[time-nuts] Racal OCXO Option 04E
ABC Electronics (unknown to me) has listed on eBay as Item 330706988007 seven Racal 9462 P/N 454879 Rev A ocxo supplied by Racal as Option 04E. The seller describes these as 5 MHz but the picture shows the Racal frequency doubler board on the end of the ocxo can so the output is actually 10 MHz, as used on Racal 1992 and 1999 (and, other) counters. Several on the list here have inquired about this ocxo and wondered how to get one as a replacement part. Here is an opportunity to purchase just the ocxo. I have no connection to the seller and am just reporting the offering. This is the High Stability option for numerous Racal counters, the best performing ocxo Racal offered. It has COARSE and FINE frequency adjustments under access screws from the rear panel of the counters. It is an easy drop-in replacement for Racal Option 04A and 04C, both far inferior to Option 04E. -- Best wishes, Larry McDavid W6FUB Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland) ___ 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] CW12-TIM
Tom Knox: Has anyone played with the CW12-TIM? I am hoping it is a plug and play replacement for the M12+ in my Commsync II with better performance. + I have no idea if it will work but from my experience with trying to upgrade my Odetics 365 to a 565, there is a chance you might run into a problem. My 365 was built around 1998 and the 565 about 2005 but the main boards looked identical with the exception of the revision on a 27c010 EPROM. I put just the receiver board from the 565 into the 365 and it would not work. By putting both the 565 receiver board and the 565 EPROM into the 365 it worked and acted just like the original 565. It appeared that the EPROM contained some information or code that only let it talk to certain receiver boards. Robert Atkinson posted he had worked for Odetics when the change was made and that both receiver and firmware changes were made. My 565 used a M12+ on a Synergy Systems adapter board to make it look like a UT+ board so I then substituted a Motorola UT+ GPS receiver into the receiver in place of the M12+ and its adapter board and it did work and the display reported it correctly. Looking at the spec sheet I'd say the CW12-TIM would be worth a try as it isn't that expensive and the specs look really good. Both receivers seem to speak the same language where the original receiver in my 365 was an old Magellan which apparently was way different than the M12+/UT+ that worked with the new firmware. The fact that the CW12-TIM can look like the M12+ makes me think it will work as a replacement but there is a chance that it won't depending what the firmware checks. I'm glad you're getting a CW12-TIM to check it out to save me from the gamble. I might be willing to try one of the CW12-TIM boards on the Synergy Systems adapter board as a replacement for my M12+ if you have good luck. I would still have to use the Synergy Systems adapter board that is needed to interface the M12+ to the main board in the 565 to make it fit into the UT+ footprint but the big gain in the 1PPS stability should be unaffected. Please keep us posted on your progress. -Arthur ___ 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] Red Box T'bolt (was: Trimble T'Bolt)
Hi All, I purchased one of these red box t'bolt from this Israeli seller and it arrived a couple of days ago. I can confirm it has the Trimble labeled OXCO and firmware FW2.12. Also interesting is that it seems to run happily with the supply backed off to 17V. I've taken some pics with the boards spread out and uploaded them to Didiers site. The file is called RedBoxThunderbolt.pdf and should be available shortly. As with many things found on fleabay, a gamble is involved. In this case it seems to have paid off. Is it possible (and is there any benefit) in updating the firmware? cheers, ian Date: Fri, 23 Mar 2012 09:47:59 -0400 (EDT) From: gandal...@aol.com To: time-nuts@febo.com Subject: Re: [time-nuts] Trimble T'Bolt Message-ID: 58ef1.677b829b.3c9dd...@aol.com Content-Type: text/plain; charset=US-ASCII Hi Stan With a 99 date code that's looking pretty old and will more than likely have the earlier Piezo oscillator as per John's comments here _http://www.ke5fx.com/tbolt.htm_ (http://www.ke5fx.com/tbolt.htm) It's certainly not one I'd go for. Regards Nigel GM8PZR In a message dated 23/03/2012 13:34:42 GMT Standard Time, stanw...@verizon.net writes: Hello The Net, On Ebay: 120880795618 Is this a very old T'Bolt or the newer e T'Bolt ? I like the single power supply even though it is 24VDC Stan, W1LECape Cod ___ ___ 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] Red Box T'bolt (was: Trimble T'Bolt)
Hi Ian That sounds encouraging, what's the date code on yours? I seem to recall previous discussions here regarding the possibility of firmware upgrades and am pretty sure the answer was No. My current Tbolts have firmware 3.xx but I have had some in the past with version 2.xx and don't recall any obvious differences. regards Nigel GM8PZR In a message dated 24/03/2012 12:40:41 GMT Standard Time, cadbl...@hotmail.com writes: Hi All, I purchased one of these red box t'bolt from this Israeli seller and it arrived a couple of days ago. I can confirm it has the Trimble labeled OXCO and firmware FW2.12. Also interesting is that it seems to run happily with the supply backed off to 17V. I've taken some pics with the boards spread out and uploaded them to Didiers site. The file is called RedBoxThunderbolt.pdf and should be available shortly. As with many things found on fleabay, a gamble is involved. In this case it seems to have paid off. Is it possible (and is there any benefit) in updating the firmware? cheers, ian ___ 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] NIST Traceability [WAS: WWVB BPSK...]
