On 6/23/15 4:02 PM, Tim Shoppa wrote:
Yes, for ferrites, many (all?) of the Amidon FT-xxx parts are perfectly
standard Fair-Rite cores available from full-line distributors like Mouser,
Newark, etc.
Iron powder cores are not stocked by any of the standard distributors that
I know of, but
https://support.microsoft.com/en-us/kb/909614
basically: ignore the leap second, so your computer is fast relative
to UTC, and next time you resynchronize time it adjusts
Windows, these days, runs NTP
http://blogs.msdn.com/b/mthree/archive/2015/01/08/leap-seconds-010815.aspx
On 6/22/15 12:02 PM, Attila Kinali wrote:
Hi,
I was looking up some stuff and realized (again) that I don't know
anything about how magnetic electronic components (inductors/solenoids,
transfomers, baluns, ferrite beads...) work. Yes, I can calculate
the inductance, I know how to get from the
On 6/23/15 4:25 AM, Tim Shoppa wrote:
Experimental Methods in RF Design has a half-dozen pages specifically on
the choices of powdered iron and ferrite materials, and lots of working
circuits and designs with measurements. Aka EMRFD.
http://www.arrl.org/shop/Experimental-Methods-in-RF-Design
On 6/21/15 11:28 AM, Don Latham wrote:
Just for fun, went to the site. $149 for basic, but by the time I added all
the toolboxes I thought (!) I needed, I was over $750. sigh.
Don
Hence the popularity of the student license (or Octave)
___
on an open loop microwave source down to 10
Hz. Not quite the VCO Jim
was looking for, but close ….
page 25 shows down to 100 Hz, Typical Free-Running Source at 10 GHz.
Eyeballing it it looks like 20dB/decade from 10-100k, a bit more from
1-10k, and almost 30 dB/decade from 100Hz to 1k. I
On 6/20/15 3:03 PM, Dave Daniel wrote:
I wish the MathWorks would resume that practice. Back in the late 90s
they would sell one licenses for MatLab and SimuLink for an affordable
price if one singed an agreement that restricted one to personal
(specifically, non-commercial) use. My copy from
On 6/18/15 1:46 PM, Brooke Clarke wrote:
Hi Mark:
Is there any documentation on the HB100?
first hit on google for HB100 microwave sensor (recognizing that what
comes up as *my* first hit will probably be different than *your* first
hit)...
On 6/18/15 3:46 AM, Bob Camp wrote:
Hi
Be careful when you do find the data.
When you go very close in on something like a VCO, you get much higher phase
noise
than we normally worry about. Some of the “assumptions” that underly the
measurements
are no longer true. Small angle of modulation
On 6/18/15 10:05 AM, Mark Sims wrote:
If you want to play with a homodyne doppler radar, search Ebay for hb100 microwave
sensor. It is a cute little 10 GHz doppler module that costs around $6. It can
be operated in continuous or pulsed mode. The output does require a couple of op-amps to
On 6/17/15 1:08 PM, Magnus Danielson wrote:
Jim,
John Miles have been a bit active:
http://www.ke5fx.com/brick/brick.htm
Just to give you a start-sample.
those seemed to be all PLL outputs.. I didn't see the bare VCO data.
And, I'm really interested in the 1 Hz to 100 Hz kind of range
On 6/17/15 1:08 PM, Richard (Rick) Karlquist wrote:
On 6/17/2015 8:22 AM, Jim Lux wrote:
I'm looking for some representative data for inexpensive microwave VCOs
(in the 2.5-6 GHz range, in general). Not in a locked loop situation,
If the phase noise data you have goes to a low enough
On 6/17/15 6:15 PM, John Miles wrote:
Also see http://www.ke5fx.com/gunnpll.html , a quick and dirty but
successful attempt at locking a Gunnplexer in a relatively low (1
kHz) loop bandwidth. The inband noise is likely too high for good
performance in a radar application, but the basic idea is
I'm looking for some representative data for inexpensive microwave VCOs
(in the 2.5-6 GHz range, in general). Not in a locked loop situation,
but just bare: with a DC voltage on the tuning input. I'm particularly
interested in data closer than 100 Hz.
