hink
> > > > there are still a
> > > >
> > > > few stations (low power) around. You might still be able to use that
> > > > signal, IF you can
> > > >
> > > > dig it out of your old analog TV. ;-) I do have analog tv's hook
still a
> > >
> > > few stations (low power) around. You might still be able to use that
> > > signal, IF you can
> > >
> > > dig it out of your old analog TV. ;-) I do have analog tv's hooked up
> > to
> > > my cable
> > >
oked up
> to
> > my cable
> >
> > box - I suspect that live broadcasts would still have an accurate color
> > burst, so maybe
> >
> > I think the other methods discussed here (ie, GPS) would provide easier
> > and more
> >
> > reliable timing sources
--Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Thursday, February 09, 2012 4:17 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Using digital broadcast TV for timing?
On 02/09/2012 07:21 PM, Chris Albertson wrote:
On
: Thursday, February 09, 2012 4:17 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Using digital broadcast TV for timing?
On 02/09/2012 07:21 PM, Chris Albertson wrote:
> On Wed, Feb 8, 2012 at 11:02 PM, Hal Murray
wrote:
>>
>>> Other than LightSquared, an event that made GPS
On 02/09/2012 07:21 PM, Chris Albertson wrote:
On Wed, Feb 8, 2012 at 11:02 PM, Hal Murray wrote:
Other than LightSquared, an event that made GPS go away would most likely
eliminate most interest in ultra accuracy time keeping.
By "went away", I meant locally, as be being jammed or spoof
On Wed, Feb 8, 2012 at 11:02 PM, Hal Murray wrote:
>
>> Other than LightSquared, an event that made GPS go away would most likely
>> eliminate most interest in ultra accuracy time keeping.
>
By "went away", I meant locally, as be being jammed or spoofed.
Possibly a car drives into a tunnel and t
> Other than LightSquared, an event that made GPS go away would most likely
> eliminate most interest in ultra accuracy time keeping.
But this is time nuts.
I think it's interesting to consider where we might get a second source of
time or frequency frequency. How good is it? What does it co
p pockets.
Jerry Finn
AG6HH
From: Chris Albertson
To: jerryfi ; Discussion of precise time and frequency
measurement
Sent: Wednesday, February 8, 2012 9:13 PM
Subject: Re: [time-nuts] Using digital broadcast TV for timing?
On Wed, Feb 8, 2012 at 7:48 PM, jerryfi wrote:
&g
Other than LightSquared, an event that made GPS go away would most likely
eliminate most interest in ultra accuracy time keeping.
On 02/08/2012 09:13 PM, Chris Albertson wrote:
On Wed, Feb 8, 2012 at 7:48 PM, jerryfi wrote:
Thanks Paul. You and Bob Camp provided some good updates/info. It ma
On Wed, Feb 8, 2012 at 7:48 PM, jerryfi wrote:
> Thanks Paul. You and Bob Camp provided some good updates/info. It may
> present enough of a challenge/reward for someone to examine further. I'm
> with you on the available time front - too many other projects/commitments to
> pursue further m
meone else, can make some
headway though.
Jerry
AG6HH
From: paul swed
To: jerryfi ; Discussion of precise time and frequency
measurement
Sent: Wednesday, February 8, 2012 7:07 PM
Subject: Re: [time-nuts] Using digital broadcast TV for timing?
All gone
t;
>
> Trying to locate the appropriate signal(s) in a digital TV today would be
> interesting.
>
> Just as a historical aside.
>
>
>
> Jerry Finn
> Santa Maria, CA
>
>
>
> > Date: Tue, 7 Feb 2012 18:01:26 -0800
> > From: Chris Albertson
> >
the appropriate signal(s) in a digital TV today would be
> interesting.
>
> Just as a historical aside.
>
>
>
> Jerry Finn
> Santa Maria, CA
>
>
>
> > Date: Tue, 7 Feb 2012 18:01:26 -0800
> > From: Chris Albertson
> > To: Discussion of pr
012 4:43 PM
> Subject: Re: [time-nuts] Using digital broadcast TV for timing?
>
> Hi
>
> The whole cesium lock approach died back in the 90's. These days your local
> station buffers / retimes / reframes everything. If you are lucky they use a
> Rb for the timing.
On 02/08/2012 05:41 AM, David McGaw wrote:
The DTV signal coding has a major problem in that it is not
deterministic - they can't even synchronize the audio and video. There
have been many workshops on this at the Audio Engineering Society
conventions. I doubt there is any useable timing in it.
be
> interesting.
>
> Just as a historical aside.
>
>
>
> Jerry Finn
> Santa Maria, CA
>
>
>
>> Date: Tue, 7 Feb 2012 18:01:26 -0800
>> From: Chris Albertson
>> To: Discussion of precise time and frequency measurement
>>
>&g
> To: Discussion of precise time and frequency measurement
>
> Subject: [time-nuts] Using digital broadcast TV for timing?
> Message-ID:
>
> Content-Type: text/plain; charset=ISO-8859-1
>
> GPS requires a good view of the sky, Hard to do in say the 7th floor
>
Albertson
Sent: Tuesday, February 07, 2012 9:01 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Using digital broadcast TV for timing?
GPS requires a good view of the sky, Hard to do in say the 7th floor
of a 40 story building if you have no windows. I'm wondering
boun...@febo.com] On
Behalf Of Hal Murray
Sent: Wednesday, February 08, 2012 6:01 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Using digital broadcast TV for timing?
> Maybe cell site transmissions are better?
At least one company makes them.
http://t
Maybe cell site transmissions are better?
Raj
>The plan is to try and phase lock a local oscillator and use a very
>long time constant on the loop filter. I bet the TV transmitters are
>locked to GPS and over a long enough time are as good as GPS. Also in
>many cities there are many TV transm
albertson.ch...@gmail.com said:
> The plan is to try and phase lock a local oscillator and use a very long
> time constant on the loop filter. I bet the TV transmitters are locked to
> GPS and over a long enough time are as good as GPS. Also in many cities
> there are many TV transmitters, shou
On 2/7/12 6:01 PM, Chris Albertson wrote:
GPS requires a good view of the sky, Hard to do in say the 7th floor
of a 40 story building if you have no windows. I'm wondering about
using the new digital TV signals for timing.
I'm pretty sure there is time code in the signal and I'm pretty sure
t
The DTV signal coding has a major problem in that it is not
deterministic - they can't even synchronize the audio and
video. There have been many workshops on this at the Audio
Engineering Society conventions. I doubt there is any useable timing in it.
David McGaw
At 09:01 PM 2/7/2012, Chri
You might be able to find the PCR clock at 90kHz, but.. PCR clocks are usually
just decent oscillators, nothing special.
> GPS requires a good view of the sky, Hard to do in say the 7th floor
> of a 40 story building if you have no windows. I'm wondering about
> using the new digital TV sig
GPS requires a good view of the sky, Hard to do in say the 7th floor
of a 40 story building if you have no windows. I'm wondering about
using the new digital TV signals for timing.
I'm pretty sure there is time code in the signal and I'm pretty sure
the bits are clocked at a very accurate rate.
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