Brooklyn Dodgers here..... It has been caesium since I was an undergrad, at which time there were dinosaurs grazing in the quad.
On Friday, October 25, 2019, Richard Solomon <[email protected]> wrote: > When did the spelling of Cesium > change ? As far back as I can > remember (High School chemistry, > easier then, we only had 52 > elements), it was spelled Cesium. > > But then, they are still the San > Diego Chargers to me. > > 73, Dick, W1KSZ > > On Thu, Oct 24, 2019 at 11:00 PM Tom Knox <[email protected]> wrote: > > > The Latin form “caesium” is the internationally recognized legal > spelling. > > The common form “cesium” may still be found in older Symmetricom user’s > > manuals and publications. The caesium inside any of the devices is > > contained in a UN certified stainless steel cylinder. This cylinder meets > > all of the > > requirements for dangerous goods “containers” or “packages” for both > > international and U.S. domestic shipments. The instructions in this > document > > refer to the labeling required on the outside of the carton or box that > is > > used to enclose the caesium device. > > 1. All U.S. domestic (only) shipments must use and comply with all the > > requirements of the DOT-SP11401 exemption. The document may be > > downloaded from the DOT web site at > > http://hazmat.dot.gov/sp_app/special_permits/docs/11000/E11401.pdf. All > > Symmetricom customers who are > > reshipping the Symmetricom device do not need to be listed as a grantee > > and may use Symmetricom’s exemption (see Par. 8a of DOT-SP11401). > > The prohibited “modifications or changes” to the “package” referenced in > > Par. 8a refers to the stainless steel caesium beam tube cylinder, and not > > any > > other external packaging (see Par. 7a). Follow normal shipping and > > handling practice and the following instructions. > > 2. Attach a copy of DOT-SP11401 to the outer box or container. The > > document may be legibly reduced, folded, placed in a clear plastic pouch > and > > attached outside the package (see Par. 10). The title page should be > > readable through the pouch. Staple a copy of DOT-SP11401 to the shipping > > invoice so that the copy attached to the package will not be disturbed. > Do > > not include this instruction sheet that you are now reading. Do not use > > the preprinted, bar-coded dangerous goods label offered by the shipper, > > which, if scanned, would incorrectly route the package to non-passenger > > aircraft. > > 3. Mark the outside of the package "DOT-SP11401 CAESIUM UN 1407". A > > downloadable template is available from > > http://www.symmttm.com/5071A/Shipping. > > 4. Limit to five units the maximum number of caesium devices in each > > shipment (par. 7b). > > 5. Comply with the training requirement (Par. 11) for “Hazmat employee” > > under 49CFR 172.704(a)(2) function-specific training (i). Explanation: > > This requirement is fully met if the person handling the transportation > of > > the caesium device has read, understood and followed these > > instructions and DOT-SP11401. > > 6. Additional explanation: The following requirements of the IATA-DG > > regulations are waived by DOT-SP11401., i.e. not required for U.S. > > domestic only shipments. Paragraph numbers (Par. #) refer to the > > paragraphs in DOT-SP11401: > > LABELING “Dangerous When Wet” and “Danger – Do not load in passenger > > aircraft” are waived (Par. 4). > > PLACARDING “Dangerous When Wet” on the carrier’s vehicle is waived (Par. > > 4). > > AUTHORIZED PACKAGING or UN (United Nations) certified packaging is waived > > (Par. 4). The stainless steel caesium beam tube cylinder > > comprises the authorized or prescribed packaging. No other packaging over > > the apparatus is required for compliance (Par. 4 and 7a). > > PASSENGER AIRCRAFT is added as an authorized mode of shipment (Par. 9). > > Note: FedEx recognizes DOT exemptions. Some carriers, > > such as UPS and DHL may not recognize DOT exemptions. Check first with > the > > carrier when using the exemption. > > International Shipping > > 1. All overseas and international shipments must comply with the > > requirements of the UN/IATA dangerous goods regulations. Visit > > http://www.iata.org/cargo/dg/index.htm. > > 2. Mark the outside of the package: “Inner packages comply with > prescribed > > specifications CAESIUM UN1407 0.009kg”, the UN package > > certification number, the “Dangerous when wet” and “Do not load in > > passenger aircraft” stickers. A downloadable template is available from > the > > Symmetricom web sites noted above. Any suitable container that is > > reasonably strong for normal shipping and handling may be used. No other > UN > > certified container is required by the regulation. Visit the Symmetricom > > web sites for more information. > > 3. Attach a Dangerous Goods Declaration (authorized, red-stripe bordered > > document) and fill identification as follows: Proper name CAESIUM; > > Class 4.3; UN No. UN1407; Packing group I; Quantity and type of packing: > 1 > > Steel Container, 1A1 0.009 kg Overpack Used; Packing inst. 412. > > Cross out the words: “Passenger Aircraft” and “Radioactive”. Fill all > > relevant fields such as Shipper and Consignee appropriately. > > > > > > Tom Knox > > > > 303-554-0307 > > > > [email protected] > > > > "Peace is not the absence of violence, but the presence of Justice" Both > > MLK and Albert Einstein > > > > ________________________________ > > From: time-nuts <[email protected]> on behalf of Bob > kb8tq > > <[email protected]> > > Sent: Thursday, October 24, 2019 7:06 PM > > To: Discussion of precise time and frequency measurement < > > [email protected]> > > Subject: Re: [time-nuts] HP5071A with bad tube.... can I get one used? > > > > Hi > > > > Well, I started shipping them back to the factory in the 1990’s and did > so > > a number > > of times since then. If there was an exemption, the factory was not aware > > of it. They > > were the driver for being sure it was shipped as hazmat. Each time > > (knowing what > > the issues would be), I offered to drive the unit up there and drop it > > off. That never > > seemed to be an acceptable process. > > > > Bob > > > > > On Oct 24, 2019, at 5:14 PM, Tom Knox <[email protected]> wrote: > > > > > > Actually, unless it has changed in recent years the 5071A has a DOT > > shipping exemption. > > > Sadly last I checked several years ago the standard tube was over $28K. > > Years ago there was a gentlemen in Colo Spring actually repairing tube > but > > I believe he passed away a few years ago. > > > My guess is the main hurdle repairing these is the precision machining > > and welding required to cut these in half and weld them back together. > > > Cheers; > > > > > > Tom Knox > > > > > > 303-554-0307 > > > > > > [email protected] > > > > > > "Peace is not the absence of violence, but the presence of Justice" > Both > > MLK and Albert Einstein > > > > > > ________________________________ > > > From: time-nuts <[email protected]> on behalf of Bob > > kb8tq <[email protected]> > > > Sent: Thursday, October 24, 2019 12:23 PM > > > To: Taka Kamiya <[email protected]>; Discussion of precise time and > > frequency measurement <[email protected]> > > > Subject: Re: [time-nuts] HP5071A with bad tube.... can I get one used? > > > > > > Hi > > > > > > Based on running a high performance tube version of the 5071A for a > > number of years, the > > > tubes last about 5 to 7 years when run 24/7/365. Once they die, the > > practical ($$$$$$$) > > > alternative is to send the beast back to the factory for a new tube. > > Indeed given the price > > > and the complexity of shipping (it’s a hazmat item), this is only > > practical if you are a company > > > that needs to use the device. > > > > > > At least on the high performance 5071, the “end of life” process is not > > an immediate death sort of > > > thing. The stability (ADEV) of the device degrades as the tube wears > > out. If you have a stability > > > requirement (not just function) the wear out point will be a bit > earlier > > than the numbers above. > > > Just how much earlier depends a bit on how picky you are. ( = if you > > high performance tube is > > > worse than a standard tube, how happy are you?) You also would need the > > gear to test the ADEV. > > > > > > Some of what’s in the 5071A is running based on firmware and settings > > shot in here and there > > > on the device. Updating / adjusting / tweaking those settings has not > > been documented out > > > here “in the wild” AFIK. The factory (obviously) does understand how to > > tweak this or that. > > > The degree to which tweaks might be needed with this or that unusual > > tube is very much > > > open to debate. > > > > > > The whole “can’t get a tube” issue is hardly unique to the 5071A. I > have > > a pair of Cs standards > > > in the basement. Both have tube issues. One may be repairable if I ever > > get around to playing > > > with the fix. Once “fixed” will it run for another few months or a few > > more years? There is no way > > > to know without trying it. > > > > > > Will this or that tube last a month, a year or two or a decade or thee? > > I know of no external test that will > > > guarantee a decade of capacity. There are indeed tests that will > suggest > > that you are limping along. > > > Most (but not all) basement Cs standards are in the “limping along” > > category. As with the 5071, > > > just what constitutes limping along, depends a bit on how close to (or > > how much better than) the > > > factory spec you need to be. > > > > > > Bob > > > > > >> On Oct 23, 2019, at 11:42 PM, Taka Kamiya via time-nuts < > > [email protected]> wrote: > > >> > > >> I have an HP5071A with a high performance option that does not work. > > All of my tests indicate the faulty component is a tube itself. Buying a > > new tube is way out of my budget. I am now torn between parting it out > and > > see what I can use and keeping it intact with hope something might pop > up. > > >> > > >> Question for the group.... Obtaining a used tube for this, I don't > > care if its high performance or not, as long as it works with the > chassis, > > is really not a possibility, correct? I have never seen one on eBay. > > >> > > >> --------------------------------------- > > >> (Mr.) Taka Kamiya > > >> KB4EMF / ex JF2DKG > > >> _______________________________________________ > > >> time-nuts mailing list -- [email protected] > > >> To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> and follow the instructions there. > > > > > > > > > _______________________________________________ > > > time-nuts mailing list -- [email protected] > > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > _______________________________________________ > > > time-nuts mailing list -- [email protected] > > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to http://lists.febo.com/mailman/ > listinfo/time-nuts_lists.febo.com > and follow the instructions there. > -- Homo sum humani a me nihil alienum puto. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
