From: Chris Albertson
When they broadcast live TV like from a sports vent I wonder if the time
code generated by the camera is preserved? But then even if it were the
time might have been set manually to match the display on the camera
operator's cell phone.
Same for scenes with clacks in the
Bill,
On 02/01/14 20:33, Bill Hawkins wrote:
IIRC, the reason why NTSC has an almost 30 fps rate is that early
vacuum tube TV sets could develop heater-cathode leakage that
would put a black hum bar in the picture. Almost 30 allows the
bar to move through the picture in a 60 Hz power
Hi folks,
This has probably been covered before, but I thought it worth knowing
I wanted to use my new laptop with my Trimble/Nortel GSP receiver.
As my laptop doesn't have an RS-232 port, I purchased a cheap USB to
RS-232 adaptor.
After a few false starts I found that the older Tboltmon
Sorry, that doesn't make much sense, does it...
I just realised that TrimbleStudio is not just USB.
It runs quiet happily with RS-232
. Zim
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On 03/01/14 10:04, David J Taylor wrote:
From: Chris Albertson
When they broadcast live TV like from a sports vent I wonder if the time
code generated by the camera is preserved? But then even if it were the
time might have been set manually to match the display on the camera
operator's cell
From: Graeme Zimmer
Hi folks,
This has probably been covered before, but I thought it worth knowing
I wanted to use my new laptop with my Trimble/Nortel GSP receiver.
As my laptop doesn't have an RS-232 port, I purchased a cheap USB to
RS-232 adaptor.
After a few false starts I found that
From: Magnus Danielson
Since you don't know the distribution and de-coding and trans-coding
delays, it's hopeless to come up with a skewed time to fit all. Forget
it. The mode is rather to live with the delay there is.
Cheers,
Magnus
===
There seems to be a
On 03/01/14 15:05, David J Taylor wrote:
There seems to be a mis-perception that folk might estimate a fixed
delay and somehow use the data as a source of time. That was certainly
never my thinking, but simply to observe the delays, and see what values
might be obtained. I've contributed one,
From: Magnus Danielson
There are several potential time-signals, but I would say it would be a
bit hard to verify their traceability, which makes the exercise difficult.
The MPEG-2 Transport Stream have PID timestamps for every channel.
However, there is really no good TAI/UTC traceability in
Does the Trimble Thunderbolt provide 1pps on DCD of the RS232 interface?
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Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
br...@lloyd.com
+1.916.877.5067
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Corby
Having a good time tinkering with the 5061. Did change the resistors for
the cfield regulator so that its much close to the schematic and am
experimenting with that.
The system does seems to be able to be tuned through a stable position that
reduces the drift to 2 min/10ns drift and the CS
Re: Measuring TV Delays
With regard to:
On 02/01/14 20:33, Bill Hawkins wrote:
IIRC, the reason why NTSC has an almost 30 fps rate is that early
vacuum tube TV sets could develop heater-cathode leakage that
would put a black hum bar in the picture. Almost 30 allows the
bar to move through the
Message: 1
Date: Fri, 03 Jan 2014 17:10:33 +1100
From: Graeme Zimmer gzim...@wideband.net.au
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Trimble: Using RS-232 via with USB adapter
Message-ID: 52c65459.1000...@wideband.net.au
Paul,
First off, is it a 5060A or 5061A?
More C-field current increases frequency.
You can check the synthesizer frequency, It should be 12.6317716 or
12.6317725 Mhz.
Either one is OK as you select the A15 resistor to center the C-field pot
anyway.
Here is info from an earlier post.
The
Hello,
Brand new to this list. I'm blind, but have always been fascinated with
time, time standards, timezones, etc. As a kid, WWV used to be my
favorite radio station, no kidding! My dad would let me listen to it for
hours on his ham radio, and eventually I got a shortwave radio of my
own.