Charles wrote: And even with a WWVB reference, one needs an internal measurement assurance program to support a claim of traceability for the measurements that one makes. Correct. You must not only maintain a laboratory condition for your lab, but you must keep - and validate - your phase data. Just having the lock light ON at the time of measurement is insufficient. I've run a metrology lab in the past, so the methods and procedures for both the electronic and mechanical standards aren't lost on me.. But having the oscillator broken is a dead-nuts failure.That's not lost on me either. ___ 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] Anyone familiar with SR-620 repair?
MW or LW IR cameras are not exactly home shop stuff Peter. -John == I had a HP 3326 which had a power supply in foldback. All the modules are inaccessible unless you have a rather rare set of extenders anyway. The voltmeter method quickly led me to the board and a bench supply and meter again to the shorted cap. Very easy. Other times I've borrowed the FLIR camera from work, also taught the new EEs that trick as well. It is a true lifesaver on dense surface mount boards. I haven't tried the liquid crystal sheet but it seems like an interesting idea so long as everything is about the same height. Peter On Mar 23, 2012, at 11:53 PM, li...@lazygranch.com wrote: Prior to emission or IR microscope technology, liquid crystals was how you found hotspots on ICs. I've done this with a goop that you dispense with a syringe. One trick to make this more sensitive is you bring a soldering iron close to the liquid crystals. Not so close as to cause a change, but you get them closer to the phase change point. -Original Message- From: Skip Withrow skip.with...@gmail.com Sender: time-nuts-boun...@febo.com Date: Fri, 23 Mar 2012 21:07:45 To: time-nuts@febo.com Reply-To: swith...@alum.mit.edu, Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Anyone familiar with SR-620 repair? You don't need expensive test equipment to find this kind of problem. What I use is a sheet of liquid crystal film with a transition temperature just slightly above your room temperature. Just lay it on the circuit board and you can find where the power is being dissipated (even if pretty small) by watching the colors change. I think Omega Engineering sells a 8.5 x 11 sheet for about $18 if memory serves me. I have used this trick many times and it works great to find shorted (bypass) caps. No disconnecting anything, no milliohm meters, no 4 or 5 digit voltmeters. Regards, Skip Withrow ___ 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.
Re: [time-nuts] Red Box T'bolt (was: Trimble T'Bolt)
Hi Nigel, I knew I'd leave out something! The date code is 0025 cheers, ian Hi Ian That sounds encouraging, what's the date code on yours? I seem to recall previous discussions here regarding the possibility of firmware upgrades and am pretty sure the answer was No. My current Tbolts have firmware 3.xx but I have had some in the past with version 2.xx and don't recall any obvious differences. regards Nigel GM8PZR In a message dated 24/03/2012 12:40:41 GMT Standard Time, cadbloke at hotmail.com writes: Hi All, I purchased one of these red box t'bolt from this Israeli seller and it arrived a couple of days ago. I can confirm it has the Trimble labeled OXCO and firmware FW2.12. Also interesting is that it seems to run happily with the supply backed off to 17V. I've taken some pics with the boards spread out and uploaded them to Didiers site. The file is called RedBoxThunderbolt.pdf and should be available shortly. As with many things found on fleabay, a gamble is involved. In this case it seems to have paid off. Is it possible (and is there any benefit) in updating the firmware? cheers, ian ___ 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] Anyone familiar with SR-620 repair?
