[time-nuts] State of the art of crystal oscillator measurements

Mike Feher mfeher at eozinc.com
Thu Aug 11 12:01:54 UTC 2016


Ulrich -

 

This may be a naive question, but, how can you achieve results that are so
close to, and sometimes at further out are below kT? Thanks & 73 - Mike 

 

Mike B. Feher, EOZ Inc.

89 Arnold Blvd.

Howell, NJ, 07731

732-886-5960 office

908-902-3831 cell

 

From: KA2WEU at aol.com [mailto:KA2WEU at aol.com] 
Sent: Thursday, August 11, 2016 7:03 AM
To: time-nuts at febo.com; tvb at leapsecond.com
Cc: enrico.rubiola at gmail.com; mfeher at eozinc.com
Subject: Re: [time-nuts] State of the art of crystal oscillator measurements

 

Good morning,

 

the difference between the two phase noise FWSP systems is the lower noise
internal 10 MHz reference crystal  oscillator (optimized )  as well as also
some of the internal FSWP circuits custom  optimized . The output power was
17 dBm, but we also have build one oscillator with  12 dBm output power and
noise  similar values.

 

This is part of a PhD project which I supervise .   For values so close to
the carrier you need a very low noise power supply and a well shielded
Faraday cage . The measurement with ca 100  correlation took about 2 hours.
Also the heating circuit needs to be low noise and well decoupled .

 

The 100 Hz value of the better analyzer seems suspicious , It needs to be
further  investigated.

 

All very exciting and time consuming .

 

Ulrich 

 

 

 

 

 

In a message dated 8/10/2016 11:02:25 P.M. Eastern Daylight Time,
mfeher at eozinc.com writes:

These seem extremely fantastic results for a 100 MHz oscillator. I am
curious what the Po of the oscillators are 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 [mailto:time-nuts-bounces at febo.com] On Behalf Of Tom Van
Baak
Sent: Wednesday, August 10, 2016 9:19 PM
To: Discussion of precise time and frequency measurement
Cc: enrico.rubiola at gmail.com
Subject: Re: [time-nuts] State of the art of crystal oscillator measurements

Attached is a GIF of the table Ulrich wants to share.

Note time-nuts is a plain text mailing list so any rtf or html formatting is
discarded.
On the bright side, PDF or data or image attachments are allowed with no
problem.

/tvb

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