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
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
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
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
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
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
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
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
On 11/30/14, 1:49 PM, Hal Murray wrote:
eb4...@cembreros.jazztel.es said:
Do not trust Google Earth data for any precision work. The mentioned six
feet are probably due to the geographical data, not to the precission of
your GPS unit. If you look for image seams you can verify the kind of
On 11/27/14, 7:07 AM, Tim Shoppa wrote:
For a hobbyist doing things a few at a time, what advantage is there to
buying RF transformers made by Mini-circuits etc., vs winding them using
commonly available ferrite cores/binocular cores?
Probably depends on the frequency ranges and such. The
On 11/27/14, 3:10 PM, Gerhard Hoffmann wrote:
Am 27.11.2014 um 23:30 schrieb Bob Camp:
Hi
Finding the RF transformer parts is still a bit of a challenge.
No. These work quite good for me:
CX2074 4:1 CT
CX2147 1:1 CT
On 11/26/14, 1:37 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
Said mentioned on an earlier thread that if a GPS antenna is used
outside, lightening protection should be used. This immediately
reminded me of something that happened about 10 years ago to me
1) Lightening damaged my ADSL
On 11/26/14, 2:00 PM, Martin A Flynn wrote:
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
polyphaser has it's own #2 ground wire.
On 11/26/14, 2:14 PM, Chris Albertson wrote:
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Start with the antenna mast and call. Use iron pipe for the mast and feed
the antenna cable down the center of the
On 11/26/14, 2:54 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
AWG 6 wire with no breaks or
On 11/26/14, 5:23 PM, Chris Albertson wrote:
On Wed, Nov 26, 2014 at 4:03 PM, Jim Lux jim...@earthlink.net wrote:
On 11/26/14, 2:14 PM, Chris Albertson wrote:
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity
On 11/24/14, 2:20 AM, Graham wrote:
Interesting.
I have also been thinking that it might not be too difficult to
implement using Beaglebone Black, Raspberry PI, or even one or another
flavour of Arduino. Lots of possibilities from simple to not so simple.
The challenge is always trying to
On 11/24/14, 6:05 AM, Mark Kahrs wrote:
For those who are interested, a relevant dissertation can be found here:
http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf
Unfortunately, you can't print it, but you can read it. A rather complete
discussion of the construction of the
Started plotting some sampled data from my experimental system, and
interestingly, it seems to have a 1/f^2 slope, rather than a 1/f slope.
I had expected the amplifier noise to dominate, but perhaps one of the
myriad other noise sources is contributing as well (e.g. sample clock
jitter, ADC
I'm writing a short simulation program to generate samples from a analog
system with some op amps, etc., and I'm wondering if anyone has some
practical experience on picking parameters for the generator.
I'm generating minutes worth of data sampled at 1 kHz, and my opamps
have their
On 11/23/14, 7:21 AM, Magnus Danielson wrote:
Jim,
Find myself providing guidance in both the 2010 and 2013 threads, and
they are still valid starting-points.
For music synthesizer applications, flicker noise have been done, such
as on this schematic:
On 11/23/14, 5:46 PM, Brooke Clarke wrote:
Hi Jim:
It turns out that ground water that's being pumped is very similar to
pumping oil. It's a limited resource.
There's a web page showing the GRACE satellite maps of California and
that we are running out of ground water.
Back east where that
On 11/19/14, 9:17 PM, Magnus Danielson wrote:
Hi Rick,
They did not mention the complexity of the laser system they needed,
especially considering that the optical bench of a fountain isn't all
that small, and also because they want to de-tune lasers. While they
seems to have an idea, they
:00 PM, Jim Lux jim...@earthlink.net wrote:
Interesting parts.. They aren't kidding when they say you need good
power supply bypassing and decoupling.(a comment that is in the 84
book but not the 75 version) I'm trying to remember what I was
using them for: driving a YIG tuning coil in a phase
On 11/19/14, 3:59 PM, Dave Daniel wrote:
I remember the Fast and Damn Fast Buffer Amp data sheet. LH0036? I may
not be remembering the correct part number. I used to have a copy of
that data sheet, as well as another that was labeled DC to Daylight on
the data sheet.
DaveD
On 11/19/2014 2:42
I'm sure someone here has fooled with the Si570.
I just got a few of them (CMOS output), and am about to deadbug one of
them to fool with it (unless there's some convenient protoboard out
there available.. I didn't look too long and hard, but some casual
googling didn't find one).
Looking at
On 11/18/14, 8:04 AM, paul swed wrote:
I just picked up the si5351a and the thing that jumps out at mee is the 228
registers to program.
Granted it lets you create just about any frequency and there is a good
program that tells you what to set the registers to. But 228 registers is a
lot.
The
On 11/18/14, 10:24 AM, Götz Romahn wrote:
Jim,
thre is some info at:
http://www.box73.de/product_info.php?products_id=1869
it's all in German. If you can read that, goto Zusaztinformationen
(additional informations) where you will find a comprehensive articel
(pdf-document) also in German
On 11/18/14, 11:19 AM, Orin Eman wrote:
I have one of these: http://sdr-kits.net/PA0KLT_Description.html
built with the CML output Si570 that goes to 1417 MHz (!)
There is a schematic in the assembly manual that's linked to from that
page. They use 100n and 1n capacitors in parallel on Vdd
On 11/14/14, 4:28 AM, Bob Camp wrote:
Hi
The question kind of is: Is it really supposed to be 60kHz and slightly
off frequency? Or is it deliberately at that frequency because it's a
multiple/submultimple of something useful?
