Hi Volker,
What is being plotted here? Efc? Time interval as reported by the GPSDO?
External counter versus a stable reference?
It looks like the resolution is approaching 10ns/s (1E-08 at 1s), and that the
short term effects may be hidden in this noise?
The effects are clearly visible in your
Although I am dog-tired it gives me no peace...
I come to the following conclusion:
- The long term Allan deviation gets worse, as long, as the effect of
EFC compensating is in the range of tau
- But: It gets back to its normal value after that
- The short term deviation, however, increases s
Diagram 2 shows the MDEV values of my GPSDO varying over the time, due
to blowing air at the OCXO - not the frequency of an OCXO. I'm still
hoping, that my MDEVs do not age :-)
Am 22.12.2012 04:00, schrieb Bob Camp:
Hi
In most cases, when you see an OCXO (or TCXO) begin to rise past a few
Please read through the release note comments at the start of the heather.cpp
file in your Lady Heather installation directory for some info on the temco and
drift calculation features.
The drift numbers assume either a constant temperature or a decent DOXCO that
is not affected by temperature
Hi
In most cases, when you see an OCXO (or TCXO) begin to rise past a few thousand
seconds, you are either looking at aging or the room temperature.
Bob
On Dec 21, 2012, at 9:54 PM, Volker Esper wrote:
> Here come the curves...
>
> You'll find two diagrams. The first (named "1_DF9PL...") sho
Hi Mark,
Makes sense, I think the 5370A should be good to 30ps rms or so, so one would
think things could be about 2x to 3x better in your plots.. Its hard to get
much better without going high-end such as the Miles Timepod etc.
Bye,
Said
Sent From iPhone
On Dec 21, 2012, at 11:05, Mark Spenc
In message
, David Kirkby writes:
>On 21 December 2012 18:11, Chris Albertson wrote:
>That said, some of the code that people release, and gets
>circulated annoys me. Take a look at this unix shell script,
I wrote something about that for ACM:
http://queue.acm.org/detail
Hi Fabio,
On 12/21/2012 01:43 PM, fabi...@quipo.it wrote:
Hello, while waiting fot the final doom, or a new
job (tough times here) here is another update of
the work I'm doing, sorry for the looong mail,
hope I'm not boring the readers.
I have a question about a some measurements I
made, and I'
John
I send my posting to Mrs. Stoll for approval prior to posting. Lets try
not to start the usual arguments. Brooks deserves better.
Bert Kehren
In a message dated 12/21/2012 4:28:38 P.M. Eastern Standard Time,
j...@febo.com writes:
And folks, please respect Brooks' privacy -- remembe
Though the $35 special is only good for 1 unit per person,
Synergy offers a 10% educational/ham radio/experimenter discount for
additional/subsequent units
bringing the price to around $63 for time-nuts who need more than 1. I'm
thinking the other unit they have announced (without the PIC) shoul
Thanks to all who replied with that part number. Come to think of it, if
anyone has any (moderately high-res) photos of the front and back of the board,
those would be great to see as well.
73,
Brent, KD0GLS, Minneapolis
On 21 Dec 2012, at 15:06, Dale J. Robertson wrote:
> PIC is a PIC24FJ64G
And folks, please respect Brooks' privacy -- remember that this list is
archived in many places on the web.
John
paul swed said the following on 12/21/2012 04:06 PM:
Kind of defocusing here. I think the thread is about possibly helping to
release the shera v4.02 software. Several folks app
Hi Brent: It's a PIC24J64GA, with 25AA256 external flash, and an AC00
glue chip. The resonator or crystal is apparently 184 A KOX (or K0X),
couldn't get more on it.
Apparently ancient memory did not serve me well about replacing the
ONCORE. As noted earlier by a TN, Synergy may make a piggyback boa
Kind of defocusing here. I think the thread is about possibly helping to
release the shera v4.02 software. Several folks appear to be local to
Brooks wife and may be able to help her recover information she may need in
general and if we are lucky allow the software to be at least gathered.
Regards
PIC is a PIC24FJ64GA-004-I/PT
Sent from my iPhone
On Dec 21, 2012, at 2:20 PM, KD0GLS wrote:
> I'm looking at Synergy's Tech Note #493 for the SSR-6Tr and trying to make
> out the part number of the PIC from the picture. Looks like it might be a
> PIC24F part. Would appreciate knowing the
On 21 December 2012 18:11, Chris Albertson wrote:
> I think whatthis says is that if you've worked hard to make a design
> available to others and you don't intend to sell it commercially,
> PUBLISH the details, the design files and the source code. Yes I
> kknow it is never "good enough" for ot
Mark,
Could you please post a photograph of your experiment?
Thanks
Volker
Am 21.12.2012 20:05, schrieb Mark Spencer:
Said, not sure where the noise is coming from but I suspect it's from the MV89
OCXO itself which was only powered up for 10 hours when the data was collected.
