Tim,
Can you describe your test setup used to measure the Phase Noise Plots
you show in the links provided.
Are you using the 8566B to measure the Phase Noise directly, or are you using
a Phase Noise test set to make the measurements?
Thanks
Jerry
At 08:33 PM 6/4/2012, you wrote:
>On 3/06/2012
The low-E coatings are known to attenuate WIFI. WIFI is probably a worse case
than GPS, but the availability of the gear makes experimenting easy. I think
they are sputtered metal either on the glass or on a thin film applied to the
glass. Southwall Technology in Palo Alto pioneered or at least
On 6/4/12 10:44 PM, Chris Albertson wrote:
On Mon, Jun 4, 2012 at 10:18 PM, Hal Murray wrote:
What is the significance of the pointy tops of the long skinny antennas?
Guessing. Terminates the end of the conductor to prevent a discontinuity
and reflection
more likely it's for structural
On 6/4/12 10:24 PM, Hal Murray wrote:
Does window glass have significant attenuation at GPS L1?
What if it's a big window on a modern green office building and has some sort
of coating/content to reduce IR transmission?
Google found an (expensive) paper from IEEE where the abstract said:
At
On Mon, Jun 4, 2012 at 10:18 PM, Hal Murray wrote:
>
> What is the significance of the pointy tops of the long skinny antennas?
>
Guessing. Terminates the end of the conductor to prevent a discontinuity
and reflection
How about the collars at the base of them?
>
Another guess: They kill multi
Slightly off-topic, the first time I was aware of polarisation error was
during the very first trans-Atlantic TV tests. On the first night,
signals were fine in France (who had a copy of the US antenna), but poor
in the UK who had designed and built their own antenna). UK changed
polarisation
Part of the problem of using a window would remain even if the glass where
removed. This is the antenna can not "see" the entire sky from a window.
You can do "ok" if the window faces South (assume you are in the Northern
Hemisphere) With a good timing GPS receiver you only need to see a very
sm
Does window glass have significant attenuation at GPS L1?
What if it's a big window on a modern green office building and has some sort
of coating/content to reduce IR transmission?
Google found an (expensive) paper from IEEE where the abstract said:
At average, about 30 dB attenuation is obs
t...@leapsecond.com said:
> http://www.ausairpower.net/Block-IIR-M-SV-1S.jpg
What is the significance of the pointy tops of the long skinny antennas?
How about the collars at the base of them?
--
These are my opinions. I hate spam.
___
time-nu
On 05/06/12 04:51, Dave Martindale wrote:
Well, they could be consistent.
Most of those photos show only two sizes of helix-type antennas. The
larger diameter (probably lower frequency) are quadrifilar helix designs,
and they are uniformly "left hand thread" helixes. (I assume that everyone
ag
A law firm with a technology department?
-Dave
- Original Message -
From: "Michael Blazer"
To: time-nuts@febo.com
Sent: Monday, June 4, 2012 7:44:26 PM
Subject: Re: [time-nuts] LightSquared in the news again
It's not a technology company if it has more lawyers than engineers.
M
Well, they could be consistent.
Most of those photos show only two sizes of helix-type antennas. The
larger diameter (probably lower frequency) are quadrifilar helix designs,
and they are uniformly "left hand thread" helixes. (I assume that everyone
agrees on what a left-hand thread looks like,
It's not a technology company if it has more lawyers than engineers.
Mike
On 6/4/2012 7:33 PM, Eric Williams wrote:
Typical of technology companies that have more lawyers on staff than
engineers.
On Mon, Jun 4, 2012 at 5:09 PM, Tom Knox wrote:
Lightsquared is like a cockroach every time you
Not quite.
"The definition of right-hand circular polarization, as standardized by
the IRE... is as follows: For an observer looking in the direction of
propagation, the rotation of the electric-field vector in a transverse
plane is clockwise." - Jasik, "Antenna Engineering Handbook", First
Edit
This is a subject I have some familiarity with. A helix antenna which is
right hand for receive is also right hand for transmit. Think of it this
way. If you have a bolt with a nut on it and you turn the nut to the right
it will move along the bolt away from you. If you turn the bolt around
Or like a Burmese python. They come back and strangle everything. Then eat
them.
