[time-nuts] BVA Oscillaotrs

[Mike Feher]

Said -

I bet you he meant exactly what you said, just had a mistake in the
representation of the exponent. Hope all is well with you. Was just at GD
all week. Regards - Mike 

Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Said Jackson
Sent: Friday, August 30, 2013 11:53 AM
To: Discussion of precise time and frequency measurement
Cc: <time-nuts at febo.com>
Subject: Re: [time-nuts] BVA Oscillaotrs

Steve,

10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better
than that. And they are specifically designed to give great ADEV from at
least 1s to 30s and more.

Agreed, its very easy to find fantastic phase noise performance from NEL,
Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big
deal these days, even though a very good Pascal ocxo will still cost as much
as four CSACs or more.

Please give some examples of oscillators that were designed specifically for
ADEV performance and can be ordered with specific ADEV parameters or are
known to have these kinds of performance levels typically, I don't know of
many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as
I have seen. Tom Van Back has a nice treatise on the ADEV of a large number
of 10811's he measured in his Z38xx gpsdos, only some are truly great.

Thanks,
Said

Sent From iPhone

On Aug 30, 2013, at 8:21, "Martyn Smith" <martyn at ptsyst.com> wrote:

> Hello,
> 
> Today many manufacturers are producing 10 MHz oscillators that offer 
> many advantages over BVA.
> 
> Phase noise of <  -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing 
> of 5 x
> 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is 
> available on a new product.
> 
> Also the short term Allan variance is in the low parts in 10E-13 for 
> one second.
> 
> It seems to me the only real advantage of BVA is the long term ageing 
> and this can easily be sorted out by locking to a superior standard.
> 
> Best Regards
> 
> Steve
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