Niels Lueddecke wrote:
> Don't do it, it may drag you deep into nut territory...
>
> All i wanted was a clock based on a cheap LPro rubidium.
> Next thing i knew were strange things piling up on my desk.
> Now theres a custom power supply, 7 AVRs on a couple of boards,
> an FPGA running a 1GHz co
Neon John <[EMAIL PROTECTED]> wrote:
> I'd have put a head in each cube
> if that had been possible.
What kind of head? Or whose head?
Curious,
MS
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Neville Michie <[EMAIL PROTECTED]> wrote:
> If leap seconds are applied to keep the meanderings of the planet in
> phase with our mean time
> clocks, then what about our leap year days which are applied to keep
> the seasons in phase with our
> calendars? Applying a whole day every so many yea
Hal Murray <[EMAIL PROTECTED]> wrote:
> The only guy who got it right was John Wakerly from Stanford.
Yay, the author of my favourite book on digital design!
MS
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Bill Hawkins wrote:
> The passage grave at New Grange, Ireland, is one of those astronomical
> wonders where the rising sun at winter solstice shines down a relatively
> long tunnel to shine on carved stone at the far wall of a chamber.
>
> We know that solstice has the shortest day and the longe
"Lux, James P" wrote:
> Things get done for funny reasons: After all, the physical size of France is
> why ATM "cells" (packets) are 53 bytes (48 byte payload) instead of either 32
> byte or 64 byte payloads.
Huh? Can you please elaborate? I thought the 48 octets of payload were
a compromise b
John Miles wrote:
> Not everybody can stomach Google's perversion of Usenet (which admittedly
> was no small engineering feat in itself).
Aren't there still non-Google ways of accessing Usenet?
MS
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Chuck Harris wrote:
> Google wrecked dejanews in the spirit of political correctness,
> the nanny state, and trying to pretend that usenet is just a part
> of google groups. Erasing all of the email addresses, and other things.
Does anyone know exactly where (building, city, country, continent)
Regardless of the reason as to why eBay sellers won't ship outside USA
no matter how much you beg or how much you pay them, the solution is
obvious: have an intermediate "in the belly of the beast" do the proxy
buying and reshipping.
I would be very glad to act as that intermediate for virtually a
Jean-Louis Oneto wrote:
> If you take the leap
> seconds out of UTC (in fact UTC(GPS), steered close to UTC(USNO)), you will
> _not_ get TAI, just UTC(GPS)-34s...!
You will get TAPF = Temps Atomique Pedant-Free! TAPF is identical with
TAI in every respect except for not having the assinine p
As I have learned in school from a department head, mean time between
failures (MTBF) means anything only if you are being mean. If you are
not being mean, it means nothing.
MS
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Corby Dawson wrote:
> At the lower clock rate I can't communicate as the corrected baud rate
> comes out to 955 baud.
> [...]
> Are there any terminal programs out there that allow you to select rates
> other than the standard values?
The restriction to standard baud rates only is a hardware lim
Hal Murray <[EMAIL PROTECTED]> wrote:
> Does anybody know how DSL works? If I poke around with a scope in my DSL
> modem/router, will I find a clock locked to the telco's master clock?
I doubt it. DSL lines come from DSLAMs, not from "real" telco equipment
like switches and synchronous digital
Hello time-nuts,
Sorry for the off-topic post, but reading my mail this morning I've seen
a few messages go by on this list about bad solder joints due to the
RoHS stupidity, and I have a question about that.
My interest in the matter is from the perspective of a hobbyist hardware
builder -- of t
Hello again,
Thanks to everyone who has replied to my query!
I have a few additional questions though:
1. What about the tin whiskers? Will they be eliminated by using SnPb
solder, or will they always remain a potential problem when one is
forced to use a Pb-free part?
2. Several people have r
Hello time-nuts,
I've been on this list for several years now and I've made a few little
comments on occasion, but this will be my first real technical post.