Two ideas (1) buy a WWV receiver or (2) I'm sure Windows must come with
something like Apple's Garage Band (I don't know about Windows) but use
that to compose a sound that plays in an endless loop. Likely you'd use
one of the drum machines. Basically I'm saying yu can treat it as music
and
No. The serial port is just three wires, the PPS signal is TTL level on
one of the BNC connectors.You will have to level sift it to re-232
voltage levels and then make a costom cable
On Fri, Jan 3, 2014 at 7:50 AM, Brian Lloyd br...@lloyd.com wrote:
Does the Trimble Thunderbolt provide
On Fri, Jan 3, 2014 at 11:35 AM, Chris Albertson
albertson.ch...@gmail.comwrote:
No. The serial port is just three wires, the PPS signal is TTL level on
one of the BNC connectors.You will have to level sift it to re-232
voltage levels and then make a costom cable
Thank you. No problem.
Jayson,
I chuckle because WWV is my favorite radio station also.
Why not tune it in on a good day and record the audio? Then you can digitize
it on the computer and have a .WAV file which you can play any time.
Trouble is, if you have recorded the announcements, you won't have the correct
Hi Paul,
About cesium clocks: hp 5060A and early versions of the hp 5061A needed to be
able to keep *either* atomic time (true, accurate, stable, SI seconds) or
astronomical time (inaccurate, unstable, slow, and gradually slowing, earth
rotation time).
The larger C-field range allowed this
David,
On 03/01/14 16:28, David J Taylor wrote:
From: Magnus Danielson
There are several potential time-signals, but I would say it would be a
bit hard to verify their traceability, which makes the exercise difficult.
The MPEG-2 Transport Stream have PID timestamps for every channel.
However,
On Fri, Jan 3, 2014 at 12:09 PM, Bob Albert bob91...@yahoo.com wrote:
Jayson,
I chuckle because WWV is my favorite radio station also.
Why not tune it in on a good day and record the audio? Then you can
digitize it on the computer and have a .WAV file which you can play any
time.
A Google search found this web page that has 2 simulator programs:
http://www.atkielski.com/main/FreeSoftware.html
Enjoy!
Julian
KR5J
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I'd like to see a WWVB generator that could output the 60 KHz WWVB signal
through a sound card for the benefit of hard of hearing atomic clocks
by Oregon Scientific and others.
On 01/03/2014 10:32 AM, JULIAN TOPOLSKI wrote:
A Google search found this web page that has 2 simulator programs:
I have played WWV or CHU when I want to know the time but not be
bothered by extraneous sounds.
I live in Michigan, USA. When I built my first homebrew RF spectrum
analyzer
I found that I had to spend a week stopping CHU and another local AM station
from coming in on the power line.
A cheap
At the station that I worked at, time code was recorded in the
digital video stream in the camera, but, was only used for editing.
The editors would use this time code to mark the segment end points.
There was no correlation to the camera time code and actual time.
When we taped a show from a
Corby it is a 5061a with a 5060 tube in it that has a few Cs leftover.
(Original 004 tube was seriously empty)
Had to create a new oven controller to get to those Cs its temperature is
slightly elevated over what the 5061a could do. I can just see beam current
at maybe .25 of a tick mark above
Does the Trimble Thunderbolt provide 1pps on DCD of the RS232 interface?
No, but you can open it up and add a wire. That will give you CMOS rather
than RS232, but it works. (Or at least, it works for me and I've never heard
a good story where it didn't work.)
One problem is that the PPS
Sometime in the late 1990s, a friend of mine who works for a local city
government asked me if there was something that I could do about some
WWVB clocks located in a conference room, downtown, on a middle floor of
an office building amongst computers and fluorescent lights that never
managed
The TTL level PPS did not work for me when I tried to drive a long cable.
I used the MAX232 level converter chip to level shift.
Do check the polarity. If you get it wrong it will appear to work but the
timing will biased by the pulse width. (the falling edges is used if you
get it wrong.
albertson.ch...@gmail.com said:
The TTL level PPS did not work for me when I tried to drive a long cable.
I used the MAX232 level converter chip to level shift.
Thanks.
How long was the cable?
How solid was the driver? (How much of the problem was long cable vs weak
driver?)
--
These
Basically you just need an amplifier centered on 60 kHz.