Nope. The cap was cool because the thing was shorted and had no voltage across it. Power is V * I. As I said before, either an open or a short circuited component dissipates no power. The defective component is NOT always the hot one. A hot component is only a pointer to the fault, not necessarily the problem itself. This is especially true of fuses. Always ask Why did the fuse blow?? -John = I just tracked down a shorted tantalum in a Tektronix DM501 multimeter. It was on the output of the floating -12 volt supply bridge rectifier before the regulator. The current level was so low that it never heated up although I burned two fingers on the push-pull output transistors for the floating supply. The regulator is on a separate module but the supply was still shorted when I pulled it and the bad tantalum was the only part left. I have not seen a shorted tantalum before where it could not be surge current related until now. On Sat, 24 Mar 2012 00:08:12 -0400, Peter Gottlieb n...@verizon.net wrote: I had a HP 3326 which had a power supply in foldback. All the modules are inaccessible unless you have a rather rare set of extenders anyway. The voltmeter method quickly led me to the board and a bench supply and meter again to the shorted cap. Very easy. Other times I've borrowed the FLIR camera from work, also taught the new EEs that trick as well. It is a true lifesaver on dense surface mount boards. I haven't tried the liquid crystal sheet but it seems like an interesting idea so long as everything is about the same height. Peter On Mar 23, 2012, at 11:53 PM, li...@lazygranch.com wrote: Prior to emission or IR microscope technology, liquid crystals was how you found hotspots on ICs. I've done this with a goop that you dispense with a syringe. One trick to make this more sensitive is you bring a soldering iron close to the liquid crystals. Not so close as to cause a change, but you get them closer to the phase change point. -Original Message- From: Skip Withrow skip.with...@gmail.com Sender: time-nuts-boun...@febo.com Date: Fri, 23 Mar 2012 21:07:45 To: time-nuts@febo.com Reply-To: swith...@alum.mit.edu, Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Anyone familiar with SR-620 repair? You don't need expensive test equipment to find this kind of problem. What I use is a sheet of liquid crystal film with a transition temperature just slightly above your room temperature. Just lay it on the circuit board and you can find where the power is being dissipated (even if pretty small) by watching the colors change. I think Omega Engineering sells a 8.5 x 11 sheet for about $18 if memory serves me. I have used this trick many times and it works great to find shorted (bypass) caps. No disconnecting anything, no milliohm meters, no 4 or 5 digit voltmeters. ___ 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] Red Box T'bolt (was: Trimble T'Bolt)
Thanks Ian Sounds like my original comments were somewhat over pessimistic then! I was under the impression that the crossover between oscillators was around 2002 but obviously it must have been quite a bit earlier. regards Nigel GM8PZR In a message dated 24/03/2012 13:38:10 GMT Standard Time, cadbl...@hotmail.com writes: Hi Nigel, I knew I'd leave out something! The date code is 0025 cheers, ian Hi Ian That sounds encouraging, what's the date code on yours? I seem to recall previous discussions here regarding the possibility of firmware upgrades and am pretty sure the answer was No. My current Tbolts have firmware 3.xx but I have had some in the past with version 2.xx and don't recall any obvious differences. regards Nigel GM8PZR In a message dated 24/03/2012 12:40:41 GMT Standard Time, cadbloke at hotmail.com writes: Hi All, I purchased one of these red box t'bolt from this Israeli seller and it arrived a couple of days ago. I can confirm it has the Trimble labeled OXCO and firmware FW2.12. Also interesting is that it seems to run happily with the supply backed off to 17V. I've taken some pics with the boards spread out and uploaded them to Didiers site. The file is called RedBoxThunderbolt.pdf and should be available shortly. As with many things found on fleabay, a gamble is involved. In this case it seems to have paid off. Is it possible (and is there any benefit) in updating the firmware? cheers, ian ___ 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] Racal OCXO Option 04E
