Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Attila Kinali]

On Mon, 21 Aug 2017 14:56:20 +
Mark Sims  wrote:

> RDR Electronics has SA22's for not much more than the X72. 
> The problem with SA22's is the connector.  It is a dual row 18 pin
> connector with 2mm pitch.

At least you can get 2mm header pins quite easily. But yes, I have the
same problem. I have an SA22 sitting on my desk that waits for
an adapter board.

>  It is on the bottom of the box where you want
> to mount the heatsink.   Not sure how one would mount it so that the full
> surface is on the heatsink.   It looks like they use a mating SMD PCB
> mounted connector.

In one of the documentation, they specified a few ways how to
mount it on a heatsink. They all boil down to having the heatsink
only in the back part and the adapter PCB in the front part.

Attila Kinali

-- 
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use without that foundation.
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Ed Palmer]

FYI, a small number of interface boards for the SA22 are available 
here:  www.ebay.com/itm/142461937901 .  If you look in the Designer's 
Reference & User's Guide, it shows the adapter board with and without 
the heat sink.  It has the same connector as the X72, but you don't have 
to use it!


Ed

On 2017-08-21 12:49 PM, time-nuts-requ...@febo.com wrote:

Message: 2
Date: Mon, 21 Aug 2017 14:56:20 +
From: Mark Sims<hol...@hotmail.com>
To:"time-nuts@febo.com"  <time-nuts@febo.com>
Subject: [time-nuts] Special connector for Symmetricom X72 rubidium
standard
Message-ID:

<sn1pr11mb102443a32d262f843703c45dce...@sn1pr11mb1024.namprd11.prod.outlook.com>

Content-Type: text/plain; charset="iso-8859-1"

I'm going to buy enough boards to get them for a decent price... way lower than 
you can have them built for.  Will also probably do them with a kit of parts.

RDR Electronics has SA22's for not much more than the X72.   The problem with 
SA22's is the connector.  It is a dual row 18 pin connector with 2mm pitch.  It 
is on the bottom of the box where you want to mount the heatsink.   Not sure 
how one would mount it so that the full surface is on the heatsink.   It looks 
like they use a mating SMD PCB mounted connector.

-


>So if he had finished his board I would be happy to

get the sources to get some ordered at my local PCB manufacturer.
I think that brings the best options for future use of the X72
oscillator which seems to be a very good small rubidium oscillator
nowerdays. SA22.c oscillators are not so spread over the known used-item
reseller sources and if yes they are quite expensive to buy.


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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Bob kb8tq]

Hi

A lot of the OEM’s seem to be going with a large multi layer PCB as the 
“heatsink” for 
the lightweight Rb’s. Apparently they have enough airflow through their racks 
that this
works ok for them. In that case, I think I’d prefer some sort of “cheap”  SMD 
PC mount 
connector. Faster to assemble that way …..those nickels add up quick :)

Bob

> On Aug 21, 2017, at 10:56 AM, Mark Sims  wrote:
> 
> I'm going to buy enough boards to get them for a decent price... way lower 
> than you can have them built for.  Will also probably do them with a kit of 
> parts.
> 
> RDR Electronics has SA22's for not much more than the X72.   The problem with 
> SA22's is the connector.  It is a dual row 18 pin connector with 2mm pitch.  
> It is on the bottom of the box where you want to mount the heatsink.   Not 
> sure how one would mount it so that the full surface is on the heatsink.   It 
> looks like they use a mating SMD PCB mounted connector.
> 
> -
> 
>> So if he had finished his board I would be happy to 
> get the sources to get some ordered at my local PCB manufacturer.
> I think that brings the best options for future use of the X72 
> oscillator which seems to be a very good small rubidium oscillator 
> nowerdays. SA22.c oscillators are not so spread over the known used-item 
> reseller sources and if yes they are quite expensive to buy.
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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

I'm going to buy enough boards to get them for a decent price... way lower than 
you can have them built for.  Will also probably do them with a kit of parts.

RDR Electronics has SA22's for not much more than the X72.   The problem with 
SA22's is the connector.  It is a dual row 18 pin connector with 2mm pitch.  It 
is on the bottom of the box where you want to mount the heatsink.   Not sure 
how one would mount it so that the full surface is on the heatsink.   It looks 
like they use a mating SMD PCB mounted connector.

