[time-nuts] OCXO sensitive to gravitational effects

2009-09-03 Thread Peter Putnam
You have all been a bit stingy with your gravitational inputs on the hp 18011 oscillator... one G this way... two Gs the other way... Here you can see the result of some serious Gs, all applied at the same time... e*.* auction item:160360186935 Add only $56.55 to your bid to s

[time-nuts] OCXO sensitive to gravitational effects

2009-09-04 Thread Mark Sims
You should have seen the Tek CG5011 cal generator that I got from him (bought it for the optical encoder to repair another one). Half the ceramic ECL chips were decapitated... it's only a flesh wound... cleanup on 6, bring a scooper. __

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-08-14 Thread John Green
Interesting. It makes sense that it is the holder and not the crystal itself that is sensitive. I only implied that the oscillator as a whole displayed this sensitivity. While I didn't try to actually measure the change, I would estimate it at almost 1e-8. I will try to use a strong magnet nearby t

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-08-14 Thread Lux, Jim (337C)
Or, as it was explained to me, the magnetic field causes the holder to move, which puts a mechanical stress on the crystal, which changes the frequency. And an AC field can induce a voltage in a loop (i.e. The wires going to the crystal), which then moves the crystal, etc. Limitless things to w

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-08-14 Thread Magnus Danielson
Lux, Jim (337C) wrote: Or, as it was explained to me, the magnetic field causes the holder to move, which puts a mechanical stress on the crystal, which changes the frequency. Just how much depends on the details not only on the holder parts but also how the crystal is mounted. The extreme c

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-09-03 Thread phil
- Original Message - From: "Peter Putnam" To: "Time Nuts" Sent: Friday, September 04, 2009 1:30 AM Subject: [time-nuts] OCXO sensitive to gravitational effects You have all been a bit stingy with your gravitational inputs on the hp 18011 oscillator... one

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-09-04 Thread Ed Palmer
Peter Putnam wrote: You have all been a bit stingy with your gravitational inputs on the hp 18011 oscillator... one G this way... two Gs the other way... Here you can see the result of some serious Gs, all applied at the same time... e*.* auction item:160360186935 Add only $

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-09-04 Thread Dave Baxter
Nah... That'll polish out OK!... Dave G0WBX. -- Message: 4 Date: Fri, 04 Sep 2009 02:13:27 -0600 From: Ed Palmer Subject: Re: [time-nuts] OCXO sensitive to gravitational effects To: Discussion of precise time and frequency measurement Messa

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-09-04 Thread Lux, Jim (337C)
More realistically, it's not that hard to simulate 2 G 9.8 = V^2/r or (2*pi)^2*r*rotation rate^2. Say you have an r of one meter (should fit conveniently in your garage)... 10/12 /1 = rotation rate^2... About 1 rev/second -> 60 rpm. 12 m/s tangential velocity. That would actually get you

Re: [time-nuts] OCXO sensitive to gravitational effects

2009-09-04 Thread Bill Hawkins
time and frequency measurement Subject: Re: [time-nuts] OCXO sensitive to gravitational effects Peter Putnam wrote: >You have all been a bit stingy with your gravitational inputs on the hp >18011 oscillator... one G this way... two Gs the other way... >Here you can see the