I am using the PPS from a Garmin GPS16 to timestamp a VLF
signal received directly via a PC soundcard. Signal into one
channel, PPS into the other.
Using pulse centroid timing, I'm seeing about 0.5uS jitter of
the pulse-to-pulse interval, and an exponential moving average
with time constant 100
Hi Paul,
Others on this list will reply more authoritatively, but I don't
believe that cyclic variability is GPS - I've not noticed such a thing
on any of the systems I monitor. Can you carefully monitor
temperature and PSU voltage, and maybe find a correlation there?
Peter
Hello!
If considered useful, I can send you the yesterday record of my GPS
TBolt #2 against DCF77, which apparently doesn't show any periodic
phase variation. The VLF receiver is a Tracor 599K and the chart
span is 10 uS. If there was such a variation it should be clearly
visible.
Antonio
CT1TE
Dear Richard, and other Time-Nuts,
Congratulations! Looks like a very nice design!
One remark and one question:
* Remark: For those running a non-windows-OS, use Virtualbox (for exampe
the free version from Oracle). This works perfect and allows e.g. Linux
users to run windows applications,
Lets see what Richard says. I have just gone through that with my D/M which
is in its second test phase and I did ship boards oversees. May do that
one time.
Bert
In a message dated 7/1/2010 9:13:57 A.M. Eastern Daylight Time,
j.bastemei...@tudelft.nl writes:
Dear Richard, and other
Me too!
On 2 July 2010 00:50, Jeroen Bastemeijer j.bastemei...@tudelft.nl wrote:
Dear Richard, and other Time-Nuts,
Congratulations! Looks like a very nice design!
One remark and one question:
* Remark: For those running a non-windows-OS, use Virtualbox (for exampe the
free version from
I am not sure about the Garmin GPS16, but all of the GPS receivers I use do
not rigidly define the falling edge of the 1PPS signal. Perhaps you should
use only the leading edges for the pulse-to-pulse interval measurement.
John WA4WDL
--
From:
OK, email me off list the number of boards and address so I can calculate
postage and I will order them.
Stanley
- Original Message
From: Steve Rooke sar10...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu, July 1, 2010 8:34:57 AM
The price would be at my cost and actual shipping, no packaging or processing
charges added by me. Not sure of price till I have the number of boards but
hope
as a group we will get a better price. This would also allow us to order just 1
if that is the need. I can take paypal but that has
Interesting.
The period of variation is approx. 50 minutes. Trying to think what that may
be related to.
Would like to see the results taking the leading edge of the 1PPS also. I'm
assuming your location is fixed, and you are tracking sufficient SVs, as
I've seen something similar when moving.
I'd like one.
On Thu, Jul 1, 2010 at 11:41 AM, Stanley Reynolds
stanley_reyno...@yahoo.com wrote:
The price would be at my cost and actual shipping, no packaging or processing
charges added by me. Not sure of price till I have the number of boards but
hope
as a group we will get a better
And here is a request for yet another, to keep the price down :-)
regards,
paulg8gja
-Original Message-
From: Stanley Reynolds [mailto:stanley_reyno...@yahoo.com]
Sent: 01 July 2010 16:42
To: time-nuts@febo.com
Subject: Re: [time-nuts] PICTIC II
The price would be at my cost and
Thanks all for the various replies, on and off list.
John WA4WDL wrote:
Perhaps you should use only the leading edges for the
pulse-to-pulse interval measurement.
Yes, I'm just using the leading edge, turning it into a pulse
using a couple of RC networks, slowing the rise and fall enough
to
Hi
What kind of caps are you using in the network? Some of the stuff you get
these days has really awful TC.
I'd put a heat gun on your R/C networks and see what happens...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Paul
Am 01.07.2010 16:44, schrieb Stanley Reynolds:
OK, email me off list the number of boards and address so I can calculate
postage and I will order them.
The price would be at my cost and actual shipping, no packaging or processing
charges added by me. Not sure of price till I have the number
Stanly
I have shipped in the last couple of month boards to NZ and Germany. No
problem, but you have to make sure for Europe no lead, is an option with
Expr. PCB, may want to include a copy of the invoice that clearly shows no
lead. An old cut up padded envelop in a regular envelop with
Bob Camp wrote:
I'd put a heat gun on your R/C networks and see what happens...