Most of the data sheets (e.g. from
http://www.slate.com/articles/health_and_science/science/2015/06/next_leap_second_june_30_dangers_to_software_military_gps_banking_air_traffic.2.html
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All:
Just acquired Rhode Schwarz GPS receiver (and 10 Mhz reference
oscillator) ED167MP. Looking for manual; struck out on RS site and
KO4BB.com
Anybody have one? Suggestions?
Thanks,
Jim
wb4...@amsat.org mailto:wb4...@amsat.org
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On 6/2/15 4:07 AM, Bob Camp wrote:
Hi
The one thing I would be a bit careful about is the power levels.
Consider an 8 port hub:
5V 3A from each would be 24A total. That’s pretty unusual. Most hubs
give you one or two high current outputs.
There are very few 8 port hubs and lots of 7 port
On 5/18/15 11:06 AM, Brooke Clarke wrote:
Hi Bob:
In the link in the message from Brian it explains that iGPS is for
military users of the Iridium system.
The key feature is to allow a moving vehicle to lock on the GPS signal
while being jammed. They do that and also get a more accurate fix by
On 5/18/15 7:59 PM, Chris Albertson wrote:
Yes GPS can do better than 50M but we are talking about a single fix
from a cell phone in a moving car not a survey receiver. . The
displayed location is better because the phone applies a filter to the
location data. Some thing like a Kalman filter.
On 5/12/15 4:00 PM, Tucek, Joseph wrote:
I'm looking for information on non-GPS time sources.
For background, I need to provide PTP to a cluster where we don't have line of sight to
the sky, and are unlikely to get roof-rights without a fight. There are CDMA solutions
that would work (e.g.
On 5/11/15 12:52 PM, Adrian Godwin wrote:
Is it driven as an inductive loop? That might put it under different
regulations.
On 11 May 2015 17:47, Chuck Harris cfhar...@erols.com wrote:
Yes, but in the case of the lawnmower fence, and the
invisible dog fence, the transmitter drives the fence
On 5/10/15 11:40 PM, Poul-Henning Kamp wrote:
In message 45C7C6B09BC548C19241E4E0673E9E9F@system072, Bill Hawkins writes:
Did the pictures have to be in SVG format?
Is this only a problem for those who routinely use SVG?
A problem how ?
I *like* SVG since you can zoom without
On 5/8/15 11:37 PM, Poul-Henning Kamp wrote:
In message fc02a5e8-5396-4474-a307-546e10909...@n1k.org, Bob Camp writes:
The “put the antenna up and rotate it to see what happens” experiment
has indeed been done. The objective was not correcting the antenna’s
issues, but validating that
On 5/9/15 5:15 AM, Poul-Henning Kamp wrote:
I spent some time capturing some data today.
The measurements is from my $20 loop-antenna in the attic, which is
something like 8 meters up and 10 meters besides the lawn-mower loop:
http://phk.freebsd.dk/time/20150509.html
Clearly, you
On 5/6/15 3:09 PM, Bob Camp wrote:
GPS helix antennas were a really big deal in about 1982. Once people started to
get experience with GPS and a variety of designs, they became less of a big
deal. I do not know of any modern
precision antennas that use a helix.
Most precision antennas
On 5/7/15 7:23 AM, Attila Kinali wrote:
On Sun, 03 May 2015 07:29:30 +
Poul-Henning Kamp p...@phk.freebsd.dk wrote:
When you post-process raw GPS data you get to include antenna phase
center / gain / az/el corrections for free.
Speaking of which...
I wonder if anybody ever made a
On 5/6/15 12:53 AM, John Marsden wrote:
Ok, I only ask becuse there seemed to be a big thing about LHCP quad helix
antennas - even to the point of seein an article showing how to 'unwrap. a RHCP
Q-H, and rewrap it 'inside-out' to change the polarisation to LHCP.
