When close enough is good enough :-)
http://www.thingsyouneverknew.com/website/store/product_detail.asp?UID=2007020820322012item%5Fno=80153keyword=F1JScat%5Fkeyword=F1JSsearch%5Fpage%5Fno=page%5Fno=ltype=featWT.svl=FeaturedItem1WT.ac=FeaturedItem1
___
OK, but can it accept an external clock source? I think we could
improve the performance by replacing the built-in oscillator. :-)
John
Joseph Gray said the following on 03/31/2007 04:42 AM:
When close enough is good enough :-)
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Ultra low phase noise floor measurement system for RF
devices.
Date: Fri, 30 Mar 2007 22:04:05 EDT
Message-ID: [EMAIL PROTECTED]
In a message dated 3/30/2007 12:26:46 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Until I've actually
From: John Ackermann N8UR [EMAIL PROTECTED]
Subject: Re: [time-nuts] Anti-time-nuts clock
Date: Sat, 31 Mar 2007 07:48:56 -0400
Message-ID: [EMAIL PROTECTED]
OK, but can it accept an external clock source? I think we could
improve the performance by replacing the built-in oscillator. :-)
(As
Dear colleagues,
I am new in this community, so I wish to introduce myself.
Born in 1957, built the first receiver at the age of 11 and
realized immediately afterwards that that radio engineering
is much easier than social relationships. Yet never got a
call sign (shame on myself). Now I am a
Hi, Enrico --
I think a lot of us already tracked down your (excellent) site based on a
couple of links to your papers that were mentioned on the list earlier.
Thanks for making that content available! These days, it seems that half of
Google's search results on any given topic point to sites at
I HAVE GOT TO GET ME ONE OF THESES!!!
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Joseph Gray
Sent: Saturday, March 31, 2007 3:42 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Anti-time-nuts clock
When close enough
John Miles said the following on 03/31/2007 02:45 PM:
(I was going to ask if you had any
thoughts on Charles Wenzel's similar article on noise-measurement preamp
design, but I see the link on his page at
http://www.wenzel.com/documents/measuringphasenoise.htm is now broken...)
John, I'm not
Yep, that's the one. It used to be linked from his measuringphasenoise.htm
page but the link now points to something on his own f: drive, which is
sadly inaccessible to the rest of us...
-- john, KE5FX
John, I'm not sure if this is the article you had in mind, but there's a
design for a low
On Sat, 31 Mar 2007 11:45:08 -0700, John Miles [EMAIL PROTECTED] wrote:
(I was going to ask if you had any
thoughts on Charles Wenzel's similar article on noise-measurement preamp
design, but I see the link on his page at
http://www.wenzel.com/documents/measuringphasenoise.htm is now broken...)
John Miles said the following on 03/31/2007 03:16 PM:
Yep, that's the one. It used to be linked from his measuringphasenoise.htm
page but the link now points to something on his own f: drive, which is
sadly inaccessible to the rest of us...
Yes, a bunch of the Wenzel links point to F:, but
John Miles wrote:
Hi, Enrico --
I think a lot of us already tracked down your (excellent) site based on a
couple of links to your papers that were mentioned on the list earlier.
Thanks for making that content available! These days, it seems that half of
Google's search results on any given
In a message dated 3/31/2007 04:50:11 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I agree, it is indeed a fantastic number, but you have to compare it with
other results. There is comercial tools out there which is only 20-30 dB
behind. Actually, the correlation techniques improves
In a message dated 3/30/2007 23:47:12 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Thermal noise and other noise in each channel are statistically
independent and their product averages to zero.
The actual residual decreases as the number of spectra averaged increases.
Hi Bruce,
[EMAIL PROTECTED] said the following on 03/31/2007 07:08 PM:
Does anybody have any experience with using real Audio analyzers for these
phase noise measurements?
I am particularly interested in how to calibrate the system, and find the
descriptions at Wenzel lacking, and at Vectron not
[EMAIL PROTECTED] wrote:
In a message dated 3/30/2007 23:47:12 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Thermal noise and other noise in each channel are statistically
independent and their product averages to zero.
The actual residual decreases as the number of spectra
John Ackermann N8UR wrote:
John Miles said the following on 03/31/2007 03:16 PM:
Yep, that's the one. It used to be linked from his measuringphasenoise.htm
page but the link now points to something on his own f: drive, which is
sadly inaccessible to the rest of us...
