[time-nuts] HP5061B Beam Tubes
Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] HP5061B Beam Tubes
Hi That link does not lead to anything. Bob On Sep 23, 2013, at 2:57 AM, cdel...@juno.com wrote: Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] HP5061B Beam Tubes
http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf That link does not lead to anything. Line wrap. You have to glue the pieces back together. -- These are my opinions. I hate spam. ___ 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] HP5061B Beam Tubes
It does if you append the bit in the following line ie append ing_instructions.pdf. to form: http://www.symmetricom.com/media/files/downloads/product-datasheets/shipping_instructions.pdf Bruce Bob Camp wrote: Hi That link does not lead to anything. Bob On Sep 23, 2013, at 2:57 AM, cdel...@juno.com wrote: Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] HP5061B Beam Tubes
On 9/23/2013 7:32 AM, Bob Camp wrote: On Sep 23, 2013, at 2:57 AM, cdel...@juno.com wrote: Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf That link does not lead to anything. It works fine, and points to a pdf containing Shipping Instructions for Caesium Devices You do have to put the link back together, since it's longer than the convention for line length. ___ 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] HP5061B Beam Tubes
Link works for me but you must copy the ENTIRE link for it to work. On 9/23/2013 7:32 AM, Bob Camp wrote: http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf ___ 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] Line wrapping cure [WAS: HP5061B Beam Tubes]
You do have to put the link back together, since it's longer than the convention for line length. If everyone would adopt the habit of putting links in angle brackets when they post, line wrapping would not be a problem. All mail clients that I'm familiar with know to keep a link together if it is inside angle brackets (no doubt there are some that don't -- YMMV). (Parentheses work also, but not as universally as angle brackets.) For example: http://www.torchmate.com/Hypertherm plasma cutter TORCHMATE CNC shape cutting machine -- the perfect combination. Kits starting at under $2,000. - robotics, motion control systems, automated shape cutting, automation, cnc cutting tables, metal art, ornamental iron, wrought iron, automated welding, automated cutting Best regards, Charles ___ 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] Line wrapping cure [WAS: HP5061B Beam Tubes]
Oops -- not a good example (only the first bit was the link address). It does work Charles You do have to put the link back together, since it's longer than the convention for line length. If everyone would adopt the habit of putting links in angle brackets when they post, line wrapping would not be a problem. All mail clients that I'm familiar with know to keep a link together if it is inside angle brackets (no doubt there are some that don't -- YMMV). (Parentheses work also, but not as universally as angle brackets.) For example: ___ 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] HP5061B Beam Tubes
Thanks Corby for adding the link, I should have provided the link in my earlier post. The shipping concern is because Cesium or Caesium metal is highly reactive and very pyrophoric. In addition to igniting spontaneously in air, it reacts explosively with water even at low temperatures, but the small amount of actual Cesium in a Cesium standard as well as the hardening provided by that tube structure were important factors in it's exemption. I have recieved and shipped Cesium standards both in the USA and internaionally using the DOT exemption with no problem. I have a hard case designed specifically for that purpose which came with a Datum 4065C but is also perfect for the 5071A. It has all the critical warning and exemption information in metal labels riveted to the outside of the case. I have seen these cases on eBay from time to time. Be aware there is a limit of how many Cesium standard can be shipped at once under the exemption, I think it is five. Not really a factor for most of us. In any case I would use extreme caution if you ever open one for examination. To bad some industrious Time-Nut has not started a small business rebuilding Depleted Tubes. I have heard that failure often occurs when Cesium becomes mixed with contaminants and stuck to the enclosure walls, and there is a method to remove it. I know increasing the cell temp brings some standards back to life. And perhaps after heating and boiling the Cesium off he walls the cleaner tube can then be returned to factory settings? I am sure a number of you have far more expertise and have experimented with these ideas to determine whether there is any truth to these tall tails. If so I am sure I am not the only one that would enjoy hearing what you know, perhaps on a new thread. Thanks; Thomas Knox To: time-nuts@febo.com Date: Sun, 22 Sep 2013 23:57:43 -0700 From: cdel...@juno.com Subject: [time-nuts] HP5061B Beam Tubes Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] HP5061B Beam Tubes