It could easily be a switcher in somebody’s video gear.
On 11/8/14, 6:58 PM, Pete Lancashire wrote:
Is this who you got it from
http://www.css-timemachines.com/
if so, why not contact them ?
http://www.css-design.com/downloads/TM1000A_Manual.pdf
page 9 of the pdf.
___
time-nuts mailing list --
On 11/6/14, 5:08 PM, Scott McGrath wrote:
The only problem with these standards is the tube availability since they have
that neat little rom which allows the standard to recognize the tube.
So using available non-5071 tubes is a challenge unless someone solved the
rom issue
But the first
On 11/3/14, 1:50 PM, Tom Van Baak wrote:
I have a question about that. If I understand correctly, recent IAU
resolutions have decoupled the definition of the SI second from the
terrestrial geoid, which is too fuzzy to be used for a definition. Instead
the geoid potential is held fixed by (or
On 11/2/14, 3:09 PM, Magnus Danielson wrote:
Bob,
Yes, but your Q will suffer.
Yes, I've dug out *aged* papers. I was sad to see that JPLs server was
taken down before I got to download their wealth of papers. Naturally it
happen just after I found out it also had a hydrogen maser section, but
On 11/1/14, 9:08 AM, Magnus Danielson wrote:
Paul,
You mean, as all time-nuts already have redundant sites with at least 4
5071As with high-performance tubes, redundant cesium and rubidium
fointains, set of active hydrogen masers, with everything in tight
temperature, humidity and pressure
On 11/1/14, 11:05 AM, Magnus Danielson wrote:
Jim,
However, if you were happy with lab grade construction, and you have
the Kurt Lesker and Duniway catalogs as bedside reading, I think you'd
have a chance.
Yes. I guess a bit of baking out the build is also to be recommended.
I guess most of
OK, I know you all want to go get one...
http://discoverjpl.jpl.nasa.gov/posts/520
It's Bob Tjoelker in front of the Deep Space Atomic Clock (DSAC) being
tested for magnetic field sensitivity. It's a trapped ion clock, 1
liter/1 kg, orders and orders of magnitude better than a USO in
On 10/31/14, 5:05 PM, Bob Camp wrote:
Hi
Either my mag coil “do it in your head” math is off or that’s a pretty low
field Helmholtz setup. Skinny coils….
Just to cancel earth's field or to simulate maybe Jovian fields.
Or, just to evaluate the sensitivity.
And, of course, it's all about
Some papers by Todd Ely, PI for DSAC..
3E-15 at tau of 86,400 seconds
https://www.researchgate.net/publication/260036335_Expected_Performance_of_the_Deep_Space_Atomic_Clock_Mission
http://trs-new.jpl.nasa.gov/dspace/handle/2014/43016
On 10/31/14, 10:36 AM, Jim Lux wrote:
OK, I know you all
There are a variety of inexpensive wall-wart packaged float chargers for
lead acid batteries around. Might be easier to just get something off
the shelf.
http://www.power-sonic.com/images/powersonic/chargers/AC-Series_12_Aug_15.pdf
On 10/26/14, 10:43 AM, Brian Lloyd wrote:
On Sun, Oct 26, 2014 at 10:29 AM, Jim Lux jim...@earthlink.net wrote:
There are a variety of inexpensive wall-wart packaged float chargers for
lead acid batteries around. Might be easier to just get something off the
shelf.
http://www.power-sonic.com
really want to do is stay below the gassing voltage
at 02.54
at 20 2.415
at 40 2.33
The challenge is that the gassing voltage at high temperatures (40-50C)
is within the float charge range at low temperatures.
Regards,
Tom
- Original Message - From: Jim Lux jim...@earthlink.net
On 10/23/14, 9:14 PM, John Allen wrote:
Hi Rick - I believe it was CompuServe (which AOL later bought.) It didn't
really cause any trouble...
Regards, John K1AE
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Richard (Rick)
Karlquist
Sent:
On 10/22/14, 1:57 PM, Scott Newell wrote:
At 03:43 PM 10/22/2014, Dave M wrote:
Content-Transfer-Encoding: 7bit
I contacted one of the MTI Milliren marketing guys a few days ago, and
got
some specs on the MTI model 260-0624C and 260-0544C OXCOs that are
currently
Be careful. I bought a
On 10/22/14, 6:28 PM, Dave M wrote:
Scott Newell wrote:
At 03:43 PM 10/22/2014, Dave M wrote:
Content-Transfer-Encoding: 7bit
I contacted one of the MTI Milliren marketing guys a few days ago,
and got some specs on the MTI model 260-0624C and 260-0544C OXCOs
that are currently
Be careful. I
http://www.petermann-technik.com/products/rtc/ptrtc1010/
http://www.edn.com/electronics-products/other/4435988/Low-cost-real-time-clock-IC-offers-precise-timing
...Temperature stability is ±5 ppm within the -40°C to +85°C range,
which enables a highly accurate absolute time offset of 15
On 10/19/14, 1:08 PM, Bob Camp wrote:
Hi
On Oct 19, 2014, at 3:35 PM, Charles Steinmetz
csteinm...@yandex.com wrote:
Bob wrote (alluding also to something Poul-Henning wrote):
The phase comparison part of the PLL is pretty straightforward if
you are looking at two RF frequencies. An XOR
Maybe it's a which address range you are in or some sort of confusion
in the filter algorithm.
I get blocked from sites at MIT from JPL at work all the time (usually
when trying to get at someones dissertation or presentation slides).
Generally, at JPL we have a soft block. you get a message
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