-

> So if he had finished his board I would be happy to 
get the sources to get some ordered at my local PCB manufacturer.
I think that brings the best options for future use of the X72 
oscillator which seems to be a very good small rubidium oscillator 
nowerdays. SA22.c oscillators are not so spread over the known used-item 
reseller sources and if yes they are quite expensive to buy.
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Christoph Kopetzky]

Hello Ed,

No I do not want to use a printer cable to connect to the X72 
oscillator. This is not recommendable as you wrote for several reasons.
I would prefer a solution which uses an actual connector which could 
replace the obsolete Molex 52660-2651 plug.
This is very difficult because every manufacturer which had connectors 
with 1.0 mm pitch in its program has stopped production of those connectors.
I wrote a lot of emails the last days to a lot of sellers and to 
manufacturers which had 1.0 mm pitch conns in their program but all 
cannot sell ones right now.
Another solution would be to to replace the original Molex board 
connector with a newer 1.27 mm pitch one. There a some sources but it is 
hard to find one which fits the onboard pcb layout. So I do not want to 
rebuild the X72. I prefer a solution which do not modify the rubidium 
source.


Mark Sims solution to build a new connector board with the needed 
connections and may be a little bit more features will be the best 
solution right now. So if he had finished his board I would be happy to 
get the sources to get some ordered at my local PCB manufacturer.
I think that brings the best options for future use of the X72 
oscillator which seems to be a very good small rubidium oscillator 
nowerdays. SA22.c oscillators are not so spread over the known used-item 
reseller sources and if yes they are quite expensive to buy.


If some of you wants to buy one ore more X72 I had a link to a seller 
which has a few on stock:

Here is the link:
http://www.ebay.de/itm/Symmetricom-X72-Rubidium-Oscillator-10-32V-DC-10MHz/152549446499?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Have a nice day and

*with best Regards*
*
*
*Chris

*

Chris,

Are you suggesting reusing the entire cable?  I wasn't suggesting that.
The cable is over a meter long!  Even if the wiring was correct, which
it isn't, I don't know if you could pull enough power through those 28
guage wires even though they have multiple leads in parallel.  Either
remove the cable from the IDC connector and replace with something more
appropriate or cut the cable and leave maybe 10 cm. of cable attached to
the connector.  Terminate as appropriate.

Datum understood that different situations require different solutions.
They provided both Molex and 'circuit board' connectors for maximum
flexibility.  Personally, I think the connector looks a little silly.
It's so big compared to the X72.  But for some users, it might be perfect.

I'm looking forward to Mark's circuit boards.  I have one of the
official boards that I've barnacled a few extra leads onto to bring out
the signals that Datum didn't, but it's ugly.  A better solution would
be welcome.

You asked for the connector, I provided a source.  As is typical with
Time-Nuts equipment, some assembly is required.

Ed

On 2017-08-18 9:56 AM, Christoph Kopetzky https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>> wrote:
>/Hello all, />//>/here is the connection schematics from symmetricoms designer manual for />/the X72. />/So you see, that there is no need for an25 pin connector on the boards />/side:) />//>//>//>/If someone wants to download the X72 designer guide here it is: />//>/http://www1.symmetricom.com/media/files/support/productmanual/man-x72.pdf 
/>//>/Regards />//>/Chris /


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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

Yes, you're missing something...  the SA22.c runs on +15V and +5V.  The X72 
manual says they have 5V versions and versions that can run on 10V .. 30V (but 
the HEALTH message reports some values that appear to indicate it alarms or 
shuts down at <11.47V or >23.9969).  

But who knows?  The X72 / SA22 documentation is, without a doubt,  some of the 
worst I've ever seen... and I've seen a lot.  The magnitude of its crapitude is 
unfathomable.

--

> Isn't this the "max warm up power" in the "X71 Design Absolute Maximum Rating"
table in the designer's refernence manual? Or am I missing something?
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Attila Kinali]

On Sun, 20 Aug 2017 16:22:18 +
Mark Sims  wrote:

> It can also be used with the SA22.c once a board that breaks out the SA22 
> connector pinouts to a 34 pin cable (8 pins are for the SA22.c +5V power/
> gnd) is built. Note the TO-220 LM7805 voltage regulator...  Symmeticom does 
> not deign to tell use mere peons how much current that needs.  That 
> regulator may need to be a switcher or need a heat sink.


