Re: [time-nuts] Cs tube pics

> Thanks for the other good links as well. Your pictures at HP are archived > in Google somewhere, as I ran across at least one in my preliminary > research. Hi Skip, Ah, now I know what you mean. Around 2005 I took a set of cesium beam tube photos within the semi-public viewing area at

[time-nuts] Cs tube pics

Hello Nuts, Yes, I originally had the wrong dash in the link names and did fix it almost immediately. That is why they now work. (Should have put pictures with both names in the folder so they would have worked for all) Tom, really like your third link that has the cover over the microwave

[time-nuts] Characterizing GPS radio occultation loss of lock due to ionospheric weather

< http://onlinelibrary.wiley.com/doi/10.1002/2015SW001340/full > from Space Weather, an AGU journal ___ 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

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

All of those places are pretty much gone. The last place locally in Milford Ma fell apart literally after the person that knew anything passed away. The last thing they were rebuilding and could make money at were tubes for fighter air craft sold as surplus. I was lucky to see the place and parts

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

Skip I added the pix to your fine commentary. Plus Toms pix. But its now a 3MB file. Yes above the oven is the first state selector magnet. Never ever thought I would see this clarity and level of detail. Not sure there is any way to see the photo multiplier. I believe that would be a set of

[time-nuts] So what’s inside that Cs Beam Tube anyway?

Rebuilding TV CRTs used to be quite common. Slice neck off tube, "re-gun", melt neck back on, suck out air, profit!. A few years back I found a place that would re-gun (or attempt to) the CRT from an HP9100A calculator. > The only "rebuildable" (vacuum) tubes

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

On 10/31/16 3:28 PM, Richard (Rick) Karlquist wrote: The ghost of Jack Kusters is now spinning in his grave on this Halloween night. Jack was a fairly opinionated guy and it didn't take much to get him excited. Jack used to rail against people who asked this naive question. There are any

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

More eye candy for the cesium nuts -- the center of a cesium beam tube is the large copper Ramsey microwave cavity. Each generation of cesium standard uses a different design. The 5 specimens seen here came from Corby Dawson, who's probably hacked open more Cs tubes than all of us put together.

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

The ghost of Jack Kusters is now spinning in his grave on this Halloween night. Jack was a fairly opinionated guy and it didn't take much to get him excited. Jack used to rail against people who asked this naive question. There are any number of reasons why this doesn't make sense. One major

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

Skip, Really great pictures that have lots of clean detail. Thanks for sharing with us. I can see that many of the wires would be a challenge to deal with. But I will guess the ionizer was the issue on this tube also. Thanks for sharing. Regards Paul WB8TSL On Mon, Oct 31, 2016 at 5:56 PM, Tom

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

In message <67092a4fd8045729d0aa463bd288f...@blackfoot.net>, djl writes: >Echo, Magnus. Thanks, Skip! Easy now to see the incredible expense of >building one of these! Kinda Kludgy; Love the s/s spot welded keepers on >the screw heads, e.g. I don't think they're keepers. I think

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

Wow. Nice job of dissection, and good pictures - very informative. No wonder those things are so expensive. It's a shame that they're not built in such a way that just the wear-out parts could be replaced, and not wasting all the rest of the design and craftsmanship that's probably just fine.

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

Echo, Magnus. Thanks, Skip! Easy now to see the incredible expense of building one of these! Kinda Kludgy; Love the s/s spot welded keepers on the screw heads, e.g. My really dumb question is, why isn't there Cs plated on everything? Or is the Cs contained in the rf cavity only? I think I see

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

> To enjoy the links, replace CS-tube with CS_tube in the links. Worked for me without the edit and didn't work with that change. (Skip may have fixed the web site names? Or maybe there is something interesting going on.) -- These are my opinions. I hate spam.

