I have wondered the same thing.
Doc
KX0O
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On Wed, 25 Apr 2012 02:01:36 + (UTC)
Andrew Rodland and...@cleverdomain.org wrote:
Would anyone be willing to sell (or loan for an extended period) one or two
ready-to-go PICTIC IIs within the United States? I realize this may be rude
to ask since it's a hobby project, but what can I say?
I agree, nevertheless let me add: because it is a hobby project it is good
also starting to learn how to use the soldering iron.
On Wed, Apr 25, 2012 at 2:59 PM, Attila Kinali att...@kinali.ch wrote:
On Wed, 25 Apr 2012 02:01:36 + (UTC)
Andrew Rodland and...@cleverdomain.org wrote:
On Wed, 25 Apr 2012 15:24:50 +0200
Azelio Boriani azelio.bori...@screen.it wrote:
I agree, nevertheless let me add: because it is a hobby project it is good
also starting to learn how to use the soldering iron.
But for that, you need someone who shows you how to solder.
You can learn it
Moin,
We've a customer who does sub mm measurements using GPS in alpine
enviroment. This is done using LEA-6T modules, logging of raw phase
data and offline post processing using long averaging windows.
Now, the customer had some problems reaching the precision requirements
and i'm wondering
Yes, better have someone who can help but nothing should prevent you from
learning something.
On Wed, Apr 25, 2012 at 4:44 PM, Attila Kinali att...@kinali.ch wrote:
On Wed, 25 Apr 2012 15:24:50 +0200
Azelio Boriani azelio.bori...@screen.it wrote:
I agree, nevertheless let me add: because it
On 4/25/2012 10:20 AM, Donald Henderickx wrote:
On 4/23/2012 7:27 PM, Dan Veeneman wrote:
Hello,
I've got an HP 570A digital clock on the bench for which I am seeking
both service and operator manuals. Are there PDF versions available
somewhere?
Thanks,
Dan
Ed,
I downloaded that service manual - an interesting read. So much stuff
was well-figured out even back then.
You should look closely at section 4.4.7.1. regarding the presence of
the 2f (310 Hz) signal.
Ed Breya
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You are not going to get anywhere near sub-mm levels without doing L1/L2
measurements with a geodetic grade receiver and thermally stabilized antenna
(and receiver/cable). With a patch antenna (which is in a lot of timing
antenas) on a geodetic L1/L2 receiver you can see 1 meter errors!
On Wed, Apr 25, 2012 at 5:50 AM, Bill Dailey docdai...@gmail.com wrote:
I have wondered the same thing.
It might be time for a group project to design a Pictic III that uses
parts that are readily available. Today I'd build it around an Arduino
rather than a PIC even if the cost is more.
Hi Attila,
On 04/25/2012 04:56 PM, Attila Kinali wrote:
Moin,
We've a customer who does sub mm measurements using GPS in alpine
enviroment. This is done using LEA-6T modules, logging of raw phase
data and offline post processing using long averaging windows.
Now, the customer had some
Chris: I concur. Arduino base would allow simple extension to 'net
control as well.
Don
Chris Albertson
It might be time for a group project to design a Pictic III that uses
parts that are readily available. Today I'd build it around an Arduino
rather than a PIC even if the cost is more.
Hi Attila,
I agree, keep the gps away from such fast and large temperature excursions. The
internal tcxo is not as stable as one would expect.. Building a larger box and
burying it could help slow the temp gradient..
Bye,
Said
Sent From iPhone
On Apr 25, 2012, at 8:52, Magnus Danielson
I forgot to add that a simple redrafting of the II as an Arduino shield
with appropriate chips and chip passives would accomplish the desired
end without losing the very careful engineering and testing that has
already been done?
Would be nice to have a way to change caps without soldering as
Hi
Both the receiver and the antenna have filters in them. The affordable
ones (no need to say cheap) are made from ceramics that have significant
temperature coefficients. If you are getting -40 to +30C jumps, they will
definitely have an impact on the filters phase / delay. That's going to make
On 04/25/2012 06:37 PM, Said Jackson wrote:
Hi Attila,
I agree, keep the gps away from such fast and large temperature excursions. The
internal tcxo is not as stable as one would expect.. Building a larger box and
burying it could help slow the temp gradient..
Indeed. I forgot to say that
Hi Ed,
On 4/25/2012 9:41 AM, ed breya wrote:
Ed,
I downloaded that service manual - an interesting read. So much stuff
was well-figured out even back then.
Yes, the building blocks were all in place and are still used today.