Hi Paul; I have heard that it is not so much loss of Cesium, but the Cesium and contaminate mix sticking to the enclosure walls. The increased heat boils some of the gunk off. My question is what if you REALLY heat up the tube for a fairly short period? How much have you increased temp? and have you tried returning to original setting once it has locked again? Thomas Knox Date: Mon, 23 Sep 2013 14:29:06 -0400 From: paulsw...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] HP5061B Beam Tubes Tom As far as heating goes thats what I have done and it does work to an extent. I still have very low beam. Thats what amazes me most is the darn thing actually locks by itself. So increasing the temperature is worth a try. Regards Paul. On Mon, Sep 23, 2013 at 2:16 PM, Tom Knox act...@hotmail.com wrote: Thanks Corby for adding the link, I should have provided the link in my earlier post. The shipping concern is because Cesium or Caesium metal is highly reactive and very pyrophoric. In addition to igniting spontaneously in air, it reacts explosively with water even at low temperatures, but the small amount of actual Cesium in a Cesium standard as well as the hardening provided by that tube structure were important factors in it's exemption. I have recieved and shipped Cesium standards both in the USA and internaionally using the DOT exemption with no problem. I have a hard case designed specifically for that purpose which came with a Datum 4065C but is also perfect for the 5071A. It has all the critical warning and exemption information in metal labels riveted to the outside of the case. I have seen these cases on eBay from time to time. Be aware there is a limit of how many Cesium standard can be shipped at once under the exemption, I think it is five. Not really a factor for most of us. In any case I would use extreme caution if you ever open one for examination. To bad some industrious Time-Nut has not started a small business rebuilding Depleted Tubes. I have heard that failure often occurs when Cesium becomes mixed with contaminants and stuck to the enclosure walls, and there is a method to remove it. I know increasing the cell temp brings some standards back to life. And perhaps after heating and boiling the Cesium off he walls the cleaner tube can then be returned to factory settings? I am sure a number of you have far more expertise and have experimented with these ideas to determine whether there is any truth to these tall tails. If so I am sure I am not the only one that would enjoy hearing what you know, perhaps on a new thread. Thanks; Thomas Knox To: time-nuts@febo.com Date: Sun, 22 Sep 2013 23:57:43 -0700 From: cdel...@juno.com Subject: [time-nuts] HP5061B Beam Tubes Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] HP5061B Beam Tubes
Tom As far as heating goes thats what I have done and it does work to an extent. I still have very low beam. Thats what amazes me most is the darn thing actually locks by itself. So increasing the temperature is worth a try. Regards Paul. On Mon, Sep 23, 2013 at 2:16 PM, Tom Knox act...@hotmail.com wrote: Thanks Corby for adding the link, I should have provided the link in my earlier post. The shipping concern is because Cesium or Caesium metal is highly reactive and very pyrophoric. In addition to igniting spontaneously in air, it reacts explosively with water even at low temperatures, but the small amount of actual Cesium in a Cesium standard as well as the hardening provided by that tube structure were important factors in it's exemption. I have recieved and shipped Cesium standards both in the USA and internaionally using the DOT exemption with no problem. I have a hard case designed specifically for that purpose which came with a Datum 4065C but is also perfect for the 5071A. It has all the critical warning and exemption information in metal labels riveted to the outside of the case. I have seen these cases on eBay from time to time. Be aware there is a limit of how many Cesium standard can be shipped at once under the exemption, I think it is five. Not really a factor for most of us. In any case I would use extreme caution if you ever open one for examination. To bad some industrious Time-Nut has not started a small business rebuilding Depleted Tubes. I have heard that failure often occurs when Cesium becomes mixed with contaminants and stuck to the enclosure walls, and there is a method to remove it. I know increasing the cell temp brings some standards back to life. And perhaps after heating and boiling the Cesium off he walls the cleaner tube can then be returned to factory settings? I am sure a number of you have far more expertise and have experimented with these ideas to determine whether there is any truth to these tall tails. If so I am sure I am not the only one that would enjoy hearing what you know, perhaps on a new thread. Thanks; Thomas Knox To: time-nuts@febo.com Date: Sun, 22 Sep 2013 23:57:43 -0700 From: cdel...@juno.com Subject: [time-nuts] HP5061B Beam Tubes Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] How much fluctuation does a typical Rb have?