I'm seriously considering
On 4/20/15 12:59 AM, Attila Kinali wrote:
Moin,
On Mon, 20 Apr 2015 00:40:06 -0700
Tom Van Baak t...@leapsecond.com wrote:
Mechanical, yes. Home brew, no. It is an absolutely stunning clock,
both in beauty and performance.
Given the fact that a CNC milling machine can be bought quite
On 4/20/15 7:25 PM, Charles Steinmetz wrote:
Unfortunately, you are unlikely to do any better than this with the
antenna location you described. Time to buy a house, with no tall trees
nearby. (You may already have heard that time-nuttiness can be
expensive ;-)
Actually, what you
On 4/18/15 7:02 AM, Bob Camp wrote:
Hi
Many years ago while standing around (between races) with some pretty good
stopwatches, a group of us decided to see
just how well a set of people could time the same pair of start / stop events.
Our conclusion was that as a
group we could get agreement
An interesting look back: it's a copy of a Tracor ad showing someone
carrying a portable Rb clock down the stairs of a PSA plane. Lots of
history in that photo: no jetway, PSA, people wearing coat and tie on an
airplane. Even the street name for GTC, on Bellanca Av, redolent of
long-gone
What's been added? This is a brilliant book, but I need to know what the
updates are!
Jim
On 17 April 2015 at 18:12, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 20150417074427.ga31...@sol.ermione.com, Andrea Baldoni
writes:
Hello.
In the case someone missed the new
On 4/7/15 11:33 AM, Magnus Danielson wrote:
Hi,
O
One might look at the available frequencies and see if there is a
telemetry band available which allows wider bandwidth. For the
application, I don't see that very much transmitted power is needed.
If the OP is a licensed amateur radio
On 4/6/15 2:14 AM, Attila Kinali wrote:
Moin,
On Fri, 03 Apr 2015 22:51:34 -0500
Robert Watzlavick roc...@watzlavick.com wrote:
On 04/03/2015 10:12 PM, Robert Watzlavick wrote:
I have an amateur radio license (mostly CW/HF and some VHF/UHF
experience) and I've written some driver software for
On 4/6/15 2:21 AM, Attila Kinali wrote:
On Sat, 04 Apr 2015 08:49:01 +0200
Magnus Danielson mag...@rubidium.se wrote:
This is on either side of the amateur 23 cm band. That's also the first
band where you have bandwidth enough to fool around with stuff like this
without breaking the bandplan.
On 3/28/15 10:27 AM, Bob Camp wrote:
Hi
So If the rocket continuously accelerates at 10,000 G’s, you will get a 20 ppm
shift
with typical sensitivity. If you do this for very long, you will also get into
time dilation issues.
(you hit 0.1C in 2 minutes).
10,000G is more like an
On 3/25/15 7:27 PM, Robert Watzlavick wrote:
I'm working on a project that I could use some advice on and also might
be of interest to the list. If it's not appropriate for the list, my
apologies.
I want to develop a tracking system for an amateur rocket that can allow
me to track the rocket
On 3/1/15 10:23 AM, Joseph Gwinn wrote:
time-nuts Digest, Vol 128, Issue 1, Message: 8
Date: Sat, 28 Feb 2015 17:46:18 -0800
From: Jim Lux jim...@earthlink.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] simple explanation of noise
the IC for sale. Any info appreciated.
thanks
Jim
http://www.etestmanuals.com/Search.aspx?Mfg=MON
Ebay listing for a monsanto counter / timer
VINTAGE-Monsanto-110B-Programmable-Counter-Timer-/
http://www.ebay.com/itm/331268326313
Monsanto IC:
Monsanto-SD102-Vintage-Very-Rare-White-Ceramic-Gold
Is there a handy one pager kind of explanation of noise spectra after
some forms of signal processing..
For instance, if you have a oscillator which has a 1/f characteristic,
and you mix it with itself, what is the spectra of the output of the mixer.
