I seem to remember a recent 'jamming' trial off the east coast of England
that didn't kill the GPS but did shift the position of the ships involved -
certainly enough to get them aground or to hit something if they weren't
paying attention. I think one showed up inland - which should have been
Not so sure - it's a light blue colour (presumably undeneath too) so would
not be too visible against blue sky looking up. WW2 PRU Spitfires used the
same paint scheme ('duck egg' blue?), I believe, to get around German visual
obervation.
Could be wrong, shoot me down. :-)
Paul Reeves
I believe one of our research establishments was experimenting with a
multistatic radar system based on cellphone tower transmissions and did a
very good job of tracking one of the first (if not the first...) 'stealth'
aircraft that the US sent over this way. Certain persons were rather annoyed
And what does LightSquared have to do with time-nuttery?
-John
Obvious - it may break your reception of the GPS time reference.
David
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
I'm sure they have access to whatever they need. Set up a bunch of
pseudolites, and of you go
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Palfreyman
Sent: 15 December 2011 22:07
To: j...@quikus.com; Discussion
If it jams your GPS - quite a lot!!
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: 16 December 2011 06:24
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] The GPS navigation is the
Does the FE-5680A have a similar Rb cell to the LPRO-101?
If so do they have finite lamp life, (can you find the one you buy
has little life left?)
Or by not reporting the status of the lamp no-one worries about it?
cheers,
Neville Michie
___
Has a 9462 oscillator module in it.
I've been fooling with little C hacks to make freq and phase
measurements via GPIB.
In my desire to super-tweek the timebase I discovered that small
adjustments take
many minutes to settle down. It's like herding cats.
I noticed that physical shocks
Forgot to mention, each point is slightly more than 1 second.
On 12/16/2011 03:19 AM, Chuck Forsberg WA7KGX N2469R wrote:
Has a 9462 oscillator module in it.
I've been fooling with little C hacks to make freq and phase
measurements via GPIB.
In my desire to super-tweek the timebase I
I suspect it crashed and got mamgled badly, and they took 3 days to make the
best model they could out of balsa wood. The bottom was so mangled that they
could not replicate it well enough for the picture, so they did not do that.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do
I think every Rb has a finite lamp life...
On Fri, Dec 16, 2011 at 11:41 AM, Neville Michie namic...@gmail.com wrote:
Does the FE-5680A have a similar Rb cell to the LPRO-101?
If so do they have finite lamp life, (can you find the one you buy has
little life left?)
Or by not reporting the
Alpha Jet Tiger? Looks more like a 'Cheetah'. Fast but no stamina.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of gary
Sent: Thursday, December 15, 2011 10:41 PM
To: shali...@gmail.com; Discussion of precise time and frequency
It has been pretty well shown that the lamp life is
effectively infinite. The only thing that happens to
shorten an effective useful campaign of the lamp is
when the Rb plates out on the lamp envelope, and
renders the glass opaque. That problem, however, is
easily remedied, by heating the glass
Yes, of course, in that sense: the life must be restored at some time.
On Fri, Dec 16, 2011 at 2:29 PM, Chuck Harris cfhar...@erols.com wrote:
It has been pretty well shown that the lamp life is
effectively infinite. The only thing that happens to
shorten an effective useful campaign of the
Chuck Magnus and others will tell you the same reheat the lamp to evaporate
the Rb. I have done it also and it puts it right back in the mid range of
life. Voltage wise. No way to know if it might plate out quicker with age.
The Rb reference were built with a finite life expectation 7 years I
On 12/15/11 10:25 PM, Chris Albertson wrote:
For testing, I'd assume the gps simulator only needs to be good enough
that the receiver will detect the signal. There is some Doppler
shift so the receiver must have to look over a wider range of
frequencies so if the simulator was inside that
A used Spirent is only 26K to 37K. Interesting: playing back bits from
RAM... can it be that simple? Obvious: a DAC is required.
On Fri, Dec 16, 2011 at 3:47 PM, Jim Lux jim...@earthlink.net wrote:
On 12/15/11 10:25 PM, Chris Albertson wrote:
For testing, I'd assume the gps simulator only
The idea that conversion to metric would require replacing all of the machine
tools (lathes, mills, etc) is a myth. Any U.S. machine shop has walls and
toolboxes covered in conversion charts, converting drill, screw, wire, sheet
sizes from one crazy measurement to another. One single additonal
As the engineer quoted in the article says, Iran is not Afghanistan or
Pakistan. Unfortunately Americans aren't very good in geography or history and
we tend to lump everybody in that part of the world together, and so forget
that Iran was once called Persia and the Persian Empire at one
On 12/16/11 7:46 AM, Azelio Boriani wrote:
A used Spirent is only 26K to 37K. Interesting: playing back bits from
RAM... can it be that simple? Obvious: a DAC is required.
