Hi
10 MHz at roughly 10 dbm is a pretty good bet. That’s *if* it uses an external
reference and not just something like IRIG. It’s not really clear that they all
do have external reference capability (despite the jack).
Bob
On Sep 5, 2014, at 1:00 AM, Bob Bownes bow...@gmail.com wrote:
Has
Hi Bob,
Being relatively new to this 'high end' time stuff, there's lots to
learn... So, how much bandwidth might a typical OCXO have on the EFC
pin? My assumption is that it is very low, but I have nothing to back
that up.
If I had 10Mhz or some other high frequency on the EFC line, would a
Some OCXO schematics:
http://leapsecond.com/museum/10544/
http://leapsecond.com/museum/10811a/
/tvb (i5s)
On Sep 5, 2014, at 5:50 AM, Dan Kemppainen d...@irtelemetrics.com wrote:
Hi Bob,
Being relatively new to this 'high end' time stuff, there's lots to
learn... So, how much bandwidth
Oh, while we are at it, how about the 10543?
Cheers,
Magnus
On 09/05/2014 03:49 PM, Tom Van Baak (lab) wrote:
Some OCXO schematics:
http://leapsecond.com/museum/10544/
http://leapsecond.com/museum/10811a/
/tvb (i5s)
On Sep 5, 2014, at 5:50 AM, Dan Kemppainen d...@irtelemetrics.com wrote:
Hi Tom,
Just catching up and time for an update on progress. Had had to put the
faulty 3210 to one side this week to get some work done, but a couple of
developments meantime: First: Put an enquiry on the Oscilloquartz web
enquiry form a week or so ago and they sent me the full 3210 pdf
Tom,
Awesome! Thanks!
Section 2-14. Since noise on the EFC line affects the oscillator's
stability (noise appears as FM on the output) care must be taken to
ensure that a relatively noise free EFC...
I was thinking the Varactor had be tied to the crystal, which only makes
sense. So, the bottom
Ian
Have not downloaded the info yet.
But I was surprised by the fact you were using LORAN sooo you must be in
Europe. Lucky you to have such a fine signal.
Great job on the tic. Now to go download the bits.
Thanks again.
Regards
Paul.
On Sun, Aug 31, 2014 at 10:26 PM, Tom Van Baak
Ian what files are needed?
Forgive me if its in the read me.
Thanks
On Fri, Sep 5, 2014 at 2:56 PM, paul swed paulsw...@gmail.com wrote:
Ian
Have not downloaded the info yet.
But I was surprised by the fact you were using LORAN sooo you must be in
Europe. Lucky you to have such a fine
Hey Paul,
Grab the tarball, it contains each of the other files in that directory.
And yes, the README tells you what you need to do. Note you will need
the PRUSS compiler end probably the AM335x PRU Package to compile.
Google for it, or grab this one via git:
no that is not so bad, there --inside of the box is always a small RC
which takes care the RF can't get into the oscillator, just look the
oscillator circuirs
73
Alex
On 9/5/2014 10:18 AM, Dan Kemppainen wrote:
Tom,
Awesome! Thanks!
Section 2-14. Since noise on the EFC line affects the
After some productive work, and some frustrating weeks spent fighting
weird flakiness and needlessly replacing components, only to find that
the problems went away after I reseated my main power connector, IT
WORKS!
Here's where I am now:
* Main board: Arduino Due (ATSAM3X ARM Cortex-M3 CPU @
Ian
Thank you
On Fri, Sep 5, 2014 at 3:54 PM, Iain Young i...@g7iii.net wrote:
Hey Paul,
Grab the tarball, it contains each of the other files in that directory.
And yes, the README tells you what you need to do. Note you will need
the PRUSS compiler end probably the AM335x PRU Package to
d...@irtelemetrics.com said:
If I had 10Mhz or some other high frequency on the EFC line, would a typical
OCXO respond to that?
Some VCXOs actually specify their bandwidth. High audio is sometimes useful.