Isn't this the "max warm up power" in the "X71 Design Absolute Maximum Rating"
table in the designer's refernence manual? Or am I missing something?
It states that the X72 uses 17W max 10W for 25°C ambient. Which sounds
about as much as I expect for an vapor cell standard. Though 3A on 5V
(or 2A @25°C) is a bit tough.

Attila Kinali
-- 
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering.  -- The Doctor
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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

Here's a look at the first cut of the signal interface board for the X72.  The 
board does not bring out the LEDs.  You can pick those off the connector board.

It can also be used with the SA22.c once a board that breaks out the SA22 
connector pinouts to a 34 pin cable (8 pins are for the SA22.c +5V power/gnd) 
is built. Note the TO-220 LM7805 voltage regulator...  Symmeticom does not 
deign to tell use mere peons how much current that needs.  That regulator may 
need to be a switcher or need a heat sink.

The BNC on the end of the board is configured to output the programmable ACMOS 
output, but with a cut and jumper can output the FXO output (the 60 MHz X72 
oscillator output)

gps4.pdf
Description: gps4.pdf
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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

The Mark II  (groan)...  changed power connector to a 2.1mm barrel jack,  added 
a 15uF or so filter cap,  added a PPS LED,  added a separate ground test point, 
 added series damping resistors for the ACMOS and FXO outputs (can be omitted 
to isolate these signals from the cable), etc.___
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Ed Palmer]

Chris,

Are you suggesting reusing the entire cable?  I wasn't suggesting that.  
The cable is over a meter long!  Even if the wiring was correct, which 
it isn't, I don't know if you could pull enough power through those 28 
guage wires even though they have multiple leads in parallel.  Either 
remove the cable from the IDC connector and replace with something more 
appropriate or cut the cable and leave maybe 10 cm. of cable attached to 
the connector.  Terminate as appropriate.


Datum understood that different situations require different solutions.  
They provided both Molex and 'circuit board' connectors for maximum 
flexibility.  Personally, I think the connector looks a little silly.  
It's so big compared to the X72.  But for some users, it might be perfect.


I'm looking forward to Mark's circuit boards.  I have one of the 
official boards that I've barnacled a few extra leads onto to bring out 
the signals that Datum didn't, but it's ugly.  A better solution would 
be welcome.


You asked for the connector, I provided a source.  As is typical with 
Time-Nuts equipment, some assembly is required.


Ed

On 2017-08-18 9:56 AM, Christoph Kopetzky  wrote:

Hello all,

here is the connection schematics from symmetricoms designer manual for
the X72.
So you see, that there is no need for an25 pin connector on the boards
side:)



If someone wants to download the X72 designer guide here it is:

http://www1.symmetricom.com/media/files/support/productmanual/man-x72.pdf

Regards

Chris


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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

Image of the first cut of the X72 interface board attached...

This board can be used stand-alone or connected to another soon-to-be board 
with RS-232, 4xBNC, and 2.1mm power connectors.  Hopefully the second board 
will also be able to connect to a SA22.c___
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Christoph Kopetzky]

Hello all,

here is the connection schematics from symmetricoms designer manual for 
the X72.
So you see, that there is no need for an25 pin connector on the boards 
side :)




If someone wants to download the X72 designer guide here it is:

http://www1.symmetricom.com/media/files/support/productmanual/man-x72.pdf

Regards

Chris

Ed Palmer 
 
Thu, 17 Aug 2017 22:11:47 -0700 
 



I did some more work on the HP printer cable that uses this connector. 
Here's what I found:

1.  Pin 25 on the X72 connector is unconnected.
2. The connector is IDC. It's possible to open it up and add the extra 
lead, but like all IDC connectors, it's rather fragile. 3. Of the 25 
leads in the cable, 10 aren't connected through. However, the 
disconnect is at the DB-25 end. All 25 leads are wired into the X72 
end. 4. HP used both JST and Molex connectors. From the pictures I've 
found, I can't tell if the Molex connectors can be opened.

5.  The connector appears to be model DMX as shown here:
https://web.archive.org/web/20050313045224/http://www.jst-mfg.com:80/pdfE/eDMX.pdf
It looks like you have to order all the pieces seperately (?).
JST Connector: http://www.ebay.com/itm/182682094117 . Note the angled 
corners near the cable. Molex Connector: www.ebay.com/itm/182474574277 
. Note the corners are closer to square than on the JST connector. The 
ideal result would be to find a source of new,unused connectors, but 
these printer cables appear to be an alternative.