On Mon, Jun 4, 2012 at 8:33 PM, Eric Williams wrote:
> Typical of technology companies that have more lawyers on staff than
> engineers.
>
> On Mon, Jun 4, 2012 at 5:09 PM, Tom Knox wrote:
>
> >
> > Lightsquared is
Typical of technology companies that have more lawyers on staff than
engineers.
On Mon, Jun 4, 2012 at 5:09 PM, Tom Knox wrote:
>
> Lightsquared is like a cockroach every time you think it is dead it shows
> up again.
>
> Thomas Knox
>
> 1-303-554-0307
>
> > Date: Mon, 4 Jun 2012 19:25:22 -0400
David,
One of these two photos is correct (odd isn't it)...
http://www.ausairpower.net/Block-IIR-M-SV-1S.jpg
http://www.ausairpower.net/Block-IIR-M-SV-2S.jpg
Maybe these break the tie:
http://www.spacemankind.com/images/ms/20090817-lockheed-gps-iir-lr.jpg
https://share.sandia.gov/news/resources/r
I don't think that's correct. A right-hand spiral (however you define
right-hand) remains right-handed if you rotate the whole object in space so
the centre axis of the spiral points in the opposite direction. A
right-handed spiral is converted to a left-handed one only by reflecting it
in a mirr
Lightsquared is like a cockroach every time you think it is dead it shows up
again.
Thomas Knox
1-303-554-0307
> Date: Mon, 4 Jun 2012 19:25:22 -0400
> To: time-nuts@febo.com
> From: charles_steinm...@lavabit.com
> Subject: [time-nuts] LightSquared in the news again
>
> From today's communic
On 05/06/12 00:30, Dr. David Kirkby wrote:
This is not exactly a time related question, but I'm sure the subject
must be of interest to time-nuts using GPS.
If one transmits from an antenna such as a helical one, RHCP, can the
same antenna be used for reception, or does the helix need to be woun
From today's communications news (fair use):
LightSquared stressed its intention to deploy a nationwide 4G
wireless broadband network, during a meeting with Angela Giancarlo,
chief of staff to FCC Commissioner Robert McDowell. The commission
has some legal and policy responses it can take "to
This is not exactly a time related question, but I'm sure the subject must be of
interest to time-nuts using GPS.
If one transmits from an antenna such as a helical one, RHCP, can the same
antenna be used for reception, or does the helix need to be wound the other way?
If you google this topi
Hi,
I have (4) DC503 for parts, all have good aluminum front panels one has a
good plastic frame around the front panel. I am not sure about the
operating condition but would check for you this evening.
Make me an offer. Shipping would be from zip code 17404 PA
Jeff
-Original Message-
Hi,
If anybody has any busted Tek counters sitting somewhere, I'm looking for
the following:
DC503- NOT a DC503A- with a good aluminum front panel. All else can be
trash.
DC509- With all good LED displays (3x DL883A). All else can be NG.
If you've got either described above, please email off
On Sun, 03 Jun 2012 18:16:15 -0400, Bob Camp wrote:
> Hi
>
> As long as it shows "rev E" or "rev D" it's likely a later version unit.
> The date code on the OCXO is the best indicator, but even that's not
> 100%. As long as it's one made after about 2002 you will have a good
> one.
>
Search on E
As noted above the propagation can make quite a mess of things.
When wwvb launched way back there was a HP journal showing that in NY city
you could establish something like 1 X 10-7th as I recall.
I have seen all the propagation twists and turns.
I suppose if you were 300-400 miles from the transm
Le 4 juin 2012 à 05:43, David I. Emery a écrit :
> On Sun, Jun 03, 2012 at 09:20:59AM -0700, J. Forster wrote:
>> Is there any indication the carriers of WWVB and MSF are locked together?
>>
>> -John
>>
>> =
>
> Given it's only 60 KHz and certainly somewhere north of part
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