Here's an interesting problem.
You have a fast sampler that is collecting samples off-the-air (e.g. the
end of LORAN) with a fairly wide bandwidth: say 10 Megasamples per second.
Those samples get post processed in a digital downconverter (not
necessarily in real time) to a narrower band
On 12/14/15 9:12 PM, ed breya wrote:
This may be totally ridiculous, but maybe there's another way to get a
balance wheel signal. The X-band Doppler type microwave motion detectors
can pick up various object signals in free air from quite a distance, so
maybe up close there would be enough
Yes I've been through the process in the service manual with an
oscilloscope and the part number of the Schmitt trigger (apologies for the
auto-corrected spelling above) is TL072CP.
What I'm after is any "gotchas" or hints before I head down this path.
Jim Palfreyman
On 13 December
Oops yes! I looked up the wrong item. I meant A3U1 which is 5088-7061
Jim
On Sunday, 13 December 2015, Cok <electron...@jpkoning.nl> wrote:
> According to the partlist A4U1 and A4U2 seems to be TL072CP opamps.
>
>>
>> jim77...@gmail.com said:
>>
>>>
, removing the front
panel, removing board A4, desoldering, and reassembling.
Before I dive into this, does anyone have any advice? Most important being
the Schmidt trigger - where do I get one?
Regards,
Jim Palfreyman
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(ADEV of 4E-16 at tau of 1000 seconds is a typical state of the art requirement)
…. and has been since the 1970’s when I first started talking with JPL people
about this :)….
They've gotten a lot smaller and probably draw less power since then.
There's also the testing problem: proving
Turns out there have really just been two major issues so far with this
new-to-me instrument. As I noted a few days back the pots on the A3
multiplier were intermittent, and twiddling them a bit got the instrument
to lock up.
But it was off by about 77E-10. The mag field control had no effect.
On 12/8/15 3:31 PM, Bob Camp wrote:
Hi
Let’s see:
EFC uses reference out of the OCXO.
EFC comes on the OCXO at no added cost.
16 bit DAC costs ~$2 to $5
Total cost for EFC setup $2 to $5. Net result is a system with
spurs that are how ever far down you wish them to be. (It’s all
about
On 12/9/15 4:37 AM, Bob Camp wrote:
Hi
On Dec 8, 2015, at 11:20 PM, Jim Lux <jim...@earthlink.net> wrote:
On 12/8/15 3:31 PM, Bob Camp wrote:
Hi
Let’s see:
EFC uses reference out of the OCXO.
EFC comes on the OCXO at no added cost.
16 bit DAC costs ~$2 to $5
Total cost for EFC se
? Or a clue as
to what's wrong?
I usually see nothing at A7 TP1, but if I tap on the RVFR I get bursts of
noise. Other components are somewhat microphonic too, but the RVFR seems
to be the most sensitive.
On Mon, Dec 7, 2015 at 12:21 PM, Jim/Anna McIntyre <bbim...@gmail.com>
wrote:
&g
e-nuts] (no subject) - HP 5065A
To: Discussion of precise time and frequency measurement <time-nuts@febo.com
>
Jim
Yes the A7 is sensitive. I actually injected 137 and 274 into it and as I
recall the signal was very small to get large readings. Sorry do not recall
the level.
So if the tail
On 12/8/15 8:32 AM, Attila Kinali wrote:
Moin,
I've been digging through some stuff and stumbled (again) over Rick's
paper on high resolution, low noise DDS generation[1] and got confused.
The scheme is very simple and looks like to be quite easy and reliably
to implement. If I understood it
Paul,
I have a 350 MHz scope, HP5335A, various power supplies, DVMs, and sig gens
up to 1 GHz. No working Spec An on my bench now, but I have access to one
if needed...
Jim
-- Forwarded message --
From: paul swed <paulsw...@gmail.com>
Date: Tue, Dec 8, 2015 at 1:35 PM
S
that says option
H52. What is that?
Thanks to all for your support and emails.
-- Forwarded message --
From: Jim/Anna McIntyre <bbim...@gmail.com>
Date: Tue, Dec 8, 2015 at 4:23 PM
Subject: Fwd: 5065 ?? direct
To: Discussion of precise time and frequency measurement <
Thanks for adding the subject in. I'm not used to this format, and
forgot...
Sadly, no clock. It does have a battery, and luckily it hasn't leaked.
I've already received a few emails with some tips, and will post an update
soon.