Or if you have a 1/f^3 characteristic
On 2/27/15 3:23 AM, Flemming Larsen wrote:
Check the price here:
Patek Philippe Digital Display Clock
| |
| | | | | | | |
| Patek Philippe Digital Display ClockVintage digital display clock by Patek
Philippe of Geneva. Made for Abou Watfa of Damascus, circa 1970. Rare Patek
In yesterday's Wall Street Journal (or maybe USA Today, I can't remember..)
Nice Nixie displays...
I wonder if it normally displays the same time on all, or if it is a
multi-time zone/elapsed time kind of thing. It looks a lot like clock
display stacks used for displaying Mission Elapsed
On 2/21/15 9:32 AM, Alberto di Bene wrote:
So I agree that the best use I can make of that Navstar mushroom unit
is to pry it open, and try to find the
electrical signals before they are converted to optical... at least now,
thanks to David, I know what the supply
voltage of the beast is...
Alberto posted some pictures of a GPS receiver from Navstar Systems Ltd..
They're still in business, but don't appear to be doing that any more..
However, I did run across this:
Sarantel is a spin-off of Symmetricom founded in 2000 by Dr. Leisten.
Leisten was spearheading the development of a
On 2/20/15 6:30 AM, Chris Albertson wrote:
I think the easiest cable to make really long, if one must be long is the
antenna cable. Use 100 meters of the kind of cable they use for cable
TV. It comes double shield and has those compression type F connectors.
The cable can cary both the GPS
On 2/19/15 1:59 AM, Attila Kinali wrote:
On Thu, 19 Feb 2015 10:51:04 +0100
Attila Kinali att...@kinali.ch wrote:
When i had one on my desk, i opened it up, but apparently i forgot to take
pictures. From what i remember, i think it works either similar to the
VNWA design done by DG8SAQ[1,2]
On 2/19/15 9:11 AM, Matt wrote:
Hi,
My university would like to have a 1ms precise source of time to do
some networking experiments (measure one way propagation delays
etc...). So I wandered on the internet to find the best choice with a
budget of ~1000€ (~1100 American dollars).
I've been
On 2/18/15 1:49 AM, Attila Kinali wrote:
You could try tinyVNA[1]. I have used it once, it has some quirks
(it's half hobby, half commercial project and that shows) but works
otherwise. I have no idea how accurate it is.
Attila Kinali
[1]
The latest rev of the CSAC data sheet (rev H) shows the max
non-operating temperature to be 40C..
and operating from -10 to +35C
that's a substantial difference from the former version of the sheet
which presumably had the temperatures from the summary page:
The Quantum SA.45s Chip Scale
On 2/8/15 2:11 AM, Attila Kinali wrote:
On Sat, 7 Feb 2015 10:07:44 -0800
Tom McDermott tom.n...@gmail.com wrote:
While compensating for cable delay is relatively straight forward by
measuring the length and compensating for
the velocity factor, a question is: how much amplifier / filter group
from a freq counter for some ADEV measurements. Once
HYPERTRM runs, no other program can access the serial port.
Good point, I tried TimeLab direclty after fresh reboots, but the
interfaces are still invisible.
Jim Lux jim...@earthlink.net
One trick with Windows is to disable and then renable
On 2/6/15 12:42 PM, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
The typical noise generator chips uses a PRNG based on DFFs and XOR
gate(s). A typical weakness is that the chain of DFFs is to short, causing
a relatively high rate of cycling, which hearable as a beating. However, for
I have a colleague who's using the Systron-Donner MMQ IMU/GPS unit, and
he's wondering if there's a way to get integer seconds out of it. It
uses a Jupiter Pico GPS, I believe, and one of the messages provides
Seconds of Week GPS time, as well as UTC seconds and UTC day, month, year.
So
On 2/6/15 1:21 AM, Javier Serrano wrote:
Dear all,
We would like to start working on holdover performance for White
Rabbit [1]. This is a new domain for us. Our main use case is a WR
switch losing its reference because someone disconnects a fiber. We
can have redundancy, but it will take some
On 2/4/15 3:55 PM, Mark Sims wrote:
I have seen several issues with Windows programs not releasing (or perhaps not
being able to releaase) the serial ports after using them. Once one of these
programs accesses the serial port, no other programs can use it until you
re-boot. I'm fighting
On 1/25/15 1:30 PM, WarrenS via time-nuts wrote:
I second Poul-Henning Kamp's comments concerning D-terms,
(mostly) as done in the TBolt and likely other GPSDOs.