Hi, So I've had my RFTG with a LPRO in it running for 2 weeks and it has made various corrections along the way: Time Elasped Change Type Change 09/09/2013 14:22:11 0 Power On 09/13/2013 14:55:40 347609 Freq -2.0524E-13 09/14/2013 15:00:30 434299 Freq -7.9048E-14 09/16/2013 15:10:08 607677 Freq -1.4628E-12 09/18/2013 15:19:45 781054 Freq 1.0041E-12 09/19/2013 15:24:34 867743 Freq -1.5560E-13 09/20/2013 15:29:23 954432 Freq -7.9048E-14 09/21/2013 15:34:12 1041121 Freq -3.2450E-13 09/23/2013 15:43:48 1214497 Freq -1.2866E-12 Is this pretty typical? I've had the unit temperature held pretty constant with a fan and a PID loop adjusting the speed to keep the temperature the same. Thanks, Alan ___ 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] HP5061B Beam Tubes
Tom I added 10 degrees and used the built in temp sensor in the tube as a gauge. So its sort of accurate to say 10 degrees. I remember evaluating the temp several ways. I did not return it to original temp as I believed at the time I was baking out the last few Cs. What your saying in the threads very interesting. But don't have time to go back and adjust or reconnect the old oven controller. I would have to look at all of that again to see whats needed. I did this about 2 years ago its in the time nuts archive I suspect. Regards Paul. On Mon, Sep 23, 2013 at 2:58 PM, Tom Knox act...@hotmail.com wrote: Hi Paul; I have heard that it is not so much loss of Cesium, but the Cesium and contaminate mix sticking to the enclosure walls. The increased heat boils some of the gunk off. My question is what if you REALLY heat up the tube for a fairly short period? How much have you increased temp? and have you tried returning to original setting once it has locked again? Thomas Knox Date: Mon, 23 Sep 2013 14:29:06 -0400 From: paulsw...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] HP5061B Beam Tubes Tom As far as heating goes thats what I have done and it does work to an extent. I still have very low beam. Thats what amazes me most is the darn thing actually locks by itself. So increasing the temperature is worth a try. Regards Paul. On Mon, Sep 23, 2013 at 2:16 PM, Tom Knox act...@hotmail.com wrote: Thanks Corby for adding the link, I should have provided the link in my earlier post. The shipping concern is because Cesium or Caesium metal is highly reactive and very pyrophoric. In addition to igniting spontaneously in air, it reacts explosively with water even at low temperatures, but the small amount of actual Cesium in a Cesium standard as well as the hardening provided by that tube structure were important factors in it's exemption. I have recieved and shipped Cesium standards both in the USA and internaionally using the DOT exemption with no problem. I have a hard case designed specifically for that purpose which came with a Datum 4065C but is also perfect for the 5071A. It has all the critical warning and exemption information in metal labels riveted to the outside of the case. I have seen these cases on eBay from time to time. Be aware there is a limit of how many Cesium standard can be shipped at once under the exemption, I think it is five. Not really a factor for most of us. In any case I would use extreme caution if you ever open one for examination. To bad some industrious Time-Nut has not started a small business rebuilding Depleted Tubes. I have heard that failure often occurs when Cesium becomes mixed with contaminants and stuck to the enclosure walls, and there is a method to remove it. I know increasing the cell temp brings some standards back to life. And perhaps after heating and boiling the Cesium off he walls the cleaner tube can then be returned to factory settings? I am sure a number of you have far more expertise and have experimented with these ideas to determine whether there is any truth to these tall tails. If so I am sure I am not the only one that would enjoy hearing what you know, perhaps on a new thread. Thanks; Thomas Knox To: time-nuts@febo.com Date: Sun, 22 Sep 2013 23:57:43 -0700 From: cdel...@juno.com Subject: [time-nuts] HP5061B Beam Tubes Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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
Re: [time-nuts] HP5061B Beam Tubes
I've always wanted to try baking the entire tube to vaporize any accumulations of Cs metal outside the internal oven. Is that what you did, Paul? If some of the free cesium metal near the detector can be recondensed at the oven end, or just redistributed uniformly throughout the tube, it might render a noisy tube usable again. The point at which cesium vaporizes is 250C / 482F, and that seems like it could be survivable unless there are thermoplastic structures or insulation sleeves inside the tube for some reason. The operation might be tricky, because while you wouldn't want to heat the tube sufficiently to vaporize all of the remaining cesium in the internal oven, you would also need to bake the tube for quite some time to heat its internal structures uniformly, since it's basically a vacuum bottle. Outgassing from various internal materials and structures would also be a concern. Something to try with a tube that is otherwise ready for the scrap heap... -- john, KE5FX Miles Design LLC -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts- boun...