The BVA refe
I'm looking at Synergy's Tech Note #493 for the SSR-6Tr and trying to make out
the part number of the PIC from the picture. Looks like it might be a PIC24F
part. Would appreciate knowing the actual part number from one of you who's
already received your board.
73,
Brent, KD0GLS, Minneapolis
Said, not sure where the noise is coming from but I suspect it's from the MV89
OCXO itself which was only powered up for 10 hours when the data was collected.
The BVA reference and the counter (an HP5370B) have performed significantly
better on other occasions. When I have some time over th
Had a good conversation with Art Slepin at Synergy. He said, if my
ancient memory serves, that the PIC on the new board will be available
for programming, and that it might be possible to do an ONCORE as a
software conversion from the UBLOX to the output connector. Just who is
going to do this, not
> How did he set up the video? What camera?
The Rigol DS4024 Scope has a "Record" Function.
Basically it stores internally a screen capture for each trigger event.
Therefore the Scope itself "takes a picture" once a second when triggered
by PPS events.
You can then set the Scope to "Replay" the
Vibration: interesting consideration. In my experiment the fan is very
softly coupled to the case (since it is lying on some soft cables),
furthermore the power supply is a different one - not the one that
powers the Z3805. I've tried to avoid those effects. I send some ADEV
plots in an hour.
How did he set up the video? What camera?
Sorry, I lost the original message.
Regards,
Tom
- Original Message -
From: "paul swed"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, December 20, 2012 9:55 AM
Subject: Re: [time-nuts] A Day in the Life of Five
...and we do not know how much air flow and how turbulent each of us
applied. We can only give an _idea_ of what happens and in which order
of magnitude it could be.
When Stu started the thread (elderly time nuts can surely recall) his
question was about cooling a Z38xx unit. I recommended b
I just had this same problem, a computer owned by some one who had
passed away. One dose not even need to know or recover the password.
Simply remove the hard drive and place it on another computer and you
will have access to all the files, copy over what is needed, re-format
the drive, then put i
Mark,
Your plot still shows excursions of +/-1E-010, about 100x higher base noise
than the Z3801A/Z3805A are capable of achieving. Wonder where that noise is
coming from? This noise is probably much higher than the thermal effects.
The original post was the question "does my Z380xA have reduced
Hi Bob,
I agree that the HUP is basically determined by the OCXO, but the GPS is
the reference that the OCXO is compared to when determining the HUP. So
it seems reasonable to ask if a better GPS will improve the HUP numbers.
Even with the flaky receiver, my Z3801A was producing 1 PPS signal
Great plots guys!
Looking at these results I think my original claim still holds: ADEV goes up
when a fan is involved versus no fan, even on a double oven 10811..
Clearly visible on the 10811, maybe not so much on the MV89 but that unit seems
to have frequency moves into the xE-010 region on Ma
Funny
My 3801 has been working fine. But I had read on time-nuts the issues with
the flaky rcvr and thats why I became interested. The 3801s are getting
pretty old. I had to change a 6sk7 in the pre-amp. ;-)
Regards
Paul
WB8TSL
On Fri, Dec 21, 2012 at 12:00 PM, Ed Palmer wrote:
> Since I have a
Rick,
Good job on this effort!
Is there any document of the differences between the m12 and SSR-6T behavior on
the comm interface? Are all m12 commands implemented for example? Are things
like UTC offset implemented?
Thanks,
Said
Sent from my iPad
On Dec 21, 2012, at 8:26 AM, "W2GPS" wrote:
Hi
The holdover uncertainty prediction is far more a function of your OCXO than of
the GPS.
Bob
On Dec 21, 2012, at 12:00 PM, Ed Palmer wrote:
> Since I have a Z3801A this is an interesting development. Do you expect to
> see improved performance or is this simply to replace a dead VP rece
Since I have a Z3801A this is an interesting development. Do you expect
to see improved performance or is this simply to replace a dead VP
receiver and bring the Z3801A back to life?
My 6 channel VP receiver was flaky so I replaced it with an 8 channel
model. My Holdover Uncertainty Predicti
Art?
If $35 I am in.
Paul
WB8TSL
On Fri, Dec 21, 2012 at 11:26 AM, W2GPS wrote:
> Tom,
>
> Synergy already has a carrier board to put the SSR-6T receiver into a VP,
> UT,
> UT+, etc. socket. All that is needed is firmware support for the old
> 8-channel
> messages. I am planning to implement thi
Tom,
Synergy already has a carrier board to put the SSR-6T receiver into a VP, UT,
UT+, etc. socket. All that is needed is firmware support for the old 8-channel
messages. I am planning to implement this capability for Synergy. It's just a
matter of time and priorities. Eventually Synergy will hav
Thanks
On Fri, Dec 21, 2012 at 11:15 AM, Tom Van Baak wrote:
> Hi Paul,
>
> I'm pretty sure the hp Z3801A and 58503A/B (and perhaps other 1990's era)
> GPSDO use the Motorola Oncore VP receiver. It was, and still is, a famous
> GPS timing receiver. Later, many GPSDO evolved to use the Motorola/i
FWIW I've combined all 3 parts into one PDF and put them on KO4BB's great
website. Look in Manuals 10) Recent Uploads for "Reference na na Other-EDN
article SuccessfulPCBgrounding". Since my PDF did not have working links I used
a zip file with a Word doc for the links.
