Once 9 Jan 2017 12:59, "Bob Camp" wrote:
>
> Hi
>
> Ok here are some rough numbers:
>
> > On Jan 9, 2017, at 4:35 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkir...@kirkbymicrowave.co.uk> wrote:
> > It would be interesting to see your breakdown of the costs and man hours
> > for an H2 maser.
This might be of use/interest for a GPS distribution amplifier:
http://huprf.com/huprf/wp-content/uploads/2016/03/DA1-4-Manual-V2_03.pdf
On 09/01/2017 23:27, Bob kb8tq wrote:
> Hi
>
>
>> On Jan 9, 2017, at 6:06 PM, Jay Grizzard
>> wrote:
>>
>> Does anyone know of any schematics for amplified G
HI Bob & Clint,
If you look at the second message of this thread, I attached the manual
that applies to Option 58. Look at PDF page # 16 and you will see that
there is no DDS in the physics package. The DDS is only used down
stream in some variations of the product such as the Option 58 bein
Yo Tom!
On Mon, 9 Jan 2017 16:37:27 -0800
"Tom Van Baak" wrote:
> Your ADEV plots differ from mine by orders of magnitude.
You are right, my ADEV plots are junk. Removed.
It was the 24 hour scatter plots that I wanted you to look at.
Hard to argue with lat/lon data as reported by the device.
Hi Gary,
Your ADEV plots differ from mine by orders of magnitude. Remember this is
time-nuts, not an NTP or a GPSD forum. The Adafruit GPS board is fine, even
fantastic. But I suspect there are issues with your measurement techniques.
I'm happy to help, but let's take this off-list.
Thanks,
/t
> We almost always calculate and plot AVAR.
I mean we almost always calculate and plot ADEV.
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Hi Jeremy,
> the 5360A "Computing Pig"
> I've never figured out the difference.
See the top of page 11 of
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1971-11.pdf where it says:
"Fractional frequency deviation is the term used to describe the frequency
instabilities of a source in the
Hi
> On Jan 9, 2017, at 6:06 PM, Jay Grizzard wrote:
>
> Does anyone know of any schematics for amplified GPS splitters floating
> around out there? I looked a while back and couldn't find anything. I use a
> 58536A right now, but it's big and I hate having to have N to SMA cables. It
> wou
Hi
> On Jan 9, 2017, at 5:09 PM, Jeremy Nichols wrote:
>
> In the late 1960s, Hewlett-Packard engineers worked up a program to have
> the 5360A "Computing Pig" (so-called from its weight, 55 pounds without
> plug-ins) compute a "fractional frequency standard deviation." It appears
> to be simila
> A number of outfits were measuring and spec’ing short term stability in the
> 1950’s and early 1960’s.
For "ADEV" in the 1950's -- follow the words in yellow [1]:
http://leapsecond.com/pdf/1953-Quartz-Greenwich.pdf
For "ADEV" in the 1930's -- I've seen similar treatment done by precision
pen
David
Many thanks for your help, I have downloaded all three items, my 58503 is an
A, I had no idea that a B model existed ! Mine has the front panel
display, which is very bright suggesting that it had not been used for very
long periods. The unit was in overall VG condition when I received
Does anyone know of any schematics for amplified GPS splitters floating
around out there? I looked a while back and couldn't find anything. I
use a 58536A right now, but it's big and I hate having to have N to SMA
cables. It would be awesome to be able to roll my own with all the
connectors I
Or batch to batch?
If I get a unit of type A and another of type B and run some tests and conclude
that A is better, will you get the same results if you try to repeat my tests?
Will we get the same results if we swap units, that is run my tests at my
location and with my setup using your rec
In the late 1960s, Hewlett-Packard engineers worked up a program to have
the 5360A "Computing Pig" (so-called from its weight, 55 pounds without
plug-ins) compute a "fractional frequency standard deviation." It appears
to be similar to the Allen Deviation; I've never figured out the difference
and
Yo Tom!
On Mon, 9 Jan 2017 14:01:18 -0800
"Tom Van Baak" wrote:
> Hi Gary,
>
> > Clearly the Adafruit is not high accuracy. I have played with some
> > short baseline DGPS (cm level data) and not found any issue with
> > antenn separation.
>
> I'm surprised by your claim. My measurements sh
Hi Bob,
On 01/09/2017 11:00 PM, Bob kb8tq wrote:
Hi
On Jan 9, 2017, at 4:49 PM, Magnus Danielson wrote:
Scott,
On 01/09/2017 07:41 PM, Scott Stobbe wrote:
I could be wrong here, but it is my understanding that Allan's pioneering
work was in response to finding a statistic which is converge
Hi
> On Jan 9, 2017, at 4:49 PM, Magnus Danielson
> wrote:
>
> Scott,
>
> On 01/09/2017 07:41 PM, Scott Stobbe wrote:
>> I could be wrong here, but it is my understanding that Allan's pioneering
>> work was in response to finding a statistic which is convergent to 1/f
>> noise. Ordinary standa
Hi Gary,
> Clearly the Adafruit is not high accuracy. I have played with some
> short baseline DGPS (cm level data) and not found any issue with antenn
> separation.