Thanks again,
Jim
On Mon, Dec 7, 2015 at 9:26 AM, J. L
I just /happened/ to be in Home Depot this morning, and observed that
they have a complete kit -- connectors and tool for something like $30.
It was in the electrical tools area, if this is any help.
Jim
wb4...@amsat.org
//
On 12/6/2015 9:25 AM, Arnold Tibus wrote:
Hi Bob,
you are correct
Greetings all,
My name is Jim, I'm a Noob to your list. A local DoD contractor unloaded a
heap of test equipment lately, and I scored a 5065A. It's s/n 1532A00666,
has an Olive green-ish RVFR, and a 00105-6103, series 1284 Quartz
oscillator.
I have had the instrument powered up for about
On 12/5/15 12:28 PM, Bert Kehren via time-nuts wrote:
At my new home the GPS antenna location has turned in to a challenge. May
have to splice RG 6U. Has any one done measurements on couplings and the
loss associated with them. Right now I am considering a female, female
coupling. Is there a
), but this 0.7ns figure is niggling me.
Has anyone here ever seen such a thing before?
Jim
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On 12/1/15 6:41 PM, Bob Camp wrote:
Hi
So back to the question …. does a 70 (ish) MHz fancy filter really buy you
anything ahead of the main box? If you will be multiply band limited ahead
of the mixer (antenna and saw), the contribution of the 70 MHz filter will
likely be minimal. Note that
On 11/29/15 12:13 PM, Mark Sims wrote:
Another thing to consider is the gravity anomaly caused by that hunk of granite
beneath your clock (or above it in a mine). Hmmm, what is the clock shift at
the top of Mt Everest that is due to the mountain and not the altitude?
.
If anybody would want to make a go of this thing or use it for parts,
please contact me off list.
Jim
wb4...@amsat.org
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On 11/21/15 2:43 AM, Attila Kinali wrote:
On Fri, 20 Nov 2015 15:47:27 -0800 Jim Lux <jim...@earthlink.net>
wrote:
While this is trivial with a GPS receiver, we were thinking about a
very minimalist implementation, with a smart phone as the control
interface.
So, some elect
A couple of us were kicking around the idea of a low cost JT65-like HF
modem implementation, which requires that the station be synchronized to
1 second.
While this is trivial with a GPS receiver, we were thinking about a very
minimalist implementation, with a smart phone as the control
On 11/11/15 3:26 PM, Rob Sherwood. wrote:
The EE department at the University of Colorado has an enlightened professor.
http://ecee.colorado.edu/faculty/popovic.html
Zoya required her students to not only get a ham license, but to build a Norcal
40A.
oks. Most of
the EE students end up with a FPGA board and a DSP board too.
Analog/RF is rare, computer hardware/software skills are common.
Jim,
n8qoh
On November 11, 2015 6:26:19 PM EST, "Rob Sherwood." <r...@nc0b.com> wrote:
>The EE department at the University of Colorado
On 10/31/15 7:32 PM, Bob Camp wrote:
Hi
So … how good is the “calibrate and go” (not the tone on second channel)
approach likely to be?
If it’s a bare crystal or normal XO (not a TCXO) that is supplying the clock,
the crystal will follow some
fairly well known curves. Which one of the curves
On 10/31/15 3:50 AM, Chris Wilson wrote:
31/10/2015 10:46
I have a Racal counter locked to 1 MHz on its rear panel external
input socket from my Trimble Thunderbolt GPS. I derive the 1 Mhz
from a David Partridge divider board. If I also feed the counter
with the 10 Mhz
On 10/28/15 7:48 PM, Jim Lux wrote:
On 10/28/15 7:23 AM, Peter Reilley wrote:
I have been pondering pendulum clocks. I was wondering what the ADEV
of a
pendulum would show. I assume that you could see the errors in the
gear train.
You should see the period of each gear. You should see
On 10/28/15 4:29 PM, Adrian wrote:
That's chapter 6 of his book.
http://rubiola.org/indexx-oscillator-noise.html
Just scroll down for the phase noise plots.
The left hand column of plots contains the essentials.
Adrian
what would be nice is some similar simple analysis for lower performing
On 10/28/15 7:23 AM, Peter Reilley wrote:
I have been pondering pendulum clocks. I was wondering what the ADEV of a
pendulum would show. I assume that you could see the errors in the
gear train.
You should see the period of each gear. You should see the spring wind
down
and being rewound.
o pre-pay, saving a few cents/gal and a
trip inside to get my change. Surprisingly accurate.