Another article that may
Hi Paul,
I'm pretty sure the hp Z3801A and 58503A/B (and perhaps other 1990's era) GPSDO
use the Motorola Oncore VP receiver. It was, and still is, a famous GPS timing
receiver. Later, many GPSDO evolved to use the Motorola/iLotus M12 receiver.
The new Synergy SST-6T is a clever combination h/w
Simon,
Welcome to the list!
Since I'm working on grounding problems for some 20 years I can confirm
this an important issue. Many of my engineer colleagues do not have a
clue about it. The article you recommended describes the thing very
clearly. I will recommend it my colleagues and use it
I have send an email and will find out what help she would accept, but
there is time when a snail mail is very powerful, and I again encourage all of
you to take the time to write a snail mail note. Maybe he can still
recognize it, but putting my self in Karen's place it will lighten her load
I will contact her and see mybe she may also need help to dispose of
hardware and we can arrange a sale.
Bert
In a message dated 12/21/2012 9:15:56 A.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Bert
A thought has crossed my mind here.
His wife can not access his computer.
If its
Ditto on that. I'm up in Los Alamos. Getting into computers is my
specialty.
-Bob
On Fri, Dec 21, 2012 at 7:29 AM, Kevin Rosenberg wrote:
> If needed, I can provide some local help. Karen's address is a
> short drive from my home.
>
> Kevin
>
> On Dec 21, 2012, at 7:15 AM, paul swed wrote:
>
If needed, I can provide some local help. Karen's address is a
short drive from my home.
Kevin
On Dec 21, 2012, at 7:15 AM, paul swed wrote:
> Bert
> A thought has crossed my mind here.
> His wife can not access his computer.
> If its windows XP or earlier the password is recoverable. I use a b
He worked at LANL. Might be other stuff in there...
On Fri, Dec 21, 2012 at 9:15 AM, paul swed wrote:
> Bert
> A thought has crossed my mind here.
> His wife can not access his computer.
> If its windows XP or earlier the password is recoverable. I use a boot cd
> that exposes all. Its been helpf
Bert
A thought has crossed my mind here.
His wife can not access his computer.
If its windows XP or earlier the password is recoverable. I use a boot cd
that exposes all. Its been helpful.
Is there a way to reach out and offer help aside from snail mail?
Would she be open to that help?
Regards
Paul
Hi Fabio,
I am not crazy about your 10 MHz input circuit. You might want to consider
investigating John Miles input arrangement at the following web site:
http://www.ke5fx.com/ac.htm
I used it to drive an input to a divider chip without the output resistor or
capacitor.
BillWB6BNQ
fabi..
On 12/20/12 11:16 PM, Hal Murray wrote:
Can you create an executable for windows?
I know next to nothing about Windows. (and don't have access to any Windows
machines)
Others have reported that Python works on Windows.
I use python all the time on Windows (and unchanged from Python running
Hi
I think I would grab some sort of USB thermometer and start logging the room
temperature.
CMOS input op-amps are a pretty good way to buffer the integrating capacitor.
They are cheap and have very low bias currents.
Bob
On Dec 21, 2012, at 7:43 AM, fabi...@quipo.it wrote:
> Hello, while
Hello, while waiting fot the final doom, or a new
job (tough times here) here is another update of
the work I'm doing, sorry for the looong mail,
hope I'm not boring the readers.
I have a question about a some measurements I
made, and I'd like an opinion about a frontend
schematic I designed.
Fi
I'm new to the list so this may have been mentioned before. An excellent series
on grounding devoted to mainly PCB issues but the thinking is universal:
http://www.edn.com/design/analog/4394761/Successful-PCB-grounding-with-mixed-signal-chips---Part-1--Principles-of-current-flow
There are 3 pa
Hi
The other question would be - what libraries (if any) are used by the code? If
any are they windows compatible?
Bob
On Dec 21, 2012, at 2:16 AM, Hal Murray wrote:
>> Can you create an executable for windows?
>
> I know next to nothing about Windows. (and don't have access to any Windows
Yes, I made such a setup, it's now running 22 hours. I'll post the
results in two hours or so (if nothing evil happens to the earth,
meanwhile).
Volker
Am 21.12.2012 03:35, schrieb saidj...@aol.com:
Wish I had more time to play with this setup.
How about fellow time nuts spend some time a
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