Hi Larry; I have known of ABC since I went to the UofMinn in the 70's. Peter is the current owner and I have really enjoyed getting to know him during my purchases over the years. I have purchased many items from him over the years ranging from old manuals and small parts to new in the box Agilent 3458A's. I think they still have a retail store front in MPLS MINN. I have found him to be very fair during those dealings. I highly recommend ABC. Thomas Knox Date: Sat, 24 Mar 2012 00:36:03 -0700 From: lmcda...@lmceng.com To: time-nuts@febo.com Subject: [time-nuts] Racal OCXO Option 04E ABC Electronics (unknown to me) has listed on eBay as Item 330706988007 seven Racal 9462 P/N 454879 Rev A ocxo supplied by Racal as Option 04E. The seller describes these as 5 MHz but the picture shows the Racal frequency doubler board on the end of the ocxo can so the output is actually 10 MHz, as used on Racal 1992 and 1999 (and, other) counters. Several on the list here have inquired about this ocxo and wondered how to get one as a replacement part. Here is an opportunity to purchase just the ocxo. I have no connection to the seller and am just reporting the offering. This is the High Stability option for numerous Racal counters, the best performing ocxo Racal offered. It has COARSE and FINE frequency adjustments under access screws from the rear panel of the counters. It is an easy drop-in replacement for Racal Option 04A and 04C, both far inferior to Option 04E. -- Best wishes, Larry McDavid W6FUB Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland) ___ 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] CW12-TIM
Thomas, where did you buy your CW-12? AFAIK, the Motorola version of the CW-12 is a 'special order' item. You can only buy the NMEA version. If you did buy the NMEA version, ask their tech support for the Motorola firmware. They sent it to me and I flashed it with no problem. If you decide not to use the CW-12 in your Commsync and think you might like to play with the 10 MHz output, there was an issue with the frequency of that output. Search the archives for details. I can provide the updated firmware that resolves the issue. Ed On 3/23/2012 7:36 PM, Tom Knox wrote: I have already bite the bullet, After reading the manual I thought it was worth a try. It should arrive Tuesday. So next week I will post what I find. Thanks; Thomas Knox Date: Fri, 23 Mar 2012 19:17:06 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Sorry Thomas. I don't know a thing about the Commsync II. See what you can dig out of the manuals. Ultimately, you might have to bite the bullet and buy a CW12 to try it. Sometimes that's the only way to find out. Ed On 3/23/2012 6:10 PM, Tom Knox wrote: Thanks Ed, My Commsync has the LPN clean up oscillator option do you think that will clean up the sawtooth? Thomas Knox Date: Fri, 23 Mar 2012 16:56:50 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Yes, the CW12-TIM was designed as a drop-in replacement for the M12+. Search the archives and you'll find out more about it. One thing to note is that the CW12-TIM doesn't support sawtooth correction so the 1 PPS may or may not be an improvement over the M12+. Ed On 3/23/2012 3:16 PM, Tom Knox wrote: Hi Group; Has anyone played with the CW12-TIM? I am hoping it is a plug and play replacement for the M12+ in my Commsync II with better performance. Is there any other product I should look at? Thanks; Thomas Knox ___ 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] Anyone familiar with SR-620 repair?
