Hi
I most certainly *have* seen an NTP server that ran off of WWVB and relayed
the result to the internet. The fun part was that they had entered the “delay”
number into their config file with the wrong sign on it (or there was a bug in
the NTP code at that time). The result was that they were
My 15.36 MHz crystals arrived and using one to replace the 8 MHz crystal
seems to, again, improve the ability of the BALDR clock to lock onto and
decode the signal. It now reliably syncs if the clock is within 6-7 inches
of the tuned, ferrite rod antenna (still just wrapping the wire around the
Am 01.09.2018 um 20:40 schrieb Magnus Danielson:
One should first know that there is a lot of papers now on frequency
transfer over fiber. The stability achieved on the best ones so far
greatly below that of the optical clocks that they want to compare.
Please, in a nutshell: what are the
Try receiving wwv or wwvb with your HP3586 SLV and determine precisely
where f(o) is.
It's difficult, ...as propagation and atmospheric conditions will
unwittingly prevail.
This ham prefers my gpsdo's, or my cesium.
Don
N5CID
=
On
Me too... that's why Lady Heather can calculate and plot solid earth tide
displacements. Also the vertical offset in gravity due to solar/lunar tidal
effects.
-
>I'd rather read about Earth tides affecting time measurements. ___
With respect, Scott, EVERY ham knows about WWV.
On Saturday, September 1, 2018, Scott McGrath wrote:
> I’m concerned with the science
>
> the WWV/WWVB stations provide invaluable information about the condition
> of the ionosphere with a baseline of DECADES of data.
>
> Also dont forget that
Hi Bob,
Thanks for the paper.
One should first know that there is a lot of papers now on frequency
transfer over fiber. The stability achieved on the best ones so far
greatly below that of the optical clocks that they want to compare.
Then, for those links able to transfer phase/time, most of
On Sat, Sep 1, 2018 at 9:13 AM, David G. McGaw
wrote:
> I consider saving WWV/WWVH/WWVB to be ON topic. They may not be as
> precise as some on this list like to achieve, but they are publicly
> available methods of time dissemination. I am very concerned that factions
> of NIST consider that
Mark,
That would be most useful and free folks from a few of the proprietary
satellite tracker programs. One could write a 'shim' to consume the output
from a tcp/udp (or serial) port and convert to the proper format for a
chosen polar or az/el rotor.
Bob
On Sat, Sep 1, 2018 at 2:00 PM Mark
I recently added a feature to Lady Heather that can output the sun and moon
positions to a port. This was for use by solar trackers and moon bounce
antennas. It would be easy to modify that code to output the position of a
satellite (or all satellites) if you wanted to keep an antenna
On Sat, Sep 1, 2018 at 3:49 AM, Dana Whitlow wrote:
>
> Question for Mark re metal foil under the antenna:
>
> What's the nature of the improvement? Between the large tilt angle and
the
> shape of the
> foil piece, I'd certainly not expect any material improvement in the
> multi-path department.
Jim,
You can still find the Deep Space Network fiber-optic
distribution equipment for sale on the Microsemi website:
https://www.microsemi.com/product-directory/modular-synchronization-systems/4168-time-code-translator
I designed the hardware for NASA's DSN upgrade while at Timing
I consider saving WWV/WWVH/WWVB to be ON topic. They may not be as
precise as some on this list like to achieve, but they are publicly
available methods of time dissemination. I am very concerned that
factions of NIST consider that this should no longer be part of their
mission.
David
There was a paper published when NASA did something similar for LC39 and the
VAB.Anyone have a copy because the link i have is dead.
As I recall it was some trick and compensating for thermal effects on the fiber
itself was a large part of the effort.
On Sep 1, 2018, at 5:29 AM, Magnus
Guys,
The noise level has risen rather high lately. I really think that
discussions of jamming of GPS and other systems are not relevant.
The loss of WWVx is also mostly OT as I don't believe that anyone seriously
still uses it for a time/frequency reference these days.
Dave
Hi
> On Sep 1, 2018, at 3:06 AM, Magnus Danielson
> wrote:
>
>
>
> On 08/31/2018 03:36 PM, Bob kb8tq wrote:
>> Hi
>>
>> “Backbone timing” gets done by boxes buried deep in systems. Those systems
>> take years
>> to design. The boxes that go in them similarly take years to get onto the
>>
Congratulations Magnus, a well deserved reward for your contributions. My
boss is a Senior Member and I know they do not just give those away.
Well done!
Didier
On Thu, Aug 30, 2018, 3:40 PM Magnus Danielson
wrote:
> Hi Bob,
>
> On 08/30/2018 10:33 PM, Bob kb8tq wrote:
> > Hi
> >
> > Magnus …
Am 31.08.2018 um 20:17 schrieb Hal Murray:
att...@kinali.ch said:
I have somewhere a paper (which i cannot find currently, sorry) that used a
dish trained at one of the EGNOS satellites and used it as the only source
for timing. IIRC the results were promising, but not spectacular. The
Hi,
It was very telling when I crashed a research group into the reality of
phase/time transfer over fiber compared to frequency transfer. Armed
with a whiteboard and pens, I derived the forumulas and showed how they
worked and not worked. It's a completely different ball-game and their
"known
From: shouldbe q931
[]
On Fri, Aug 31, 2018 at 10:31 AM Dr. Götz Romahn wrote:
For German regulations see here:
https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time.html
Götz
CET is derived from UTC
Hi Hal,
On 08/31/2018 08:17 PM, Hal Murray wrote:
>
> att...@kinali.ch said:
>> I have somewhere a paper (which i cannot find currently, sorry) that used a
>> dish trained at one of the EGNOS satellites and used it as the only source
>> for timing. IIRC the results were promising, but not
On 08/31/2018 03:36 PM, Bob kb8tq wrote:
> Hi
>
> “Backbone timing” gets done by boxes buried deep in systems. Those systems
> take years
> to design. The boxes that go in them similarly take years to get onto the
> market. Once designed
> deployment is far from instantaneous. Operators are
Hi,
On 08/31/2018 12:18 AM, Poul-Henning Kamp wrote:
>
> In message <96e995c4-5ca2-af02-9738-0a6d87a9f...@pacific.net>, Brooke Clarke
> writes:
>
>> But it's extremely hard to make a jammer for WWVB (60 kHz) [...]
>
> You can do it city-scale with a 18-wheeler sized loop-antenna
> and
On 08/30/2018 11:20 PM, Brooke Clarke wrote:
> Hi Bob:
>
> I would disagree in that ease of jamming/spoofing is strongly related to
> wavelength. That's because antenna efficiency goes down as the size of
> the antenna gets smaller than 1/4 wave.
> So, it's easy to make a GPS jammer (1,100 to
24 matches
Mail list logo
