Re: [time-nuts] MEMS oscillators
What a hoot! I was an engineer for a company in the early 1970's (1972, 73, I think) where we used an Eidophor projector for a large arena crowd projecting the Indie 500 on a huge screen The arena held about 10,000. The technology didn't last for more than a few years as I recall. Dave W6TE -Original Message- From: time-nuts On Behalf Of Julien Goodwin Sent: Wednesday, October 31, 2018 2:54 PM To: Discussion of precise time and frequency measurement ; Joe Leikhim Subject: Re: [time-nuts] MEMS oscillators Reminds me a little of the crazy Eidophor projectors. "An Eidophor was a television projector used to create theater-sized images. The name Eidophor is derived from the Greek word-roots ‘eido’ and ‘phor’ meaning 'image' and 'bearer' (carrier). Its basic technology was the use of electrostatic charges to deform an oil surface." https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D3-BvMcqEc98data=02%7C01%7C%7Cd720898b578648fbd62b08d63f7b9f89%7C84df9e7fe9f640afb435%7C1%7C0%7C636766197521921210sdata=L4V5rmgatXykrhBV%2BLDABHzUmsb%2FOPZfb4WkebsejcE%3Dreserved=0 https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FEidophordata=02%7C01%7C%7Cd720898b578648fbd62b08d63f7b9f89%7C84df9e7fe9f640afb435%7C1%7C0%7C636766197521921210sdata=qn66ZlL8EjI%2FpeRD3qxxzt8qPN5vUEaqTtL4tL%2B6yZA%3Dreserved=0 On 31/10/18 04:39, Joe Leikhim wrote: > This is fascinating. I am a bit skeptical if this actually happened. > > I had an opportunity to meet an engineer that was involved with early > HDTV development. Apparently early in his career he invented a color > projection CRT for cinema. It had some sort of target inside of it (I > think plastic) that was subjected to the electron beam but would > outgas hydrogen in significant amounts and that hydrogen would ionize > in the electron beam which was undesired. So they incorporated a band > of titanium around the neck of the tube and the titanium apparently > allows hydrogen to collect and migrate through it even though there is > a vacuum inside the tube. It worked as intended. Then the Chinese > tried to replicate the design and did not use a titanium band because > they had no idea it had a purpose. Their tubes failed miserably. > > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.comdata=02%7C01%7C%7Cd720898b578648fbd62b08d63f7b9f89%7C84df9e7fe9f640afb435%7C1%7C0%7C636766197521921210sdata=00KmpGFpfFuO4KVZFAFNdD9QmT72Af3SRRortrPe3rk%3Dreserved=0 and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Oscillators
Hi Bob, I'll be on vacation for the next two weeks and out of internet range part of the time. Please consider my earlier request at the appropriate time. Best regards, Dave Smith -Original Message- From: time-nuts On Behalf Of Bob Martin Sent: Wednesday, October 3, 2018 1:48 PM To: Time Nuta Subject: [time-nuts] Oscillators Time-Nuts, I'm already getting requests from people who can't read! Please don't contact me until everyone has a chance to process the list of oscillators. Cheers Bob ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.comdata=02%7C01%7C%7C2b8c48de1be243a75f1c08d62971b4aa%7C84df9e7fe9f640afb435%7C1%7C0%7C636741965662369715sdata=GxI5qOYqKWNtl8UMIvIIka2DToZKyJT6YEjXjTQb6Eg%3Dreserved=0 and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Oscillators away
Hi Bob, Thanks for making these available to group members. I could make use of either of your Rb, 10 MHz., osc's (17 or 18). I am in need of a high stab osc for my Amateur Radio microwave rover station. These stabilize the Tx/Rx frequencies in the transverters. Best regards, Dave Smith W6TE -Original Message- From: time-nuts On Behalf Of Bob Martin Sent: Wednesday, October 3, 2018 1:30 PM To: Time Nuta Subject: [time-nuts] Oscillators away Time-Nuts, I have a number of oscillators to give away. The link to images, along with a few datasheets is below: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fapp.box.com%2Fs%2Fhq22jbe3jdfzhfqnot1hxcvjqwdooj6mdata=02%7C01%7C%7Cf13503bc38694d036d9608d6296f220c%7C84df9e7fe9f640afb435%7C1%7C0%7C636741954614227721sdata=6EedT8y4j28OaqaLkJG3RIelonoml90SOhGXfRN4uC0%3Dreserved=0 Note that there are two pages in the Box.com folder. I'm willing to part with them, one or two to a customer, in return for the cost of shipping. For myself, I'd prefer they to go to those who will use them. So, if you want one, please tell me how you plan to incorporate it into your timing system. If you have questions about individual oscillators please send then to the group because the answers can then be shared. The moderator can decide whether