Yes, a bunch
Dr Bruce Griffiths said the following on 03/31/2007 08:36 PM:
Some MSWindows html editors (e.g. Open Office) are notorious for
automatically substituting the fully qualified link path for a relative
link path, that has been typed in so that the page should have been
reasonably portable. If
From: John Ackermann N8UR [EMAIL PROTECTED]
Subject: Re: [time-nuts] phase noise and related stuff
Date: Sat, 31 Mar 2007 20:49:09 -0400
Message-ID: [EMAIL PROTECTED]
Dr Bruce Griffiths said the following on 03/31/2007 08:36 PM:
Some MSWindows html editors (e.g. Open Office) are notorious
[EMAIL PROTECTED] wrote:
Hi Magnus,
BTW: here in the US they also like to measure things in fractions, and body
part lengths for some unexplainable reason... Reasons I do hear are that SI
is too difficult for the average Joe to comprehend, and replacing road
signs
costs too
From: John Ackermann N8UR [EMAIL PROTECTED]
Subject: Re: [time-nuts] Ultra low phase noise floor measurement system for RF
devices.
Date: Sat, 31 Mar 2007 19:48:07 -0400
Message-ID: [EMAIL PROTECTED]
[EMAIL PROTECTED] said the following on 03/31/2007 07:08 PM:
Does anybody have any
Dr Bruce Griffiths said the following on 03/31/2007 08:24 PM:
The second reason is somewhat spurious, other countries have converted
from the imperial to the metric system without major difficulty or
expense. It wasn't even necessary to change all road signs overnight.
There's a joke about
Magnus Danielson wrote:
I'm considering putting that new and shiny audio analyzer to some alternative
use that I bought at work. Preferences towards BNC, XLR or Banana-jacks
anyone?
:)
I was just looking at the 3048 manuals the other night. Bumped into a new site
with HP manuals I haven't
John Ackermann N8UR wrote:
Dr Bruce Griffiths said the following on 03/31/2007 08:24 PM:
The second reason is somewhat spurious, other countries have converted
from the imperial to the metric system without major difficulty or
expense. It wasn't even necessary to change all road signs
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Ultra low phase noise floor measurement system for RF
devices.
Date: Sun, 01 Apr 2007 13:49:03 +1200
Message-ID: [EMAIL PROTECTED]
Magnus
Hej Bruce,
Balanced low frequency signal transmission with shielded cables is
easier
In a message dated 3/31/2007 18:21:40 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I was just looking at the 3048 manuals the other night. Bumped into a new
site
with HP manuals I haven't seen before.
Cheers,
Magnus
Hi Magnus,
do you have URL pointer?
thanks,
Said
In a message dated 3/31/2007 18:14:01 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Since the average person in the rest of the world copes with the metric
system without any difficulty, the first reason would appear to be based
on a tacit assumption that average US citizen is less
In a message dated 3/31/2007 17:29:21 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Multiplying the 2 signals is essential as the non correlated components
of the 2 signals will then average to zero (for infinite measurement
time) whilst the correlated components of the 2 signals will
The other reason the machinists aren't thrilled with SI units is that
thousandths of an inch are actually a pretty good match for the precision
they usually deal with. In SI, you'd have to deal with micrometers
(microns?), which is too much resolution for most applications, or
millimeters, which
That's nothing:
A month before Nigeria switched sides they had a practice week!
REM, N1VQR
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of John Ackermann N8UR
Sent: Saturday, March 31, 2007 9:41 PM
To: Discussion of precise time and frequency
[EMAIL PROTECTED] wrote:
Hi Bruce,
got it, thanks.
But isn't a signal source typically single-ended, and has a 50 Ohm source
impedance which creates noise?
Wouldn't we need a source with 1 Ohm source impedance even if the
measurement system is cross-correlated?
Would a
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Ultra low phase noise floor measurement system for RF
devices.
Date: Sat, 31 Mar 2007 23:33:26 EDT
Message-ID: [EMAIL PROTECTED]
In a message dated 3/31/2007 17:29:21 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Multiplying the 2
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Ultra low phase noise floor measurement system for RF
devices.
Date: Sat, 31 Mar 2007 23:19:54 EDT
Message-ID: [EMAIL PROTECTED]
Hej Said,
In a message dated 3/31/2007 18:21:40 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I was just
Magnus Danielson wrote:
In the article that was recently referred to, it was not a measurement rig for
oscillators but for transfer components, such as gain-stages, phase shifters
etc. and the approach is different then, since you do have the signal prior to
being dirtyfied. Thus, the
In France, and I suspect in the rest of the world, machinists talk in
1/100th of a mm (centieme in French). The 'centieme' is a very good
fractional unit when dealing with hardware. It is not harder to talk in
1/100th of a mm than in 1/1000th of an inch. The micrometre (micron in
French, as
I like Joe's editor myself (Wordstar background). A colleague and I are
having ongoing arguments about vi versus Joe's. I say it takes many more
keystrokes to do the same job under vi, she says it does not take her
any longer than me to do anything because I am a lousy typist, I tell
her if
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