Both ACM and IEEE are publishers at heart. IEEE likes to boast that they
publish almost a third of the world's technical literature.
It's instructive to look at their annual reports, where sources and uses of
funds are documented. Follow the money, always.
Joe Gwinn
Ref:
time-nuts-boun...@febo.com wrote on 05/14/2012 05:04:13 PM:
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement time-
n...@febo.com
Date: 05/14/2012 05:04 PM
Subject: Re: [time-nuts] wwvb weak on east coast especially
when the pre-amps under
The traditional approach was to use a double-balanced mixer configured as a
phase detector, pass the phase detector output through a low-pass filter
(with 1 Hz bandwidth), and plot the result using a chart recorder. The
chart recorder would also have marks from some kind of accurate clock.
After
The usual cause of causality problems is senders' mis-set local computer
clocks. The rest of the email system believes the header date and time.
Joe Gwinn
From: David C. Partridge david.partri...@perdrix.co.uk
To: 'Discussion of precise time and frequency measurement'
I think I know why. I worked on such computers, and they were very
sensitive to ESD. If you touched the cabinet during the winter, when it's
very dry, the spark would be enough to crash the computer, although
permanent damage was rare. The problem was that the computers were
under-designed
I have seen National LMH6702 current-feedback video amplifier chips in
non-inverting amplifier configuration used to implement a wideband 10 MHz
distribution amplifier.
Joe
From: Charles P. Steinmetz charles_steinm...@lavabit.com
To: Discussion of precise time and frequency measurement
It would be interesting if the FTS-1050A curves were also plotted.
Joe
From: John Ackermann N8UR j...@febo.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: 03/25/2012 03:54 PM
Subject:Re: [time-nuts] Distribution amp - Use a
A possible mechanism occurs to me. High-precision GPS is very vulnerable
to multipath errors. A loos connector will have a significant reflection.
The reflected energy will propagate backwards, and be reflected off the
transmitter output discontinuity, the twice-reflected energy propagating
Björn,
time-nuts-boun...@febo.com wrote on 02/23/2012 04:53:06 PM:
From: b...@lysator.liu.se
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: 02/23/2012 04:53 PM
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
Sent by:
With any luck, these same guys had worked in the factory that made the cell
phones in question.
Joe
From: Jim Cotton jim.cot...@wmich.edu
To: time-nuts@febo.com
Date: 02/21/2012 03:17 PM
Subject:Re: [time-nuts] ebay warning
Sent by:time-nuts-boun...@febo.com
In an
As mentioned below, the propagation speed of the various harmonics varies.
What also varies is the temperature coefficient of propagation speed.
This, taken with imperfect impedance matches, yields complicated variation
of zero-crossing times with temperature.
The tempcos are particularly large
The last rollover was in August 1999, just before Y2K, and the next
rollover will be in April 2019.
From: Bruce Lane kyr...@bluefeathertech.com
Under FCC rules, receivers have an economic lifetime, so if one makes
changes slowly enough, it's OK. (I worked for the FCC in the 1970s.)
From: Chuck Forsberg WA7KGX N2469R c...@omen.com
May Google be with you: A search on the title and an author yielded:
http://petrified.ucsd.edu/~ispg-adm/pubs/mtt-s_2006.pdf
From: Luis Cupido cup...@mail.ua.pt
There are some hidden configuration parameters in the TS2100 that vary by
oscillator type (between TCXO,OCXO, and Rb), and include some control loop
parameters. It matters a lot that the firmware uses the correct algorithm
and parameters. The Rubidiums are quite far from the crystals, but I
time-nuts-boun...@febo.com wrote on 11/03/2010 05:55:16 PM:
From:
William H. Fite omni...@gmail.com
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
11/03/2010 05:55 PM
Subject:
Re: [time-nuts] Why .30 cal holes can't be seen at 800 yds...
I have to ask why a simple optical pulse link would not work. For
example, fire a 1 ms pulse from the target area towards the firing area
when the bullet arrives at the target. The firing area electronics hears
the shot and times to the arrival of the optical pulse from the target.
time-nuts-boun...@febo.com wrote on 09/07/2010 02:57:07 PM:
From:
Hal Murray hmur...@megapathdsl.net
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
09/07/2010 03:15 PM
Subject:
Re: [time-nuts] Steve's new QTH...