I haven't seen anything beyond that, but I'm just listening to discussions
like this
Andrew,
My only comment, since I’m working on something very similar myself (just a GPS
frequency standard that will be able to have the OCXO shut off, and just output
1PPS for an NTP system), would be to not output any signal/pps/ntp timing
unless you have a solid GPS lock, since before that,
The schematic provided shows two 20K resistors in series with the
varactor. So, yes there is some RC time constant. But is it enough to
filter our 100Hz or 1Khz, or 100Khz? I'll have to pull out the
calculator. The other issue, is I don't know how my OCXO is built. No
schematic.
Also, don't
This is interesting. Im in the process of building my first GPSDO, it
would be interesting to use the PRU to monitor and validate that device,
obviously to the limit of the PRU's accuracy.
I have several BBB's sitting here waiting for a project.
On Sat, Sep 6, 2014 at 7:14 AM, paul swed
it is not so easy to FM modulate a crystal oscillator, since the crystal
has a high Q therefore the modulation bandwidth of a crystal oscillator
is very narrow example: Q = F/dF - df = F/Q if F = 10MHz, Q = 60,000
dF = 166Hz
73
KJ6UHN
Alex
On 9/5/2014 1:10 PM, Hal Murray wrote:
I have made some measurements on the noise voltage density in batteries.
The short result is:
1. NiCd rulez.
2. Size DOES matter.
A longer result is under
http://www.hoffmann-hochfrequenz.de/downloads/NoiseMeasurementsOnChemicalBatteries.pdf
You must use the direct link, it
On Fri, Sep 5, 2014 at 2:28 PM, Ryan Stasel rsta...@uoregon.edu wrote:
Cool idea though. I’ve found very few (none) instances of people actually
running NTP servers from arduino hardware… most use Raspi or the like.
Note the Arduino Due has an ARM based CPU inside. It's not jet the
old AVR
Hi
Oddly enough (and yes it is odd) you can modulate an oscillator well outside
the crystal’s bandwidth. The bigger issue is that the EFC does not pull the
crystal very far on a normal OCXO. The FM modulation index drops to very small
numbers pretty fast as you go up in modulation frequency.
Panasonic EYP-1BF115 Thermal Cutoff 115C 1A, part number P10912 from
Digikey is a perfect fit to replace the original -hp- part.
Dan
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On Sep 5, 2014, at 17:34 , Chris Albertson albertson.ch...@gmail.com wrote:
On Fri, Sep 5, 2014 at 2:28 PM, Ryan Stasel rsta...@uoregon.edu wrote:
Cool idea though. I’ve found very few (none) instances of people actually
running NTP servers from arduino hardware… most use Raspi or the
Gerhard wrote:
I have made some measurements on the noise voltage density in
batteries. The short result is: 1. NiCd rulez. 2. Size DOES matter.
Nice work! (But not exactly news.) As noted in the NIST paper you
quote, the noise of batteries is very closely correlated with their
internal
Hi Bob
You have some good observations. Spread spectrum clocking is one I
hadn't considered when looking at this problem. In that case the
crystal is pulled a bunch. (It's also cheating in my opinion!)
Correcting for mechanical vibration in aircraft would also tend to
indicate it's
Well, my *previous* clock was on the Mega 2560 (an AVR chip, although
admittedly one with more code space and IO than usual). I made some
mention of it back in 2012. It had 500ns timer granularity and no Rb
(just DPLL of a timer running off of the onboard crystal) but it still
managed well enough
I was wondering if a board like the udoo would help your ntp performance. I
have one and would be willing to try this configuration. Have you posted your
source? I think I got confused as to who was doing this. I don't have a
rubidium but I have a 6T on a breakout and a couple of very good
This topic comes up every few years.
I found an interesting thread back in late 2006.
Typical EFC frequency response (bandwidth) of a OCXO
https://www.febo.com/pipermail/time-nuts/2006-December/022758.html
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