Le 11/05/2012 07:14, Peter Monta a écrit :
Are there better estimates of the ET second nowadays (relative to the
SI second)? It would be interesting to know what the cesium frequency
should have been if much better estimates of the ephemeris-time
second were available at the time. One would
I don't know what firmware version is in the units fluke.l is selling but after
reading a technical bulletin regarding the Resolution T, I wonder if the SMT
version is susceptible to the same signal tracking outage every 12.5 minutes
bug that the Resolution T firmware previous to 1.17
OK, I see that indeed there are different views: in my opinion, for
example, it is good that the unit doesn't talk by itself. I prefer to
prepare the environment then command the unit to start talk or poll the
unit on a cyclic base. I found a Trimble monitor here:
Ashihara's tests were with music/voice, taking into account
psychoacoustics, for an average group of music savvy listeners, and even
music professionals.
As uncorrelated jitter is practically raising the noise floor, most of
it was masked by the signal, making it more difficult to detect.
MailLists wrote:
Ashihara's tests were with music/voice, taking into account
psychoacoustics, for an average group of music savvy listeners, and
even music professionals.
As uncorrelated jitter is practically raising the noise floor, most of
it was masked by the signal, making it more
Moin,
I just stumbled over a nice little summary how to calculate the jitter
of a signal from its phase noise plot by silicon labs:
http://www.silabs.com/Support%20Documents/TechnicalDocs/AN256.pdf
Attila Kinali
--
The trouble with you, Shev, is you don't say anything
Why in the hell would anybody build a 50 channel receiver? At most you
MIGHT see 12 usable GPS sats... I don't think that I've seen over 10. WAAS
should be fairly useless for a timing receiver.
I can think of a couple of reasons. I'm sure there are more.
One would be marketing type
Zyfer produced a paper on WAAS for timing.
http://support.fei-zyfer.com/downloads.aspx
You will need to create a log-in and password to download their stuff.
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark Sims
The brain uses phase at low frequency and amplitude at higher frequencies to
find the direction a signal is coming from. It works better for low frequencies
than high when you have a steady tone, but high frequency positioning is better
when the signal is pulsed.
It is almost impossible to
I like Less than $20... Not for Sale Sounds like vaporcrap to me...
-
Or 216 channels (GPS L1/L2/L2C/L5; GLONASS L1/L2; Galileo E1/E5A):
http://www.javad.com/jgnss/products/triumph.html
I like Less than $20... Not for Sale Sounds like vaporcrap to me...
-
Or 216 channels (GPS L1/L2/L2C/L5; GLONASS L1/L2; Galileo E1/E5A):
http://www.javad.com/jgnss/products/triumph.html
I like Less than $20... Not for Sale Sounds like vaporcrap to me...
-
Or 216 channels (GPS L1/L2/L2C/L5; GLONASS L1/L2; Galileo E1/E5A):
http://www.javad.com/jgnss/products/triumph.html
Have used Delta receivers in production at a former employment. They are
very
Wasn't this the company that was championing Lightspeed?
:-)
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark Sims
Sent: 11 May 2012 12:20
To: time-nuts@febo.com
Subject: [time-nuts] Trimble Resolution SMT -
Breathing and heart beat are filtered out and corrected for by the brain,
otherwise we would have difficulties to hear a lot of things.
Interestingly, that works well in our natural environment, but not as well when
you are somewhere else.
When free diving (when there is no noisy scuba gear and
Yes, I moved them yesterday
Didier KO4BB
--Original Message--
From: Mark Sims
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: [time-nuts] Trimble Resolution SMT - good/bad/indifferent?
Sent: May 10, 2012 11:02 PM
Why in the hell would anybody build a 50
And why would one not want to have 0.7m horizontal accuracy while moving at
100s of knots?
You probably need a lot better than that when you fly a SAR on a jet like the
GlobalHawk.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
you should definitely check this thing out
http://www.four15news.net/biz/?read=8780772
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and follow the instructions there.
Hi,
That jitter value, was that one period jitter? Or was it jitter over a
large number of periods, thus close by the carrier?
Henk
MailLists wrote:
Ashihara's tests were with music/voice, taking into account
psychoacoustics, for an average group of music savvy listeners, and
even music
I uploaded the FEI-Zyfer WAAS papers to zippyshare if anyone is interested.
http://www32.zippyshare.com/v/66696070/file.html
Sam.
Zyfer produced a paper on WAAS for timing.
http://support.fei-zyfer.com/downloads.aspx
You will need to create a log-in and password to download their stuff.