Sent by:
There is a critical typo below: The author's name is Levinzon, not
Levinson, the s becoming a z. The rest of the cite is correct.
time-nuts-boun...@febo.com wrote on 08/21/2010 08:03:46 AM:
From:
ewkeh...@aol.com
To:
time-nuts@febo.com
Date:
08/21/2010 08:04 AM
Subject:
It's amazing what one can do by hand.
In the 1970s I worked in an electrophysiology lab where we put glass
microelectrodes into rat neurons. The microelectrodes were made in the
lab by heating 1 mm diameter glass tubing to an orange heat and pulling
abruptly. (This was done in a simple
time-nuts-boun...@febo.com wrote on 07/01/2010 12:06:54 PM:
From:
Paul Nicholson vlf0...@abelian.org
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
07/01/2010 12:08 PM
Subject:
Re: [time-nuts] Long period variation of GPS PPS timing?
time-nuts-boun...@febo.com wrote on 07/01/2010 02:01:25 PM:
From:
Paul Nicholson vlf0...@abelian.org
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
07/01/2010 02:02 PM
Subject:
Re: [time-nuts] Long period variation of GPS PPS timing?
Said,
time-nuts-boun...@febo.com wrote on 04/12/2010 09:10:36 PM:
From:
saidj...@aol.com
To:
time-nuts@febo.com
Date:
04/12/2010 09:13 PM
Subject:
Re: [time-nuts] need help with LPF
Sent by:
time-nuts-boun...@febo.com
Hi Joe/Bob,
the board is mounted extremely
Said,
time-nuts-boun...@febo.com wrote on 04/13/2010 12:49:05 PM:
From:
saidj...@aol.com
To:
time-nuts@febo.com
Date:
04/13/2010 12:54 PM
Subject:
Re: [time-nuts] Microphonic Inductor?
Sent by:
time-nuts-boun...@febo.com
Hi there,
I do have space on the PCB,
Said,
time-nuts-boun...@febo.com wrote on 04/12/2010 07:42:39 PM:
From:
saidj...@aol.com
To:
time-nuts@febo.com
Date:
04/12/2010 07:52 PM
Subject:
[time-nuts] need help with LPF
Sent by:
time-nuts-boun...@febo.com
Hello guys,
need some help please:
I am
There is also Young Engineering in Salem, Mass.
http://www.youngengsales.com/
They used to have more electronics stuff, but they seem to have become a
used machine tool dealer. Well, the electronics stuff may be too numerous
and cheap to be worth listing on the website.
time-nuts-boun...@febo.com wrote on 03/21/2010 10:43:40 PM:
From:
Bob Camp li...@rtty.us
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
03/21/2010 10:52 PM
Subject:
Re: [time-nuts] HP 5065A rubidium lifetime
Sent by:
The tar paper is there primarily to reduce air infiltration when the wind
blows. Now days this purpose is served by the white housewrap, the
original brand being Tyvek.
Water that blows past the shingles is stopped by the tarpaper or
housewrap, keeping the sheathing and insulation dry.
...@febo.com
Joseph M Gwinn wrote:
The tar paper is there primarily to reduce air infiltration when the
wind
blows. Now days this purpose is served by the white housewrap, the
original brand being Tyvek.
That doesn't follow. Most houses in the US have attics below
the shingles
A better metric may be stored heat for a dollar's worth of material. Scrap
iron is pretty cheap.
From:
Bob Camp li...@rtty.us
To:
Discussion of precise time and frequency measurement time-nuts@febo.com
Date:
03/10/2010 06:03 PM
Subject:
Re: [time-nuts] Thermal time constant
Sent by:
time-nuts-boun...@febo.com wrote on 03/03/2010 10:56:46 PM:
From:
Bruce Griffiths bruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
03/03/2010 11:03 PM
Subject:
Re: [time-nuts] DMTD Mixer Terminations
Sent by:
time-nuts-boun...@febo.com wrote on 03/02/2010 04:51:15 PM:
From:
Bob Camp li...@rtty.us
To:
'Discussion of precise time and frequency measurement' time-
n...@febo.com
Date:
03/02/2010 04:55 PM
Subject:
Re: [time-nuts] Vremya-ch Hydrogen Masers
Sent by:
The 1PPS signal is actually quite strong. I would hook a telephone
receiver or perhaps a little speaker to the 1PPS output and listen. The
signal should make an audible click once per second.
