On 3/4/2012 6:10 PM, Bruce Lilly wrote:
On Sun, 04 Mar 2012 22:37:35 +, Ron Frazier (NTP) wrote:
I
want to see what the max performance I can get with USB with handshaking
is possible. I think I can break the + / - 1 ms barrier.
See http://gpsd.berlios.de/faq.html#time
On Mon, Mar 5, 2012 at 01:26, David Lord wrote:
> You need to use PPS to get lower offsets. I've no idea if
> PPS will work via a serial to usb adapter but I'd guess
> that it will and you will get an improvement.
In general, it won't. The problem is the PPSAPI DCD timestamping
needs to be part
Ron Frazier (NTP) wrote:
..
I may try pulling the signal directly from the PPS directly to DCD as
you describe. If it works, the procedure might be a bit simpler. By
the way, are the data lines on the serial port of the Sure board running
at standard RS-232 levels?
The TxD and RxD d
On Sun, 04 Mar 2012 22:37:35 +, Ron Frazier (NTP) wrote:
> I
> want to see what the max performance I can get with USB with handshaking
> is possible. I think I can break the + / - 1 ms barrier.
See http://gpsd.berlios.de/faq.html#time
___
que
Ron Frazier (NTP) wrote:
Hi all,
Some of you know from my prior threads that I've been debating what GPS
to buy to upgrade from my USB based BU-353. I think I've just about
nailed it down, based on a number of conflicting factors.
I'm getting + / - 6 ms accuracy now with the BU-353. My goa
On 3/4/2012 3:18 PM, unruh wrote:
On 2012-03-04, Ron Frazier (NTP) wrote:
Hi all,
Some of you know from my prior threads that I've been debating what GPS
to buy to upgrade from my USB based BU-353. I think I've just about
nailed it down, based on a number of conflicting factors.
I'm gett
On 3/4/2012 3:37 PM, unruh wrote:
On 2012-03-04, John Hasler wrote:
nemo_outis writes:
It was specifically chosen, not because of its deep significance as a
'universal physical constant', but specifically to make the 'new'
second very close to the old 'earth-rotation' second.
But not exact.
On 3/4/12 8:32 AM, unruh wrote [in part]:
> On 2012-03-04, John Hasler wrote [also in part]:
>>
>> Just as tzdata allows conversions between UTC and your local zone. Thus
>> UTC is the Earth planetary zone as CST is my local zone within that
>> planetary zone. While it is convenient to have sola
On 3/4/12 12:32 PM, Dave Hart wrote [in part]:
> On Sun, Mar 4, 2012 at 16:27, unruh wrote:
>> Thus one could, as Hasler does, aruge that UTC is simply an aberation,
>> like leap years, and like time zones, from the orderly progression of
>> the seconds (TAI), and should be handled in exactly the
Thanks for the info. Comments inline.
On 3/4/2012 1:51 PM, David J Taylor wrote:
Hi all,
[]
From my reading, it appears that I need to add the following to the
Sure Electronics package of parts:
1) DB-9 Male - DB-9 Female serial cable
Correct. I got mine from Amazon. Search for "2m 9 Pi
On 3/4/12 5:46 AM, John Hasler wrote:
> I wrote:
>> Thus UTC is just a kind of timezone-like localization and leap-seconds
>> belong in tzdata.
>
> David E. Ross writes:
>> No, it is not a localization.
>
> It localizes TAI to this particular planet.
>
>> A leap-second file allows conversions be
On 2012-03-04, John Hasler wrote:
> I wrote:
>> [UTC] localizes TAI to this particular planet.
>
> unruh writes:
>> That makes it sound as if TAI is some God given time.
>
> There being no god, nothing is god-given.
>
>> It is not. It was developed and defined in the context of precisely
>> this p
On 2012-03-04, John Hasler wrote:
> nemo_outis writes:
>> It was specifically chosen, not because of its deep significance as a
>> 'universal physical constant', but specifically to make the 'new'
>> second very close to the old 'earth-rotation' second.
>
> But not exact. Can't be: the rotation i
On Sun, Mar 4, 2012 at 16:27, unruh wrote:
> Thus one could, as Hasler does, aruge that UTC is simply an aberation,
> like leap years, and like time zones, from the orderly progression of
> the seconds (TAI), and should be handled in exactly the same way as leap
> days, daylight saving time, or ti
On 2012-03-04, David J Taylor wrote:
>> Hi all,
> []
>> From my reading, it appears that I need to add the following to the Sure
>> Electronics package of parts:
>>
>> 1) DB-9 Male - DB-9 Female serial cable
>
> Correct. I got mine from Amazon. Search for "2m 9 Pin Serial / RS-232
> Extension
On 2012-03-04, Ron Frazier (NTP) wrote:
> Hi all,
>
> Some of you know from my prior threads that I've been debating what GPS
> to buy to upgrade from my USB based BU-353. I think I've just about
> nailed it down, based on a number of conflicting factors.
>
> I'm getting + / - 6 ms accuracy now
nemo_outis writes:
> It was specifically chosen, not because of its deep significance as a
> 'universal physical constant', but specifically to make the 'new'
> second very close to the old 'earth-rotation' second.
But not exact. Can't be: the rotation is not stable. I'm not
advocating the elimi
John Hasler wrote in
news:878vjgz3qq@thumper.dhh.gt.org:
> I wrote:
>> [UTC] localizes TAI to this particular planet.
>
> unruh writes:
>> That makes it sound as if TAI is some God given time.
>
> There being no god, nothing is god-given.
>
>> It is not. It was developed and defined in th
Hi all,
[]
From my reading, it appears that I need to add the following to the Sure
Electronics package of parts:
1) DB-9 Male - DB-9 Female serial cable
Correct. I got mine from Amazon. Search for "2m 9 Pin Serial / RS-232
Extension Cable M-F".
2) Motherboard header - DB-9 port adapte
I wrote:
> [UTC] localizes TAI to this particular planet.
unruh writes:
> That makes it sound as if TAI is some God given time.
There being no god, nothing is god-given.
> It is not. It was developed and defined in the context of precisely
> this planet.
It is based on universal physical consta
On 2012-03-04, John Hasler wrote:
> I wrote:
>> Thus UTC is just a kind of timezone-like localization and leap-seconds
>> belong in tzdata.
>
> David E. Ross writes:
>> No, it is not a localization.
>
> It localizes TAI to this particular planet.
That makes it sound as if TAI is some God given ti
On 2012-03-04, David E. Ross wrote:
> On 3/3/12 1:13 PM, John Hasler wrote:
>> David E. Ross writes:
>>> Why require a UTC adjustment from TAI? If the data represent a
>>> satellite orbiting the earth and the sub-satellite point on the
>>> earth's surface is needed, the TAI is converted to UTC, w
Hi all,
Some of you know from my prior threads that I've been debating what GPS
to buy to upgrade from my USB based BU-353. I think I've just about
nailed it down, based on a number of conflicting factors.
I'm getting + / - 6 ms accuracy now with the BU-353. My goals for the
new device are
I wrote:
> Thus UTC is just a kind of timezone-like localization and leap-seconds
> belong in tzdata.
David E. Ross writes:
> No, it is not a localization.
It localizes TAI to this particular planet.
> A leap-second file allows conversions between UTC and TAI.
Just as tzdata allows conversions
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