Ed

--

Regards

Christoph Kopetzky

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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Ed Palmer]

I did some more work on the HP printer cable that uses this connector.  
Here's what I found:


1.  Pin 25 on the X72 connector is unconnected.
2.  The connector is IDC.  It's possible to open it up and add the extra 
lead, but like all IDC connectors, it's rather fragile.
3.  Of the 25 leads in the cable, 10 aren't connected through. However, 
the disconnect is at the DB-25 end.  All 25 leads are wired into the X72 
end.
4.  HP used both JST and Molex connectors.  From the pictures I've 
found, I can't tell if the Molex connectors can be opened.

5.  The connector appears to be model DMX as shown here:
https://web.archive.org/web/20050313045224/http://www.jst-mfg.com:80/pdfE/eDMX.pdf
It looks like you have to order all the pieces seperately (?).

JST Connector:  http://www.ebay.com/itm/182682094117 .  Note the angled 
corners near the cable.
Molex Connector:  www.ebay.com/itm/182474574277 .  Note the corners are 
closer to square than on the JST connector.


The ideal result would be to find a source of new,unused connectors, but 
these printer cables appear to be an alternative.


Ed

On 2017-08-15 10:00 AM, Christoph Kopetzky  wrote:

Dear all time-nuts list members,

I am looking without any success for some Molex plugs (52660-2651) to
connect to my X72 time standard.
Molex told me that these connectors are obolete since 2010.
I made some recherches at the Molex competitors but all told me that
they do not have 1mm pitch connectors in
their program.
Is there anybody who can help me getting some of these connectors?

That would be very kind and you will set me happy again...

Best Regards

Chris


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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Bob kb8tq]

Hi

10 MHz sine output would be pretty high up on my list of “pins to send 
someplace else …”

Bob

> On Aug 17, 2017, at 5:36 PM, Mark Sims  wrote:
> 
> Cable has a DB-25 on the other end.  X72 uses 26 pins.  So logically it would 
> be pin 26 that is missing...  10 MHz sine wave output...   nobody needs that 
> one now, do they? 
> 
> 
> 
>> If you have it open, can you tell which is the pin that's missing?
> Maybe that one isn't needed and thus can be ignored.
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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

Cable has a DB-25 on the other end.  X72 uses 26 pins.  So logically it would 
be pin 26 that is missing...  10 MHz sine wave output...   nobody needs that 
one now, do they? 



> If you have it open, can you tell which is the pin that's missing?
Maybe that one isn't needed and thus can be ignored.
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Attila Kinali]

On Thu, 17 Aug 2017 13:05:47 -0600
Ed Palmer  wrote:

> One source of that connector is an HP C8231A cable for a Deskjet 450.  
> It's used to connect the printer to a DB-25 parallel port. The connector 
> fits the X72, but there are only 25 leads in the cable.  I haven't tried 
> to use it so I don't know if the missing lead is important or not.  The 
> cable isn't molded so it might just be possible to add the extra wire. I 
> opened it up, but I can't tell.  It looks like it's an IDC connector.  
> The connector is stamped with the manufacturer's logo of 'JST' ( 
> www.jst.com ).  No part number, though.  I looked at the web site, but 
> didn't see anything close.

If you have it open, can you tell which is the pin that's missing?
Maybe that one isn't needed and thus can be ignored.

Attila Kinali

-- 
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering.  -- The Doctor
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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

I'm leaning more towards a two board solution now.  A small 0.032" board that 
breaks out the X72 connector to a standard 26 pin ribbon cable header and a 
larger 0.062" board with the BNC's and RS-232 interface.   

This should provide a more robust solution that offers better mounting options. 
  I don't like the idea of a large , thin PCB with heavy components hanging off 
the X72.  The larger board would also have an SA22 pinout connector.  

The small, thin board might have a place for LOCK and SRVC LED's and the 390 pF 
cap and impedance matching resistor.  Also a power input.
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Ed Palmer]

Chris,

One source of that connector is an HP C8231A cable for a Deskjet 450.  
It's used to connect the printer to a DB-25 parallel port. The connector 
fits the X72, but there are only 25 leads in the cable.  I haven't tried 
to use it so I don't know if the missing lead is important or not.  The 
cable isn't molded so it might just be possible to add the extra wire. I 
opened it up, but I can't tell.  It looks like it's an IDC connector.  
The connector is stamped with the manufacturer's logo of 'JST' ( 
www.jst.com ).  No part number, though.  I looked at the web site, but 
didn't see anything close.


