aside.
Jerry Finn
Santa Maria, CA
Date: Tue, 7 Feb 2012 18:01:26 -0800
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital
Feb 2012 18:01:26 -0800
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital broadcast TV for timing?
Message-ID:
cabbxvhvb3skzumx+bdykttesgzuf2k5hsjwypdkk+rqoarx
and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital broadcast TV for timing?
Message-ID:
cabbxvhvb3skzumx+bdykttesgzuf2k5hsjwypdkk+rqoarx...@mail.gmail.com
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GPS requires a good view
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 Wed, Feb 8
: 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 Murrayhmur...@megapathdsl.net
wrote:
Other than LightSquared, an event that made GPS go
On Wed, Feb 8, 2012 at 11:02 PM, Hal Murray hmur...@megapathdsl.net 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
On 02/09/2012 07:21 PM, Chris Albertson wrote:
On Wed, Feb 8, 2012 at 11:02 PM, Hal Murrayhmur...@megapathdsl.net 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
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
] 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://tinyurl.com/72j5e6n
http
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 about
of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital broadcast TV for timing?
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GPS requires a good view of the sky
...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital broadcast TV for timing?
Message-ID:
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GPS
18:01:26 -0800
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital broadcast TV for timing?
Message-ID:
cabbxvhvb3skzumx+bdykttesgzuf2k5hsjwypdkk+rqoarx...@mail.gmail.com
, CA
Date: Tue, 7 Feb 2012 18:01:26 -0800
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Using digital broadcast TV for timing?
Message-ID:
cabbxvhvb3skzumx+bdykttesgzuf2k5hsjwypdkk
On Wed, Feb 8, 2012 at 7:48 PM, jerryfi jerryfi...@yahoo.com 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
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, jerryfijerryfi...@yahoo.com wrote:
Thanks Paul. You and Bob Camp provided some good
From: Chris Albertson albertson.ch...@gmail.com
To: jerryfi jerryfi...@yahoo.com; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Wednesday, February 8, 2012 9:13 PM
Subject: Re: [time-nuts] Using digital broadcast TV for timing?
On Wed, Feb 8, 2012
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
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
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
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,
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
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, should
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