Yes, I'm hoping that it just wants a dummy string to say GPS is ok, and doesn't
actually use any information in it. If that's the case, code can be developed
for PIC and AVR that will work for just about anyone, using a ~$1 chip.
Even if the string does need to contain real GPS info, it should
Hi
If that data is correct, then the 10811 you have is defective.
Bob
Well... some of the data is reasonable for a scenario where a counter is being
used to measure OCXOs.
Looking at the ADEV plot, I'd say the blue trace (HP105B vs 5065A) is the most
questionable one if it came from a
Hi Bob,
The use of the PIC for WWVB carrier/data detection was only ever
intended for use with a visual clock, thus uncertainty (e.g. lag, delay
or whatever you want to call it) was par for the course in the
implementation that I described.
On 8/7/2015 3:51 AM, time-nuts-requ...@febo.com
Hello Ludwig,
I live about 280 km from Sylt, and receive the Loran-C transmitter with
nice noise margin figures reported by the Stanford FS700. Presently, I
use an untuned loop antenna to receive the signal, as described in a
previous thread, but I have also used an E-field antenna. The nice
Hi
Well an un-stated assumption of mine was that they all came from the same
measurement system and that it
had the same floor under all circumstances….
Bob
On Aug 7, 2015, at 5:21 PM, John Miles j...@miles.io wrote:
Hi
If that data is correct, then the 10811 you have is defective.
Hi
Here’s a quick and dirty approach to getting a Z3812A, KS-24361 L101, RFTG-u,
Ref-0 box
up and running on it’s own.
==
First P1 the +24VDC input. It’s a male 9 pin connector. The pins are all
labeled on the connector.
The numbers are small, but they are
On Fri, Aug 7, 2015 at 6:06 PM, paul swed paulsw...@gmail.com wrote:
Looking forward to the notes.
Yes it could be fairly simple if what ref 0 wants is a string that
essentially says the system is fixed with 3 d accuracy. Perhaps after that
the ref 0 makes no checks other then the string keeps
Dan exactly my thinking.
I will guess it wants the string that says I have a 3d position lock.
Something like @@ and 30-40 characters that would be fixed.I think there is
a CRC at the end. But all of the message can be copied from a real oncore
or simply monitor what comes out of the KS GPS unit.
Looking forward to the notes.
Yes it could be fairly simple if what ref 0 wants is a string that
essentially says the system is fixed with 3 d accuracy. Perhaps after that
the ref 0 makes no checks other then the string keeps coming with the
correct quality. Not to push a particular proc but any
kb...@n1k.org said:
A ~$30 FPGA card plus an MCU would be massive overkill. It would also be
fairly easy to do. A similarly priced ARM board from any of a dozen outfits
*might* do the trick.
...
Could you get away without this or that? Who knows. There isnât enough cost
in any of those
If anyone is really interested in an SDR WWVB receiver project, TAPR has
a fairly large quantity of boards left over from a previous project that
use a very high performance 192ksample sound card chip (AK5394) in a
carefully laid-out design with no filtering (I believe the inputs are
also DC
Hi Luciano. That is interesting. Thanks for sharing this.
I also have an HP105B with the old style oscillator. (An auction site purchase
from years ago.) Yours seems at bit better than the one I have at tau's of
approx 100 seconds or so. I'm curious if you have any data for longer tau's ?
Bob wrote:
Well, at least *some* of the chips out there do
not make it to 96 KHz when sampling at 192 KHz. Its
been a few years since I dug into them. Back
then a chip that had an internal filter that went to 96K
was very much the exception rather than the
rule. If the only point of 192K is
I picked up yet another version of a GPSDO on Ebay the other
day. I thought that I'd mention this because sometimes when
one unit shows up there are a lot more that will be listed
for sale later, like with the many Lucent RFTG units that
are currently being sold on Ebay.
This one is a Symmetricom
alex...@ieee.org said:
but for a very long time we get --or better to say got in the past -- the
correct number of periods of the line frequency, I have two clocks side by
side -- one driven by the power line the other is an atomic clock from
Westclox guided by WWVB and the seldom
Thanks, Bob. Would it make sense to also upload it to KO4BB's site?
John K1AE
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
Sent: Friday, August 07, 2015 10:14 AM
To: Discussion of precise time and frequency measurement
Subject: Re:
Hi
You need to get the Oncore running with the correct position locked in and
spitting out the right strings.
That’s all done by the CPU in the REF-1 unit. The REF-0 simply grabs the data
off of the string
as it comes by.
I’ll see if I can dig out the information and send it to you off list.
Hi
People got a bit “excited” about the level of KS box discussions. All of the
work decoding
the 15 pin connector and how to drive the REF-0 was taken off list.
Simple answer:
Yes you can run a REF-0 by it’s self. It needs a dummy string that looks like
the output
of a Motorola Oncore to
Thanks.
I have some Motorola Oncore available.
Can you detail this fairly simple manipulation of the signal lines?
Regards,
Edésio
On Thu, Aug 06, 2015 at 09:57:20PM -0400, Bob Camp wrote:
Hi
People got a bit ???excited??? about the level of KS box discussions. All of
the work decoding
I have 2 austrons going and the fs700.
One austron on wildwood and the other used for dana.