Bear in mind that a PID loop is basically a fairly simple control loop
that is easily susceptible to linear analysis.
They're
On 1/26/15 5:55 AM, Poul-Henning Kamp wrote:
In message 54c5a270.7090...@earthlink.net, Jim Lux writes:
And there's decades, if not centuries, of experience with P, PI and PID
controllers in a practical sense.
Not quite a century I belive: Only the advent of electronics formalized
On 1/17/15 6:59 PM, Ivan.Cousins wrote:
time-nuts members:
What are some signal generators for ATE test?
Requirements:
100MHz to =10GHz (higher would be better)
Settling time less than 1mS
Reasonable phase noise
Cost, less than mortgaging a house.:)
1ms settling time is fairly fast.
On 1/16/15 4:58 AM, Li Ang wrote:
Hi
I have a question about the GPS antenna. Since the GPS signal strength on
the ground is about 20db lower than the thermal noise, does the gain of
antenna matter?
Not a whole lot.. Obviously, you don't want something -10dBi, and there
is a direct effect
On 1/13/15 2:41 AM, Attila Kinali wrote:
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell gmaxw...@gmail.com wrote:
One exception here is space qualified oscillators. For those you
go to the JPL and ask them to help you.
Actually, you want to go to Applied Physics Labs (APL).. they're the
On 1/12/15 1:00 PM, Tom Van Baak wrote:
Yes, you can get an Arduino R3 on eBay for $4 with shipping...
The GPIB connector will cost you more!
Didier KO4BB
A sandwich of two PCB is about the same thickness as the center plug of a GPIB
male connector. So layout 2x12 pads to match the pins and
On 1/11/15 7:30 AM, Martin A Flynn wrote:
I am looking for a GMT/GET mission time clock that has the following
characteristics:
* Reads T minus prior to launch or deployment, T plus after.
* Second display for GMT.
* Simulating it on a PC display would be OK, would prefer an LED/LCD
On 1/9/15 4:57 PM, Henry Hallam wrote:
Such slewing solutions are OK for Google. They wouldn't work well for
one of the systems I work with, which uses system time to calculate
the position of a LEO satellite for purpose of pointing a 7.6 meter
X-band dish. Half a second of error corresponds
On 1/10/15 1:25 PM, Hal Murray wrote:
jim...@earthlink.net said:
Which is why we use TAI in the space business and don't fool with this
Greenwich Mean Time or Coordinated Universal Time which is
discontinuous and potentially non-monotonic.
Does the system clock on your PCs run on TAI or do
On 1/10/15 3:08 PM, Hal Murray wrote:
hol...@hotmail.com said:
Basically the solenoid nudged the pendulum
There was an article in Scientific American many years ago. They used a
magnet mounted on the end of a stick attached to the pendulum arm. The arc
of the magnet swung through a hole in
On 1/9/15 7:42 AM, steph.rey wrote:
Hi Bob,
Many thanks for your prompt and detailled answer.
My question on applications wasn't on good ADEV where I perfetcly
understand the need, but actually what could be the applications of
measuring BAD ADEV (10e-7). That was my point asking what king of
On 12/17/14, 4:36 AM, Bob Camp wrote:
HI
On Dec 17, 2014, at 1:07 AM, Chuck Harris cfhar...@erols.com wrote:
I would venture that the extent of the magic was to note the physical
center of the array, and call that the phase center.
As long as you always orient the antenna in the same
On 12/17/14, 5:20 AM, Dan Kemppainen wrote:
Not sure if this is quite the right platform, but for someone wanting to
experiment it may be worth a look...
https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver
http://www.swiftnav.com/piksi.html
from that page:
3-bit, 16.368
On 12/17/14, 6:46 AM, Chuck Forsberg WA7KGX wrote:
Seems to me CFLs and other loads switching on and off would affect the
60 Hz waveform
enough to make microsecond measurements meaningless.
folks measure the frequency to tenths of a Hz (albeit not a single cycle)..