But when you look at some of the implementation details you see
Hi Attila,
Are you sure the customer said sub-mm and not sub-meter? I know
post-processing is really helpful, but the LEA-6 is a single frequency
receiver so all the advantage of L2 is lost for this customer. The
bullet antenna's don't even have an arrow for North ;-)
One thought -- seeing how
I still have a supply of boards and most parts including the 74ac175 but no
interest in assembly or the kitting process. If someone would like to take
this on then I could provide the boards etc ... in bulk. Because of my
limited space the kitting process takes several hours to do them one at
From a friend:
Yes, emphatically! It was established more than twenty years ago, by
theory and experiment, that simple GPS receiving antennas yield position
determinations with errors of many millimeters, and time-synchronization
errors of equivalent magnitude (i.e., many millimeters multiplied
On 4/25/2012 7:44 AM, Attila Kinali wrote:
On Wed, 25 Apr 2012 15:24:50 +0200
Azelio Borianiazelio.bori...@screen.it wrote:
I agree, nevertheless let me add: because it is a hobby project it is good
also starting to learn how to use the soldering iron.
But for that, you need someone who
On Wed, Apr 25, 2012 at 9:37 AM, Don Latham d...@montana.com wrote:
I forgot to add that a simple redrafting of the II as an Arduino shield
with appropriate chips and chip passives would accomplish the desired
end without losing the very careful engineering and testing that has
already been
On Wed, Apr 25, 2012 at 11:09 AM, Randy D. Hunt randy_hunt...@yahoo.comwrote:
Then there is also the matter of surface mount components. Some people my
not physically be able to work with them, learning to solder or not. I am
rapidly joining that group be cause of my vision.
Get yourself a
On 25 April 2012 19:09, Randy D. Hunt randy_hunt...@yahoo.com wrote:
Then there is also the matter of surface mount components. Some people my
not physically be able to work with them, learning to solder or not. I am
rapidly joining that group be cause of my vision.
Since Arduino has been
Moin,
On Wed, 25 Apr 2012 10:05:00 -0700
Tom Van Baak t...@leapsecond.com wrote:
Are you sure the customer said sub-mm and not sub-meter? I know
post-processing is really helpful, but the LEA-6 is a single frequency
receiver so all the advantage of L2 is lost for this customer. The
bullet
Just brainstorming here, but how about this un-conventional approach:
Use a CSAC as a precise frequency reference for the LEA-6T. CSAC should
operate at 0.12W, I know, that's a lot, but maybe just worth a try.
To make the CSAC work, multiply the 10MHz up to the 26MHz the LEA uses.
Then
On Wed, Apr 25, 2012 at 11:39 AM, Andrew Back and...@carrierdetect.comwrote:
On 25 April 2012 19:09, Randy D. Hunt randy_hunt...@yahoo.com wrote:
Then there is also the matter of surface mount components. Some people
my
not physically be able to work with them, learning to solder or not.
Fellow time-nuts,
Oh, ok. So now it is public, so I better tell you about it...
Jörgen Städje is a tech-writer which enjoys writing articles where he
dips into some system and writes about it. Trying to teach things.
Demystify things. So, when you read it, please recall that the audience
is
On Wed, 25 Apr 2012 08:45:52 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
On Wed, Apr 25, 2012 at 5:50 AM, Bill Dailey docdai...@gmail.com wrote:
I have wondered the same thing.
It might be time for a group project to design a Pictic III that uses
parts that are readily
Chris Albertson wrote:
On Wed, Apr 25, 2012 at 9:37 AM, Don Lathamd...@montana.com wrote:
I forgot to add that a simple redrafting of the II as an Arduino shield
with appropriate chips and chip passives would accomplish the desired
end without losing the very careful engineering and
If you guys go the PIC route, I'm always happy to burn them for the
group for cheap. I think in the past I was doing 5 bucks for the
first one (including delivery) plus $2.50 for each additional. I
still have a ton of those plastic chip tubes for mailing them so the
pins don't get bent.
-Bob
On Wed, Apr 25, 2012 at 11:42 AM, Attila Kinali att...@kinali.ch wrote:
Moin,
After installation the system
runs on solar power with a backup battery. But this doesn't guarrantee
power at all. The solar panel could be below a meter or two of snow.
Hence the whole system has to cope with
You should be able to get the power for a OCXO way down with some very good
insulation. Think Dewar container for the XTAL and heater. They just need a
lot of power to get warmed up and you could do that prior to installation.
As to using a choke ring antenna, just use a steep peaked radome.
On Wed, 25 Apr 2012 12:29:59 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
1) You could use a choke ring if you were willing to build a large size
conical cover or (say) fiberglass
I thought about that... customer doesn't seem to like it.
2) Seems that you might want a much taller
Attila Kinali wrote:
Hi Bruce,
On Thu, 26 Apr 2012 07:15:41 +1200
Bruce Griffithsbruce.griffi...@xtra.co.nz wrote:
If a suitable ADC is used the interpolator can be simplified
considerably whilst improving its performance.