Ed

On 2017-08-15 10:00 AM, Christoph Kopetzky  wrote:

Dear all time-nuts list members,

I am looking without any success for some Molex plugs (52660-2651) to
connect to my X72 time standard.
Molex told me that these connectors are obolete since 2010.
I made some recherches at the Molex competitors but all told me that
they do not have 1mm pitch connectors in
their program.
Is there anybody who can help me getting some of these connectors?

That would be very kind and you will set me happy again...

Best Regards

Chris


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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Christopher Hoover]

I'm interested in a piece or two if you do this.   Happy to review
schematics and layout, too.  -- Christopher  AI6KG


On Tue, Aug 15, 2017 at 8:28 AM, Mark Sims  wrote:

> Symmetricom sold some interface boards for the X72.   They are 0.32-ish
> inch thick PCB's  with a dual sided edge tab pattern on them.   The PCB
> edge tab will insert into the connector on the X72.  The interface board
> for my X72's only breaks out 12 pins...  a lot of Ebay X72's come with that
> 12 pin connector board...  I think that they were pulls from some piece of
> equipment.   My X72's only had 250 hours on them.
>
> I have been thinking about laying out an X72 interface board that has the
> edge tab broken out to a standard 26 pin 0.1" pattern,  a RS-232 inteface,
> BNC's for the 10 MHz, ACMOS output,  1PPS in,  1PPS output, etc.  The board
> would also have a way to connect it to the SA22.
>
> Lady Heather now talks to X72's (and probably X99's and SA22's).   I have
> implemented a disciplining algorithm for use with X72s that have the older
> firmware that does not do disciplining... like probably 99% of the X72's
> out there.  Symmetricom's code only seems to keep the 1PPS aligned with 300
> ns.  My code attempts to keep it within 100 ns.
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Christoph Kopetzky]

Hello Attila,

I found one manufacturer which has nearly similar connectors in his 
program: htk-jp.com
They have SDR and HDR connectors on stock but all of them do have 0.8 mm 
pitch. The
original Molex 52660-2651 connector has 1.0 mm pitch so that would not 
fit...


Am 16.08.2017 um 13:05 schrieb Attila Kinali:

Moin,

On Tue, 15 Aug 2017 15:15:16 +0200
Christoph Kopetzky  wrote:


I am looking without any success for some Molex plugs (52660-2651) to
connect to my X72 time standard.
Molex told me that these connectors are obolete since 2010.
I made some recherches at the Molex competitors but all told me that
they do not have 1mm pitch connectors in
their program.
Is there anybody who can help me getting some of these connectors?

 From the drawing and from the pictures this looks like a variant
of the mini-centronics, or more precisely mini/micro D-ribbon connectors.

They have lost quite a bit of popularity with the demise of SCSI,
but there should be still some manufacturers building them.
I am not sure though, how many ever had the 1mm pitch one.

Attila Kinali



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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Attila Kinali]

Re-moin,

On Wed, 16 Aug 2017 14:01:02 +0200
Christoph Kopetzky  wrote:

> I found one manufacturer which has nearly similar connectors in his 
> program: htk-jp.com
> They have SDR and HDR connectors on stock but all of them do have 0.8 mm 
> pitch. The
> original Molex 52660-2651 connector has 1.0 mm pitch so that would not 
> fit...

If you cannot find anything that fits, you can always unsolder the connector
and replace it with something that is still being sold. There should be quite
a few connectors out there, that have a solder pitch of 0.5mm. Though
it would definitely take some time to find a good fit.

Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Attila Kinali]

Moin,

On Tue, 15 Aug 2017 15:15:16 +0200
Christoph Kopetzky  wrote:

> I am looking without any success for some Molex plugs (52660-2651) to 
> connect to my X72 time standard.
> Molex told me that these connectors are obolete since 2010.
> I made some recherches at the Molex competitors but all told me that 
> they do not have 1mm pitch connectors in
> their program.
> Is there anybody who can help me getting some of these connectors?

>From the drawing and from the pictures this looks like a variant
of the mini-centronics, or more precisely mini/micro D-ribbon connectors.