Yes, good point. The RCs must have a temperature coefficient,
maybe not something I can neglect, I'd better look at that.
In fact, now that I know it's not inherent to GPS, I have quite
a long list of things to
Is the environment heated or have AC? With a period of about 40 minutes
I'd look for something thermal.
FWIW,
-John
Hi
What kind of caps are you using in the network? Some of the stuff you get
these days has really awful TC.
I'd put a heat gun on your R/C networks and see
What is the soundcard sample rate? This feels like an artifact of
sample phase vs. pulse phase to me.
Matthew Kaufman
(Sent from my iPhone)
On Jul 1, 2010, at 9:06 AM, Paul Nicholson vlf0...@abelian.org wrote:
Thanks all for the various replies, on and off list.
John WA4WDL wrote:
time-nuts-boun...@febo.com wrote on 07/01/2010 12:06:54 PM:
From:
Paul Nicholson vlf0...@abelian.org
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
07/01/2010 12:08 PM
Subject:
Re: [time-nuts] Long period variation of GPS PPS timing?
I expect the board cost to be $8 each + shipping.
Will email everyone I receive a request from in a few days and then post here
for any lost emails / last call.
Stanley
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Hi Stan,
I'm also interested in the PICTIC II group buy. Many thanks.
Jim Robbins
N1JR
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Matthew Kaufman wrote:
What is the soundcard sample rate? This feels like an artifact
of sample phase vs. pulse phase to me.
There are actually two soundcards, running at
192003.8285 and
192002.1638
samples/sec, varying a little. They are on different computers.
One takes an East/West
FYI, some time has elapsed with one soundcard instead
of two and the slow cycle is still present, same period,
and the phase of the slow cycle did not make a step
change.
Now I must take a careful look at how the centroid is
being determined, the resampling, RC temperature, etc.
Maybe the
time-nuts-boun...@febo.com wrote on 07/01/2010 02:01:25 PM:
From:
Paul Nicholson vlf0...@abelian.org
To:
Discussion of precise time and frequency measurement
time-nuts@febo.com
Date:
07/01/2010 02:02 PM
Subject:
Re: [time-nuts] Long period variation of GPS PPS timing?
Sawtooth variation in pps time - that does sound a bit familiar in reference to
GPS timing.
e.g.: http://www.leapsecond.com/pages/m12/sawtooth.htm but that's over a
MUCH shorter time scale than you report which seems to a around 3000 seconds.
So I wouldn't write it off as being unrelated to
There is an interesting article describing the Quartzlock E8000 series of
GPSDO's in the June 2010 Microwave Journal. It goes into details as to
method used. Worth reading.
Bert Kehren
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Does anyone has data on the
MTI 230-0546-A OCXO (5MHz).
( If no datasheet, just pinout best guess
may help ).
Many thanks.
Luis Cupido.
ct1dmk.
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Luis Cupido wrote:
MTI 230-0546-A
Is the pinout similar to the other 230 series OCXOs?:
http://www.mti-milliren.com/pdfs/230.pdf
Bruce
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Looks like the 230 series is still supported by Milliren:
http://www.mti-milliren.com/pdfs/230.pdf
-- john, KE5FX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Luis Cupido
Sent: Thursday, July 01, 2010 4:20 PM
To: Discussion of
Tks, Bruce,
Tks, John,
Looks that is it.
(I could not find the info...
must improve my googling skils hi).
Not sure how to decipher the reference but
at least I know it is a 5MHz and know
what kind of performance to expect, in principle.
Many thanks.
Luis Cupido.
ct1dmk.
John Miles wrote:
Hi,
If your GPS run in fixed position mode, how do you determine the position?
Could this cycle be an artefact caused by a bad position? 50 mn could be the
order magnitude of visibility of a satellite?
Just a thought...
HTH,
Regards,
Jean-Louis Oneto
- Original Message -
From: David
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