On 11/05/2012 00:44, b...@lysator.liu.se wrote:
Hi Tim,
The answer is NO. Even though decent accuracy can be had with long
averaging. It was discussed a few years ago on this list.
--
Björn
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type
Go to your local building and planning commission, and get yourself
a copy of the topographical map for your address. They are cheap, and
are the standard by which everyone (insurance, zoning, ...) determines
your flood plane exposure.
-Chuck Harris
...
Well that's disappointing!
I need to
On 5/11/12 4:34 AM, shali...@gmail.com wrote:
Yes, I moved them yesterday
Didier KO4BB
--Original Message--
From: Mark Sims
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: [time-nuts] Trimble Resolution SMT - good/bad/indifferent?
Sent: May 10, 2012 11:02
On 5/11/12 12:48 AM, MailLists wrote:
Who would listen to pure sine tones?
As a youth, I listened to WWV, which is a pure sine tone, in between the
ticks. Drove my parents batty.
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To
On 5/11/12 2:38 AM, Hal Murray wrote:
Why in the hell would anybody build a 50 channel receiver? At most you
MIGHT see 12 usable GPS sats... I don't think that I've seen over 10. WAAS
should be fairly useless for a timing receiver.
I can think of a couple of reasons. I'm sure there are
OK I have learned a lot and absolutely fantastic news.
No matter what my aged CS says I can claim its accurate now. Its simply the
world has not caught up to or slowed down to it.
Regards
Paul
On Fri, May 11, 2012 at 2:30 AM, mike cook michael.c...@sfr.fr wrote:
Le 11/05/2012 07:14, Peter Monta
On 5/11/12 2:38 AM, Hal Murray wrote:
Why in the hell would anybody build a 50 channel receiver? At most you
MIGHT see 12 usable GPS sats... I don't think that I've seen over 10.
WAAS
should be fairly useless for a timing receiver.
I can think of a couple of reasons. I'm sure there are
On 5/11/12 5:23 AM, swingbyte wrote:
s disappointing!
I need to measure the height of my house floor to be above the flood
plane contour. I might have a look at some dted from work. Might have to
pay a real surveyor to measure the height datum.
Thanks for all the info though guys
for that,
On 5/11/12 5:54 AM, Chuck Harris wrote:
Go to your local building and planning commission, and get yourself
a copy of the topographical map for your address. They are cheap, and
are the standard by which everyone (insurance, zoning, ...) determines
your flood plane exposure.
I have been
On 5/11/12 1:51 AM, Attila Kinali wrote:
Moin,
I just stumbled over a nice little summary how to calculate the jitter
of a signal from its phase noise plot by silicon labs:
http://www.silabs.com/Support%20Documents/TechnicalDocs/AN256.pdf
Attila Kinali
and one from
Hi,
I am new to timenuts.
Is anyone able to give me the binary command sentence/code to send to my
Jupiter TU-60 to change it's output from Binary to NMEA please?
I assume it has to be a binary command starting with @@ but I am unable to
find a suitable command using Tac32 control software.
The FEMA maps didn't exist the last time I did this. I would think
it likely that the building and planning commission office for his
area would have the appropriate maps, as establishing that the proposed
house's location is outside of the the 100 year flood plane, is a
necessary check mark in
- Original Message -
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Friday, May 11, 2012 8:10 AM
Subject: Re: [time-nuts] Clocks for Audio gear
On 5/11/12 12:48 AM, MailLists wrote:
Who would listen to pure sine tones?
As a youth, I listened to WWV, which is a
And one from HP/Agilent (taking into account the colored noise too:
http://cp.literature.agilent.com/litweb/pdf/5990-3108EN.pdf
And one from Fordahl, with the random zero cross consideration:
http://www.metatech.com.tw/doc/appnote-fordahl/e-AN-02-3.pdf
On Fri, May 11, 2012 at 4:00 PM, Jim Lux
Hi
Be very careful with all these phase noise to jitter conversions. They make
some assumptions about the noise that are likely true, but may not be. The
gotcha is that a normal noise measurement does not take phase data. Without
the phase data you really can't properly do the reconstruction. You
The -12V is only used to support the RS-232 driver. The CPU should be running
and you should have discipline even without the -12V
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: J. L. Trantham jlt...@att.net
Sender:
It also makes the negative DAC voltage rail. The Tbolt DAC swings from -5V to
+5V. Lose the -12V and you can lose oscillator control.
-
The -12V is only used to support the RS-232 driver. The CPU should be running
and you should have discipline even without the
On 5/11/2012 6:46 AM, Jim Lux wrote:
On 5/11/12 5:23 AM, swingbyte wrote:
s disappointing!
