison of 10.000000 MHz vs.

9.999999 MHz:

?



?

73,

John

----

On 4/14/20 11:22 AM, Mike Feher wrote:

Very interesting John. Actually, I am surprised as to how good it is.
Although, since the OCXO is also at 10 MHz, it would be more
interesting to see it at some random frequency. Maybe as compared to
an 8662A. 73 ¨C Mike
-=-=-=-=-=-
Re: HP 3325A Phase noise (and reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

 

¿ªÔÆÌåÓý

I agree. However, I do put the PTS stuff in a much higher category than the 3325A. Thanks ¨C Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

?

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of John Ackermann N8UR
Sent: Tuesday, April 14, 2020 11:31 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3325A Phase noise (and reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

?

Trying to compare generators with all the variables that affect PN can drive you crazy, but would be worthwhile.? I did tests on a bunch of PTS synthesizers and one of them included a comparison of 10.000000 MHz vs.

9.999999 MHz:

?

?

73,

John

----

On 4/14/20 11:22 AM, Mike Feher wrote:

> Very interesting John. Actually, I am surprised as to how good it is.

> Although, since the OCXO is also at 10 MHz, it would be more

> interesting to see it at some random frequency. Maybe as compared to

> an 8662A. 73 ¨C Mike

-=-=-=-=-=-
Re: HP 3325A Phase noise (and reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

 

Trying to compare generators with all the variables that affect PN can
drive you crazy, but would be worthwhile. I did tests on a bunch of PTS
synthesizers and one of them included a comparison of 10.000000 MHz vs.
9.999999 MHz:



73,
John
----

On 4/14/20 11:22 AM, Mike Feher wrote:
Very interesting John. Actually, I am surprised as to how good it is.
Although, since the OCXO is also at 10 MHz, it would be more interesting
to see it at some random frequency. Maybe as compared to an 8662A. 73 ¨C
Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

?

-----Original Message-----
From: [email protected]
<[email protected]> On Behalf Of John Ackermann N8UR
Sent: Tuesday, April 14, 2020 11:10 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3325A Phase noise (and
reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

?

Several years ago I did phase noise measurements on a 3325B.? The
results are here:

?



?

The unit had the standard (not high-stability) oscillator and my
measurements showed a dramatic PN improvement using a high-quality
external reference.

?

John

?

-=-=-=-=-=-
Re: HP 3325A Phase noise (and reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

 

¿ªÔÆÌåÓý

Very interesting John. Actually, I am surprised as to how good it is. Although, since the OCXO is also at 10 MHz, it would be more interesting to see it at some random frequency. Maybe as compared to an 8662A. 73 ¨C Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of John Ackermann N8UR
Sent: Tuesday, April 14, 2020 11:10 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3325A Phase noise (and reference clock) as discussed in CuriousMarc's video of Soyuz Clock, Part 6

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Several years ago I did phase noise measurements on a 3325B.? The results are here:

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The unit had the standard (not high-stability) oscillator and my measurements showed a dramatic PN improvement using a high-quality external reference.

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John

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