Bob
Don't know if I can explain it to you, I'm not so good at explaining,
I'll give it *ONE* try.
Example with some random picked numbers (JUST TO SHOW THE MAIN POINTS).
I tried,
All information and test that are available on the TPLL is on JOHN'S KE5FX
site or in past postings.
On 06/19/2010 12:49 AM, WarrenS wrote:
Say you have a nice logic gate with 1 ns delay
If you make it all nice and clean, and repeatable such as constant PS,
rise time etc.
Then one can get repeatable results say 100 times better from cycle to
cycle in the short term.
so down to 10ps repeatable.
Hi
Since ADEV is a measurement of noise, you want to be very careful about just
which noise you keep and which noise you throw away.
Bob
On Jun 19, 2010, at 7:06 AM, Magnus Danielson wrote:
On 06/19/2010 12:49 AM, WarrenS wrote:
Say you have a nice logic gate with 1 ns delay
If you make
Warren,
I was responding to ke5fx comment using a 12-bit, 480-Hz serial DAQ in
place of the voltage-to-frequency converter in the diagram above. A DAQ
is a multifaceted data acquisition system, where as in your annotated
diagram you showed an ADC.
I understand it's analog, but you said: Say
Thank You John, It is working Great. Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: John Miles jmi...@pop.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu, June 17, 2010 5:38:16 PM
Subject: Re: [time-nuts] how sad ):
On
Magnus posted:
The square root improvement assumes white noise
A logical gate or any other amplifier will also have flicker noise,
To analyze it, Allan variance and friends needs to be applied.
No disagreements
What some may be missing is that this side tracked discussion and has little
at
Bob
I tried, (more than once), and now we are heading way off subject.
I should of known better and learned by my past mistakers and stuck to the
TPLL performance issues.
Which TPLL graph or plot do you not understand?
You need to ask the experts about the rest.
ws
Warren,
All I wanted was an explanation of how you arrived at femtosecond timing.
You gave me analogies instead. Since you cannot explain it, I ask anyone
else on this listbot if they can put it in proper context for me.
Thank you for your effort regardless.
Bob
- Original Message -
Bob,
I might shed some light on this topic, but my comments apply only
to a few measurements made in my shop, not part of any PLL scheme.
My intent was to determine the apparent noise floor of a Minicircuits
SYPD-2 phase detector; a low offset, low conversion loss, DBM.
The SYPD-2 IF port was
Hi Pete,
I calculated about 0.5uV/V for 10fs, so we are on the same page. I will
need to read this several times for it to sink in, but I much appreciate the
calculations and technical reply!
Thanks!
Bob
- Original Message -
From: Pete Rawson
To: Discussion of precise time
All,
Anybody out there know how to fix an E1938 oscillator? Something in the
metal can has crapped out. No 10MHz, and in turn, no processor action. It
worked a few months ago, turn it on today, and worked after about an hour.
Turned it on again this evening and nothing. I would hate to take
Bob,
guess you know that detailed documentaion is available here:
http://www.prc68.com/I/HPE1938.shtml
http://www.leapsecond.com/museum/e1938a/
Open the can and report back!
Adrian
Robert Benward schrieb:
All,
Anybody out there know how to fix an E1938 oscillator? Something in the
metal can
Adrian,
I have all this stuff. I really don't want to open this thing up, and my
oscillator trouble shooting skills are not that great.
Bob
- Original Message -
From: Adrian
To: Discussion of precise time and frequency measurement
Sent: Saturday, June 19, 2010 11:10 PM
Well, if your not prepared to open it up to fix it yourself, are you
looking for someone else to fix it for you (your postings need
clarifying)?
Steve
On 20 June 2010 16:23, Robert Benward rbenw...@verizon.net wrote:
Adrian,
I have all this stuff. I really don't want to open this thing up,
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