Joe Gwinn
time-nuts-boun...@febo.com wrote on 02/08/2010 12:01:46 PM:
From:
Mark Sims
time-nuts-boun...@febo.com wrote on 02/02/2010 07:20:24 PM:
From:
Bruce Griffiths bruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 07:27 PM
Subject:
Re: [time-nuts] Triangle Waves
Sent by:
-nuts-boun...@febo.com
Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 02/02/2010 07:20:24 PM:
From:
Bruce Griffithsbruce.griffi...@xtra.co.nz
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
02/02/2010 07:27 PM
Subject
I have the book now. The VHCP used to control the temperature of a Cesium
(not Rubidium) clock utilized in a GPS ground station is stated as
maintaining clock temperature at 57 C +/- 13 C despite a ambient
temperature range of -25 C to +55 C, while handling 5 watts of heat. This
is a 3:
Rich,
Call Symmetricom Tech Support. I'm pretty sure that they produced upgrade
PROMs to solve this exact problem.
Joe Gwinn
From:
Rich Stolte rsto...@accusrc.com
To:
time-nuts@febo.com
Date:
12/15/2009 03:12 PM
Subject:
[time-nuts] Datum Exactime 9390-6000 question
Sent by:
time-nuts-boun...@febo.com wrote on 12/01/2009 07:00:21 PM:
From:
J. Forster j...@quik.com
To:
Discussion of precise time and frequency measurement time-
n...@febo.com
Date:
12/01/2009 07:10 PM
Subject:
Re: [time-nuts] OT: Power level reference
Sent by:
While Britain and Europe may agree on the definition of billion (a
million million), the US differs (a thousand million). So, IEEE standards
use one thousand million and do not use billion.
Joe Gwinn
From:
Arnold Tibus arnold.ti...@gmx.de
To:
Discussion of precise time and frequency
time-nuts-boun...@febo.com wrote on 10/12/2009 04:23:11 PM:
From:
Chris Cheney chris.che...@tesco.net
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
10/12/2009 04:31 PM
Subject:
Re: [time-nuts] unités conventions internationales
Sent
Rick,
time-nuts-boun...@febo.com wrote on 09/17/2009 01:10:32 PM:
From:
Rick Karlquist rich...@karlquist.com
To:
Discussion of precise time and frequency measurement time-
n...@febo.com
Date:
09/17/2009 01:20 PM
Subject:
Re: [time-nuts] Fundamental limits on performance
* large.
Joe Gwinn
Rick
Joseph M Gwinn wrote:
Rick,
time-nuts-boun...@febo.com wrote on 09/17/2009 01:10:32 PM:
From:
Rick Karlquist rich...@karlquist.com
To:
Discussion of precise time and frequency measurement time-
n...@febo.com
Date:
09/17/2009 01:20 PM
Bob,
time-nuts-boun...@febo.com wrote on 08/14/2009 01:05:34 PM:
From:
Robert Darlington rdarling...@gmail.com
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
08/14/2009 02:06 PM
Subject:
Re: [time-nuts] Difference in GPS antennas
Sent
Rex,
time-nuts-boun...@febo.com wrote on 08/04/2009 07:35:51 PM:
From:
Rex r...@sonic.net
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
08/04/2009 07:43 PM
Subject:
Re: [time-nuts] Method for comparing oscillators
Sent by:
as thermal masses.
Sadly, any bottle showing any signs of leakage whatsoever will have to be
replaced, the leaking bottle being uncorked and the contents tested. At
length.
Joe Gwinn
On 16/06/2009, at 2:30 AM, Joseph M Gwinn wrote:
time-nuts-boun...@febo.com wrote on 06/15/2009 06:57:13
time-nuts-boun...@febo.com wrote on 06/15/2009 06:57:13 AM:
They suggest you add a small amount of chlorine bleach to water
containers you store for natural disaster emergencies. You also need
to replace the water on a regular basis even with the bleach in it.
Here in Christchurch, New
time-nuts-boun...@febo.com wrote on 06/15/2009 03:56:42 PM:
Not to charge in, but I've looked at ordinary window pane glass in very
old
buildings and you can actually see the rippling effect that occurred
over
time, showing the flow of the glass toward the lower edge of the pane.
One
time-nuts-boun...@febo.com wrote on 06/15/2009 05:49:35 PM:
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster
Sent: Monday, June 15, 2009 2:34 PM
To: Discussion of precise time and frequency measurement
Subject:
time-nuts-boun...@febo.com wrote on 06/10/2009 03:13:19 AM:
In message 4a2efc6d.4020...@xtra.co.nz, Bruce Griffiths writes:
Bruce,
The thermal time constant (not the thermal impedance per se) is what
matters [...]