As you say no luck.
Just remember they are trying to bring dana online after 5 years.
That in itself should be quite a task. Imagine a 600 ft antenna, tuning
coils and transmitter. Kind of a Frankenstein.
Hi Luciano,
Thanks for that plot. In general an ADEV plots shows more succinctly the
differences between oscillators than the raw phase and frequency plots that you
posted earlier. The jitter and wander of your phase plots give a hint, but an
ADEV plot neatly summarizes all this with
Bob there is enough interest you may want to resend it here.
Just a thought.
Paul
WB8TSL
On Fri, Aug 7, 2015 at 5:24 AM, Graham planoph...@aei.ca wrote:
Bob,
I would like that information too please and thank you.
I have a pair that is working quite well and I also have a second REF-0
that
Hi Bob,
I also grabbed some of the KS-24361 pairs and retrieved a
lot of information from the mailng list archive.
If you have more results from the reverse engineering which
was already done, I´d also be very interested.
Thanks,
Matthias
Hi
You need to get the Oncore running with the
In the past, a number of kind time-nuts have offered to assist with
issues related to list administration. I could now use some of that help.
For a long time, I have been trying to find and resolve the cause of
persistent delays in some email messages routed through the list server
at
Hal Murray hmurray@... writes:
Also the carbon composition resistor drifted with time at elevated
temperature.
I assume the drift is slow enough so that any any control loop will
easily
track it.
Actually, ageing is a better word than drift. After the major change
in resistance due to
Hi
The outer oven in the 3801 was put there for a very specific purpose:
When the 3801 was designed, they had a target specification that included a
warmup from -40C.
The 10811 was never designed to work at these temperatures and simply could not
meet the
required warmup time.
The
Hi
Ok, I will write something up and post it here. It will probably take a few days
to get it all into a form that answers most of the questions.
What you will need:
1) A working REF-0
2) A PIC or other micro to get things going
3) A GPS with a PPS output (any will do)
4) Code specific to your
In message 55c4366f.4050...@telekabel.at, Ludwig Puller writes:
some time ago a gentlemen living only some hundred miles from Sylt
reported in the net about loran C reception coming from Sylt. I could not
find his report in the net. I want to talk to him about this subject.
That might
In message 55454.1438931...@timeok.it, tim...@timeok.it writes:
For example I found a 10811 mounted in a Z3801A who have the
temperature set-point completely wrong.
The turn-over temperature can shift rather dramatically if the
X-tal is subjected to large mechanical shocks. This
Just to follow up, the catalog is now available for download on KO4BB. It is
listed under Misc Test Equipment - Austron.
Happy reading.
Dan
On Jul 26, 2015, at 4:23 PM, paul swed paulsw...@gmail.com wrote:
I don't think there is one. Watch out there is one located I believe on a
Chinese
Hi
If that data is correct, then the 10811 you have is defective.
Bob
On Aug 6, 2015, at 11:37 PM, tim...@timeok.it wrote:
here the ADEV of the two oscillator. I have added the Super performance of an
HP105B (old oscillator) bought in an Ham fest.
Luciano
On Fri 07/08/15 03:37
kb...@n1k.org said:
Well, at least *some* of the chips out there do not make it to 96 KHz when
sampling at 192 KHz. Itâs been a few years since I dug into them. Back then
a chip that had an internal filter that went to 96K was very much the
exception rather than the rule. If the only point
a software demodulator for the DCF77 was published last year, the DCF77
has similar modulation structure as the new wwvb it was developed at a
Swiss company
73
KJ6UHN
Alex
On 8/6/2015 3:11 PM, Donald wrote:
I have found this old posting from 2014:
On 2015-08-04 21:36, Hal Murray wrote:
kb...@n1k.org said:
So far there have not been any home brew design radios show up that will
demodulate and lock to the new data format. There is plenty of info on the
transmit format. The demodulation approach is not crazy hard. That said,
there’s
Subject: reception of loran C from Sylt
Hi all,
some time ago a gentlemen living only some hundred miles from Sylt
reported in the net about loran C reception coming from Sylt. I could not
find his report in the net. I want to talk to him about this subject. I
live in Vienna/Austria and have a
Hi Bob I would also like to get the information on how to use the REF-0, I have
one on the way
Thank you Gary vk2kyp
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
Sent: Friday, 7 August 2015 12:40 PM
To: Edesio Costa e Silva
Cc: Discussion
Bob,
I would like that information too please and thank you.
I have a pair that is working quite well and I also have a second REF-0
that I want to start testing but just haven't got round to it yet to
figure out what is needed.
cheers, Graham ve3gtc
On 2015-08-07 02:39, Bob Camp wrote:
Hi Corby,
I agree with you that if selected, there may be many differences between
objects of the same type. Unfortunately it is very difficult to know what is
selected and what is not. For example I found a 10811 mounted in a Z3801A who
have the temperature set-point completely wrong. I
here the ADEV of the two oscillator. I have added the Super performance of an
HP105B (old oscillator) bought in an Ham fest.
Luciano
On Fri 07/08/15 03:37 , Bob Camp kb...@n1k.org wrote:
Hi
HP 10811’s vary over almost a 100:1 range in terms of ADEV performance
at short tau. The
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