The capacitor was cool in this case because the floating supply was current limited do to the design so the power dissipation was limited. The transistors driving the isolation transformer were beta limited and the output current after the transformer was on the order of 200 milliamps. Had the capacitor been on the input side, the short circuit current would have been an order of magnitude or two higher and I expect it would have been hot or even caught on fire. The only thing that made it easy to find was that removing the post regulator as a module left only that one capacitor in the circuit. I actually have a far IR camera but did not get to breaking it out for this project. I did manage to burn two Mark I Fingers though on the metal transistor cans. The DM501 I fixed supports a simple delta Vbe temperature probe so at some point I think I will build one. All I need is the LEMO connector. I would really like to know though why it failed in a non-surge related way at such a low current level. Previously I have only seen them fail where it could have been surge current related. On Sat, 24 Mar 2012 06:45:12 -0700 (PDT), J. Forster j...@quikus.com wrote: Nope. The cap was cool because the thing was shorted and had no voltage across it. Power is V * I. As I said before, either an open or a short circuited component dissipates no power. The defective component is NOT always the hot one. A hot component is only a pointer to the fault, not necessarily the problem itself. This is especially true of fuses. Always ask Why did the fuse blow?? -John = I just tracked down a shorted tantalum in a Tektronix DM501 multimeter. It was on the output of the floating -12 volt supply bridge rectifier before the regulator. The current level was so low that it never heated up although I burned two fingers on the push-pull output transistors for the floating supply. The regulator is on a separate module but the supply was still shorted when I pulled it and the bad tantalum was the only part left. I have not seen a shorted tantalum before where it could not be surge current related until now. On Sat, 24 Mar 2012 00:08:12 -0400, Peter Gottlieb n...@verizon.net wrote: I had a HP 3326 which had a power supply in foldback. All the modules are inaccessible unless you have a rather rare set of extenders anyway. The voltmeter method quickly led me to the board and a bench supply and meter again to the shorted cap. Very easy. Other times I've borrowed the FLIR camera from work, also taught the new EEs that trick as well. It is a true lifesaver on dense surface mount boards. I haven't tried the liquid crystal sheet but it seems like an interesting idea so long as everything is about the same height. Peter On Mar 23, 2012, at 11:53 PM, li...@lazygranch.com wrote: Prior to emission or IR microscope technology, liquid crystals was how you found hotspots on ICs. I've done this with a goop that you dispense with a syringe. One trick to make this more sensitive is you bring a soldering iron close to the liquid crystals. Not so close as to cause a change, but you get them closer to the phase change point. -Original Message- From: Skip Withrow skip.with...@gmail.com Sender: time-nuts-boun...@febo.com Date: Fri, 23 Mar 2012 21:07:45 To: time-nuts@febo.com Reply-To: swith...@alum.mit.edu, Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Anyone familiar with SR-620 repair? You don't need expensive test equipment to find this kind of problem. What I use is a sheet of liquid crystal film with a transition temperature just slightly above your room temperature. Just lay it on the circuit board and you can find where the power is being dissipated (even if pretty small) by watching the colors change. I think Omega Engineering sells a 8.5 x 11 sheet for about $18 if memory serves me. I have used this trick many times and it works great to find shorted (bypass) caps. No disconnecting anything, no milliohm meters, no 4 or 5 digit voltmeters. ___ 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] TBolt-PRS10
Having a M12+Timing GPS driving the 1 Hz input of my PRS10. I decided to upgrade my house referenc switching to a Tbolt as the 1 Hz source. First I did some time analysis using my HP 5372A controlled by my FTS 4060 Cesium standard that I did turn on beam current three days ago to allow it to settle. Tests showed maximum deviation of 2 nsec with the Tbolt over 1000 seconds and 63 nsec with the GPS (20 nsec with Sawtooth Correction) Again 1000 seconds. Plot's are available but exceed attachment size. The output of the PRS10 in turn disciplines an Oscilloquartz 8600. Here are my questions: Are 2 nsec acceptable for a Tbolt What should the Tbolt loop time be for this application What should the loop time be for the PRS10 What is the long term performance of the Tbolt and what is the contribution due to the GPS signal. What is the resolution of the Tbolt detecting and correcting the 1 pps and is it done by changing the OCXO frequency for short periods. My tests show a slight change. Does any one have a similar setup using a Tbolt and 1 pps input to a PRS10 and experience to share. Thanks for any help. Juerg ___ 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] CW12-TIM