0.1 Hz out of 60 Hz is 27
On 12/15/14, 8:10 PM, Tom Van Baak wrote:
But to prove us wrong, put the antenna on a 17 hour turn-table, collect data
for 6 months, and then see if you see any 17h peaks in the FFT!
Clever idea, but..
Most rotary joints have more phase and amplitude variability than the
antenna.
So
On 12/16/14, 5:59 AM, Tom Van Baak wrote:
Clever idea, but..
Most rotary joints have more phase and amplitude variability than
the antenna.
So you're stuck with rotating back and forth with a cable that's
flexing and now you get to measure the phase variability of the
coax.
I was thinking of
On 12/16/14, 3:36 PM, Magnus Danielson wrote:
Paul,
That is indeed the question. Considering that the signal is better
supported, I hope the light goes on somewhere. The signals is all
1,023 Mchips/s, just a thad different. Should be possible to pull off if
people want to do dual frequency
On 12/16/14, 4:06 PM, Bob Camp wrote:
Hi
On Dec 16, 2014, at 7:01 PM, Jim Lux jim...@earthlink.net wrote:
On 12/16/14, 3:36 PM, Magnus Danielson wrote:
Paul,
That is indeed the question. Considering that the signal is better
supported, I hope the light goes on somewhere. The signals is all
On 12/16/14, 4:29 PM, Magnus Danielson wrote:
Jim, Bob,
On 12/17/2014 01:06 AM, Bob Camp wrote:
Hi
On Dec 16, 2014, at 7:01 PM, Jim Lux jim...@earthlink.net wrote:
On 12/16/14, 3:36 PM, Magnus Danielson wrote:
Paul,
That is indeed the question. Considering that the signal is better
On 12/15/14, 5:35 PM, Bob Camp wrote:
Hi
On Dec 15, 2014, at 8:29 PM, Paul tic-...@bodosom.net wrote:
On Mon, Dec 15, 2014 at 6:39 PM, Angus not.ag...@btinternet.com wrote:
But is it the closest to the 'true' position that you really want, or
the best estimate of where the particular GPS
On 12/15/14, 5:46 PM, Dave M wrote:
With all the discussion about surveys position accuracy, I have a question
about my choke ring antenna. There is an arrow marked N on the underside
of the rings. How accurately does the alignment need to be to North?
True north or magnetic north (my
On 12/15/14, 6:46 PM, Paul wrote:
On Mon, Dec 15, 2014 at 9:01 PM, Jim Lux jim...@earthlink.net wrote:
if you've got observables and they're in RINEX format, you can do offline
processing through JPL's GIPSY thing..
According to the upload form APPS still requires dual frequency
On 9/28/14, 7:55 AM, Richard Karlquist wrote:
I find it odd that an instrument that probably cost $50,000 when new did
not have a TCXO as standard, and perhaps an oven as an option.
But I think HP did this sort of thing a lot. Something that would have
cost
very little to add, became an
On 12/14/14, 10:41 AM, paul swed wrote:
Well with zero effort the spec sheet. Bob indeed there are common mode
chokes in them. Jeeze a lot in 1 package along with center taps.
Regards
Paul
WB8TSL
I've seen a lot of MiniCircuits BNC 10.7 MHz BPFs used in equipment
racks over the years as a
OCXO
is about $100.00
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On 12/12/14, 5:09 AM, Bob Camp wrote:
———
Are we really that far apart - not really. We each are talking about
two sides of the same coin. The real world is a messy place. Analysis
often takes a back seat to the “fun of doing something”. That’s not
to say it should though …
And sometimes,
On 12/10/14, 9:45 PM, Mike Cook wrote:
Le 11 déc. 2014 à 05:47, Brian Lloyd br...@lloyd.aero a écrit :
On Wed, Dec 10, 2014 at 10:15 PM, Chris Albertson
albertson.ch...@gmail.com
wrote:
Those sub 1 u-second numbers are very good. They argue for using
the BBB as an NTP server but I wonder
On 12/11/14, 6:14 AM, Brian Lloyd wrote:
On Thursday, December 11, 2014, Jim Lux jim...@earthlink.net wrote:
Ah, but will the exact same single board computer be available for
replacement in 5 years?
