I think the Grand Seikos are specified at the same +/- 10 seconds a
year accuracy as that Bulova. They use a slightly different approach
though - it's a standard 32768 Hz xtal, but its thermally compensated.
I don't know of any other watches that use a 262144 Hz xtal on its
own, but there were
With the CMOS logic used in watches, the big power hog
is due to charging and discharging the gate capacitance
of the various logic gates. The faster you charge and
discharge the gate's, the more power you loose due to
I2R losses, and E-M radiation.
Thankfully, the high capacity lithium cells
Lady Heather depends upon the ability of the Thunderbolt to broadcast the time
message automatically every second. Apparently the Palisade type units do not
support this mode of operation. It might be possible to set up the software
so that it requests the time message continuously and
Le 19/12/2011 06:47, Perry Sandeen a écrit :
Is a 10 MHz or so crystal on the horizon?
Dunno, but some 10-50MHz TCXO/VCTCXO are now available in 2mm
packages, so why not. There might be battery longevity issues with
driving the higher frequency. I guess it comes down to whether the
Pete
Yes indeed it is cut halfway up on the bottom side it slices to the right.
No idea if it would have an effect
Fact that it would not work with Lady heather certainly makes it
un-exciting.
Regards
Paul.
On Mon, Dec 19, 2011 at 1:47 AM, Peter Bell bell.pe...@gmail.com wrote:
Most of the
I agree with Peter. This board has been sawn off the end of a larger PCB. The
PSU is typical telco, 36-75V.
Half the price of a standard Thunderbolt though.
Robert G8RPI
From: Peter Bell bell.pe...@gmail.com
To: Discussion of precise time and frequency
Don't recognise it.
Obviously a telecoms system of some sort as -48VDC. From a Google search of
the Trimble P/N I get some Chinese sites which you can glean something about
an ultra stable 10 MHz OCXO. I couldn't see a GPS module on the board,
unless it's under the OCXO, but I doubt that.
Not
See also http://www.zmdz.com/bbs/forum_read.asp?id=65091
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: 19 December 2011 04:41
To: Discussion of precise time and frequency measurement
Subject:
It's not paranoia if it's true! :-)
Take a look at the pictures for # 270725678037 . These boards don't
have the connector cut off of the corner of the board. Good eyes.
Ed
On 12/19/2011 12:47 AM, Peter Bell wrote:
Most of the parts (and their grouping) seem the same as the NTPX26AB -
Connectors cut off so it can not be used in its original application?
Bert Kehren
In a message dated 12/19/2011 10:55:31 A.M. Eastern Standard Time,
ed_pal...@sasktel.net writes:
It's not paranoia if it's true! :-)
Take a look at the pictures for # 270725678037 . These boards don't
have
That would make sense - when I was using one of the original Palisade
units I remember that once it was tracking it only output the time
packet every 150 seconds - which seemed rather strange for something
that was being sold as a timing device. You could set it up to output
a time packet with
That's well spotted - and it also reveals that this board _doesn't_
have a PPS output - it has a CDMA style PP2S output driven on each
even second. It's also got a 8xChip (9.8304 MHz) output - but I doubt
that is useful to anyone outside a CDMA context.
So it looks like it's useful for a 10MHz
I saw a road grader this summer with a GPS antenna on each end of the blade,
about 10 feet. Must have been using RTK . So that distance should be OK.
N0UU
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I see fluke.i selling older GPSDOs consisting of a large board with the guts
(more or less) of a Thunderbolt, a smaller board with switches and
indicators,
and a ribbon cable to connect them.
With a FW of 1.88 and date code a few years older than a Thunderbolt,
I would guess this was a
Seems unlikely. They were probably scrapped rather than resold because
the original application is obsolete. Also, it would be a significant
job to take the module apart so that you could cut off the connector so
neatly. There are easier and faster ways to prevent reuse. Maybe the
Hi Ed,
my mistake, the test started from cold, but the curve I've posted starts at a
certain midnight. For completeness, the very initial warm-up is missing in the
curve. Checking my archive, I see that the test started the previous day around
02:22 pm and the reading was 3 mHz higher, and I
Is there some industry standard on the data format these time standards use?