Thanks Ed, You may have saved me a headache. The only place I found the CW12-TIM was semiconductorstore.com and they did not know anything about them. I did not realize there were different firmware versions, After reading the manual, I thought it would just recognize NMEA 0183 and Motorola Binary. All thru their literature they keep claiming M12 compatible never clearly mentioning different versions. Typical. the Commsymc II manual, like most other commercial GPS manuals offers nothing useful. They do not even explain what a number of different jumpers do. I am sure one is for 5VDC or 3.3VDC I could only guess at the rest. I am interested in the firmware to fix the 10MHz issue in case I ever utilize the variable freq output. Thanks Again; Thomas Knox Date: Sat, 24 Mar 2012 10:55:01 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Thomas, where did you buy your CW-12? AFAIK, the Motorola version of the CW-12 is a 'special order' item. You can only buy the NMEA version. If you did buy the NMEA version, ask their tech support for the Motorola firmware. They sent it to me and I flashed it with no problem. If you decide not to use the CW-12 in your Commsync and think you might like to play with the 10 MHz output, there was an issue with the frequency of that output. Search the archives for details. I can provide the updated firmware that resolves the issue. Ed On 3/23/2012 7:36 PM, Tom Knox wrote: I have already bite the bullet, After reading the manual I thought it was worth a try. It should arrive Tuesday. So next week I will post what I find. Thanks; Thomas Knox Date: Fri, 23 Mar 2012 19:17:06 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Sorry Thomas. I don't know a thing about the Commsync II. See what you can dig out of the manuals. Ultimately, you might have to bite the bullet and buy a CW12 to try it. Sometimes that's the only way to find out. Ed On 3/23/2012 6:10 PM, Tom Knox wrote: Thanks Ed, My Commsync has the LPN clean up oscillator option do you think that will clean up the sawtooth? Thomas Knox Date: Fri, 23 Mar 2012 16:56:50 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Yes, the CW12-TIM was designed as a drop-in replacement for the M12+. Search the archives and you'll find out more about it. One thing to note is that the CW12-TIM doesn't support sawtooth correction so the 1 PPS may or may not be an improvement over the M12+. Ed On 3/23/2012 3:16 PM, Tom Knox wrote: Hi Group; Has anyone played with the CW12-TIM? I am hoping it is a plug and play replacement for the M12+ in my Commsync II with better performance. Is there any other product I should look at? Thanks; Thomas Knox ___ 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] Book by William Riley
On 03/13/2012 07:47 AM, Ed Palmer wrote: I see that William Riley ( author of Stable32) has published a book on Rubidium Standards. Has anyone seen a copy? Any reviews? http://www.lulu.com/product/paperback/rubidium-frequency-standard-primer/18171341 I don't have any connection to Mr. Riley or Lulu Marketplace. Can't even afford his software! :-( I ordered both the Rubidium Frequency Standard Primer and the Hanbook of Frequency Stability Analysis. Today I picked them up. The Rubidium primer looks comprehensive and lots of nice photos. I will have to read it to make a more qualitative evaluation of it. Some of the illustrations where fuzzy, so there could be some improvement on the picture material. It is relatively rich on photos, both of units and components. Looks promising. Might not be the definite reference for the experts, but will sure be a handy collection of things and also a great index for the 358 references. I'll have another 5065A to get into operational order. Guess I'll try fixing the last thing as I need to turn of the lights in the lab anyway... :) 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.
Re: [time-nuts] TBolt-PRS10
Upgrade to a TBolt from what? If you have a M12+ disciplined PRS10 what else can be better? Great short time stability given by the Rb (and what a Rb, a Stanford Research PRS10), great long term accuracy given by the M12+... On Sat, Mar 24, 2012 at 8:22 PM, Jürg Kögel j.koeg...@gmail.com wrote: Having a M12+Timing GPS driving the 1 Hz input of my PRS10. I decided to upgrade my house referenc switching to a Tbolt as the 1 Hz source. First I did some time analysis using my HP 5372A controlled by my FTS 4060 Cesium standard that I did turn on beam current three days ago to allow it to settle. Tests showed maximum deviation of 2 nsec with the Tbolt over 1000 seconds and 63 nsec with the GPS (20 nsec with Sawtooth Correction) Again 1000 seconds. Plot's are available but exceed attachment size. The output of the PRS10 in turn disciplines an Oscilloquartz 8600. Here are my questions: Are 2 nsec acceptable for a Tbolt What should the Tbolt loop time be for this application What should the loop time be for the PRS10 What is the long term performance of the Tbolt and what is the contribution due to the GPS signal. What is the resolution of the Tbolt detecting and correcting the 1 pps and is it done by changing the OCXO frequency for short periods. My tests show a slight change. Does any one have a similar setup using a Tbolt and 1 pps input to a PRS10 and experience to share. Thanks for any help. Juerg ___ 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] CW12-TIM
