[time-nuts] State of the art of crystal oscillator measurements
Mike Feher
mfeher at eozinc.com
Thu Aug 11 08:01:54 EDT 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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