For instance, the thunderbolt software and Lady Heather work fine with my
Starloc.
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Hi Rob,
It has a component level GPS, not a standard module.
Interesting that some have connectors cut off and none are being sold with the
case. I think that there were restrictions regarding re-use as part of the
disposal contract. Perhaps different interpretation by some re-sellers. I doubt
Antonio,
I suspected something like that.
I realized that I've never done a similar test so I'm correcting that
now. Both the oscillator and the counter have been off for some time -
days for the counter due to equipment rearrangements and months for the
oscillator. I replaced the 04E
On 12/19/2011 5:34 AM, Chuck Harris wrote:
It is not clear to me that a 32KHz xtal is any less stable
than a 262KHz xtal, though. I would think there would be a lot
more to be gained by using a microprocessor/thermistor to
measure the temperature within the watch, and provide an
adjustment to
This is worth reading:
http://www.rwonline.com/article/lightsquareds-travails-mount/50851
Burt, K6OQK
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
b...@att.net
www.biwa.cc
K6OQK
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On Mon, 12 Dec 2011 09:42:14 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
Thanks. The findchips.com suggestion was good. Seems the 74AC
part really is not available but there is a CD74ACxxx part that
looks good.
The CD at the front just means it's from TI instead someone else.
I wrote:
I put one of mine in standby earlier this afternoon. I'll turn it
back on tomorrow afternoon and report the results.
(All results using 10 second gate): Yesterday, the 1992 had been
reading 000.00 E-3 stably for several days, and I switched it
to standby. After 16 hours in
On Mon, Dec 19, 2011 at 4:21 AM, Mark Sims hol...@hotmail.com wrote:
Lady Heather depends upon the ability of the Thunderbolt to broadcast the
time message automatically every second. Apparently the Palisade type units
do not support this mode of operation. It might be possible to set
The first reading after turn-on was about 370 Hz (yes, Hertz) low.
After 20 minutes the initial warm-up was complete and the reading was
238 counts (e.g. 0.238 Hz) above 10 MHz - well within the 1e-7 specification.
That's awfully similar to how mine behaves. I'm currently doing my annual
Charles,
My restart followed the same pattern as yours. Start high, go higher,
drift down, undershoot, recover. The start was 10 MHz +51 counts, rise
to +60 counts after 5 minutes, drift down to a minimum of +8 counts
after 90 minutes and recover to +11 counts after 10 more minutes for a
There was a spec issued many years ago to the industry from Lucent I believe
to come up with a GPS product for base station requirements. 10 MHz, 1PPS,
OCXO, RS-232 port, and a certain holdover spec. The Thunderbolt was one,
Starloc another, NanoSync (from Odetics/Zyfer). There were others.
Rob
I think the PCB cut off at ebay # 300628220912 is an image artifact. If you
look carefully you'll see the cut extend into the gray area on the right.
Fluke-L (it's L, not i) wouldn't foist a sawn-off board to sophisticated
buyers.
Aart Olsen
- Original Message -
From: Ed Palmer
I will post a copy of the article on my web site later today.
Didier KO4BB
--Original Message--
From: Dusty Morris
To: Didier Juges via Gmail
Subject: Fwd: LORAN RECEIVER
Sent: Dec 19, 2011 12:08 PM
Didier -
I would like a copy of the Aug 94 73 article on the LORAN receiver
if
On Dec 19, 2011, at 11:59 AM, Chris Albertson wrote:
Where is the source code for Lady Heather?
It's included with the binary distribution.
Kevin
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This is typical for an underdamped second order servo. The oscillation
is the penalty for a shorter settling time. A critically damped system
would not oscillate, but approach the final value smoothly in a slightly
longer time. It may have been designed for a slight overshoot...