Most likely not. These days I can't imagine a manufacturer making the same
SBC or mobo
On 12/11/14, 7:04 AM, Paul wrote:
On Thu, Dec 11, 2014 at 9:45 AM, Chris Albertson albertson.ch...@gmail.com
wrote:
Your logic would disqualify EVERY computer made today. What will still be
in production in 10 years?
The ones you make yourself. Or if you're a nation-state the ones you
On 12/11/14, 7:35 AM, Paul wrote:
On Thu, Dec 11, 2014 at 9:59 AM, Jim Lux jim...@earthlink.net wrote:
Linux isn't a whole lot better. If you have a system you cobbled together
in 2004
In the PPS via GPIO this is an issue and you don't have to go back 10
years. There's been a major change
On 12/11/14, 8:11 AM, Brian Lloyd wrote:
Discussing the lifetime of NTP server hardware is all well and good but
given the thrust of this list, i.e. individual time-nuttery, I don't see it
as being too germane. Few of us have the same problems that Jim Lux has at
JPL.
Actually, I think my
On 12/11/14, 9:54 AM, Brian Lloyd wrote:
On Thu, Dec 11, 2014 at 10:46 AM, Jim Lux jim...@earthlink.net wrote:
Actually, I think my point was that the problems I face at JPL are
essentially identical to the problems we face at home. I'm not in the time
and frequency group (and I don't know
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to file some
reference data
Thanks,
Jim
wb4...@amsat.org
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On 12/10/14, 6:31 AM, Alan Melia wrote:
Hi Dave, as a long time reader (since 1955) and subscriber I remember
the Amateur scientist pages ending in the 1980s. I think the contributer
retired. At around that time I think the many adherents formed the
Society of Amateur Scientists. Though I have
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--Jim Harman
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On 12/8/14, 6:15 AM, Brian Inglis wrote:
On 2014-12-07 16:28, Tim Shoppa wrote:
Would any time-nuts know of radiolocation-type testing going on, on east
coast of US, maybe around Maine? There is a very strong wideband
signal on
1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely
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is able to select the 12 BEST places GPS
satellites that are in view.
This is not a great effect as long as there is enough sky that there are
always some in view.
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On 12/6/14, 6:18 AM, Attila Kinali wrote:
On Sat, 06 Dec 2014 14:47:54 +0100
Magnus Danielson mag...@rubidium.dyndns.org wrote:
Also, GPS L2C and L5 signals is already there.
AFAIK there is no satellite with L5 capabilities in space yet.
Also L2C is still marked as unhealthy.
On 12/5/14, 4:50 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 5 Dec 2014 12:23, Bob Camp kb...@n1k.org wrote:
Shipping across the atlantic has become silly expensive over the last
decade. There are a *lot* of organizations that are behind the curve on
figuring out how to do it
Skip:
I would like one, if you have any left.
How do I pay?
Thanks,
Jim
wb4...@amsat.org
On 12/5/2014 1:00 PM, Skip Withrow wrote:
Hello time-nuts,
Please excuse the blatantly commercial announcement, I generally keep
business matters off the list, but I have some Wenzel oscillators that may
I'm looking for a real short (3-4 slides or a website, really)
description of why the phase noise of a PLL (microwave) looks the way it
does, explaining (in sort of qualitative terms) how the phase noise
transitions from the VCO (outside the loop bandwidth) to the reference
(inside the loop
On 12/4/14, 2:59 PM, Magnus Danielson wrote:
Jim,
On 12/04/2014 08:41 PM, Jim Lux wrote:
I'm looking for a real short (3-4 slides or a website, really)
description of why the phase noise of a PLL (microwave) looks the way it
does, explaining (in sort of qualitative terms) how the phase noise
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