this is a viable process. Other than the moderator, please DO NOT not contact me directly for now. In a week or so I'll send a message to the group to begin the request process. This should allow everyone time to consider their needs and possibilities. Some of the devices are valuable and I may share your requests with the group or individuals in the group as a sanity check for your request. Again, please don't contact me directly until everyone has a chance to review the list and I send the post to begin. The selection process will be off-list. Thanks, Bob Martin Oscillator List Osc 1 Efratom EMXO Series Sub-Miniature Military Quartz Crystal Oscillator Old Unit 10MHz sine out - data sheet in Box link Osc2 Efratom EMXO Series Sub-Miniature Military Quartz Crystal Oscillator Old Unit 10.23MHz sine out - data sheet in Box link. Osc3 OCXO Morion MV200 10MHz sine OSC4 OCXO Symmetricom STP2640 LF 10MHz sine Osc5 OCXO Unknown CQE 0140/0020 DOC3098 10MHz sine Size like Milliren 250 series Osc6 OCXO Morion MV200 10MHz sine Attached to mixer based locking circuitry Designed to lock to external reference. If you want it, you will need to show how you plan to use it appropriately. Osc7 OXCO Morion MV83M 5.0MHz sine Mounted in box with regulator and SMA output Osc8 OXCO MTI Milliren 250-0700-B 5.0MHz sine Mounted in cast Bud box with iso-amp to raise output level. Osc9 OXCO MTI Milliren 240-0536-C 16.0MHz square Osc10 OXCO MTI Milliren 240-0551-C 16.0MHz square Osc11 OCXO MTI Milliren 220-0199 32MHz square quant = 4 Output of board is 16MHz square wave 3V into 50 ohms. "Lockoscillator" boards designed to lock automatically to 5 or 10MHz reference. Locking is mixer/integrator based. Used in 5MHz steered DDS's. If you want one you will need to have be explicit regarding your application. Osc 12 OXCO MTI Milliren 220-0199 32.0MHz square quant. = 4 Osc13 OXCO MTI-Milliren 220-0199 32MHz doubled to 64.0MHz Mounted in box with mixer doubler, filters and sine to square wave converter. Osc14 OXCO MTI Milliren 220-0224 77.76MHz square Osc15 VCXO Vectron 155.52MHz PECL out Osc16 TCXO Vectron TC-210-DFC-S5711 100MHz PECL out Data sheet in Box link. Osc17 Symmetricom SA.35m Rubidium 10MHz sine Verified sine out Osc18 Stanford Research PRS10B Rubidium 10MHz sine Verified sine out and PPS Some items were dumpster dived including Osc4, Osc17 and Osc18. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.comdata=02%7C01%7C%7Cf13503bc38694d036d9608d6296f220c%7C84df9e7fe9f640afb435%7C1%7C0%7C636741954614227721sdata=i5WNN%2Ftohc2PdUo6TZTqsKlmiD6cx%2B5m2OXaUpZspeQ%3Dreserved=0 and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] History Channel "In Search of" Time Travel
You're a movee star! -Original Message- From: time-nuts On Behalf Of Tom Van Baak Sent: Friday, August 17, 2018 2:08 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] History Channel "In Search of" Time Travel Check out History Channel tonight (Friday, August 17) for a new series called "In Search Of" hosted by Zachary Quinto. Episode 5 is titled "Time Travel". There's a chance this episode will include some bits with my car & cesium clocks. Earlier this year I was invited by the producers to perform a gravitational time dilation experiment like the ones I did in 2016 for a Stephen Hawking TV show and the family clock trip up Mt Rainier in 2005. This time I selected Mt Palomar, CA which is conveniently located in the greater LA area. You likely know of Palomar because of the famous 200 inch Hale telescope up at the ~5500 foot summit. Our base was a beachfront hotel in Seaside, CA. The elevation difference was about 1.6 km and the clocks were separated for about 24 hr so 15 ns of time dilation is expected. Over two days they certainly took lots of footage of the clocks, the car, and some conversations with me. I have no idea how many seconds of actual screen time that might result in. None of it was scripted or rehearsed so I hope I didn't do or say anything too stupid on camera. I'll have more info by tomorrow and update the web page: https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fleapsecond.com%2Fgreat2018a%2Fdata=02%7C01%7C%7Cfaec212930eb447b837c08d60485abd9%7C84df9e7fe9f640afb435%7C1%7C0%7C636701369486005780sdata=txsMDLuqT6Lu32dth8ArZZRuskRvA98VNmmK3TB42Jk%3Dreserved=0 /tvb ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.comdata=02%7C01%7C%7Cfaec212930eb447b837c08d60485abd9%7C84df9e7fe9f640afb435%7C1%7C0%7C636701369486005780sdata=sAQ3hyLWTOUxGUkanK%2BfXoiHz1OC3dXfeJ1bb4sgG%2Bk%3Dreserved=0 and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