That is pretty much exactly the (mis-)definition of thermal impedance.
time-nuts-boun...@febo.com wrote on 06/10/2009 07:23:56 PM:
Joseph M Gwinn wrote:
I read somewhere the suggestion to take the cast iron block
from an old
automobile engine and put it in a heavy insulated wooden
cabinet: ~250 Kg
of iron in an insulated box. Cracked blocks
time-nuts-boun...@febo.com wrote on 05/27/2009 10:43:18 PM:
Does anybody know of any PCI cards that will receive IRIG-B time
signals and come with an I/O driver for AIX (IBM's flavor of UNIX)?
Industrial-grade commercial products are preferred.
In the past I have, on one occasion, been
time-nuts-boun...@febo.com wrote on 05/28/2009 11:08:31 AM:
And depending on what you mean by industrial grade, they also have
the bc635 board in a CompactPCI form-factor, too. Or at least they
used to some years ago.
I remember that card from 1995! The BC635 would be suitable. If still
time-nuts-boun...@febo.com wrote on 04/29/2009 03:50:12 PM:
I'm sure there was a message on this group a month or two ago,
where the bottom
line was to read the EPROMs with a slightly lower than usual voltage.
Look up schmoo plots, which are used to determine the temperature by
supply
time-nuts-boun...@febo.com wrote on 04/13/2009 11:32:48 AM:
bro...@pacific.net skrev:
Hi Magnus:
Why not just put the GPS antenna at the top of the existing TV mast?
http://www.prc68.com/I/Ant.shtml#SBant
It would be a little bit of a challenge... I think I have some 4-5 meter
of
time-nuts-boun...@febo.com wrote on 04/02/2009 06:00:17 PM:
Hal Murray wrote:
LVDS may be useful for frequency distribution between circuit boards.
Good idea thanks.
Receivers designed for LVDS are probably good even if the
input signal is
single ended. Just couple the input
The simpler way to prevent mangling of URLs is to put corner brackets
... around the URL. This lets the email reader know where the URL
starts and ends. So, for instance:
A while back, there was a discussion on how best to use double balanced
diode ring mixers for delay measurements. I came upon a very useful paper
by Enrico Rubiola:
Tutorial on the double balanced mixer, Enrico Rubiola, 21 Aug 2006 , 52
pages, arXiv:physics/0608211v1 [physics.ins-det].
Magnus,
time-nuts-boun...@febo.com wrote on 01/20/2009 04:47:26 PM:
Joseph M Gwinn skrev:
time-nuts-boun...@febo.com wrote on 01/20/2009 04:32:15 PM:
Bruce Griffiths skrev:
The relatively low thermal conductivity of the steel can will help
considerably in avoiding thermal damage
Chuck,
time-nuts-boun...@febo.com wrote on 01/21/2009 11:34:41 AM:
Hi Joe,
Nope, Magnus is talking about foam insulated hermetically sealed
ocxo's.
The point you are missing is the preheater is only set for a temperature
that the foam, etc. can take on a continuous basis... such as
.
Joe
-Chuck Harris
Joseph M Gwinn wrote:
Chuck,
time-nuts-boun...@febo.com wrote on 01/21/2009 11:34:41 AM:
Hi Joe,
Nope, Magnus is talking about foam insulated hermetically sealed
ocxo's.
The point you are missing is the preheater is only set for a
temperature
time-nuts-boun...@febo.com wrote on 01/20/2009 04:32:15 PM:
Bruce Griffiths skrev:
The relatively low thermal conductivity of the steel can will help
considerably in avoiding thermal damage if the heat is
applied to the joint.
If the can were copper it would be much more difficult to
Magnus,
time-nuts-boun...@febo.com wrote on 01/07/2009 10:47:46 PM:
Joseph,
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed, RS422 works fine with transformers.
Yes. It would be 10 MHz or 20 MHz, depending on coding. Or 5 MHz,
time-nuts-boun...@febo.com wrote on 01/08/2009 03:47:29 AM:
In message OF3277AC5A.F5D1FAE8-ON85257537.008059CF-85257537.
00817...@mck.us.ray.com, Joseph M Gwinn writes:
Was there a big bang? What was the source of the 600 amps?
They replaced the separation transformer with a UPS
Magnus,
time-nuts-boun...@febo.com wrote on 01/07/2009 01:27:52 AM:
Joseph M Gwinn skrev:
First the background:
In some timing distribution applications, the primary source of
interference comes from different ground voltages in different parts
of
the facility, such as a ship
Poul-Henning,
time-nuts-boun...@febo.com wrote on 01/07/2009 04:25:04 PM:
In message OFADE54B4F.D29DBA7A-ON85257537.00086866-85257537.
