On 12/3/18 10:45 AM, Brooke Clarke wrote:
Hi Dana:
I converted a stock 24 hour wall clock to sidereal time using a "Crazy
Clocks" module:
https://www.tindie.com/products/nsayer/crazy-clock/
http://prc68.com/I/QuartzClk.shtml#Sidereal
I gave it to the local latitude observatory
I am on the east coast and the everset chips work very well I have had a
unit for musty be 5 years and ran tests for them. So at least here in
Boston it does very fine.
Hope that helps.
Regards
Paul
WB8TSL
On Mon, Dec 3, 2018 at 10:33 PM Alex Pummer wrote:
> that address is incorrect: Website:
that address is incorrect: Website: www.EversetClocks.com
Alex
On 12/3/2018 6:20 PM, Paul Bicknell wrote:
Hi All
There is a 60 Khz frequency standard operating in the UK
So do the two signals interfere with each other?
Paul
-Original Message-
From: time-nuts
Hi thank you Bob for the mail
Do you realise the 60 Khz Transmitter in the UK was moved from Rugby in the
centre of England north by more than 200 miles
Paul
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Bob
kb8tq
Sent: 04 December 2018
Hi
The interference “front” turns out to be over the US rather than over the UK.
Power,
distance, and propagation all get into the “why”. The answer is that you get
crazy
fades and phase shifts as a result.
Bob
> On Dec 3, 2018, at 9:20 PM, Paul Bicknell wrote:
>
> Hi All
>
> There is a
Hi All
There is a 60 Khz frequency standard operating in the UK
So do the two signals interfere with each other?
Paul
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Tom
Van Baak
Sent: 04 December 2018 02:12
To: Discussion of precise time
Hi
Well, what you are coming up with as a result simply is not correct. Properly
calculated ADEV does not do what you show it doing. TimeLab has been around
long enough to be considered “correct” in this regard. The normal input to an
ADEV calculation is phase rather than frequency.
Bob
>
At long last, a complete WWVB 60 kHz BPSK dev board is available:
https://universal-solder.ca/product/everset-es100-cob-wwvb-60khz-bpsk-receiver-kit-with-2-antennas/
Note it includes the antenna(s). Also has links to documentation.
It would be very nice if a bunch of time nuts around the
I am starting with what should be a frequency measurement at the sample
rate. Timelab can import that and should be able to determine ADEV from
that. I agree that something is not right though. I unfortunately am trying
to measure with what I already have. I don't have a TIC.
Regards,
Mark
On
Hi
Let’s back up a bit:
The input to an ADEV calculation is a record of phase (time between wide spaced
edges). Often this is from a PPS output on a device. It could equally well be
from
10 MHz edges spaced a count of 10,000,000 edges apart.
The first part of the formula takes the difference
In message <0a9f6701-42d5-7553-8ea9-980899936...@intercat.com.br>, Luiz Alberto
Saba writes:
>1. Power supply. 24 V switched is OK or the classic
>transformer/bridge/huge capacitors/regulator is best?
A good switched PSU is better than a mediocre linear PSU these days.
>2. Heat. Do I
Hi people
I'm new on this list and miles below you.
I'm thinking of use a PRS10 with a LEA-6T providing 1PPS and a Raspberry
PI 3b+ with Lady Heather (2 instances, of course) to monitor/control
both devices.
Reasons for my request for your comments:
1. Power supply. 24 V switched is OK or
I have looked at it multiple times and so far cannot see a discrepancy. The
ration of the ADEVs for the two sample rates is very close to 2 for a wide
range of Tau in the 10-200 sec range. That can't be a coincidence. It's
between 2 and 3 for higher Tau but that may be due to temperature changes.
Hello
There are many alternatives to the Z12T. It all depends on your budget. I
am guessing that you want to establish legal traceability to your local
UTC, is that right?
Starting at the top end, you can buy complete systems from Dicom and
Piktime. These cost about $25K and $40K respectively.
Hi Dana:
I converted a stock 24 hour wall clock to sidereal time using a "Crazy Clocks"
module:
https://www.tindie.com/products/nsayer/crazy-clock/
http://prc68.com/I/QuartzClk.shtml#Sidereal
I gave it to the local latitude observatory
https://www.prc68.com/I/UkiahObs.shtml
and used the LMST
On Mon, 2018-12-03 at 08:42 -0500, Bob kb8tq wrote:
> https://www.thinksrs.com/downloads/pdfs/manuals/FS740m.pdfAnother
https://www.thinksrs.com/downloads/pdfs/manuals/FS740m.pdf
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Hi
Ok, if frequency is the only concern, then a fairly conventional GPSDO would do
the job.
One of many out there is the FS 740.
https://www.thinksrs.com/downloads/pdfs/manuals/FS740m.pdfAnother
There are a lot of others. The approach used is normally a very long comparison
( as in
weeks).
Hi
ADEV is pretty well documented and the results should *not* be dependent on the
sample rate. The proper approach to dropping the sample rate is decimation of
the
data. I think you may want to look at the way you are doing ADEV.
Bob
> On Dec 3, 2018, at 12:30 AM, Mark Goldberg wrote:
>
> I
Thank you for answer and sorry for delay. Purpose is simultaneous view of GPS
satellites with the french official time laboratory LNE SYRTE . The corrections
factors from the laboratory will enable to get with our high performance cesium
about 5. 10-13 . Today the cesium is running alone.
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