No.. you don't even need a DAC. The underlying waveform is a binary
code that is BPSK modulated.
there are a variety
Hi Don:
Sure converting lengths is easy and I have metric, English and weird taps and
dies, but how do you turn metric threads?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html
Don Couch wrote:
The idea that conversion to metric would
Chuck, I have a Racal 1992 with exactly the same government label on its
side as in your picture, except that my ink-stamped warranty date is a
few days later than the date on your counter/timer. These must have come
from a large government contract order.
However, while counting the 10 MHz
Which ones?
Some time ago I was setting up to turn a Metric and discovered that there where
a Japanese Metric standard for the thread as well as a German Metric standard
both of which where slightly different from the standard Metric threadd that
was I wanted to cut.
Cheers, Graham ve3gtc
With a metric tap die set?
:-)
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Brooke Clarke
Sent: 16 December 2011 16:48
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] metric / English
Hi Don:
Sure
Sounds like an interest project, Do you have any performance plots?
It would be interesting to see how it compares with the TPLL2 which uses a
$5.00 USB sound card to greatly improve the performance of the old all
analog $10 TPLL.
Using mostly junk box parts, and a 3e-13 selected HP10811
Not that hard, actually. My 1984-vintage lathe has an inch lead screw, but
the quick-change box that drives the leadscrew will do all of the inch and
most metric threads directly. The few weird metric pitches are
accommodated by changing two gears on the input side of the QC box. I
suppose that at
Indeed, Francis! My first university level professor of mathematics was an
Iranian and we have been teaching their students for more than a half
century! They ain't dumb!
73
Lee K9WRU
- Original Message -
From: Francis Grosz fgr...@otiengineering.com
To: time-nuts@febo.com
Here in Kansas near a bombing range. Last year I was pheasant hunting nearby
with a farmer big into precision ag, RTK on all equipment. Walking across a
grain sorghum field I commented about a very crooked set of rows compared to
the rest. Oh, a B2 went over and it takes a while sometimes
On Fri, Dec 16, 2011 at 8:48 AM, Brooke Clarke bro...@pacific.net wrote:
Hi Don:
Sure converting lengths is easy and I have metric, English and weird taps
and dies, but how do you turn metric threads?
How would you cut 40 tpi or 24 tpi? You put in the correct gears to
drive the lead screw so
Slightly peripheral: Just got a bit of TI advertising with a couple of
chips of TN interest:
http://www.ti.com/product/lmk03806
http://www.ti.com/product/lmk00301
These llok very interesting. 3.3 v i think in cmos mode is enough for
most of the instrument external ref inputs.
Don
Jim Lux
On
Hello,
Thanks to Brooke's excellent web page [1] on getting the DG535
80 MHz clock working, I was able to fix the Ext Clk Err on
a DG535. Everything on the front panel seems to work.
However, triggering does not work. I can't get a trigger to
occur in any triggering mode. Setting the triggering
I bought a 1992 a few years ago and I've been quite happy with it. It
does have a few quirks, of course. Some good, some bad.
1. You can get a 10 sec. gate time and therefore .001 Hz resolution at
10 MHz by holding the 'up arrow' key for about 2 sec. It's in the
manual, once. If you
Stealthy doesn't mean invisible. Think low tech.. a bunch of guys out in the
desert with cellphones .. I just heard it come over
Here in Kansas we still have some 50s watch towers from the 'Gawk Tower' days.
Lots of people spent some cold nights here on the phone to some central
location
Hi N0UU:
Moffett Filed in Mountain View has the normal approach side of both runways along a six foot chain link fence that's
directly adjacent to the 101 freeway. I think the rule is they are supposed to clear the freeway by 100 feet, but the
only practical limit is that the bottom of the
Hi Kevin:
Just a guess. If line triggering does that there may be a problem with the
power transformer.
Use an Ohm meter to locate the transformer terminals for the AC line and then check from one of those to all the other
terminals.
I suspect there's a short in the transformer.
Look at U502
See attached .pdf on Iranian engineers.
-John
Javad Ashjaee.pdf
Description: Adobe PDF document
___
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the
You use the change gears in a ratio of 127:50 (254:100)
-John
==
Hi Don:
Sure converting lengths is easy and I have metric, English and weird taps
and dies, but how do you turn metric threads?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.ti.com/product/lmk03806
If anybody is collecting a list of common frequencies, there is a table in
the data sheet for that chip.
--
These are my opinions, not necessarily my employer's. I hate spam.
___
time-nuts mailing list --
There is no error with the change gears. The ratio of inches to
centimeters is exactly 1:2.54 or 100:254 or 50:127. It is often done with
a train of 3 gear pairs to get the center-to-center shaft spacing right.
-John
=
Not that hard, actually. My 1984-vintage lathe has an inch
On Fri, Dec 16, 2011 at 9:45 AM, George Dubovsky n4ua...@gmail.com wrote:
. I
I... suppose that at some very small level, there is some error in the
metric
threads produced (and I've never bothered to calculate it for my lathe) but
it's a VERY small error that has never been an issue for
In the city, you just don't hear even a jetliner flying at altitudes of
20,000 feet or more.
