Re: [time-nuts] Question about the PLL of Trimble Thunderbold

Hi Ferran, Here's another idea for your multi-OCXO synchronization project. Normally when we think about synchronized oscillators we imagine two of them in side-by-side or perhaps separated by a few meters of cable. Through some PLL magic they remain in perfect phase (and frequency), either

[time-nuts] Multi-oscillator synchronization (was: Question about the PLL of Trimble Thunderbold)

On Wed, 31 Oct 2018 14:45:06 -0700 "Tom Van Baak" wrote: > Question for the list -- who of you have done multi-oscillator PLL's? Can two > 10 MHz OCXO be locked to within 10 or 1 ps? For now, ignore cable issues and > > assume they're right next to each other. I've done that at the beginning

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

Re: [time-nuts] MEMS oscillators

Thanks that was a very cool presentation. Amazing that they made a sustainable commercial success out of something so wildly impractical. And the fact they made incremental improvements on the concept instead of giving it up for some different scheme is amazing. I got a sense that the

Re: [time-nuts] MEMS oscillators

On Thu, 1 Nov 2018 08:54:27 +1100, you wrote: >"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

Re: [time-nuts] Helium and MEMS oscillators don;t mix well

This reminds me of a Jack Kusters (of HP fame) anecdote. He left HP for a while to work for Ephratom on Rb standards. Some customer was raising hell about their Ephratom Rb standards having lousy accuracy. Jack had them send some of the "defective" units back to the factory, and the units were

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

Re: [time-nuts] Question about the PLL of Trimble Thunderbold

> I have in mind a project which consists in synchronizing two or more stable > clocks (OCXO) disciplined by GPS. > > However, would be great to have the option to disable the GPS on both sides > at a given time and to synchronize them in a Master-Slave or directly by means > of a protocol they

Re: [time-nuts] Helium and MEMS oscillators don;t mix well

I just came here to post that same link. Very interesting bit of hardware detective work. On Wed, Oct 31, 2018 at 12:51 PM Mark Sims wrote: > https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/ > ___ > time-nuts mailing list --

[time-nuts] Helium and MEMS oscillators don;t mix well

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Re: [time-nuts] Oscilloquartz 8600...

Hi, the BVA has a very small frequency calibration range. I have solved this analogous problem on two 1000B by replacing the fixed capacitor which determines the base frequency of the resonance inside the oscillator. I think it's the only way to solve the problem. There are no