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Old 10th December 2012, 06:56 PM   #31301
gerhard is offline gerhard  Germany
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Quote:
Originally Posted by simon7000 View Post
I'll let you know the difference in a few weeks. I am building a few. As the temperature control is a separate unit I can do some of each.
I have that folly already behind me. Built a Peltier unit to cool wafers for
characterization and decided to test one of my better oscillators on it.

A E5052B signal source analyzer or a hp53310A modulation domain analyzer
are cruel eye openers.

Gerhard
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Old 10th December 2012, 07:01 PM   #31302
PHEONIX is offline PHEONIX  Australia
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Hello Simon,

Are you using the rubidium clock because of its phase noise performance.

Arthur
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Old 10th December 2012, 07:26 PM   #31303
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Quote:
Originally Posted by gerhard View Post
I have that folly already behind me. Built a Peltier unit to cool wafers for
characterization and decided to test one of my better oscillators on it.

A E5052B signal source analyzer or a hp53310A modulation domain analyzer
are cruel eye openers.

Gerhard
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Old 10th December 2012, 07:30 PM   #31304
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Hello Simon,

Are you using the rubidium clock because of its phase noise performance.

Arthur
For audio and video production very accurate time coding is quite useful. That requires long term accuracy. For audio it is the jitter. Currently I am below 1 ns according to the limited instrumentation I have.

Yes the other issue is the WOW factor. I once had someone design an arena system and specify a $300 mixer. Yes it would have worked, but folks looking in the window at the control room would not have been impressed.
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Old 10th December 2012, 07:37 PM   #31305
PHEONIX is offline PHEONIX  Australia
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You know the lowest phase noise is achieved with quartz and they are the gold standard for phase noise performance.
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Old 10th December 2012, 08:03 PM   #31306
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Yes the other issue is the WOW factor.
May-be the most important. Unless you have succeeded to make your place a reputation of "magic room".
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Last edited by Esperado; 10th December 2012 at 08:13 PM.
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Old 10th December 2012, 08:04 PM   #31307
1audio is offline 1audio  United States
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Originally Posted by PHEONIX View Post
You know the lowest phase noise is achieved with quartz and they are the gold standard for phase noise performance.
And they come in qualities ranging from Platinum to lead. . . Like audio a lot of the performance comes from design and execution. The components aren't too expensive, but getting the performance is a lot of work and experience.
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Old 10th December 2012, 08:29 PM   #31308
1audio is offline 1audio  United States
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Quote:
Originally Posted by simon7000 View Post
For audio and video production very accurate time coding is quite useful. That requires long term accuracy. For audio it is the jitter. Currently I am below 1 ns according to the limited instrumentation I have.

Yes the other issue is the WOW factor. I once had someone design an arena system and specify a $300 mixer. Yes it would have worked, but folks looking in the window at the control room would not have been impressed.
For bling the SRS box is a good start. I would look closely at this alternative if a GPS antenna can be managed: Model 1083B GPS Satellite-Controlled Frequency Standard - Precision Time Clock Series It has a 10 MHz Wenzel oscillator disciplined by GPS with a neat display on the front. You can also use it for time and timing probably to well less than 1 uS absolute (for time code sync.). Get the battery backup version.

I would transformer isolate the incoming clock just to reduce the noise coupling between the chassis.

Measuring jitter in a system becomes a complex issue but the most straightforward way is in the final output since the DAC will either hide or accentuate the jitter components and its really what matters. Its easier to measure at the output that looking at the internal stages.
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Old 10th December 2012, 08:54 PM   #31309
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Nah, not enough bling...

Now you mention the transformer, after I have finished the layout! Fortunately it hasn't gone out yet...

Jitter is worse in recording than play back. As long as I get it to where I can't measure it, that will have to do. Listening tests in a stadium are a bit limited by noise!
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Old 10th December 2012, 09:33 PM   #31310
RNMarsh is offline RNMarsh  United States
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Internet was down so i thought I'd come outside today. I had tried to login on my tablet, turns out its an Etch-N-Sketch and I dont even own a tablet. Also, I'm out of Vodka. -RNM
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