--
--Jim Harman
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On 10/26/15 7:06 PM, Brooke Clarke wrote:
Hi:
I understand 10.230 MHz since when multiplied it gives 1176.45,1227.60,
1381.05 & 1575.42 MHz, all GPS carrier frequencies.
http://www.prc68.com/I/DAGR.shtml#GPSs
But I've got a number of GPS receivers that have Rakon unit oscillators
with a
On 10/25/15 9:37 AM, jim s wrote:
Somewhat time related. The Navy realizes that GPS might not always
work. I don't imagine that aircraft in the US Air Force will be able to
do this very reliably, and the article doesn't mention that service. I'm
guessing that a lot of strategic Air Force
that will work some of the time w/o GPS (at night).
http://www.latimes.com/nation/la-na-celestial-navigation-20151025-story.html
Thanks
Jim
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On 10/19/15 7:10 AM, Stéphane Rey wrote:
Hello,
I'm looking for a 10 MHz output GPSDO with external antenna which would
be rackable. Symmetricon doesn't seem to propose some neither Keysight.
MicroSemi now has the product line.. They've got tons of rack mounted
GPS disciplined stuff.
We have
On 10/17/15 6:17 AM, Alex Pummer wrote:
actually, that is a ketch 22, if the loop bandwidth is to low, you will
have low noise , but it may will not lock at all, an other way to try to
filter out the noise, also you may make the loop filter digital, but
leave the the PLL analog, that could have
On 10/16/15 7:45 AM, Martyn Smith wrote:
Hello,
I want to design a digital phase lock loop.
I intend to lock a 10 MHz ultra low noise oscillator that we make to an
external frequency standard.
I need a digital PLL as I’m trying to get a loop bandwidth < 0.1 Hz.
are you locking the
ervice goes back further than the turn of the 20th
> century. It started in 1870.
>
> --
--Jim Harman
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luck!
Jim
wb4...@amsast.org
On 10/11/2015 9:05 AM, Bob Camp wrote:
Hi
Unless you live in an unusual location, long term power outages are going to be
pretty
rare. At the house I’m now in, we had a high voltage feed that was on it’s last
legs. We
had short outages on a “many times a week
thing I left out of my earlier post: ANYTHING I care about is on a UPS.
Good luck!
Jim
On 10/11/2015 12:24 PM, Bob Camp wrote:
Hi
If your problem is transients, from lousy power companies or from lighting on
your power line, there are ways to address that.
High voltage at the service line
line filtering,reduced the
interference significantly.
--
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communications. Based on rough measurements, I
don't think much of a problem at 1 GHz.
Good luck!
Jim
wb4...@amsat.org
On 10/10/2015 2:32 PM, Esa Heikkinen wrote:
Chris Waldrup kirjoitti:
I have decided I'd like to get a UPS to put on the rack containing my
Thunderbolt, the laptop that runs
On 10/7/15 1:16 AM, Tom Van Baak wrote:
Stu,
Thanks for the heads up. If you can leak anything from the upcoming paper
please let us know.
Since you're an Iridium expert, would you be able to answer the question? The
OP (John Todd) was asking about reception deep indoors, where GPS signals
On 10/6/15 5:46 AM, Can Altineller wrote:
Hello Jim,
Yes i need a VCXO or even a VCTCXO. However when I search them on ebay,
unfortunately, since they included every term for XO, I am lost in the
noise.
Any recomendations for buying VCXO's that are surplus, and not ebay?
do you want
On 10/6/15 12:46 PM, Can Altineller wrote:
Hello,
I was hoping for a cheap VCXO. I think those ovenized ones are more
expensive.
Where would I get a brand new VCXO, that has < 1ppm, and specs that are
true. (as in the declared spec would match the actual performance, these
days when we buy
were trying
to get people to do the wrong thing.
thanks
Jim
On 10/2/2015 10:36 AM, Roy Phillips wrote:
For we Europeans, British in my case, the Symmetricom GPS antennas are very
good buy – but the addition of US $60.00 for the shipping makes them rather
expensive ! – plus taxes .
gt; locks a 10MHz signal to a 1Hz (1pps) signal. What makes it lock to 10
> 000 000Hz instead of 999 999Hz or 10 000 001Hz? Just the hope that the
> 10MHz is exactly that?