That's the same place I got mine. They made the same mistake, but helped me get the Motorola firmware. The CW-12 is also available from Janus Remote Communications (Navsync and Janus are part of Connor-Winfield). They have two warnings on the CW-12 page about the Motorola firmware. As for the variable frequency output, it's only variable with the NMEA load. Whoever paid Navsync to create the Motorola firmware apparently wasn't interested in the variable frequency output so there's no command to change the frequency. It's fixed at 10 MHz. So you can have variable frequency, or you can have a Motorola-compatible timing receiver with TRAIM. Sigh. Connor-Winfield provided me with the firmware, but asked me not to post the link. I'll send it off-list. Ed On 3/24/2012 3:07 PM, Tom Knox wrote: Thanks Ed, You may have saved me a headache. The only place I found the CW12-TIM was semiconductorstore.com and they did not know anything about them. I did not realize there were different firmware versions, After reading the manual, I thought it would just recognize NMEA 0183 and Motorola Binary. All thru their literature they keep claiming M12 compatible never clearly mentioning different versions. Typical. the Commsymc II manual, like most other commercial GPS manuals offers nothing useful. They do not even explain what a number of different jumpers do. I am sure one is for 5VDC or 3.3VDC I could only guess at the rest. I am interested in the firmware to fix the 10MHz issue in case I ever utilize the variable freq output. Thanks Again; Thomas Knox Date: Sat, 24 Mar 2012 10:55:01 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Thomas, where did you buy your CW-12? AFAIK, the Motorola version of the CW-12 is a 'special order' item. You can only buy the NMEA version. If you did buy the NMEA version, ask their tech support for the Motorola firmware. They sent it to me and I flashed it with no problem. If you decide not to use the CW-12 in your Commsync and think you might like to play with the 10 MHz output, there was an issue with the frequency of that output. Search the archives for details. I can provide the updated firmware that resolves the issue. Ed On 3/23/2012 7:36 PM, Tom Knox wrote: I have already bite the bullet, After reading the manual I thought it was worth a try. It should arrive Tuesday. So next week I will post what I find. Thanks; Thomas Knox Date: Fri, 23 Mar 2012 19:17:06 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Sorry Thomas. I don't know a thing about the Commsync II. See what you can dig out of the manuals. Ultimately, you might have to bite the bullet and buy a CW12 to try it. Sometimes that's the only way to find out. Ed On 3/23/2012 6:10 PM, Tom Knox wrote: Thanks Ed, My Commsync has the LPN clean up oscillator option do you think that will clean up the sawtooth? Thomas Knox Date: Fri, 23 Mar 2012 16:56:50 -0600 From: ed_pal...@sasktel.net To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM Yes, the CW12-TIM was designed as a drop-in replacement for the M12+. Search the archives and you'll find out more about it. One thing to note is that the CW12-TIM doesn't support sawtooth correction so the 1 PPS may or may not be an improvement over the M12+. Ed On 3/23/2012 3:16 PM, Tom Knox wrote: Hi Group; Has anyone played with the CW12-TIM? I am hoping it is a plug and play replacement for the M12+ in my Commsync II with better performance. Is there any other product I should look at? Thanks; Thomas Knox ___ 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] Racal OCXO Option 04E
I have one in my counter and it has excellent performance. On 3/24/2012 3:36 AM, Larry McDavid wrote: ABC Electronics (unknown to me) has listed on eBay as Item 330706988007 seven Racal 9462 P/N 454879 Rev A ocxo supplied by Racal as Option 04E. The seller describes these as 5 MHz but the picture shows the Racal frequency doubler board on the end of the ocxo can so the output is actually 10 MHz, as used on Racal 1992 and 1999 (and, other) counters. Several on the list here have inquired about this ocxo and wondered how to get one as a replacement part. Here is an opportunity to purchase just the ocxo. I have no connection to the seller and am just reporting the offering. This is the High Stability option for numerous Racal counters, the best performing ocxo Racal offered. It has COARSE and FINE frequency adjustments under access screws from the rear panel of the counters. It is an easy drop-in replacement for Racal Option 04A and 04C, both far inferior to Option 04E. ___ 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.