Could you tell a little bit more about what a suitable ADC
On Thu, 26 Apr 2012 08:00:17 +1200
Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
If a capacitive input charge redistribution ADC is used the interpolator
output capacitor can be directly connected to it.
This eliminates the output buffer amp with its unknown settling time as
well as the
Very cool, Magnus. Congratulations on your new-found fame!
John
On 4/25/2012 3:06 PM, Magnus Danielson wrote:
Fellow time-nuts,
Oh, ok. So now it is public, so I better tell you about it...
Jörgen Städje is a tech-writer which enjoys writing articles where he
dips into some system and
Hi Magnus,
Don't you just love that Rubidium color! Like nothing else.
With Chrome's translator I was able to follow the article ok.
On the other hand it starts out with:
Is your atomic clock for? Grinds it a little and needs to be
lubricated? Does the atoms on the end? Then it's time to
About replacing the 74ACT175... there´s a company called Potato Semi
(well.. they make chips, right?) whose sole business is to make damn
fast 74 logic. Their chips can be bought at ebay in small quantities.
Look at this 600MHz D flip flop:
On Wed, Apr 25, 2012 at 12:11 PM, Attila Kinali att...@kinali.ch wrote:
On Wed, 25 Apr 2012 08:45:52 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
On Wed, Apr 25, 2012 at 5:50 AM, Bill Dailey docdai...@gmail.com
wrote:
I have wondered the same thing.
It might be time
The portrait of your good self on page 4 A night seance in rubidium lamp
light is superb, I would guess that this is inspired by a LP sleeve. It
looks like it was painted by Joseph Wright of Derby, who lived about 250
years ago and who was the first painter to paint scientific subjects, and
who
Hi Tom,
On 04/25/2012 10:54 PM, Tom Van Baak wrote:
Hi Magnus,
Don't you just love that Rubidium color! Like nothing else.
Rubidium actually has a deep red colour to it, it was found using the
flaming new flame spectroscopy method and is named so from the ruby-red
colour it has. So you
On 04/26/2012 12:37 AM, Tom Harris wrote:
The portrait of your good self on page 4 A night seance in rubidium lamp
light is superb, I would guess that this is inspired by a LP sleeve.
Yes, indeed it is. Now, which LP sleeve is it? We have the age for it here.
It looks like it was painted by
Chris,
Your undying devotion to the Arduino is laudable. However, the point that i
think you are missing is such functionality is also available on other platforms
with the same amount of ease and support. If you take someone who has never
seen, touched nor had any knowledge of any computing
Mmmm not too impressive a web site thoughthe link to the buy page doesnt
work backing up to the home the tabs in light grey on a white background are
almost unreadabletoo must geewhizz and not the right HF input I
suspectstill looks an interesting product.
Alan
G3NYK
- Original
Rasberry pi appears to have fallen victim to poor pre market research.
Essentially vapor for now. Don't know when you can get one. I have been
looking to get one since march. RadioShack carries arduino.
Doc
KX0O
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time-nuts mailing list --
That we even know what an LP sleeve is gives a pretty
good clue about what a bunch of old goats we are ;-)
-Chuck
Magnus Danielson wrote:
On 04/26/2012 12:37 AM, Tom Harris wrote:
The portrait of your good self on page 4 A night seance in rubidium lamp
light is superb, I would guess that this
On Wed, Apr 25, 2012 at 4:24 PM, WB6BNQ wb6...@cox.net wrote:
Chris,
Your undying devotion to the Arduino is laudable. However, the point that
i
think you are missing is such functionality is also available on other
platforms
with the same amount of ease and support. If you take someone
Paul,
Good suggestion, but I don't think pop rivets had been invented when
they built this thing! :-D It's built like a piece of mil-spec
equipment. When I google for individual parts, I keep tripping over NSN
numbers. Now that I look closely at it, I realize that the case is just
the
two thumbs up for Radio Shack - they sure have their problems but they
are all we have in a lot of places. with the new Velleman and Arduino
and Basic Stamp kits, they are clearly trying. they have a ways to go,
but I try to vote with my $$$ a little bit. Cliff K6CLS
On 2012-04-25 16:41,
On Wed, 25 Apr 2012 11:13:42 -0700, Chris Albertson
albertson.ch...@gmail.com wrote:
On Wed, Apr 25, 2012 at 9:37 AM, Don Latham d...@montana.com wrote:
I forgot to add that a simple redrafting of the II as an Arduino shield
with appropriate chips and chip passives would accomplish the desired
On Wed, 25 Apr 2012 21:26:25 +0200, Attila Kinali att...@kinali.ch
wrote:
Hi Bruce,
On Thu, 26 Apr 2012 07:15:41 +1200
Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
If a suitable ADC is used the interpolator can be simplified
considerably whilst improving its performance.
Could you tell
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