>
> Cheers,
> Will
>
> On 26/09/15 08:32, Jim Harman wrote:
> > To further demon
tor has been
powered off for 15 minutes, it meets these criteria in less than 10 minutes
after power-up. The spec for the oscillator is that
--
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by an Adafruit GPS module. Presumably it would be less if I had a real
timing receiver.
.
If the inserted image does not come through, I will re-send as an
attachment.
>
> --
--Jim Harman
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ecause I might
> have overlooked something major, that will screw up the operation.
>
> Best Regards,
> Can
>
>
>
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On 9/24/15 11:02 AM, Hal Murray wrote:
xne...@luna.dyndns.dk said:
External Oscillator (the system clock clock) , or External Timer clock
(limited to system clock/4)
That sounds like they are running the external signal through a synchronizer
and then doing all the logic on the system
Got the Rb hooked up.
1E-8, 1E-9 kind of AVAR (after linear trend removal) for 10 minute run.
next, we'll try running it clocked at 96 MHz
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On 9/23/15 2:50 PM, Magnus Danielson wrote:
Jim,
There is some systematic bumps in there which make me wonder what
happens here. Care to share data/plots for phase?
Sure..
This is just the part sitting on my desk with the source hooked up with
clip leads. The run is very short (5-10 minutes
On Thu, Sep 24, 2015 at 10:14 AM, Jim Harman <j99har...@gmail.com> wrote:
> The diode prevents it from being discharged by the LS4046.
Sorry, I meant HC4046.
--
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On 9/24/15 7:13 AM, cfo wrote:
On Thu, 24 Sep 2015 05:30:35 -0700, Jim Lux wrote:
What would be interesting is if there's a pin on the Arduino/Teensy that
you could feed a high quality oscillator to, and then do counting with
that. The K20 microcontroller has a mindbendingly large number
I've got a teensy3.1 hooked up to a 33120 function generator (not
exactly a super stable device) and generating period data for a 1 Hz
square wave.
The period is in "ticks" of the 48 MHz clock, so my thinking is that if
I hook up a good 1pps, what I'm really measuring is the frequency of the
a bit more than 5 minutes of data.
Now to go get a real 1pps source that's decent.
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On 9/21/15 12:13 PM, Robert LaJeunesse wrote:
The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer
Module that appears to allow a single counter to be captured into independent
registers from independent inputs. Not sure, but PJRC tends to run the clock
fast (96MHz)
On 9/21/15 12:13 PM, Robert LaJeunesse wrote:
The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer
Module that appears to allow a single counter to be captured into independent
registers from independent inputs. Not sure, but PJRC tends to run the clock
fast (96MHz)
On 9/21/15 12:13 PM, Robert LaJeunesse wrote:
The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer
Module that appears to allow a single counter to be captured into independent
registers from independent inputs. Not sure, but PJRC tends to run the clock
fast (96MHz)
febo.com
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Just ordered Ethernet to GPIB from Prologix.biz for $199. They also
have a USB version, which a good friend has and recommends. (Which is
why I bought the ethernet device.)
Can you share info on labview home and your apps?
Jim
wb4...@amsat.org
On 9/10/2015 5:58 PM, Brooke Clarke wrote
On 8/29/15 7:19 PM, Alex Pummer wrote:
Hi Bob,
go to your local city library get membership[ here in California it is
free] , and ask them to get from the university library, it will take
some time than they cal you the your stuff is there, you could have it
for four weeks if you need you
On 8/27/15 4:46 PM, Bob Camp wrote:
Hi
On Aug 27, 2015, at 3:58 AM, Hal Murray hmur...@megapathdsl.net wrote:
kb...@n1k.org said:
Is there anything fundamental about SC that forces the turn over
temperature
to be high?
Simple answer yes. More complicated answer : that depends.
The
Someone was asking about changing cut angles and the effect. You might
find some useful stuff in Mark Haney's thesis Design Technique for
Analog Temperature Compensation of Crystal Oscillators
http://scholar.lib.vt.edu/theses/available/etd-11262001-111453/unrestricted/etd.pdf
Here's a matlab
On 8/26/15 4:46 PM, Alex Pummer wrote:
But if he needs 100dBc at 10Hz that is Wenzel's stronghold
[https://twitter.com/ultralownoise]
look that: http://www.wenzel.com/wp-content/parts/501-04517.pdf
Yep.. got one of those sitting on my desk (or one that's very similar)..
but it's a 2x2 block
For a project at work, I'm looking for a good close in phase noise
oscillator (better than -100dBc@ 10Hz, -120dBc would be nice) at 100 MHz
in a SMT form factor. But it doesn't need good temperature stability.
