Hi,
First I'm in the UK so this does not directly affect me. I do have some
slightly independent comments.
Firstly the Garmin tests seemed very reasonable and erred to favor
LightSquared. They were free field in an anecohic chamber. There was an L1
notch filter in the output of the
http://www.gpsworld.com/gnss-system/news/data-shows-disastrous-gps-jamming-fcc-approved-broadcaster-11029?utm_source=GPSutm_medium=emailutm_campaign=Navigate_01_31_2011utm_content=data-shows-disastrous-gps-jamming-fcc-approved-broadcaster-11029
Sounds like the planning folk here in the UK who
The company, Lightsquared, has stated that it will work with the GPS
industry to see which GPS equipment needs filtering so that they don't
look into our band.
Oh, so we get to buy new gear because they want to interfere. Perhaps we
should turn the FCC into an engineering organization rather
OK the threads run long enough and time to clarify all of this for everyone.
See its all about business and cost.
Currently the GPS service is a huge reoccurring open ended cos. Now we have
convinced everyone else in the world that they have to have the equivalent
or better system there are at
, 2011 12:17:27 AM
Subject: Re: [time-nuts] From GPS World - Lightsquared has been given the
goahead
http://www.gpsworld.com/gnss-system/news/data-shows-disastrous-gps-jamming-fcc-approved-broadcaster-11029?utm_source=GPSutm_medium=emailutm_campaign=Navigate_01_31_2011utm_content=data-shows
On 2/2/11 6:31 AM, Mark Spencer wrote:
Hopefully timing receivers using elevated gps antennas with band pass filtering
(ie. the 58532A or equivalent..) and a good sky view and strong signal levels
will be more resistant to out of band interference than a typical consumer grade
portable GPS with
At 09:45 AM 2/2/2011, jimlux wrote...
what was interesting is that the jamming/fail to get fix was at a
closer distance for the consumer receiver than for the FAA approved
receiver for aircraft. Maybe it's better signal processing in the
(presumably newer) consumer receiver.
Or maybe they
On 2/2/11 7:14 AM, Mike S wrote:
At 09:45 AM 2/2/2011, jimlux wrote...
what was interesting is that the jamming/fail to get fix was at a
closer distance for the consumer receiver than for the FAA approved
receiver for aircraft. Maybe it's better signal processing in the
(presumably newer)
2, 2011 6:45:29 AM
Subject: Re: [time-nuts] From GPS World - Lightsquared has been given the
goahead
what was interesting is that the jamming/fail to get fix was at a closer
distance for the consumer receiver than for the FAA approved receiver
for aircraft. Maybe it's better signal processing
likely have
a
shorter product cycle. This may lead to more issues in timing
applications.
- Original Message
From: jimlux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Wed, February 2, 2011 6:45:29 AM
Subject: Re: [time-nuts] From GPS World - Lightsquared has been given
On Wed, Feb 2, 2011 at 9:29 AM, Don Latham d...@montana.com wrote:
so, once the safety of life equipment is in place, with controlled
purchase of receivers no doubt, the consumer signals can be shut off at
will. And we're SOL. Neat.
That is why the Russians and EU are each spending
product cycle. This may lead to more issues in timing
applications.
- Original Message
From: jimlux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Wed, February 2, 2011 6:45:29 AM
Subject: Re: [time-nuts] From GPS World - Lightsquared has been given the
goahead
what
GPS World - Lightsquared has been given
the
goahead
what was interesting is that the jamming/fail to get fix was at a closer
distance for the consumer receiver than for the FAA approved receiver
for aircraft. Maybe it's better signal processing in the (presumably
newer) consumer
I wonder how much advancement has occurred in
timing receivers over the years versus consumer devices which likely have
a shorter product cycle. This may lead to more issues in timing
applications.
Many timing receivers already have decent anti-jam features. They
were designed for use on
On Wed, Feb 2, 2011 at 10:02 AM, paul swed paulsw...@gmail.com wrote:
True enough there will be three systems heck many channels also.
But that reality actually means my magical HP 3801 may not work or could
become unreliable at best.
So how do we hack those new receivers for time-nuts
Chris wrote:
A notch filter can also be constructed to notch out the jammer if it
is out of band. A twin T design might be effective and low cost
Unfortunately, unless the interfering carrier is much too far away to
be a problem in the first place, the phase shift of the notch filter
(and
On Wed, Feb 2, 2011 at 1:01 PM, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
Chris wrote:
A notch filter can also be constructed to notch out the jammer if it
is out of band. A twin T design might be effective and low cost
Unfortunately, unless the interfering carrier is much
Most GPS users care about position, not time.
-John
===
Chris wrote:
A notch filter can also be constructed to notch out the jammer if it
is out of band. A twin T design might be effective and low cost
Unfortunately, unless the interfering carrier is much too far away to
be
Of the 2 lc orgs I administer or am a member of, and the roughly 8 other lc
orgs I interact with on a regular basis, only one uses lc certified gps equip.
The others are all consumer grade or don't use gps.
However, a slew of filings and letters from the lc community might not be a bad
On 2/2/2011 2:29 PM, bownes wrote:
Of the 2 lc orgs I administer or am a member of, and the roughly 8 other lc
orgs I interact with on a regular basis, only one uses lc certified gps equip.
The others are all consumer grade or don't use gps.
However, a slew of filings and letters from the lc
Sorry. Life critical. Fire, ems, law enforcement, aviation, etc.
On Feb 2, 2011, at 3:37 PM, Rex r...@sonic.net wrote:
On 2/2/2011 2:29 PM, bownes wrote:
Of the 2 lc orgs I administer or am a member of, and the roughly 8 other lc
orgs I interact with on a regular basis, only one uses lc
Joe,
The only thing they are worth is a 6 inch linear accelerator.
73BillWB6BNQ
Joseph Gray wrote:
Reading the article, it sure smells like something is going on and
it
doesn't smell good. What's the going price for an FCC official, a
Congressman,
You left out IBOC, especially IBOC on AM at night. The FCC brass has zero
technical knowledge.
-Original Message-
From: x...@darksmile.net
Sender: time-nuts-boun...@febo.com
Date: Tue, 01 Feb 2011 19:17:40
To: Discussion of precise time and frequency measurementtime-nuts@febo.com;
23 matches
Mail list logo