@febo.com] On Behalf Of paul swed Sent: Monday, September 23, 2013 12:52 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP5061B Beam Tubes Tom I added 10 degrees and used the built in temp sensor in the tube as a gauge. So its sort of accurate to say 10 degrees. I remember evaluating the temp several ways. I did not return it to original temp as I believed at the time I was baking out the last few Cs. What your saying in the threads very interesting. But don't have time to go back and adjust or reconnect the old oven controller. I would have to look at all of that again to see whats needed. I did this about 2 years ago its in the time nuts archive I suspect. Regards Paul. ___ 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] HP5061B Beam Tubes
Hi Tried that, didn't work. Works now. Bob On Sep 23, 2013, at 7:46 AM, Hal Murray hmur...@megapathdsl.net wrote: http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf That link does not lead to anything. Line wrap. You have to glue the pieces back together. -- These are my opinions. I hate spam. ___ 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] HP5061B Beam Tubes
Hi What the exemption allows you to do is to ship it at all via Fed Ex or UPS. If you read through it, the mandatory employee training and certification requirement is in the pdf. As soon as your local FedEx guy sees the big yellow stickers, things get complicated. Getting the 5071 shipped was a *major* hassle. Bob On Sep 23, 2013, at 2:16 PM, Tom Knox act...@hotmail.com wrote: Thanks Corby for adding the link, I should have provided the link in my earlier post. The shipping concern is because Cesium or Caesium metal is highly reactive and very pyrophoric. In addition to igniting spontaneously in air, it reacts explosively with water even at low temperatures, but the small amount of actual Cesium in a Cesium standard as well as the hardening provided by that tube structure were important factors in it's exemption. I have recieved and shipped Cesium standards both in the USA and internaionally using the DOT exemption with no problem. I have a hard case designed specifically for that purpose which came with a Datum 4065C but is also perfect for the 5071A. It has all the critical warning and exemption information in metal labels riveted to the outside of the case. I have seen these cases on eBay from time to time. Be aware there is a limit of how many Cesium standard can be shipped at once under the exemption, I think it is five. Not really a factor for most of us. In any case I would use extreme caution if you ever open one for examination. To bad some industrious Time-Nut has not started a small business rebuilding Depleted Tubes. I have heard that failure often occurs when Cesium becomes mixed with contaminants and stuck to the enclosure walls, and there is a method to remove it. I know increasing the cell temp brings some standards back to life. And perhaps after heating and boiling the Cesium off he walls the cleaner tube can then be returned to factory settings? I am sure a number of you have far more expertise and have experimented with these ideas to determine whether there is any truth to these tall tails. If so I am sure I am not the only one that would enjoy hearing what you know, perhaps on a new thread. Thanks; Thomas Knox To: time-nuts@febo.com Date: Sun, 22 Sep 2013 23:57:43 -0700 From: cdel...@juno.com Subject: [time-nuts] HP5061B Beam Tubes Per the following Symmetricom instructions, HP/Agilent/Symmetricom tubes or instruments with tubes are exempt from the Hazmat requirements if shipped within the USA. You still have to label them per the instructions and as stated you are considered trained If you understand the instructions. http://www.symmetricom.com/media/files/downloads/product-datasheets/shipp ing_instructions.pdf One other source for tubes for your 5060A/5061A/5061B (and 5062C with a bit more mods) is to use FTS tubes removed from FTS 4050 and 4060 units. Some minor mechanical mods and you have to make adaptor cables but they are simple to make. Corby ___ 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] HP5061B Beam Tubes
Twelve years ago I did disassemble a regular and a high performance tube, the only negative effect was I joined time nuts. The guts still decorate my window sill. The only parts inside that may be temperature sensitive are some copper wires with a clear coating. Every thing else is metal or ceramic. Bert Kehren In a message dated 9/23/2013 5:44:22 P.M. Eastern Daylight Time, j...@miles.io writes: I've always wanted to try baking the entire tube to vaporize any accumulations of Cs metal outside the internal oven. Is that what you did, Paul? If some of the free cesium metal near the detector can be recondensed at the oven end, or just redistributed uniformly throughout the tube, it might render a noisy tube usable again. The point at which cesium vaporizes is 250C / 482F, and that seems like it could be survivable unless there are thermoplastic structures or insulation sleeves inside the tube for some reason. The operation might be tricky, because while you wouldn't want to heat the tube sufficiently to vaporize all of the remaining cesium in the internal oven, you would also need to bake the tube for quite some time to heat its internal structures uniformly, since it's basically a vacuum bottle. Outgassing from various internal materials and structures would also be a concern. Something to try with a tube that is otherwise ready for the scrap heap... -- john, KE5FX Miles Design LLC -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts- boun...