radio up to about 50 feet away.
Cheers, Graham
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Camp
Sent: November 22, 2010 20:38
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS jamming
On 23/11/10 13:36, Bob Camp wrote:
Hi
If you are going to depend on any form of over the air timing, you need holdover. It's
not a option its a requirement. There are simply to many things that can
create issues with the signal you are using. That's true of any over the air system, not
just
you rarely if ever see.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Tuesday, November 23, 2010 8:05 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS jamming susceptibility
On 23/11/10 13:36, Bob
On 23/11/10 14:17, Bob Camp wrote:
Hi
Most telecom systems are still a timing monoculture. All of their sources
of time are duplicates of the same thing. There are multiple categories of
trouble that will affect all of their sources. Redundancy with multiple
types of timing is what would make a
I read that Phrack article and their jammer is much more sophisticated
than mine. Mine is just a sweeper. I don't even know yet the sweep
rate. I was thinking more along the lines of theirs. Something that
actually put out a signal that contained at least some aspects of the
signal they were
John Green wrote:
jamming anyone's GPS. A while back, I was looking at one of those
It doesn't look capable of putting out
more than 50 milliwatts or so into a 2 inch antenna
The GPS antenna is perhaps 35 feet away
with a cinder block wall, a brick wall, and a metal roof in between. I
also
John Green wrote:
I read that Phrack article and their jammer is much more sophisticated
than mine. Mine is just a sweeper. I don't even know yet the sweep
rate. I was thinking more along the lines of theirs. Something that
actually put out a signal that contained at least some aspects of the
scmcgr...@gmail.com wrote:
The Phrack article's jammer attacks the offset frequencies.
Phrack.org/issues.html?issue=60id=13
This article shows just how vulnerable L1 GPS is
I'm not very impressed by design...
That old Freescale/Motorola MC145151 PLL, and using a separate
prescaler? That's
On 23/11/10 16:12, jimlux wrote:
scmcgr...@gmail.com wrote:
The Phrack article's jammer attacks the offset frequencies.
Phrack.org/issues.html?issue=60id=13
This article shows just how vulnerable L1 GPS is
I'm not very impressed by design...
That old Freescale/Motorola MC145151 PLL, and
Sent: Tuesday, November 23, 2010 9:37 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS jamming susceptibility
John Green wrote:
jamming anyone's GPS. A while back, I was looking at one of those
It doesn't look capable of putting out
more than 50
In the RC Model Airplane world where some brave souls are experimenting with
autonoumous (UAV) flight , it is usual that they have a part-15 video downlink
and/or telemetry at 900mhz or 2.4ghz and unless you put a trap on the input to
the GPS receiver to significantly reduce those frequencies
Given that this is an extremely sensitive topic and completely illegal
also, let me just state at the outset that I have no interest in
jamming anyone's GPS. A while back, I was looking at one of those
Chinese discount electronics websites, I'm sure we all have, and
noticed a GPS jammer for sale.
Hi
There is *very* little signal hitting the ground from a normal GPS bird. Even a
few mili watts close at hand is going to be an enormous overload. The typical
GPS does not use a lot of bits in the front end A/D.
I suspect that if you tuned your little gizmo down to the FM broadcast band, it
On 11/23/2010 12:19 AM, Bob Camp wrote:
Hi
There is *very* little signal hitting the ground from a normal GPS bird. Even a
few mili watts close at hand is going to be an enormous overload. The typical
GPS does not use a lot of bits in the front end A/D.
I suspect that if you tuned your
...@febo.com
Date: Tue, 23 Nov 2010 01:29:56
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] GPS jamming susceptibility
On 11/23/2010 12:19 AM, Bob Camp wrote:
Hi
There is *very* little signal hitting
Sender: time-nuts-boun...@febo.com
Date: Tue, 23 Nov 2010 01:29:56
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] GPS jamming susceptibility
On 11/23/2010 12:19 AM, Bob Camp wrote:
Hi
There is *very
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