I need to measure the height of my house floor to be above the flood
plane contour. I might have a look at some dted from work. Might have to
pay a real surveyor to measure the height datum.
Thanks for
Are there multiple hardware versions of the Tbolt (other than the
Tbolt-E)? My Tbolt has an Intersil 232IBE dual TTL to RS232 converter -
similar to MAX232. It generates it's own -12V. This is the version
shown on Brooke Clarke's Thunderbolt page:
http://www.prc68.com/I/ThunderBolt.shtml
Two things
1) - people in anechoic chambers will really notice the sound of their
heartbeats as well as the s-sh-s-sh sound of the blood flowing
through their heads.
http://en.wikipedia.org/wiki/Anechoic_chamber
They are designed to have complete sound absorption and are dead quiet.
Are there better estimates of the ET second nowadays (relative to the
SI second)? It would be interesting to know what the cesium frequency
should have been if much better estimates of the ephemeris-time
second were available at the time.
Hi Peter,
Everyone should take ten seconds and look
So what you are saying is every 30 years select a new leap CS reference.
Dispense with everything in between.
On Fri, May 11, 2012 at 2:21 PM, Tom Van Baak t...@leapsecond.com wrote:
Are there better estimates of the ET second nowadays (relative to the
SI second)? It would be interesting to
IMO, that would be a disaster for all areas of physics and engineering,
except for possibly some aspects of astronomy.
When they 'redefined' the Volt some years ago it was a goat rodeo.
-John
===
So what you are saying is every 30 years select a new leap CS reference.
Hi,
here is a very nice and easy to use online calculator for doing exactly
this:
_http://jittertime.com/resources/pncalc.shtml_
(http://jittertime.com/resources/pncalc.shtml)
bye,
Said
In a message dated 5/11/2012 09:17:30 Pacific Daylight Time, li...@rtty.us
writes:
Hi
Be very
Hi Merv,
I found the Navman Jupiter designers guide which has the message
formats. What you need is message 1331.
Tac32 supports this receiver, so there should be a possibility at
setup to specify NMEA protocol. Else stuff it a 1331 .
The guide is at
Hi Merv,
Hi,
I am new to timenuts.
Is anyone able to give me the binary command sentence/code to send to my
Jupiter TU-60 to change it's output from Binary to NMEA please?
I assume it has to be a binary command starting with @@ but I am unable to
find a suitable command using Tac32
Everyone should take ten seconds and look at this animated GIF:
http://leapsecond.com/pages/ut/ut-ani-v2.gif
Very nice. I guess a comparable plot with ephemeris time would be a
lot noisier and sparser, something like the graphs in the Markowitz
1988 paper.
I wonder if there's some sort of
Hi
BIH
Bob
On May 11, 2012, at 5:49 PM, Peter Monta wrote:
Everyone should take ten seconds and look at this animated GIF:
http://leapsecond.com/pages/ut/ut-ani-v2.gif
Very nice. I guess a comparable plot with ephemeris time would be a
lot noisier and sparser, something like the graphs
Hugo's idea of using a Sat dish to zoom in on a WAAS Sat as discussed in
the below paper is quite brilliant I think, and it seems one should be able
to make use of it by disabling the GPS sats (via mask angle for example) in
receivers that support WAAS, and that are used in position hold
So, I've looked at several dozen helibowls and talked to makers of said
items..
Thanks for posting this; maybe a homemade helibowl is a good way to
get a low-cost GPS antenna with full frequency coverage down to L5.
In my search for survey-grade antennas at hobbyist prices, I ran
across this,
One nasty thing about these receivers is that they seem to be useless as a
general purpose GPS receiver. Once they have a saved position (even if you
erase the old one) it does not update the lat/lon/alt values (even if you put
the receiver into 3D mode). It does not even update
Well, this prompted a short experiment to test my observations in the past.
I have a TBolt that requires +5, +12, and -12 VDC as separate inputs along
with the antenna. A year or more ago, another list member posted a question
about a failure of his TBolt, the specifics I do not remember, other
Hi All,
Thanks for the 2 prompt replies.
Tac32 does not have any facility to enter 1331 as an instruction. It has
numerous @@ commands but the TU 60 datasheets only list a small fraction of
these commands and none pertain to setting the protocol!! It is like it is
a carefully guarded
Hi Bj?m and Mike,
I have some older TU's like the 30 and these are easy to set for binary or
NMEA but the TU 60 requires a specific command 1331 and I am not savvy
enough to convert this into a meaningful @@ command if there is such a valid
command.
One would have thought the manufacturer
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