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

There's a sectioned Cs tube at the science museum in London, sadly I can't see the pics you link to but I'd be interested to see if they're the same as that exhibit (I think I have a picture somewhere) On 31 Oct 2016 20:54, "Skip Withrow" wrote: > Hello Time-Nuts, > > >

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

Hi Skip, Many thanks for taking the effort and describing what we see. Good thing to tinker around with, if you have one. Good conversation piece. :) Cheers, Magnus On 10/31/2016 09:54 PM, Skip Withrow wrote: Hello Time-Nuts, I recently acquired a stock of dead cesium beam tubes, and my

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

Hi, To enjoy the links, replace CS-tube with CS_tube in the links. Cheers, Magnus On 10/31/2016 09:54 PM, Skip Withrow wrote: Hello Time-Nuts, I recently acquired a stock of dead cesium beam tubes, and my curiosity got the best of me, so I have cut one open. After watching lots of YouTube

[time-nuts] So what’s inside that Cs Beam Tube anyway?

Hello Time-Nuts, I recently acquired a stock of dead cesium beam tubes, and my curiosity got the best of me, so I have cut one open. After watching lots of YouTube video of burning and exploding cesium I was a little leery at first. The first step was to make a very small hole just to let a

Re: [time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

Hi …. or you could do a milled box inside a milled box inside a milled box. Isolate each one from the others. Filter all leads at each “goes in” and each “goes out”. Put the input side in it’s own cavity in each box. Put the output side in it’s own cavity. Put the control signals in their own

Re: [time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

I should mention that the input supply filtering to the DC-DC converter should have good attenuation at the switching frequency, but not at low frequencies, so there's no need to get carried away with the size of the filtering at the converter input. Too much filtering, especially inductance,

Re: [time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

Yes, for best quietness, you definitely should "can it up" in a metal box, and use feed-through caps for all the I/O, including the commons or grounds. You have to figure out also where all the currents flow, and contain the loops. With sufficient L-C filtering on the input and output (all

[time-nuts] Changing COM Port

Thanks! I should have typed “Program Files” not “Program Filed.” Adding the /3 after the right hand quote in the shortcut worked fine. I found, however, that entering /3 as a command once the program is running does not seem to work. I did not try configuring the heather.cfg file since it

Re: [time-nuts] Temp/Humidity control systems?

On 31 October 2016 at 10:37, Poul-Henning Kamp wrote: > > In message gmail.com>, "Dr. David K > irkby (Kirkby Microwave Ltd)" writes: > > >> > [...] so it might be a relatively cheap way to measure

Re: [time-nuts] Temp/Humidity control systems?

Hi A multi mode resonant cavity is probably the “easy” approach. Like the waveguide, it is pressure / temperature / humidity sensitive. The same “can I separate the effects” issue applies. Any enclosed device will have issues with properly representing the humidity in the room. It’s

Re: [time-nuts] Temp/Humidity control systems?

In message , "Dr. David K irkby (Kirkby Microwave Ltd)" writes: >> > [...] so it might be a relatively cheap way to measure humidity. >> >> 80m wave-guide is neither cheap, nor in most circumstances, practical :-) >

Re: [time-nuts] Temp/Humidity control systems?

On 31 Oct 2016 06:07, "Poul-Henning Kamp" wrote: > > > In message < canx10hcpa5sozukqe00c5hcm-zrwkblnsojcoljokdriols...@mail.gmail.com>, "Dr. David K > irkby (Kirkby Microwave Ltd)" writes: > > > [...] so it might be a relatively cheap way to measure humidity. > >

Re: [time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

On 10/30/16 22:17, Poul-Henning Kamp wrote: > > In message , Christopher > Brown writes: > >> Could not find anything with really good specs so am currently thinking >> something like a Traco TDN 3-1213WI (200ma 15V) feeding a filter

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Seller probably meant TSIP. This probably means he is using the end connector on the board and populating the RS232 connectors on the front of the unit with the various USART outputs that are available on the end connector. I note one of the RS232 connectors has a pin identified as 1pps and

Re: [time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

In message , Christopher Brown writes: >Could not find anything with really good specs so am currently thinking >something like a Traco TDN 3-1213WI (200ma 15V) feeding a filter into a >low noise linear reg to -10VDC followed by another

Re: [time-nuts] Temp/Humidity control systems?

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Re: [time-nuts] Temp/Humidity control systems?

In message , "Dr. David K irkby (Kirkby Microwave Ltd)" writes: > [...] so it might be a relatively cheap way to measure humidity. 80m wave-guide is neither cheap, nor in most circumstances, practical :-) --