Don
Ed Palmer
In Europe the Loran-C is still active (Ireland, France, the Netherlands,
Denmark, Norway and Germany). here in north Italy maybe the Lessay chain is
receivable. I'll test as soon as I receive the Raynav 520 bought on paybay
from Canada very long ago and not yet delivered.
On Mon, Dec 19, 2011 at
On 19 Dec, 2011, at 11:25 , Rob Kimberley wrote:
There was a spec issued many years ago to the industry from Lucent I believe
to come up with a GPS product for base station requirements. 10 MHz, 1PPS,
OCXO, RS-232 port, and a certain holdover spec. The Thunderbolt was one,
Starloc another,
My mistake:
I wrote:
(peaks = PC has been turned on, dips = PC has been turned off).
Please read:
(dips = PC has been turned on, peaks = PC has been turned off).
Antonio I8IOV
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Well, the 1992, at least mine, is sensitive to rapid changes of the ambient
temperature, while ignores quite well the slow changes such as those due to the
cycling of the heating system of the house (which is well evident in the
recorded temperature of the LPRO heatsink).
And I see that the
It looks like he laid out paper to use as a background and the PCB is just
under the edge of one sheet.
-Bob
On Mon, Dec 19, 2011 at 1:49 PM, aartmol...@comcast.net wrote:
I think the PCB cut off at ebay # 300628220912 is an image artifact. If
you look carefully you'll see the cut extend into
My 5680A arrived today. Mailman demanded a signature.
This thing requires plenty of current to get started.
My Tek CPS250 1.2 amp output (A+B parallel) only gets 7.5 volts.
Now to scrounge something a bit bigger.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of
dan...@verizon.net wrote:
The best crystals for room temperature use are around 4 MHz with
temperature inflections around 20C, and this is what was used in an
early Braun alarm clock I had which also had this kind of performance.
Long gone, alas.
and this is what the clock of my old german
In a message dated 19/12/2011 22:27:22 GMT Standard Time, c...@omen.com
writes:
This thing requires plenty of current to get started.
My Tek CPS250 1.2 amp output (A+B parallel) only gets 7.5 volts.
Now to scrounge something a bit bigger.
-
The 15 volts to pin 1 starts
There is nothing in Ireland Azelio, that station is in England just south of
the Scottish border at Anthorn
Alan G3NYK
- Original Message -
From: Azelio Boriani azelio.bori...@screen.it
To: shali...@gmail.com; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent:
I was inside a AT$T shack about a month ago. They have GPS timing inside. I
took some photographs, so I will dig up later what timing they use.
-Original Message-
From: Dennis Ferguson dennis.c.fergu...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Mon, 19 Dec 2011 14:00:29
To:
Ops, I made a mistake... yes, you're right.
On Tue, Dec 20, 2011 at 12:13 AM, Alan Melia alan.me...@btinternet.comwrote:
There is nothing in Ireland Azelio, that station is in England just south
of
the Scottish border at Anthorn
Alan G3NYK
- Original Message -
From: Azelio Boriani
Hi guys,
I know there has been recent talk about this and it got me back into
building my PICTIC II boards. I went through the parts list and created a
new copy that includes everything except U6, the 74AC175 chip that is out
of production. Part ID numbers (C16, R8, etc) are listed as well.
Looking at the datasheet for the DS3232, it doesn't appear
that they mean for it to run off of a small coin cell in a
watch. Its battery operating capability is purely to keep
it running when the main power is turned off.
I would suspect that the DS3232's power consumption is due
to its being
Yes, USA GSM/UMTS operators also use GPS at their base stations. They may use
it
for timing, but I think the primary requirement for it comes from E911 support,
and maybe to provide AGPS and/or clock-setting support for phones.
European and Asian operators often do without it (they typically
Got mine going with a 15 volt 3 amp supply from an old Toshiba.
That and 5 volts.
It took about 32 minutes to make lock. Before that it was
cycling between about +75 and -200 Hz.
The FE-5680A 10 MHz is now off by .002 Hz compared to the Thunderbolt.
I placed a magnet on the case. It appears
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