I desire to build a timekeeping apparatus which I have nicknamed the
rubber duckie, or a Rubber Time Generator. As I've voiced very
vigoro
Chris Albertson wrote:
> In engineering something like this it is very impotent NOT to mix up
> "primary requirements", "derived requirements", "implementation
> details".
> "primary requirements" describe the thing you want, NOT how it works.
> Derived ones are the logical fallout from the first
Chris Albertson wrote:
> I think you can do just fine without GPS and GPSDXO oscillators and
> the like. NTP over the Internet is an order of magnitude better then
> you need.
No, I really don't want anything NTP-based. Or let's put it another
way: part of my objective is to set up a stratum
Henry Hallam wrote:
> The parameters you'll want for conversion between MCAT and mean solar
> time are given daily in the IERS bulletins:
> http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletins.html
Yes, I know.
> By making use of these you should be able to do much better than the
> sligh
Hello again,
Thank you all for your recommendations. It looks like I will go with a
ThunderBolt: I have found Trimble's manual online, read all of it, and
it looks like the unit will do exactly what I am after.
I will feed all 3 outputs from the TBolt (10 MHz, 1 PPS, EIA-232) to a
custom timekee
Chris Albertson wrote:
> Why such complex a system when you don't need it?An FPGA???
Fixing a logic mistake in an FPGA involves editing a Verilog source file
and recompiling; fixing a logic mistake in discrete logic involves a
board respin. I much prefer editing ASCII text source files and
Chris Albertson wrote:
> NTP software can keep system time within a few milliseconds of UTC.
> No custom hardware, no FPGA or PCB.
But I _*REFUSE*_ to do it that way. You've mentioned UTC: that's one
thing I'm taking great care to avoid in my solution. I want my system
to be completely insula
Chris Albertson wrote:
> It's even less logical than that. With "rubber seconds" tied to the
> Earth's rotation. You ultra stable cesium clock is no longer running
> at a fixed frequency.
Wait a minute here, Chris... Weren't you just telling me the other day
how important it is to maintain a
Hello again,
I have just written up the formal spec for the UTR timescale which I'm
seeking to implement on my "rubber duckie" timekeeping apparatus which I
had discussed here earlier this week, and I have released the first
draft for review:
http://ifctfvax.Harhan.ORG/timekeeping/draft-utrspec.t
Magnus Danielson wrote:
> > The present specification outlines a low cost method for obtaining a
>
> "low cost method" is a potential goal, skip statement here.
IOW, you are suggesting that the line in question read
"The present specification outlines a method for obtaining a synthetic
timescal
Magnus Danielson wrote:
> You just got better wordings here. scalar and mononously are the key
> things, then say that.
OK, I'm not a mathematics major, but aren't "scalar" and "real number"
two different terms for the same thing? I admit to not knowing whether
complex numbers also qualify as
Poul-Henning Kamp wrote:
> That is a very good question, the answers you get if you try to press
> this point starts with handwaving and ends with "look, just don't, OK ?"
And what happens if you ignore their edicts and do it anyway? It's
called Civil Disobedience. Using TAI is just like refus
Richard W. Solomon wrote:
> I just got another T-Bolt, this time a Rev E.
What is special / noteworthy about this rev? I have recently bought my
first T-Bolt (from another listmember, and I have yet to power it up),
and it's also a Rev E.
MS
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Mark Sims wrote:
> On July 30, 2017 all our Thunderbolts turn into back-dated pumpkins...
But aren't there fields in one of the TSIP messages which give the raw
bird-transmitted 10-bit week number and TOW, bypassing all processing /
tampering by the firmware? I was thinking of taking these fie
Hello Time-Nuts,
I would like to ask some public policy questions to Congressional
Candidate Brooke Clarke, and because these questions deal with
timekeeping matters, I argue that they are on-topic for this list.
Question 1: Do you feel that legal time in USA should be anchored to a
natural pheno
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