There's tons of SMT OCXOs out there with reasonably good performance,
but they draw
On 8/26/15 1:28 PM, steve heidmann via time-nuts wrote:
Rakon has always impressed me .
I'll take a look. The online datasheets don't have phase noise data for
close in frequencies (at least the 3 I looked at).. some give a
integrated jitter but it's for 12kHz and out, and I've noticed
On 8/26/15 2:38 PM, Gerhard Hoffmann wrote:
Am 26.08.2015 um 22:04 schrieb Javier Herrero:
I suppose that one of the alternatives that you've explored are the
ABLNO from Abracon http://www.abracon.com/Precisiontiming/ABLNO.pdf
looks just like this one from Crystek:
On 8/26/15 1:04 PM, Javier Herrero wrote:
Hello, Jim,
I suppose that one of the alternatives that you've explored are the
ABLNO from Abracon http://www.abracon.com/Precisiontiming/ABLNO.pdf
They say that they are 3rd overtone, but it seems more an AT-cut than a
SC, and anyway is around 10dB
On 8/19/15 10:12 PM, Hal Murray wrote:
t...@radio.sent.com said:
I think that Menlo Park is somewhat under 300 NM (nautical miles) from China
Lake (depending on exactly where the test was located), and the expected
interference range was about 252 NM. So you might have been at the edge of
the
On 8/18/15 10:30 PM, Bruce Griffiths wrote:
The ratio of the resonant frequency of the evacuated cavity to that
of the air filled cavity increases by the square root of the relative
permittivity of the ambient air or around 300ppm or so. Bruce
I believe that there are systems that measure
line at the bottom is the value being sent to the DAC and the
green line at the top is the ambient temperature
--Jim Harman
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On 8/11/15 5:20 AM, David C. Partridge wrote:
I just installed Windows 10 (yes I know how rash), and now my Thunderbolt is
being detected as a Microsoft Serial Ballpoint Mouse (yes, just like before
inder Windows 7). I had set something up on Windows 7 in the boot.ini to
stop this, but for the
On 8/9/15 4:33 PM, Bob Camp wrote:
Hi
If you never have tried to keep an IC in production, there are some basic things
that may not be very obvious:
snip
There's always Rochester Electronics.. leaders in the trailing edge
(no kidding, that's their slogan)..
They buy old fabs, masks, etc,
On 8/9/15 7:57 PM, John Allen wrote:
Hi Jim -
You wrote:
At some point, multiproject wafers (like MOSIS) might become a hobby
product. So far, it's in the several kilobuck minimum purchase, and,
as well, the tools aren't easy to come by. Or, more properly, good
design tools are expensive
On 8/7/15 1:40 AM, Hal Murray wrote:
kb...@n1k.org said:
Well, at least *some* of the chips out there do not make it to 96 KHz when
sampling at 192 KHz. It’s been a few years since I dug into them. Back then
a chip that had an internal filter that went to 96K was very much the
exception
On 8/5/15 8:27 PM, Donald wrote:
On 8/5/2015 7:55 PM, Bob Camp wrote:
Hi
Analog Devices has some very nice ADC’s that are directly targeted at
doing this general sort of thing. They do not have any “odd” filtering
approach
that creates issues. Some of the early 192 KHz audio parts did not do
On 8/5/15 8:03 PM, Donald wrote:
On 8/5/2015 6:44 PM, Jim Lux wrote:
I'm not sure it would buy you much.. you'd have something running at
240kHz switching the inputs to the detector?
It's MUCH easier to just digitize the 60kHz with a high resolution
converter. And have a nice BPF in front
On 8/5/15 12:41 PM, Donald wrote:
On 8/4/2015 9:36 PM, Hal Murray wrote:
kb...@n1k.org said:
So far there have not been any home brew design radios show up that will
demodulate and lock to the new data format. There is plenty of info
on the
transmit format. The demodulation approach is not
for this unit.
thanks
Jim
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The whole USO is about $1M, the vast majority of which is labor.
Analysis, testing, paperwork, etc
Jim
Original message
From: Bob Camp kb...@n1k.org
Date: 07/18/2015 02:10 (GMT+00:00)
To: tim...@timeok.it, Discussion of precise time and frequency measurement
time
On 7/16/15 8:17 AM, John Stuart wrote:
Here is an interesting link to the New Horizons Mission to Pluto radio
system design.
