Hi All,
Time, GPS and movement plays a big part in most discussions. Each day
brings something new and fantastic in the world of science, it just
makes you think where it will take us.
http://www.physorg.com/news205500249.html
Regards
Gerald
Vk3GJM
Le 06/10/2010 08:07, Gerald Molenkamp a écrit :
Hi All,
Time, GPS and movement plays a big part in most discussions. Each day
brings something new and fantastic in the world of science, it just
makes you think where it will take us.
The naivity of scientists amazes me.
The guy says
If you
On Tue, Oct 5, 2010 at 9:04 PM, Neville Michie namic...@gmail.com wrote:
Hi,
How far could you get passing time around from amateur station to station
with a two way handshake system that establishes the instantaneous delay
on the two way path and assumes a delay of half that value? A time
In message 60aa6fcf-cf71-4e4c-a7cb-aab9f11a2...@rtty.us, Bob Camp writes:
The other answer is that DSP was not really available when the original
waveforms were developed. A modern system would not have a must be able to
work with manual delay lines and an oscilloscope requirement on it.
Well,
Hi
The issue would be just how well you know the delays. Multi path even in a
ground wave environment sets some fairly nasty limits on this.
Bob
On Oct 6, 2010, at 12:04 AM, Neville Michie wrote:
Hi,
How far could you get passing time around from amateur station to station
with a two way
Neville Michie wrote:
Hi,
How far could you get passing time around from amateur station to station
with a two way handshake system that establishes the instantaneous delay
on the two way path and assumes a delay of half that value? A time relay.
The stations would need their own short term
Henry Hallam wrote:
On Tue, Oct 5, 2010 at 9:04 PM, Neville Michie namic...@gmail.com wrote:
Hi,
How far could you get passing time around from amateur station to station
with a two way handshake system that establishes the instantaneous delay
on the two way path and assumes a delay of half
Jim-“You could look at the data from things like OTH-B
radar (Over the Horizon-Backscatter) to get a feel for this.”
Zoom in on N45° 10.300 W069° 51.600 on GoogleEarth.
I’ve driven to this area on some of the dirt roads that run
through this area. As I understand it, this project isn’t dead,
Hi Gerald:
It turns out the the long term drift spec of a gyro depends (using a
large power law, far from linear) on it's volume. See:
http://www.prc68.com/I/Sensors.shtml#Gyroscopic
I expect that one that can fit into the head of a pin will drift much
more than 1000 deg/hour.
Have Fun,
Arthur Dent wrote:
Jim-“You could look at the data from things like OTH-B
radar (Over the Horizon-Backscatter) to get a feel for this.”
Zoom in on N45° 10.300 W069° 51.600 on GoogleEarth.
I’ve driven to this area on some of the dirt roads that run
through this area. As I understand it, this
Hi Jim:
I'm in Ukiah, Calif. where one of the Lattitude observatories is
located. Finding the Lattitude was a much harder problem than finding
the Longitude and the five Lattitude observatories (all at 39 degrees 08
minutes North Latitude) were operational for almost a century. They
used a
Hi Brooke,
Looks like the physorg paper is talking about an optical rate gyro.
Don't think the drift rate matters, since position is not measured.
Yes, your reference gives bad numbers for a fiber optic rate gyro,
but the physorg paper claims a device that works.
Something is out of joint.
A main use for Rate Gyros is in stabilizing missiles in yaw, pitch and
sometimes roll.
-John
===
Hi Brooke,
Looks like the physorg paper is talking about an optical rate gyro.
Don't think the drift rate matters, since position is not measured.
Yes, your reference gives bad
Since we are talking about defunct systems
What was the time accuracy from the GOES satellites when they were transmitting
time?
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Hi Bill:
I thought the key idea was that the long term drift rate of a gyro is
independent of the mechanism.
The modern MEMS gyros have a very poor long term drift and so are only
suitable for use over short time spans.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Bill Hawkins wrote:
Hi
Also, I know that some of the TRANSIT birds are still up there, but
were repurposed. Does anyone know if they still are transmiting?
Sent from my Banana Jr. mobile device
On Oct 6, 2010, at 12:52 PM, Jason Rabel ja...@extremeoverclocking.com
wrote:
Since we are talking about defunct
The GOES xponder if on was still good. Just no sig.
Boy I think it was millisecond range as I recall. Believe it was truly a
time of Day transport.
Though I think you could get pretty good accuracy over long periods of time.
They may have used it to xmit freq info. I used it only for time. Beat
On 10/05/2010 11:52 PM, Bob Camp wrote:
Hi
Ok, the next layer to this onion is the antenna. At 100KC your antenna is 35X
smaller than it is on 80 meters foot for foot. In other words, your 100' tall
vertical on 80 equates to a3 foot tall antenna at 100 KC. QRP on 80 with a 3'
transmit
The coil allowed an ok match, but an antenna that is a tiny fraction of a
wavelength is going to be inefficient from ohmic loss in the antenna. You
could use a superconductor, but that brings another set of problems (matching
networks that also have low loss and can adapt to the changing
Gents,
Wrote: Its not just diurnal shift it plain old jumps anytime. Have been
monitoring for periods from the east coast using both a Tracor 577 and 2 X HP
vlf117 rcvrs. All kinds of stuff occur.
Reply: That’s fine equipment that you have. What I don’t know but have to find
out if the
Gents,
Wrote: All of this design and mod info is wonderful and great to fill an
engineering project workbook.
Reply: True. I have all the precision oscillators I need. Four Rubidiums and
two high stability crystal units. Four nice sized salvaged HP cases that have
working power supplies.
Gents,
Wrote: Have you ever tried to adjust a local standard to better than 1 in 10E7
using WWV or CHU?
Also wrote: I have three Rb standards to go along with my two Thunderbolts.
Wrote a reply: And which one do you believe? If any?
My experience is this: Since all four of my rubidium
Gents,
Some on this list mentioned having had less-than-optimal performance with their
HP 10811 series oscillators. James Miller G3RUH made a slight mention of
optimizing performance by readjusting the set point temperature in one of his
phase detector articles. He said though time consuming
Actually building a loran recvr is not that hard if its only purpose is
timing/frequency. I lived in Michigan at the time and used the great lakes
chain. You only had to pick the strongest single station. So essentially a
simple front end and filters a bit like wwvb but much broader band. No
Gents,
I need the RF amp schematic and power supply schematic for my Austron 2100F
Loran C receiver.
Most needed it the RF amp boards.
I really don't want to buy the CD for $35 as it's not cost effective.
Please reply off list if you could help.
Regards,
Perrier
Regardless of isolated anecdotal data on one oscillator, it
is probably not advisable to change the set point. The majority
of 10811 crystals do NOT have a turnover, only a region of
low tempco around 82 degrees.
Instead of that, change the circuit to B-mode and optimize
the heat between the two
Hi, nuts -- I got my new camera, so here's the URL, where the pix are, of the
shielded loop antenna for the Dymec DY-5842. Sorry about the pix file sizes --
not being real familiar with the new shooter, I forgot to set resolution to
something web-friendly and the little thing takes 12Mp pix. I
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