00090...@mck.us.ra
y.com, Joseph M Gwinn writes:
The effect of differing ground potentials on a shielded cable is to
pull a
large current through
Poul-Henning,
time-nuts-boun...@febo.com wrote on 01/07/2009 05:56:19 PM:
In message OF56303512.93B049A7-ON85257537.0079CDE3-85257537.
007cc...@mck.us.ra
y.com, Joseph M Gwinn writes:
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed
First the background:
In some timing distribution applications, the primary source of
interference comes from different ground voltages in different parts of
the facility, such as a ship or a megawatt radar.
The effect of differing ground potentials on a shielded cable is to pull a
large
Bruce,
time-nuts-boun...@febo.com wrote on 12/17/2008 03:43:16 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/16/2008 10:21:55 PM:
[snip]
[BG] Obtaining suitable mixers for 5MHz and 10MHz input frequencies
or even
100MHz is easy.
However
Bruce,
time-nuts-boun...@febo.com wrote on 12/17/2008 06:26:00 PM:
[snip]
[BG] It isn't necessary to use a pair of mixers and an offset source
to
characterise the sound card, driving both sound card inputs from the
same audio source should suffice.
[JG] Yes. One input at a
Bruce,
time-nuts-boun...@febo.com wrote on 12/16/2008 10:21:55 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
[snip]
Bruce wrote:
A CB stage probably isn't optimum for the mixer preamp so that lower
value caps can be used provided that they effectively short the
amplifier input
Bruce,
time-nuts-boun...@febo.com wrote on 12/15/2008 06:42:59 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com [Bruce] wrote on 12/15/2008 04:56:26 PM:
[snip]
The only configuration for which it makes any sense is an
inverting
input amplifier
Bruce,
time-nuts-boun...@febo.com wrote on 12/15/2008 05:31:27 PM:
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/15/2008 04:34:34 PM:
[snip]
I need to build a noise source to check the absolute level.
Will use the amplified Johnson noise of a 150K
Bruce,
time-nuts-boun...@febo.com wrote on 12/16/2008 08:43:29 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/15/2008 06:42:59 PM:
[snip]
However the proposed remedy has little or no effect on the errors
caused
by such bias currents (eg
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 08:36:47 PM:
Joe
Attached is noise spectrum (1kHz and below) of AP192 with nothing
connected to inputs.
Sampling rate 96KSPS.
Frequency bin equivalent noise bandwidth ~ 3Hz.
Noise has similar spectrum to flicker noise with a noise
separate OCXOs.
Detailed in line post follows:
Bruce
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/10/2008 08:38:13 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
Reflecting the sum frequency back into the mixer is actually
necessary
to reduce
Bruce,
time-nuts-boun...@febo.com wrote on 12/15/2008 04:34:34 PM:
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 08:36:47 PM:
Joe
Attached is noise spectrum (1kHz and below) of AP192 with nothing
connected to inputs.
Sampling rate 96KSPS
Bruce,
time-nuts-boun...@febo.com [Bruce] wrote on 12/15/2008 04:56:26 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
time-nuts-boun...@febo.com wrote on 12/11/2008 07:44:01 PM:
[snip]
Using a passive splitter for the LO drives will gain at least another
30dB in isolation
Bruce,
time-nuts-boun...@febo.com wrote on 12/10/2008 08:38:13 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
Reflecting the sum frequency back into the mixer is actually
necessary
to reduce the noise at the IF port.
I believe that one of Agilent's simulation application notes mentions
Bruce,
[EMAIL PROTECTED] wrote on 12/09/2008 09:20:08 PM:
Joe
Joseph M Gwinn wrote:
Bruce,
A PCB mount mixer package is also preferable as its then much easier
to
use a capacitive IF port termination (for lower noise) in conjunction
with series resistors at the RF and LO ports
Bruce,
[EMAIL PROTECTED] wrote on 12/10/2008 04:46:50 PM:
Joe
Another limitation on using too low a beat frequency is imposed by the
increasing equivalent input noise spectral density of the sound card as
the frequency decreases.
Yes, although people made good use of 1 Hz in DMTD
measurement
Subject: Re: [time-nuts] Sub Pico Second Phase logger
Joe
Joseph M Gwinn wrote:
Bruce,
Reflecting the sum frequency back into the mixer is actually
necessary
to reduce the noise at the IF port.