They have lost quite a bit of popularity with the demise of SCSI,
but there should be still some manufacturers building them.
I am not sure though, how many ever had the 1mm pitch one.

Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Re: [time-nuts] Special connector for Symmetricom X72 rubidium standard

[Christoph Kopetzky]

Hello Mark,

thanks for your info.
Does your actual version 5.0 also support the X72 rubidium oscillator?
And if not could you please send me your modified version for the X72?

Thank you in advance and

kind Regards

Chris



Date: Tue, 15 Aug 2017 15:15:16 +0200
From: Christoph Kopetzky <c...@cksd.de>
To: time-nuts@febo.com
Subject: [time-nuts] Special connector for Symmetricom X72 rubidium
    standard
Message-ID: <016e6b48-a7d7-6624-9a61-7aa8f7785...@cksd.de>
Content-Type: text/plain; charset=utf-8; format=flowed

Dear all time-nuts list members,

I am looking without any success for some Molex plugs (52660-2651) to
connect to my X72 time standard.
Molex told me that these connectors are obolete since 2010.
I made some recherches at the Molex competitors but all told me that
they do not have 1mm pitch connectors in
their program.
Is there anybody who can help me getting some of these connectors?

That would be very kind and you will set me happy again...

Best Regards

Chris



--

Message: 5
Date: Tue, 15 Aug 2017 15:28:29 +
From: Mark Sims <hol...@hotmail.com>
To: "time-nuts@febo.com" <time-nuts@febo.com>
Subject: [time-nuts] Special connector for Symmetricom X72 rubidium
standard
Message-ID:

<sn1pr11mb1024203195d168eda1f6951ace...@sn1pr11mb1024.namprd11.prod.outlook.com>

Content-Type: text/plain; charset="iso-8859-1"

Symmetricom sold some interface boards for the X72.   They are 0.32-ish inch 
thick PCB's  with a dual sided edge tab pattern on them.   The PCB edge tab 
will insert into the connector on the X72.  The interface board for my X72's 
only breaks out 12 pins...  a lot of Ebay X72's come with that 12 pin connector 
board...  I think that they were pulls from some piece of equipment.   My X72's 
only had 250 hours on them.

I have been thinking about laying out an X72 interface board that has the edge tab 
broken out to a standard 26 pin 0.1" pattern,  a RS-232 inteface, BNC's for the 
10 MHz, ACMOS output,  1PPS in,  1PPS output, etc.  The board would also have a way 
to connect it to the SA22.

Lady Heather now talks to X72's (and probably X99's and SA22's).   I have 
implemented a disciplining algorithm for use with X72s that have the older 
firmware that does not do disciplining... like probably 99% of the X72's out 
there.  Symmetricom's code only seems to keep the 1PPS aligned with 300 ns.  My 
code attempts to keep it within 100 ns.



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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Mark Sims]

Symmetricom sold some interface boards for the X72.   They are 0.32-ish inch 
thick PCB's  with a dual sided edge tab pattern on them.   The PCB edge tab 
will insert into the connector on the X72.  The interface board for my X72's 
only breaks out 12 pins...  a lot of Ebay X72's come with that 12 pin connector 
board...  I think that they were pulls from some piece of equipment.   My X72's 
only had 250 hours on them.

I have been thinking about laying out an X72 interface board that has the edge 
tab broken out to a standard 26 pin 0.1" pattern,  a RS-232 inteface, BNC's for 
the 10 MHz, ACMOS output,  1PPS in,  1PPS output, etc.  The board would also 
have a way to connect it to the SA22.

Lady Heather now talks to X72's (and probably X99's and SA22's).   I have 
implemented a disciplining algorithm for use with X72s that have the older 
firmware that does not do disciplining... like probably 99% of the X72's out 
there.  Symmetricom's code only seems to keep the 1PPS aligned with 300 ns.  My 
code attempts to keep it within 100 ns.
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[time-nuts] Special connector for Symmetricom X72 rubidium standard

[Christoph Kopetzky]

Dear all time-nuts list members,

I am looking without any success for some Molex plugs (52660-2651) to 
connect to my X72 time standard.

Molex told me that these connectors are obolete since 2010.
I made some recherches at the Molex competitors but all told me that 
they do not have 1mm pitch connectors in

their program.
Is there anybody who can help me getting some of these connectors?

That would be very kind and you will set me happy again...

Best Regards

Chris

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