Re: [time-nuts] Corby Dawson Super 5065a work can I use a miniature Rubidium

[Robert Watson via time-nuts]

Actually some commercial rubidium clocks do use lasers. Check out the
Microsemi SA.3Xm family.

Nonetheless the point about the wavelength stability requirement is
absolutely the case. There are some papers published about the SA.3X
clocks. I can't post links to them, but a quick web search for "A
commercial CPT rubidium clock" by Deng et al. should reveal all.

R.

On 6 November 2016 at 02:56,  wrote:

> Anton,
>
> To answer both questions:
>
> You can use a Laser in place of the Rubidium lamp, however assuming the
> problem is the lamp it would be cheaper to buy several LPRO units to
> scavenge for a replacement lamp.
>
> How did you determine it's the lamp that is dead?
>
> Using a Laser is more complicated than it sounds. The Laser frequency has
> to be stabilized at the proper wavelength. This usually requires a
> combination of selecting the proper diode current as well as the proper
> temperature. Even then the diode ages and drifts away from the proper
> spot. Sometimes a separate Rubidium vapor cell is used to stabilize the
> frequency of the diode.
>
> The equipment to run the diode would take up MUCH more room than the
> LPRO!
>
> This is why you don't find commercial Rubidiums using Laser diodes! (YET)
>
> The Super modification will not work on the miniature Rubidiums.
> (although some do filter the lamp to get a better SN, however performance
> is not anywhere near a Super.)
>
> The 5065A has a large cell and runs at a low temperature, this offers the
> ideal stability and the chance to Super it.
>
> Even so not all 5065A can be Supered!
>
> Cheers,
>
> Corby Dawson
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] test after email address change and repost of PRS10 question.

[Robert Watson]

Mike,

I just measured my FS725  (a PRS10 in a box). The nearest scope was an
analog with only 100MHz bandwidth. The PPS risetime was about 5.5ns.The
usual analog scope risetime is 0.35/bandwidth so that puts scope risetime
around 3.5ns. Whatever the PPS risetime really is, it's an order of
magnitude less than your 70ns for sure.

Best,

Robert.


On 28 January 2014 14:30, Chuck Harris cfhar...@erols.com wrote:

 Time-nuts isn't yahoo.  It is something that John Ackermann
 put together called febo.com.  Febo is one of John's cats.

 Most probably, the OP's email program is set to not display
 emails which appear to originate from his address...

 -Chuck Harris


 Chris Wilson wrote:



  My recent attempts at posting have been all been blocked for some
 reason so I am switching email address in the hope that that corrects it.


  Here is my last one, hoping that it is not a repeat for you guys.


  Hi,
I have just brought my PRS10 out of mothballs and am trying to
 get a good lock to my TBolt 1PPS.
The 1PPS OUT signal from my PRS10 has a very slow rise time, in
 the order of 70ns.  I would be grateful, if anyone here has one on
 their bench, to let me know what theirs is. I can't find any
 specification in the literature.
 Thanks and have a good day.
 Mike




 28/01/2014 11:37

 Hi Mike.

 Both messages (the earlier one from the orange.fr address and this one
 from the sfr.fr address) are showing. If you read the group using
 e-mail just CC the messages you post back to yourself and filter into
 the groups folder. Seems Yahoo changed things (again) recently.

  ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to https://www.febo.com/cgi-bin/
 mailman/listinfo/time-nuts
 and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Loran-C radio navigation

[Robert Watson]

Matthias,

I am based near Bristol in the South West of the UK. I can receive Anthorn
in the UK and several of the French chain of transmitters - I have a
prototype UrsaNav Loran receiver. Have a reasonably equipped lab for
timing; GPS disciplined SRS FS725 rubidium and an Agilent 53230A TIC. Let
me know if I can help,

Regards,

Robert.


On 13 January 2014 16:11, Matthias Koch
matthias.k...@hot.uni-hannover.dewrote:

 Dear timing geeks and frequency wizards,

 I wish to announce a software defined Loran-C longwave radio navigation
 receiver running on STM32F407 ! If you happen to live somewhere on earth
 with Loran-C signal coverage like Europe and parts of Asia, I would like to
 get in contact with you for beta testing out in the wild.