I believe that one of Agilent's simulation application notes mentions
this effect
Bruce
[EMAIL PROTECTED] wrote on 12/08/2008 07:12:22 PM:
Joseph M Gwinn wrote:
Bruce,
[EMAIL PROTECTED] wrote on 12/08/2008 05:53:08 PM:
Joseph M Gwinn wrote:
People used passive mixers driving electromechanical stripchart
recorders
to compare high-stability oscillators
Bruce,
[EMAIL PROTECTED] wrote on 12/09/2008 07:10:55 PM:
Paper with capacitive IF port termination data:
http://tf.nist.gov/timefreq/general/pdf/112.pdf
This one is new to me, and interesting. More later, when I've read it.
Phase detector sensitivity to distortion:
Bruce,
[EMAIL PROTECTED] wrote on 12/09/2008 06:24:22 PM:
Joseph M Gwinn wrote:
Bruce
[EMAIL PROTECTED] wrote on 12/08/2008 07:12:22 PM:
[snip]
Many mixers have IF response down to DC.
Oops, I meant single diode type double balanced mixer style phase
detector
Bruce,
[EMAIL PROTECTED] wrote on 12/09/2008 07:55:50 PM:
Joseph M Gwinn wrote:
Bruce,
[EMAIL PROTECTED] wrote on 12/09/2008 07:10:55 PM:
Paper with capacitive IF port termination data:
http://tf.nist.gov/timefreq/general/pdf/112.pdf
This one is new to me
People used passive mixers driving electromechanical stripchart recorders
to compare high-stability oscillators in the good old days.
One assumes that there is a purely analog approach to measurement of
picosecond changes in delay at 10 MHz using a single oscillator, but I
have not seen any
Bruce,
[EMAIL PROTECTED] wrote on 12/08/2008 05:53:08 PM:
Joseph M Gwinn wrote:
People used passive mixers driving electromechanical stripchart
recorders
to compare high-stability oscillators in the good old days.
One assumes that there is a purely analog approach to measurement
[EMAIL PROTECTED] wrote on 11/24/2008 08:31:22 PM:
Bruce wrote:
Analog time constants of several hours are generally considered
impractical due to the lack of suitable low noise components
principally high value resistors and capacitors.
So how do you propose to get around this
[EMAIL PROTECTED] wrote on 11/06/2008 12:07:43 PM:
Thanx for the reply.
I was looking for a reference to s specific amount of time that
clocks needs
to be in sync, i.e., within 10 seconds. You mentioned PCI.
Yes, it requires
synchronization, but in section 10.4, it does not mandate
Would SAW oscillators be better than crystals?
Joe
[EMAIL PROTECTED] wrote on 10/23/2008 07:01:31 PM:
Steve Rooke wrote:
Hi,
I believe it was pointed out earlier that the output of a LPRO uses
some form of xtal oscillator as the output of the rubidium stage is
quite noisy.
[EMAIL PROTECTED] wrote on 10/23/2008 08:15:01 PM:
Joseph M Gwinn wrote:
Would SAW oscillators be better than crystals?
Joe
They still rely on using a piezoelectric crystal as does a BAW
oscillator.
There's no reason to believe that they would be immune to frequency
jumps
[EMAIL PROTECTED] wrote on 09/24/2008 08:44:30 PM:
On Mon, 22 Sep 2008 15:52:19 +1200, [Gerhard] wrote:
[snip]
For maximum phase stability the BNC connectors should replaced by
threaded connectors such as TNC, SMA , N etc.
The next iteration will have to live with BNC because RS smpd,
[EMAIL PROTECTED] wrote on 08/02/2008 04:38:14 PM:
[snip]
It would be nice to find a relatively simple and inexpensive 10MHz
synthesizer that has a resolution of closer to 1E-14 to avoid messing
with the EFC at all.
A 48-bit-accumulator DDS chip such as the Analog Devices AD9852 will
The turning into goo is called reversion, and is a property of some
kinds of polyurethane. There is a good explanation in US patent 4040991,
and in www.wolaa.org/files/Spring_2007_OHS_-_WOL_In-house_Expertise.pdf .
It can be difficult to find a solvent for the goo.
As for corrosion causing
[EMAIL PROTECTED] wrote on 06/04/2008 08:05:16 PM:
WB6BNQ wrote:
Ulrich,
One of things I noticed when playing with that DDS design
tool is you can achieve
the same output frequency using a different clock frequency,
thus removing the
spurs. THe trick is to look at clock
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