On Friday, January 3, 2014 10:42 AM, Chuck Forsberg WA7KGX c...@omen.com
wrote:
I'd like to see a WWVB generator that could output the 60 KHz WWVB signal
through a sound card for the benefit of hard of hearing atomic clocks
by Oregon
Googling wwvb simulator I found this interesting module:
The “Chronvertor” Time Protocol Simulation Module(Released February 2013)
The Chronvertor is a module containing a very accurate battery backed Maxim
DS3231 RTC (Real Time Clock) chip working with a Microchip PIC Microcontroller
to
The line driver was a TTL inverter chip I was going through about 50 or
60 feet of cat-5 wire.
TTL level serial is always marginal, the specs say it should not work but
it does work most of the time.
I found a soave of DB9 connectors that have built-in MAX232 chips on ebay
for under $5. I use
On Fri, 3 Jan 2014 13:12:52 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
The TTL level PPS did not work for me when I tried to drive a long cable.
I used the MAX232 level converter chip to level shift.
Do check the polarity. If you get it wrong it will appear to work but the
albertson.ch...@gmail.com said:
The line driver was a TTL inverter chip I was going through about 50 or
60 feet of cat-5 wire. TTL level serial is always marginal, the specs say it
should not work but it does work most of the time.
Modern CMOS chips work much better than real TTL. Some CMOS
Hal,
Your plots don't show the wave being reflected by the cable end, and bouncing
back and forth.. Until settling down.
Without an end-termination the improperly terminated output of the Thunderbolt
will cause the signal to bounce back and forth..
If there is a 50 ohms termination, there
saidj...@aol.com said:
Your plots don't show the wave being reflected by the cable end, and
bouncing back and forth.. Until settling down.
Yes. I'll put up some nasty pictures if anybody wants an ugly example.
For that set of graphs, I tried to get rid of that sort of junk. I was
working
On 03/01/14 20:01, Glenn Little wrote:
At the station that I worked at, time code was recorded in the digital
video stream in the camera, but, was only used for editing.
The editors would use this time code to mark the segment end points.
There was no correlation to the camera time code and
On 02/01/14 16:27, BD Systems Inc. wrote:
Re: Measuring TV delays
There's more delay involved in a live feed than most people assume. Let's
start with the live feed or remote. Most live feeds with live crowds will use
a 9 - 10 sec delay to avoid FCC issues with language.
Only applies to
Hi Hal,
still pretty impressive results, thanks for sharing the data.
bye,
Said
In a message dated 1/3/2014 17:10:13 Pacific Standard Time,
hmur...@megapathdsl.net writes:
saidj...@aol.com said:
Your plots don't show the wave being reflected by the cable end, and
bouncing back and
Tom and Corby
Thanks for the help. I suspect that the 5060/5061 is perhaps as good as it
can get.
My other references such as the 3801 and Tbolt have it down now in the
1X10-11 region. Close to 1 but goes above and below. I did find the magical
cfield R to be 70 ohms and will have to calculate the
Interesting discussion re getting the 1PPS into a PC to synchronise a
timing program.
I use WSPR for ham radio and was wondering how to do this.
Can you tell me which (Windows) time synch programs can use the 1PPS on
DCD of the RS232 interface please?
Next step would be to build a variable
Can you tell me which (Windows) time synch programs can use the 1PPS
on DCD of the RS232 interface please?
To answer my own question:
Here's one...
http://www.visualgps.net/NMEATime/default.htm
There are a few others listed at
http://www.gpskit.nl/links-en.htm
Zim
On Fri, Jan 3, 2014 at 8:32 PM, Graeme Zimmer gzim...@wideband.net.auwrote:
Can you tell me which (Windows) time synch programs can use the 1PPS on
DCD of the RS232 interface please?
To answer my own question:
Here's one...
http://www.visualgps.net/NMEATime/default.htm
There are a few
Where those using the cat-5 wire as a twisted pair? If sothat's cheating
I was truing to send an RS232 signal down a cat 5 cable. That means Tx, Rx
Gnd and DCD. You need four wires for that, ethernet uses the other two
pair.I was using the pairs Ethernet does not use.
The solution was to
Unless you bring the 1pps in and synchronize with that, you are
probably better off just running NTP.
Yes, that is the idea.
I often don't have access to the Internet when running WSPR.
eg when operating portable in remote areas or marine.
Thanks . Zim
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