 The first experimental release is available now on download section on
 http://mecrisp.sourceforge.net/
 I have been invited to this list by a discussion on
 http://forum.stellarisiti.com/topic/1807-loran-c-radio-navigation/

 Best wishes from Germany,
 Matthias Koch
 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to https://www.febo.com/cgi-bin/
 mailman/listinfo/time-nuts
 and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] SRS PRS10 problem

[Robert Watson]

Hi folks,

OK, have found the manual and it's not as bad as I remembered; there
are six 17x11 fold out sheets. The schematics are dated August 12th
1999 and are for Revsion H. I'll scan the schematics and the parts
list in case that helps folks with non rev. H units. There are no
copies of the silkscreens for component ident as near as I can see.
Will see if I can scan these in the next couple of days.

R.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] SRS PRS10 problem

[Robert Watson]

OK, Here is the result of my lunch-break scanning session. I had to
use a desktop A4 sized scanner so you might need scissors and tape to
make sense. The 17x11 sheets are split onto overlapping two letter
sized pages (Rb lamp driver is on last couple of pages). Don't have
time to tidy it at this stage.

Usual caveats: link may not be around forever so if someone wants to
find a better home for it, do so. For personal use only etc.
http://people.bath.ac.uk/eesrjw/prs10/PRS10_revH_BoM_schematics.pdf

Regards,
R.

On 23 February 2011 09:04, Robert Watson
robertwatsonb...@googlemail.com wrote:
 Hi folks,

 OK, have found the manual and it's not as bad as I remembered; there
 are six 17x11 fold out sheets. The schematics are dated August 12th
 1999 and are for Revsion H. I'll scan the schematics and the parts
 list in case that helps folks with non rev. H units. There are no
 copies of the silkscreens for component ident as near as I can see.
 Will see if I can scan these in the next couple of days.

 R.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] SRS PRS10 problem

[Robert Watson]

Hi,

I have a ring-bound original paper copy PRS10 manual somewhere.
Assuming I can find it, I can probably scan  PDF the appropriate
pages - the schematics are on fold out  pages if I recall so it might
be a bit of a jigsaw puzzle!

Regards,

Rob.

On 18 February 2011 21:08, Henk h...@deriesp.demon.nl wrote:
 Hi,

 Nice to read that there are PRS10 circuit diagrams on paper available. Did 
 somebody scan them?
 If yes, can that scam made available to the list?

 Henk


 Op 17 feb 2011, om 22:55 heeft Laurence Motteram het volgende geschreven:

 I would just like to point out that SRS is one of the few companies who
 still provide complete manuals with parts lists and circuit diagrams
 (although circuits are only in the paper manuals, not the pdfs).


 Regards,

 Laurence Motteram


 -Original Message-
 From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
 Behalf Of J. Forster
 Sent: Friday, 18 February 2011 8:11 AM
 To: shali...@gmail.com; Discussion of precise time and frequency
 measurement
 Subject: Re: [time-nuts] SRS PRS10 problem

 I've had such blowoffs from SRS, simply asking for a schematic of an old
 power supply. Uncooperative and unhelpful is a total understatement.

 I will never buy any of their stuff again. I simply don't care if it is
 the best in the world (which it is probably not the case), if the
 documentation and other minimal support is not available, they are
 simply
 a company not worth dealing with.

 Even if I got it free, it's still not worth half the price.

 YMMV,

 -John

 =


 I wanted to say those customers who bought them new directly from
 them

 While I do not agree with the practice, many companies treat their
 primary
 customers better than those who buy aftermarket.

 What is relevant is what the vendor believes is relevant. What you and
 I
 think about it IS irrelevant.

 They do not want to exert control on who owns it later, but they exert
 control on what they do with their spares.

 Its a fact of life.

 Didier KO4BB

 Sent from my Verizon Wireless BlackBerry

 -Original Message-
 From: Magnus Danielson mag...@rubidium.dyndns.org
 Sender: time-nuts-boun...@febo.com
 Date: Thu, 17 Feb 2011 18:26:41
 To: time-nuts@febo.com
 Reply-To: Discussion of precise time and frequency measurement
      time-nuts@febo.com
 Subject: Re: [time-nuts] SRS PRS10 problem

 On 02/17/2011 12:23 PM, shali...@gmail.com wrote:
 It sucks, but they may only have a small qty of the spares, and they
 keep them for those customers who paid full price.

 Full price?

 Someone payed full price for it originally. The notion that can have
 control over who owns it later is strange and not relevant. Sending it
 to them for repairs may be possible thought.

 Cheers,
 Magnus

 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.
 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.





 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to
 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.

 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.


 ___
 time-nuts mailing list -- time-nuts@febo.com
 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.