I'm surprised by your claim. My measurements show that the Adafruit is a
wonderful GPS receiver. Attached are ADEV MDEV TDEV plo
Scott,
On 01/09/2017 07:41 PM, Scott Stobbe wrote:
I could be wrong here, but it is my understanding that Allan's pioneering
work was in response to finding a statistic which is convergent to 1/f
noise. Ordinary standard deviation is not convergent to 1/f processes. So I
don't know that trying t
g...@rellim.com said:
> Care to recommend any that have SMA connectors? I have found that a 3dB
> difference in antenna can degrade my data quality, it would be interesting
> to see how the 3dB loss of the splitter affects thins.
There are 2 options for splitters. One is to use cable-TV splitt
Hi Gary,
>> >> My gut reaction is that "coupling" between the two antennas may
>> >> have some effect on some of the variation.
>>
>> For high accuracy applications, I have been given the advice to keep
>> GPS antenna separation much higher. 1 meter separation was suggested.
>
> Clearly the Adafru
Yo Björn!
On Mon, 9 Jan 2017 07:45:00 +0100
"Björn Gabrielsson" wrote:
> >> My gut reaction is that "coupling" between the two antennas may
> >> have some effect on some of the variation.
>
> For high accuracy applications, I have been given the advice to keep
> GPS antenna separation much hi
Option 58 in a FE Rb is an additional sub board which has nothing to do
with the physics package control loop.
In an option 58 Rb there are two DDS chips.
On 9 January 2017 at 17:48, Scott Stobbe wrote:
> It very well could be. Based on Marks comments, it sounds like the DDS tone
> after bei
On Mon, 9 Jan 2017 13:41:34 -0500
Scott Stobbe wrote:
> I could be wrong here, but it is my understanding that Allan's pioneering
> work was in response to finding a statistic which is convergent to 1/f
> noise. Ordinary standard deviation is not convergent to 1/f processes. So I
> don't know tha
I could be wrong here, but it is my understanding that Allan's pioneering
work was in response to finding a statistic which is convergent to 1/f
noise. Ordinary standard deviation is not convergent to 1/f processes. So I
don't know that trying to compare the two is wise. Disclaimer: I could be
tota
Hoi Tom,
On Wed, 4 Jan 2017 16:26:22 -0800
"Tom Van Baak" wrote:
> I've never quite understood the pedantic separation of "sample" and
> "population" mean that statistic textbooks and academics love to discuss.
For me it's a matter of being exact. If there is one thing I've learned
in the last
God kväll Magnus,
On Wed, 4 Jan 2017 22:13:04 +0100
Magnus Danielson wrote:
> > My question is two-fold: Why is (n) being used even though it's known
> > to be an biased estimator? And why do people not use s when using (n-1)?
>
> First off all, you need keep number of phase samples (N) or numb
It very well could be. Based on Marks comments, it sounds like the DDS tone
after being squared up is directly driving a 23-bit counter for the 1 PPS
output.
On Mon, Jan 9, 2017 at 12:17 PM, Bob kb8tq wrote:
> Hi
>
> In most Rb’s (including the FE 56xx’s) the DDS is mixed with a fixed
> microwav
Hi
In most Rb’s (including the FE 56xx’s) the DDS is mixed with a fixed microwave
frequency signal. The DDS only has to make up “part” of the total offset. You
get
roughly a three orders of magnitude improvement because of this. Rick has gone
into all the gory details of why it gets done this wa
A 32-bit DDS synthesizing at 1/5 Fs, yields a tuning resolution of ~ 1 ppb.
So, I would imagine a slightly lower frequency is programmed into the DDS
and the c-field is trimmed to yield a higher precision. If the new
synthesized tone you wish to generate is an integer number of DDS codes you
could
Hi
Ok here are some rough numbers:
> On Jan 9, 2017, at 4:35 AM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> On 8 Jan 2017 17:34, "Bob Camp" wrote:
>
>> You are talking about a project that will take many years and likely
>> more money than the price of a new home. If that is “fun
Hi
> On Jan 9, 2017, at 1:05 AM, Bruce Griffiths
> wrote:
>
> For a rubidium vpour standard a cavity is essential, one could always use a
> microwave horn to illuminate the cell in an anechoic chamber.
The cavity in an Rb is not the ultra high Q monster that you have in a Maser.
There is
n
Bob, Dave,
The most big problem is to find a group of relatively close people with the
will to spend many hours, months for this project.
Here in Italy I found some people who work in public university who are
available to give external help, for example they were
given a Pirani sensor and th
On 9 January 2017 at 10:44, Roy Phillips wrote:
> I would be grateful for an answer to this question, as I also have a an HP
> 58503 - is the manual for the instrument available for download ?
> Thank you
> Roy
>
I know its a bit unlikely to use SMC in such a case, but I believe there
are some
Hi Matt,
Well, after rereading Mark’s paragraph in question, I think he did not
properly develop his complete thoughts. The first statement about the
Hydrogen Maser is absolute. The second statement is the one that is
really vague. The third statement is the clue taken with the fact that
t
I would be grateful for an answer to this question, as I also have a an HP
58503 - is the manual for the instrument available for download ?
Thank you
Roy
-Original Message-
From: Stan
Sent: Sunday, January 08, 2017 11:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] What signals if
On 8 Jan 2017 17:34, "Bob Camp" wrote:
> You are talking about a project that will take many years and likely
> more money than the price of a new home. If that is “fun money”, then
> fine. For most people that sort of commitment is a bit outside the range
> of do it for fun.
It would be interes
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