In message 4f50645b.40...@employees.org, Cliff Sojourner writes:
had a sailboat in the 80s and 90s, used a West Marine LORAN receiver and
antenna... easily got better than 100' accuracy and repeatability, year
after year.
There is a very big difference in VLF performance at sea, high in the
What do you mean by make such a chip? If it is a PIC then it is only a
PIC programming matter or programming a CPLD. To make chips you have to go
to a foundry.
On Fri, Mar 2, 2012 at 5:13 AM, Neville Michie namic...@gmail.com wrote:
I have a problem with two pendulum clocks that interfere with
Lady Heather has a sidereal time display (LMST or GMST).
With some work, you could modify the code to pulse one of the modem control
signals as a PPSS signal. The res would not be the best (probably 50 msecs
would be easily achievable)
Le 02/03/2012 05:13, Neville Michie a écrit :
A possible solution is to take mean time (from a TBolt 10MHz) and
divide it by 9,972,695.7 to give a PPS(sid) signal that can run a
digital clock dial and give one second(sid) ticks to phase the
pendulum. It may be simpler to divide by 9,972,696
The theodolite is not a problem, I use a distant street lamp (4Km
away) as a referred object (RO) to set azimuth,
and with the usual levelling it takes moments to set the co-ordinates
of a chosen star.
The RO is observed by one of several methods to get a good azimuth.
It is chosen to be
Peter wrote:
Government subsidy, like letting them use the frequency?
Like paying them as contractors to operate the transmitters.
Best regards,
Charles
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LORAN C
Seems my fet preamp is working as I discovered this morning. Maybe the fets
filament needed to warm up overnight. May have to dig in a bit. But oddly
after a few minutes neither austron has begun to lock.
I am running a hp 3586 off the same active antenna splitter and hearing the
loran
OK so only some of the GRIs are back
My first two for the eastcoast 9960 and 5930 are not.
I am evidently hearing 8970 and its other rate. (I'll have to figure that
out)
Began to wonder what it might be.
I have a list of GRIs I will need to work through to see whats alive on the
east coast.
On the subject of Loran C, I have a couple of Loran C antenna preamps kicking
around that I have not up to this point done anything with. This talk of Loran
C being back on has me thinking of the getting something set up to try and
receive these new signals.
What I have is one each of II
Additional note I am looking at 8970 F offset and its rolling down very
nicely on 2 austron 2100 series recvrs. 2.3 e-10 so far and its only been
accumulating/measuring the offset for 30-40 min.
So it looks like the chain c references are still in good shape.
My reference for comparison is a HP
Graham can only speculate that they were 8-12V. Most LORAN antennas were.
As fars as actual docs. Boy thats awful rare.
Regards
Paul
On Fri, Mar 2, 2012 at 9:50 AM, Collins, Graham coll...@navcanada.cawrote:
On the subject of Loran C, I have a couple of Loran C antenna preamps
kicking around
Paul,
That would be my guess too but these preamps are ex aircraft installations.
As to documentation, yes real documents are not easy to find but there is
always the change that someone on this list has some first hand knowledge of
these preamps.
Cheers, Graham ve3gtc
-Original
My LORAN antenna pre is fed with 8V down the coax.
On Fri, Mar 2, 2012 at 4:05 PM, Collins, Graham coll...@navcanada.cawrote:
Paul,
That would be my guess too but these preamps are ex aircraft installations.
As to documentation, yes real documents are not easy to find but there
is always
FETs filament... :)
On Fri, Mar 2, 2012 at 3:12 PM, paul swed paulsw...@gmail.com wrote:
LORAN C
Seems my fet preamp is working as I discovered this morning. Maybe the fets
filament needed to warm up overnight. May have to dig in a bit. But oddly
after a few minutes neither austron has begun
Forty years ago I made a sidereal rate generator that inserted 128 pulse for
every 46751 counted (solar frequency) pulses. The ratio of 46879/46751 is an
accurate sidereal rate, good to 1 second in about 650 years. I used some CD4029
presettable counters to count down from 46751 and used two
Azelio,
I had not considered 8V, duly noted.
Failing to find any technical details I guess I will just have to do some
careful experimentation.
Cheers, Graham ve3gtc
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Azelio Boriani
I used a PLL to convert 60Hz solar to 60Hz sidereal by multiplying by 1465
and then dividing by 1461. The error is -1.85 seconds per day (see: Reid,
Frank and Honeycutt, Kent;A Digital Clock for Sidereal Time, Gleanings for
ATMs, Sky and Telescope, July, 1976, pp.59-63).
John WA4WDL
Make that -1.85 seconds per YEAR!
John WA4WDL
--
From: jmfranke jmfra...@cox.net
Sent: Friday, March 02, 2012 11:10 AM
To: Neville Michie namic...@gmail.com; Discussion of precise time and
frequency measurement time-nuts@febo.com
Subject: Re:
Graham,
If the preamp was powered from aircraft power rather than from the receiver
coax it may be 24v.
Steve
WB0DBS
On Mar 2, 2012, at 9:05 AM, Collins, Graham coll...@navcanada.ca wrote:
Paul,
That would be my guess too but these preamps are ex aircraft installations.
As to
I am an engineer and avionics tech. They were powered up the coax from
the Apollo IIMorrow 602-604-808-612-618 by a regulated internal supply.
I believe that it was either 5V or 8V most likely 5V. All of the GPS
antennas that I am aware of are powered up the coax by 5V. It is very
important
Thanks Greg.
That sounds very reasonable is where my current thinking is.
