Assuming it does not snow again, should finish the cabling to the new
rooftop tripod and switch to the new antenna and splitter tomorrow.
For the LMR400 main run and jumpers is simple enough, will just measure.
That leaves the antenna and splitter, both have and amp and bandpass
filter and I
cbr...@woods.net said:
Anyone know what the delay for this amp and splitter is? Or better yet a
delay v.s. temp plot?
From:
http://www.symmetricom.com/link.cfm?lid=9017
Group delay: 40 ns typical.
There is a different version of the data sheet available at:
Hi Brooke,
I'm not sure I should have done that test as I scored 35. Hmmm...
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Brooke Clarke
Sent: 29 September 2012 14:11
To: Discussion of precise time and frequency measurement
Hi
Close in, it looks like it's pretty much the crystal and the loading of the
bridge oscillator.
Bob
On Sep 29, 2012, at 11:46 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
The E1938A uses a crystal that is basically the same as
the 10811 crystal except that it is in a reduced
We measured the delay on a couple of the splitters. I need to dig up the
results, but I think the delay is around 7ns in both the 2 and 8 port units,
and is pretty consistent port-to-port. I'll find the data and get it on the
pages at febo.com.
John
On Sep 30, 2012, at 2:51 AM, Christopher
Hi Rob:
For me it's been very helpful to understand myself.
Note this is not something to be cured it's just the way some people are and
the world needs those people.
There a book look me in the eye that's a true story about the guy who built
the special guitars for the rock group KISS.
Have
Found the data on the splitters:
http://www.febo.com/pages/lab_documentation/gps_cable_delay/hp_gps_splitter/
My recollection was a bit off -- we saw about 22ns on the two-port 58535a and
about 15ns on the 8-port 58517A. I would guess the 4-port unit would be
similar.
Unfortunately, I
I recently modified an old 10811 to bring out the crystal
leads on miniature coax (instead of having them connect
to the oscillator circuit). This allowed me to measure
the crystal's inherent flicker noise of frequency.
The measurements indicate that the 10811 phase noise out
to at least 100 Hz
j...@febo.com said:
My recollection was a bit off -- we saw about 22ns on the two-port 58535a
and about 15ns on the 8-port 58517A. I would guess the 4-port unit would be
similar.
Interesting that it's so far off from the 40 ns in the data sheet.
--
These are my opinions. I hate spam.
Rick it is really fantastic to see Time Nuts occasionally discuse different
aspects of products they actually designed. This form is really a treasure.
In the future it would be interesting to here how you would approach the next
quartz industry standard. The next generation Blue-Top or BVA.
I think the usually quote worse case.
Sent from my iPhone and Hunter Lambert is my hero!
On Sep 30, 2012, at 12:03 PM, Hal Murray hmur...@megapathdsl.net wrote:
j...@febo.com said:
My recollection was a bit off -- we saw about 22ns on the two-port 58535a
and about 15ns on the 8-port
Hi
….. any bets on it being a triple oven? :)
Bob
On Sep 30, 2012, at 1:26 PM, Tom Knox act...@hotmail.com wrote:
Rick it is really fantastic to see Time Nuts occasionally discuse different
aspects of products they actually designed. This form is really a treasure.
In the future it would
El 29/09/2012 19:11, Joe Leikhim escribió:
I would have to agree that a lot of engineer and tech types fall into
these categories. If not, we would probably not have and GPS
satellites, cellphones and supersonic planes.(where is my hoverboard?)
Not sure. Asperger is a type of autism, and
Don
Latham's law of horizontal surfaces states Any bare horizontal surface
immediately becomes covered with junk.
I would offer a more general law:
A N dimensional surface tends to attrack N+1 dimensional objects to the
saturation limit.
___
Would this characteristic be similar across all 10811s or would there be
as much unit to unit variation as there is for aging and Allan Deviation?
Ed
On 9/30/2012 11:03 AM, Richard (Rick) Karlquist wrote:
I recently modified an old 10811 to bring out the crystal
leads on miniature coax
Interesting that it's so far off from the 40 ns in the data sheet.
I think the usually quote worse case.