I'd think it'd be pretty hard to hear a drone up 40,000++ feet, even in
the wilderness.
-John
Stealthy doesn't mean invisible. Think low tech.. a bunch of guys out in
the desert with
1. You can get a 10 sec. gate time and therefore .001 Hz resolution at 10 MHz
by holding the 'up arrow' key for about 2 sec. It's in the manual, once. If
you blink you miss it.
What page please - I never spotted that ...
Regards,
David Partridge
-Original Message-
From:
On Dec 16, 2011, at 11:25 AM, Brooke Clarke wrote:
Just a guess. If line triggering does that there may be a problem with the
power transformer.
Use an Ohm meter to locate the transformer terminals for the AC line and then
check from one of those to all the other terminals.
I suspect
Javad also has a different opinion on LS2 than most of the GPS industry.
http://www.javad.com/jgnss/javad/news/pr20111214.html
--
Björn
See attached .pdf on Iranian engineers.
-John
___
time-nuts mailing list -- time-nuts@febo.com
To
Of course he does since he wants to sell his newly developed filters. But
then he doesn't say how those will be applied to the same consumer grade
units that provide a means for the user to install said filter.
The guy is obviously just promoting his own business, and may even have some
In message 015001ccbc34$7ce893c0$76b9bb40$@rr.com, Tom Holmes writes:
Of course he does since he wants to sell his newly developed filters.
My guess: His newly developed *and patented* filters. Javad is a
very, very capitalistic guy.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
On Dec 16, 2011, at 11:25 AM, Brooke Clarke wrote:
Just a guess. If line triggering does that there may be a problem with the
power transformer.
Use an Ohm meter to locate the transformer terminals for the AC line and then
check from one of those to all the other terminals.
I suspect
I have small British lathe (Myford) with a 1/8 inch leadscrew, and a
127 tooth gear is inconveniently large.
By examining the ratio of every gear for every thread required (with
a simple basic program) I found
a solution within 50 parts per million for all metric threads.
The wierdest threads
Javad (the guy) has been in the GPS business a long time: He started
Ashtech back in 1987 after leaving Trimble to make precision GPS stuff.
In 96, he left Ashtech, which became part of Magellan, which became part
of Thales, which then became not part of Thales, and somewhere along the
line
On 12/16/11 1:09 PM, Poul-Henning Kamp wrote:
In message015001ccbc34$7ce893c0$76b9bb40$@rr.com, Tom Holmes writes:
Of course he does since he wants to sell his newly developed filters.
My guess: His newly developed *and patented* filters. Javad is a
very, very capitalistic guy.
For
Visualize the size of the landfill for all the scrapped GPSs. I have my doubts
any retrofit scheme is going to fly.
If the bandwidth is sufficient, it would be far cheaper to scrap one of the
satellite radio bands, probably Sirius since XM has more satellites in orbit
and they are more
MIC CHECK!
It is time to occupy this thread with something that is time-nutty.
The previous thread on gravity control of a pendulum clock was hijacked
by Jim Palfreyman to a conflict on the metric system, that led to
something completely off topic continuing under the SAME SUBJECT.
Now
I agree. Bravo Bravo
Don Lewis
Austin, TX
-
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Friday, December 16, 2011 4:02 PM
To: Discussion of precise
Hi David
It's part of the resolution settings, whereby you alter the number of
displayed digits using the up down arrows, holding the up arrow for over two
seconds will shift the display left and increase the gate time so you
effectively get a 10 digit display with the left most digit
Larry wrote:
However, while counting the 10 MHz from my HP Z3801A and displaying
0.01 Hz resolution on my 1992, I can rap very smartly indeed with my
knuckles on the outside of the counter case (anywhere) and not
change the displayed count. Further, my counter seem insensitive to
orientation
Hi All,
One of our clever locals has produced this CPU controlled LCD for
monitoring the behavior of your thunderbolts.
http://www.vklogger.com/forum/viewforum.php?f=71
Very nice unit, way better than the Chinese unit floating around eBay.
I have no relation to the builder other than being
Hi, Brooke,
To cut metric threads on an inch machine, I mesh the 127 tooth gear with the
100 tooth gear that came with my Sherline lathe threading attachment. Works
great.
Don Couch
--- On Fri, 12/16/11, Brooke Clarke bro...@pacific.net wrote:
From: Brooke Clarke bro...@pacific.net
At this time of the year many people look for frivolous puzzles to
solve.
My puzzle is to design a clock.
This clock consists of 6 cubes, each has a digit display on one face.
It does not matter how you arrange them, if they are in a line they
will display the
right time. (there may also be a
How is this, right off the top of my head, so there might be flaws...
0) blocks must have a gravity sensor so they know which side is up.
Next they have to which faces touch other blocks and which two faces
need to have digits displayed
1) Each box is identical.
2) they need to communicate so
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