@febo.com] On Behalf Of paul swed Sent: Monday, September 23, 2013 12:52 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP5061B Beam Tubes Tom I added 10 degrees and used the built in temp sensor in the tube as a gauge. So its sort of accurate to say 10 degrees. I remember evaluating the temp several ways. I did not return it to original temp as I believed at the time I was baking out the last few Cs. What your saying in the threads very interesting. But don't have time to go back and adjust or reconnect the old oven controller. I would have to look at all of that again to see whats needed. I did this about 2 years ago its in the time nuts archive I suspect. Regards Paul. ___ 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] HP5061B Beam Tubes
As I mentioned I ran the oven 10 degrees hotter. To do that I needed to build a new oven controller. Thats was it. Regards Paul. On Mon, Sep 23, 2013 at 6:27 PM, ewkeh...@aol.com wrote: Twelve years ago I did disassemble a regular and a high performance tube, the only negative effect was I joined time nuts. The guts still decorate my window sill. The only parts inside that may be temperature sensitive are some copper wires with a clear coating. Every thing else is metal or ceramic. Bert Kehren In a message dated 9/23/2013 5:44:22 P.M. Eastern Daylight Time, j...@miles.io writes: I've always wanted to try baking the entire tube to vaporize any accumulations of Cs metal outside the internal oven. Is that what you did, Paul? If some of the free cesium metal near the detector can be recondensed at the oven end, or just redistributed uniformly throughout the tube, it might render a noisy tube usable again. The point at which cesium vaporizes is 250C / 482F, and that seems like it could be survivable unless there are thermoplastic structures or insulation sleeves inside the tube for some reason. The operation might be tricky, because while you wouldn't want to heat the tube sufficiently to vaporize all of the remaining cesium in the internal oven, you would also need to bake the tube for quite some time to heat its internal structures uniformly, since it's basically a vacuum bottle. Outgassing from various internal materials and structures would also be a concern. Something to try with a tube that is otherwise ready for the scrap heap... -- john, KE5FX Miles Design LLC -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts- boun...@febo.com] On Behalf Of paul swed Sent: Monday, September 23, 2013 12:52 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP5061B Beam Tubes Tom I added 10 degrees and used the built in temp sensor in the tube as a gauge. So its sort of accurate to say 10 degrees. I remember evaluating the temp several ways. I did not return it to original temp as I believed at the time I was baking out the last few Cs. What your saying in the threads very interesting. But don't have time to go back and adjust or reconnect the old oven controller. I would have to look at all of that again to see whats needed. I did this about 2 years ago its in the time nuts archive I suspect. Regards Paul. ___ 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] Fun employment for an EE/ time nut
Hello, I have been reading time nuts for quite a while and find it interesting and useful for my work. I manage the EE group at AOSense and would like to hire someone full-time with massive EE skills and some knowledge of time nuttery. AOSense is located in Sunnyvale California. About half our staff are scientists who work with cold atom technology. We have several projects currently running including a DARPA funded QUASAR Strontium based optical clock. Because this clock uses an optical transition, the fractional frequency stability is several orders of magnitude better than Rubidium. We would like to hire locally, but will relocate an outstanding engineer. Please review the job description and send your resume to me at jpe...@aosense.com if you have the outstanding skill set we need. Thank you, John Pease Director of EE AOSense Inc. jpe...