Note last section describes an OCXO with ADEV = 1E-13 at 1s, and aging rate
of 1E-11 per day.
That's no ordinary OCXO. That's a USO made at APL. The crystal is in a
On 7/10/15 6:23 AM, Azelio Boriani wrote:
From http://www.gps.gov/systems/gps/space/
Block IIA: 3 operational
Block IIR and IIR(M): 19 operational
Block IIF: 9 operational
so they should be 31 satellites working.
Plus various and sundry WAAS and similar signals?
On 7/7/15 9:59 PM, Brian Inglis wrote:
On 2015-07-04 07:13, Jim Lux wrote:
I've got a project I'm working on to make a sophisticated sundial with
moving mirrors. I've got a batch of Arduinos that move the mirrors to
the appropriate places, given the current sun angle, etc.
I've got
On 7/7/15 6:28 AM, Attila Kinali wrote:
Moin,
As we need a need a proper TIC here to do our research, we are
going to buy one from ebay form a seller in the US and let a friend
who is in the US at the approriate time and can pick it up to bring
it back in the plane.
Now the big question is,
On 7/6/15 3:19 PM, Tom Harris wrote:
Since you want simple just use a CGI script written in your language of
choice. Very easy technology to learn, Python has support libraries out of
the box if you want. You have a webpge with carious simple controls on it
like buttons etc, you click a special
On 7/4/15 10:25 PM, Brian Inglis wrote:
Thanks for the good and interesting refs.
One of the interesting points was that normal variations are multiples
of those caused by earthquakes, and annual variations are up to 1ms and 1m.
Another was that the jet streams produce large short term
On 7/4/15 7:53 PM, Hal Murray wrote:
jim...@earthlink.net said:
Exactly... I've got an array of mirrors on az/el mounts (two servos
stacked) and the reflection from the mirrors on the wall forms the display.
How many pixels in that display? Or what is the unit of quality measurement?
What
On 7/5/15 8:43 AM, Bob Camp wrote:
Hi
On Jul 5, 2015, at 8:46 AM, Jim Lux jim...@earthlink.net wrote:
On 7/4/15 7:53 PM, Hal Murray wrote:
jim...@earthlink.net said:
Exactly... I've got an array of mirrors on az/el mounts (two servos
stacked) and the reflection from the mirrors on the wall
I've got a project I'm working on to make a sophisticated sundial with
moving mirrors. I've got a batch of Arduinos that move the mirrors to
the appropriate places, given the current sun angle, etc.
I've got a beaglebone that runs some python code to calculate sun angle
based on time
The
On 7/3/15 9:45 PM, Brek Martin wrote:
Hi Guys,
I feel like I missed “The Big Thing” in time keeping land. I should have
watched my Ublox LEA-5T.
What is the difference if it is in the reporting mode for GPS or UTC time?
If they skip a second UTC, surely the GPS time isn’t run incorrectly
On 7/4/15 11:45 AM, Bill Dailey wrote:
Pysolar
Sent from mobile
Pysolar: staring directly at the sun since 2007
excellent.. thanks..
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. That's more of a celestial
mechanics thing. A different group at JPL who do that, but if you email
Richard Gross, he might tell you who does that.
Jim
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On 7/4/15 1:42 PM, Simon Marsh wrote:
Pretty much every webserver ever written allows you to run a script in
response to a request. Nowadays there are frameworks that integrate
closely with the language of your choice and do all the heavy lifting
for you.
If fact, the problem is really too
I should finally de-lurk
since I can perhaps offer some useful opinion on this. Comments inline.
On Sat, Jul 04, 2015 at 06:13:06AM -0700, Jim Lux wrote:
I've got a project I'm working on to make a sophisticated sundial
with moving mirrors. I've got a batch of Arduinos that move the
mirrors
On 7/4/15 12:31 PM, Bob Camp wrote:
Hi
As silly as it sounds, having a separate board for the user i/o is probably the
best way to go.
You already have an empire of devices that (somehow) chat with each other. The
barrier of
“it’s all on one device” has been broken even before i/o has been
On 7/4/15 2:01 PM, Tom Van Baak wrote:
(the Japan earthquake in 2011 sped the earth up by 1.8
microseconds/day. The Sumatra quake on 26 Dec 2004 had a bigger
effect: 6.8 microseconds)
Hi Jim,
Just in case you didn't know -- these are theoretical results only.
There's a guy at JPL (Richard
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