Hi
A lot depends on exactly what the interrupt structure is. It may also depend on
the phase of the cpu clock relative to the pps signal. What's reasonably sure
is that there is indeed some offset between the two where the answer is indeed
"ft's" random. Another thing to check - how wide is the
On Fri, 07 Dec 2012 17:50:55 -0500, "Charles P. Steinmetz"
wrote:
>John wrote:
>
>>What's *really* interesting, though, is the idea that collectively
>>we might develop some standard measurement protocols that would be
>>reproducible in a number of (amateur) labs.
>
>I agree, but I didn't dare
One more test to try. Connect one PPS signal to both GPIO ports and see
how close to zero offset you get. It would likely be random which gets
read first.
On Wed, Dec 5, 2012 at 5:37 AM, Gabs Ricalde wrote:
> Hi everyone,
>
> As Tom suggested, I redid the test with less than 1 ft. of wire fr
Hello Bert,
The boards look nice but tell me nothing of the circuitry. How about sending
the schematics ?? That way I
can appreciate what it is that you have.
BillWB6BNQ
p.s. By the way, what ever happen with that DMTD you were going to produce
about three years ago ?
ewkeh...@aol.com
Did do some more reading and I think what I suggest is the right approach.
Band 2 and 3 use the same VCO. So if band 2 is generally working then its
possibly the rf multiplier yig filter mixer diodes etc. But if the RF
detectors show RF then its going to be a much more interesting issue.
I do not k
Yes, GPL is just one of many Open Source license types. Others include
1) GPL (may only be used for other GPL'd projects)
2) "BSD" style (allows use for any purpose, buy you can't sue the author)
3) Public Domain (totally unrestricted use)
4) Various Creative Commons versions some allow comercial
They did respond back and I am limited to 1. Wanted 2 but such is life. :-)
Will order most likely Monday.
Regards
Paul
WB8TSL
On Fri, Dec 7, 2012 at 11:45 AM, paul swed wrote:
> Thanks I will try this out. Pretty darn interesting indeed and at $35.
> Great. Thats my kind O price.
> Regards
> Pa
John wrote:
What's *really* interesting, though, is the idea that collectively
we might develop some standard measurement protocols that would be
reproducible in a number of (amateur) labs.
I agree, but I didn't dare to dream so large when I wrote:
From my perspective, the most interesting
On 12/7/2012 5:26 PM, Scott McGrath wrote:
Well the GPL crowd has kind of conflated open source with code
licensed under the GPL. And yes I have met Richard Stallman on many
occasions. And I'm sure he would also disagree on my definition of
open source
You're confusing the two. Stallman promot
On 11/28/2012 11:52 PM, M. Simon wrote:
I was going to post an anecdote about termination to the list and then thought
that the piece would make a great column. It did. My magazine featured it in
one of its daily mailings.
If you want to check it out: http://www.ecnmag.com/blogs/2012/11/long-l
Well the GPL crowd has kind of conflated open source with code licensed under
the GPL. And yes I have met Richard Stallman on many occasions. And I'm sure
he would also disagree on my definition of open source
Heck under those terms code released under the BSD license does not qualify as
'open
Not by the most commonly accepted definition:
http://opensource.org/docs/osd
The no discrimination clause is interesting. That explains the bizarre
"white power" linux distribution.
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Hi
At least one should compare similar to better than approaches. This is a
multi year design. Pick a goal first, then try to fit a specific approach to
the goal. If the approach makes sense, move on with the design.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-n
On 12/7/2012 4:08 PM, Scott McGrath wrote:
that was my point code is open source means open for inspection by
end-user. The tool chain is irrelevant unless it comes from GPL or
similar licenses. Back in the mainframe days most code was
proprietary but distributed to customer in the form of so
that was my point code is open source means open for inspection by end-user.
The tool chain is irrelevant unless it comes from GPL or similar licenses.
Back in the mainframe days most code was proprietary but distributed to
customer in the form of source code to be compiled by the end user.
On 7 December 2012 15:00, Scott McGrath wrote:>
> What most people think about when they hear about open source is code
> released under variants of the GPL which require that code released to the
> public built with GPL tools be made available for no more than the cost of
> distribution ie yo
Hi Pete:
Try Google Images.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Pete Lancashire wrote:
Has anyone posted pictures of what a dissembled 5061A tube looks like ?
Just curious
-pete
___
time
Hi Pete,
Corby might have some. He's disassembled many Cs tubes. I'll look for my old
photos too. Meanwhile here's a collection of several Cs tubes:
http://www.leapsecond.com/images/cs-cavity-collection-2.jpg
It the main "cavity" through which the Cs atoms fly while getting exposed to
the magic
Has anyone posted pictures of what a dissembled 5061A tube looks like ?
Just curious
-pete
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and follow the instructions there.
Bob
Yes would agree these are the attributes of a solution thats interesting.
Numbers of folks have created solutions over the years. But the
reference architecture should be as good as or better then the tried and
true tool we have like the HP 38XX or Tbolt. Otherwise is just another
GPSDO.
Regard
but we could use a less expensive one. a simple light interruptor senses
the end of flow, a robust servo turns over the hourglass for the next
cycle. our favorite arduino counts seconds from the gps, and adjusts the
turnover appropriately. If magnetite sand is used, an external magnetic
field can p
And then it becomes popular and guess what happens to the price?