@aosense.com JOB DESCRIPTION Position summary: We are seeking an electrical engineer to design and implement the control system for atom optic (AO) inertial sensors and clocks. The control hardware for AO sensors spans a broad range of technologies including low-noise analog, low-jitter digital, embedded systems, rf/microwave and high voltage. An ideal candidate will have an unusually broad background covering many of these diverse technologies. As a Senior Electronics Engineer at AOSense, you will work with scientists and engineers to define control system requirements and architectures, will design new circuitry, will oversee the fabrication and testing of AO sensor control hardware, and will support the completed hardware through the performance validation phase. Responsibilities: * Collaborate with physicists, instrument designers, and firmware engineers to specify sensor control requirements and make optimal trade-offs * Develop control architectures for sensors * Design new low-noise analog, digital and rf/microwave electronics * Iterate existing electronic designs to miniaturize and adapt them for highly-dynamic operating conditions * Document new systems and boards with block diagrams, schematics, bills of material, cable drawings, test procedures, and theory of operation descriptions * Conduct and participate in design reviews * Define and specify digital interfaces to FPGAs and microcontrollers * Collaborate with software engineers on the development of firmware * Contribute to proposals for further sensor development and applications Desired Skills Experience Requirements: * Demonstrated expertise in low-noise analog circuit development * Thorough understanding of noise processes in electronic systems * Extensive experience with standard diagnostic equipment, e.g. oscilloscopes, logic analyzers and spectrum analyzers * Experience supervising and reviewing complex PCB layouts * Ability to apply system level thinking to all phases of design * Excellent analytical and troubleshooting skills * Proficiency with EE CAD tools (e.g. Orcad, PADS PCB, LTSpice, Mathcad or Matlab) * Successful implementation of FPGA-based real-time measurement systems is highly desirable * Experience with laser drivers, low noise O/E conversion, PID control circuits, and DDS are desirable * Experience with the design of low phase noise RF sources and signal processing hardware is a plus * US Government contracts require applicants to be US citizens or permanent residents * Applicants should thrive in a dynamic start-up environment Education and experience: Master's degree or doctorate in electrical engineering with 10 y related experience, or equivalent professional experience. Company Description AOSense was founded in 2004 to develop innovative gravity and inertial sensors capitalizing on AO techniques. The test masses in our sensors are clouds of laser-cooled atoms freely falling in a vacuum cell. Frequency-stable lasers measure the motion of these atoms relative to the sensor platform. These two characteristics of AO sensors provide unparalleled accuracy and stability, far surpassing the performance of conventional sensors. ___ 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] HP5061B Beam Tubes
Hi Bert, Any chance of some high resolution photos ? BillWB6BNQ ewkeh...@aol.com wrote: Twelve years ago I did disassemble a regular and a high performance tube, the only negative effect was I joined time nuts. The guts still decorate my window sill. The only parts inside that may be temperature sensitive are some copper wires with a clear coating. Every thing else is metal or ceramic. Bert Kehren In a message dated 9/23/2013 5:44:22 P.M. Eastern Daylight Time, j...@miles.io writes: I've always wanted to try baking the entire tube to vaporize any accumulations of Cs metal outside the internal oven. Is that what you did, Paul? If some of the free cesium metal near the detector can be recondensed at the oven end, or just redistributed uniformly throughout the tube, it might render a noisy tube usable again. The point at which cesium vaporizes is 250C / 482F, and that seems like it could be survivable unless there are thermoplastic structures or insulation sleeves inside the tube for some reason. The operation might be tricky, because while you wouldn't want to heat the tube sufficiently to vaporize all of the remaining cesium in the internal oven, you would also need to bake the tube for quite some time to heat its internal structures uniformly, since it's basically a vacuum bottle. Outgassing from various internal materials and structures would also be a concern. Something to try with a tube that is otherwise ready for the scrap heap... -- john, KE5FX Miles Design LLC -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts- boun...@febo.com] On Behalf Of paul swed Sent: Monday, September 23, 2013 12:52 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP5061B Beam Tubes Tom I added 10 degrees and used the built in temp sensor in the tube as a gauge. So its sort of accurate to say 10 degrees. I remember evaluating the temp several ways. I did not return it to original temp as I believed at the time I was baking out the last few Cs. What your saying in the threads very interesting. But don't have time to go back and adjust or reconnect the old oven controller. I would have to look at all of that again to see whats needed. I did this about 2 years ago its in the time nuts archive I suspect. Regards Paul. ___ 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] Racal-Dana 199x DIY High Stability DIY Timebase
Found via Hack-a-day http://gerrysweeney.com/racal-dana-199x-diy-high-stability-diy-timebase-hack-for-under-25/ Chees -- Raj, VU2ZAP Bangalore, India. ___ 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.