Failing any conflicing information I may find, I will start my testint with 5V
Cheers, Graham ve3gtc
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Greg
In 1983 we were testing Loran for a vehicle
tracking application. We had a van with a
Loran aviation antenna mounted on the roof
and a relatively inexpensive marine Loran
receiver.
We started with an informal test. This was
miles inland, about an hour's drive North
of Detroit, Michigan.
We
rats !!! A couple months ago I turned down an offer of $25 for two
commercial marine units made in 2009 from a freighter being over
hauled at one of the local shipyards.
On Fri, Mar 2, 2012 at 6:30 AM, paul swed paulsw...@gmail.com wrote:
OK so only some of the GRIs are back
My first two for
At 12 EST in Boston it sounds like the 8970 chain went off the air. I do
hear another chain 10 db lower or -78 db. Will try to see if whats I hear
is the south east or central chain.
Preamp is still good as on the long wire I do not hear anything on the 3586
Regards
Paul
On Fri, Mar 2, 2012 at
Loran C absolute accuracy is between 0.1 and 0.25 miles (
http://msi.nga.mil/MSISiteContent/StaticFiles/NAV_PUBS/APN/Chapt-12.pdf)
but the repeatability is way better (from 60 to 300 feet, same ref).
When it was safe and fun to fly to Baja, Mexico I would record both ends of
the runway with my
Lots of nots so far
59300
99600
72700
79800
96100
Heard till 1200 EST
8970
When it was on the austrons were tracking down into the 1.9 E -11th.
Given further time it tends to get even better.
Do hear a chain at the -75db region.But have not discovered the GRI so far.
Was thinking it was the
I think 5v is most common now days, too. The old Odetics GPStat (even older
than the GPStar!) provided regulated 8 or 9 volts, I forget which. I had to add
a 5v regulator to allow use of a newer antenna.
Good luck with the testing, Graham!
Steve
On Mar 2, 2012, at 10:51 AM, Greg Broburg
13:50 89700 great lakes is back on the air -65 db austrons locking.
So it would seem several things.
Crazy propagation today
They dropped power and shut down
Since its all a test thats my expectation.
Regards
Paul.
On Fri, Mar 2, 2012 at 1:26 PM, paul swed paulsw...@gmail.com wrote:
Lots of
I shipped my Loran receiver to the south hemisphere a couple of months ago for
the cost of shipping, not sure if it ever made it.
I suppose no news is good news?
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: paul swed
The antennas I use mostly at work accept between 2.5V and 24V. Most
receivers I use give around 3.3V. In the basement I have receivers giving
12V to the antenna.
There are receivers giving 5V, but it is much less dominant than 10 years
ago.
--
Björn
I think 5v is most common now days,
Well at 1500 the 89700 went back off the air.
So I have to suggest keeping your Tbolts and HP 3801s. ;-)
Regards
Paul.
On Fri, Mar 2, 2012 at 1:51 PM, paul swed paulsw...@gmail.com wrote:
13:50 89700 great lakes is back on the air -65 db austrons locking.
So it would seem several things.
I wonder if what they are testing now uses smaller antennas and/or lower
power? I could easily see that being viable in light of progress in
receiver technology.
-John
===
Well at 1500 the 89700 went back off the air.
So I have to suggest keeping your Tbolts and HP 3801s. ;-)
Steve steve-krull at cox.net -I think 5v is most common now days, too. The old
Odetics GPStat (even older than the GPStar!) provided regulated 8 or 9 volts,
I forget which. I had to add a 5v regulator to allow use of a newer antenna.
+
The 1998 Odetics GPStar Plus I got had
John
Funny you saythat. In digging around on the internet thats exactly one of
the points mentioned.
Further if the systems just for pnt and some form of communications
distribution as suggested they can dump a bunch of transmitters to lower
overall cost.
I think what I am seeing is
Try this theory on and see if it fits:
These days, there is little magic about any transmitter location. Put the
transmitter in a truck along with an aerostat supported antenna. You can
just enter the Tx Lat Long into a receicer/processor.
Now, suppose the US were to distribute suck portable
On 03/02/2012 10:01 PM, J. Forster wrote:
Try this theory on and see if it fits:
These days, there is little magic about any transmitter location. Put the
transmitter in a truck along with an aerostat supported antenna. You can
just enter the Tx Lat Long into a receicer/processor.
Now,
Was it ever proven one way or the other that Iran used spoofing to bring that
drone down?
Sent from my Banana Jr.(tm) mobile device
On Mar 2, 2012, at 1:18 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 03/02/2012 10:01 PM, J. Forster wrote:
Try this theory on and see if it fits:
It makes sense that they would be using that chain. Seneca is the
primary and an eLoran station.
David
On 3/2/12 1:51 PM, paul swed wrote:
13:50 89700 great lakes is back on the air -65 db austrons locking.
So it would seem several things.
Crazy propagation today
They dropped power and shut
Hi
Given that Seneca is in my back yard RF wise, I hope they bring that chain
back up...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David McGaw
Sent: Friday, March 02, 2012 4:55 PM
To: Discussion of precise time and frequency
Looks like one can open it without problems.
- Henry
Detlef Twesten schrieb:
Hi,
does someone know the TQTC 16-01A from Tele Quarz Group?
I'd like to get the Pinout and the supply voltage to help an radio
amateur in Germany.
He tried it with 5V and the standard pinout, pin 3 supply, pin 4
Signed up two weeks ago and been lurking.
There is a wonderful page for Loran history here:
http://www.loran-history.info/default.asp
Dave (Pacific Northwest)
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Mike Naruta AA8K
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