Tom
- Original Message -
From: "Bob Camp"
To: "'Discussion of precise time and frequency measurement'"
Sent: Friday, December 07, 2012 12:15 PM
Subject: Re: [time-nuts] GPSDO Alternatives
To "win" the hourglass vs c
Hi
Without some qualifier on "how good", we all will be talking about
hourglasses and cesium standards at the same time. That makes sorting things
out a bit difficult. It may get you into building a "controlled hourglass"
that's less accurate than a free running $10 wrist watch.
So far the only
Jim right on target for my 2 cents,
Simple is often hard.
Regards
Paul
WB8TSL
On Fri, Dec 7, 2012 at 10:12 AM, Jim Lux wrote:
> On 12/6/12 5:01 PM, Bob Camp wrote:
>
>> Hi
>>
>> The solution to the problem is well known in several forms. Cost is below
>> $5 for pretty much all of them. No need t
Thanks I will try this out. Pretty darn interesting indeed and at $35.
Great. Thats my kind O price.
Regards
Paul
WB8TSL
On Fri, Dec 7, 2012 at 8:39 AM, W2GPS wrote:
> Paul,
>
> Regarding SSR-Pricing, Synergy said they will make the new SSR-6Tr timing
> board
> available at $35 FOB San Diego (ab
On 12/6/12 11:20 PM, Don Latham wrote:
Good thought, Bob. AD9548 $27, eval board a whopping $250, get a
thunderbolt :-). The eval board has a lot of SMA's on it...
This is a general problem with eval boards these days.. They provide a
lot of functionality on the board to make it easy to evalu
On 12/6/12 5:01 PM, Bob Camp wrote:
Hi
The solution to the problem is well known in several forms. Cost is below $5
for pretty much all of them. No need to re-invent the wheel. The gotcha is that
you can't do it 100% with internal CPU peripherals. You will need *some* glue.
I think that's th
On 12/6/12 11:12 PM, Hal Murray wrote:
Suppose you just implement a simple bang-bang control.
Suppose the EFC is 1 volt and the frequency is correct but the GPSDO
phase is a bit early relative to the GPS PPS. So the FF says early
and the software says go-faster. That keeps happening for a
GPL and Open Source are frequently confused technically any code where the
source code is available to the customer is open source. As in open for
inspection, under terms agreed to in the license.
What most people think about when they hear about open source is code released
under variants of
Chris
So you also must run the gatesgarth website. I was thinking there might be
other good tidbits. The EIP manual was nice. Good job on the control signal.
I had a chance to reread the theory of operation yesterday (Well parts) and
if band 2 is now working by cheating at least, then it would be i
On 12/6/12 1:56 PM, Bob Camp wrote:
Hi
The single best thing about a TBolt is Lady Heather.
Consider how many years it's taken to get it to where it is today. Consider
how many people have worked extensively on it. It's a wonderful thing to
have available.
Could you make a homebrew gizmo look
Fabio Eboli ha scritto:
Bob Camp ha scritto:
The analog TDC is a fine idea. Cheap, easy,
Easy for many, not for me. This is why
I like the idea to play with the TAC, I have very
Here I'm using TAC and TDC for the same meaning...
little experience with such high speed stuff, it's like
Paul,
Regarding SSR-Pricing, Synergy said they will make the new SSR-6Tr timing board
available at $35 FOB San Diego (about half the $69.85 commercial price) for
educational pursuits which include Ham radio, educational institutions,
experimenters, etc. (limit one part per customer). For compariso
Bob Camp ha scritto:
Hi
I believe your second counter (the one that starts on one edge and
stops on the other) will have trouble. It is unlikely you will get
your 14 ns resolution out of it.
Are you thinking to sync logic inside the device or
other problems? (not considering "defects" li
Hi
That is an impressive hourglass. In the context of the thought experiment "swap
offer" - no, mine is not a work of art. It's only value is as a time keeper.
Bob
On Dec 6, 2012, at 10:37 PM, DaveH wrote:
> If you had an Ikepod, I might be interested.
>
> http://www.ablogtowatch.com/ikepod
Hi
I believe your second counter (the one that starts on one edge and stops on the
other) will have trouble. It is unlikely you will get your 14 ns resolution out
of it.
The analog TDC is a fine idea. Cheap, easy, and requires a few parts that are
not built into the micro controller. The simpl
Hi
In this case it's very much a "you get what you pay for" sort of thing. You are
indeed comparing an hourglass to a cesium standard.
Bob
On Dec 7, 2012, at 2:20 AM, "Don Latham" wrote:
> Good thought, Bob. AD9548 $27, eval board a whopping $250, get a
> thunderbolt :-). The eval board has a
Hi
You are driving an integrator (the OCXO). You want a very stable voltage on the
EFC to get the loop to close. A PWM is as simple a model for a 1 bit D/A as
any. One bit A/D's are a feedback on a 1 bit D/A. You do some stuff to move the
noise around and to get it all to work.
Bob
On Dec 7
Hi
To make things play nice, you would like to have the timer counters reset at a
specified point. That way the math all works out nicely.
Bob
On Dec 7, 2012, at 12:18 AM, Hal Murray wrote:
>
> li...@rtty.us said:
>> That would be an input capture rather than an interrupt.
>
> Thanks. Yes,
__
> This is where I am now, I hope the above makes some sense if
> viewed with the service manual and the schematics. Thanks.
07/12/2012 10:17
Latest update:
Removed Q12 from board A109 and put a 1k resistor across vacant
emit
Michael Tharp ha scritto:
On 12/6/2012 4:26 AM, Fabio Eboli wrote:
Are you using the pll to obtain 72MHz (x9) for the clock?
Yes, the crystal oscillator is multiplied up to 72MHz which then
drives the timer. Even though the particular timer peripheral I
chose happens to be on the APB1 bu
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