Both data sheets said typical.
Worst case makes sense for things like delays through digital gates where you
have to add up the total delay to see if your design will meet timing. But
I only measured one 10811. However, John Vig's tutorial
(available at IEEE UFFC) rather categorically states that
piezoelectric resonators have flicker noise of frequency.
What I measured was most closely related to phase noise,
as opposed to Allan Deviation. Phase noise of 10811's is
more
With a warmed up tbolt and Lady Heather it is perfectly possible to
measure/watch the delay by swapping the splitter in and out of the
antenna cable chain.
--
Björn
Interesting that it's so far off from the 40 ns in the data sheet.
I think the usually quote worse case.
Both data sheets
On 09/30/2012 09:49 PM, Richard (Rick) Karlquist wrote:
I only measured one 10811. However, John Vig's tutorial
(available at IEEE UFFC) rather categorically states that
piezoelectric resonators have flicker noise of frequency.
What I measured was most closely related to phase noise,
as opposed
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low have you seen, I have the opportunity
to test 40+ units and hope to find a few even better ones. Any guidance will
be appreciated.
My best reference is 3 E-13 so any thing as
Bert,
When you do tests like this, how long do you let the oscillators settle prior
to testing?
Doc
Sent from my iPad
On Sep 30, 2012, at 4:23 PM, ewkeh...@aol.com wrote:
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low
Doc
The units I mentioned have been done by Corby, but I let units run two
weeks before I do any test. In the future when I do the 40+ two a week running
parallel and the best rerun after 4 week soak.
Bert
In a message dated 9/30/2012 7:55:43 P.M. Eastern Daylight Time,
On 9/30/2012 2:20 PM, Magnus Danielson wrote:
With two such offset 10811s you could use DMTD methods or for that
matter cross-correlation phase noise measures to more directly measure
the units. That way you would have avoided the golden unit issue,
since the phase noise of those would
Sorry I have never seen those statistics.
Rick
On 9/30/2012 2:23 PM, ewkeh...@aol.com wrote:
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low have you seen, I have the opportunity
to test 40+ units and hope to find a few even
Hi,
Thanks for all the good advice to get me started in this fun technology!
Last weekend finished putting up the antenna that was obtained from the
suggested China source,
powered up a new to me Trimble Thunderbolt, obtained an old used laptop w/
DB-9 serial HW,
and have been experimenting
I have a corby ocxo (datum-c) that I am coupling with a fury oem board soon
(need some connectors). I wish someone with good measurement equipment lived
nearby. I would like to measure this vs my standard fury. I think the ocxo is
mid 10-13 at 1s. Anybody near Kansas City?
Doc
Sent
I would like to experiment with some other OCXO's, but am not sure about how
they might be disciplined.
Almost all of them have just a just pins on their connector, ground,
power (one or two voltages) and control with is a variable voltage
to apply and the ooutput frequency varies over a small
On 10/01/2012 02:05 AM, Richard (Rick) Karlquist wrote:
On 9/30/2012 2:20 PM, Magnus Danielson wrote:
With two such offset 10811s you could use DMTD methods or for that
matter cross-correlation phase noise measures to more directly measure
the units. That way you would have avoided the
On 10/01/2012 02:11 AM, Frank Hughes wrote:
Hi,
Thanks for all the good advice to get me started in this fun technology!
Last weekend finished putting up the antenna that was obtained from the
suggested China source,
powered up a new to me Trimble Thunderbolt, obtained an old used laptop w/
Hello Nuts,
Just saw this mentioned in Circuit Cellar, just wonding if it really
exists, how much they are asking, and if anyone has played with one
yet?
http://www.rfx.co.uk/pdfs/GPS_OCXO_1300_10_module.pdf
Regards,
Skip Withrow
___
time-nuts
Offhand I can not think of any reason it could not exist but if you
have to ask for the price, then I suspect it will be too expensive.
On Sun, 30 Sep 2012 19:40:47 -0700, Skip Withrow
skip.with...@gmail.com wrote:
Hello Nuts,
Just saw this mentioned in Circuit Cellar, just wonding if it really
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