GPS phased arrays aren't new, nor is it necessary to physically steer
the antennae within the aray:
http://www.navsys.com/papers/0005004.pdf
Bruce
Magnus Danielson wrote:
On 03/08/2011 05:22 AM, Hal Murray wrote:
Since you are after timing off of the sat's, having antennas that move,
Hi,
GPS phased arrays aren't new, nor is it necessary to physically steer
the antennae within the aray:
http://www.navsys.com/papers/0005004.pdf
But would such a system help with the LNA overload due to a local
transmitter?
I would expect that using separately steered antennas with good
I looked at the data sheet of the sel-2407 and interestingly it states
demodulated IRIG-B, which seems a bit odd. Either it's a modulated code
i.e. a sinusoidal wave with amplitude modulation (usually about 3:1), or
it's what we call a DC code i.e pulse width data stream not superimposed on
the 1
That sounds neat. My recollection of SAW filters from many moons ago is that
they have a fair amount of insertion loss. One always has to consider
trade-offs. Do you know if it is placed after the antenna and before the
LNA, or, is it after the LNA? Also, you probably meant -159 dBm of
While I agree in general, with this (and often custom I/F cards get lost when
the PC goes back to IT for data protection), the E1740A info is on the
Agilent website. The manual
http://cp.literature.agilent.com/litweb/pdf/E1740-90005.pdf has the instruction
set and code examples. You need a VXI
Hi
If somebody wants to come up with modern 1740 software, I have a couple of them
to try it out on.
Bob
On Mar 8, 2011, at 7:52 AM, Robert Atkinson wrote:
While I agree in general, with this (and often custom I/F cards get lost when
the PC goes back to IT for data protection), the E1740A
Hi
Since the idea here is to keep an existing GPSDO running, the DGPS input stream
isn't an option. Same goes for per sat corrections. You just don't have access
to the stuff you need to get at inside the beast.
Bob
On Mar 8, 2011, at 1:30 AM, Magnus Danielson wrote:
On 03/08/2011 05:22 AM,
Can anyone confirm the control/reference voltage for an STP2145A OCXO?
The datasheet posted on eBay says 12V supply and 5V control voltage but
it looks like they just copied the one for the MV89A. If they are truly
the same spec that's fine but before I order it, I thought I'd see if
anybody
On 3/7/11 9:37 PM, Tom Van Baak wrote:
I think it's simple, at least in the nice/common cases. If the antenna
geometry has a point that everything swivels around, consider that to
the the location of the antenna. I think that covers the typical
alt-az mount:
On 3/7/11 10:27 PM, Chris Albertson wrote:
On Mon, Mar 7, 2011 at 7:34 PM, Bob Campli...@rtty.us wrote:
Hi
Since you are after timing off of the sat's, having antennas that move, either physically
or electrically seems like a problem. Any shift in the effective antenna location as you
On 3/8/11 4:24 AM, Pieter ten Pierick wrote:
Hi,
GPS phased arrays aren't new, nor is it necessary to physically steer
the antennae within the aray:
http://www.navsys.com/papers/0005004.pdf
But would such a system help with the LNA overload due to a local
transmitter?
I would expect that
Anyone have the old MS based software as a 'seed' to writing a new i/f ?
If I did it it would probable be first in Perl or Python then parts
may then be redone in C. The work would be done in a Linux environment
in that I don't have any uSoft other then the PC that runs the
schematic and PCB
Hello,
Has anyone out there circuit diagrams for a HP8713C network analyzer?
The generate port is fine, but the transmission or RF IN port is faulty
below about 1.5 GHz. It's response is all over the place. Above 1.5 GHz it
seems to be fine.
I suspect the A5 receiver especially the RF input
Hi,
There are HP Basic examples in the manual. Shame it's a C size, I've a 1300B
frame that has an HP-IB interface as standard, but is only B size.
Robert G8RPI.
--- On Tue, 8/3/11, Pete Lancashire p...@petelancashire.com wrote:
From: Pete Lancashire p...@petelancashire.com
Subject: Re:
Robert,
I've attached the data sheet for the STP2145A. The device is 12V
operated, and has an internal 8V reference which you can use to supply
the EFC circuit.
Have a look at http://www.qsl.net/zl1bpu/MICRO/SIMPLE/SimpleGPS.htm,
where I describe a simple home-brew GPS Disciplined Reference based
Hi Jim,
As part of my research into keeping time on rockets and spacecraft, I joined
this list to see what I could learn from the masters. Of course I'm a
knuckle-head for not assuming that you'd be one of the resident masters
grin. Anyway, as my accuracy needs are modest (~10uS across many
Murray,
Thank you very much for the datasheet. That confirms my suspicion about what
was posted on eBay. For my application I actually need the 5V control voltage
because I'm planning on using it with my Datum bc635PCI and TS2100. It's way
too large for either unit but for the PCI card I can
jimlux wrote:
On 3/8/11 4:24 AM, Pieter ten Pierick wrote:
Hi,
GPS phased arrays aren't new, nor is it necessary to physically steer
the antennae within the aray:
http://www.navsys.com/papers/0005004.pdf
But would such a system help with the LNA overload due to a local
transmitter?
I
Mike,
The saw filter is between the antenna and the LNA. You're correct as
to the sensitivity measurement; it is -146 dBm acquisition and -159
dBm tracking. It also specs 1PPS accuracy of 22ns, 1 - sigma.
Here is a link to the data sheet:
Hi,
I recently noticed something interesting: The DMTD measurement gives a set
of phase values x(t). From which fractional frequency y(t) is calculable. So
now it seems viable to plot the spectrum, Sy(f) and if you scale it properly
you arrive at Sphi(f). If I'm not making a gross error
Stephan Sandenbergh wrote:
Hi,
I recently noticed something interesting: The DMTD measurement gives a set
of phase values x(t). From which fractional frequency y(t) is calculable. So
now it seems viable to plot the spectrum, Sy(f) and if you scale it properly
you arrive at Sphi(f). If I'm not
On Tue, Mar 8, 2011 at 9:57 AM, Kevin Watson time-n...@enuuf.com wrote:
Hi Jim,
As part of my research into keeping time on rockets and spacecraft, I joined
this list to see what I could learn from the masters. Of course I'm a
knuckle-head for not assuming that you'd be one of the resident
On 03/08/2011 07:46 PM, Stephan Sandenbergh wrote:
Hi,
I recently noticed something interesting: The DMTD measurement gives a set
of phase values x(t). From which fractional frequency y(t) is calculable. So
now it seems viable to plot the spectrum, Sy(f) and if you scale it properly
you arrive
http://tinyurl.com/4ktxlaw
http://www.newscientist.com/article/dn20202-gps-chaos-how-a-30-box-can-jam-you
r-life.html?full=true
It starts with a story about a 2007 Navy exercise in San Diego. Two ships
jammed radios to simulate communications troubles and wiped out a lot of
nearby
There is an interesting article in the March 2011 Electronic Products
magazine design an ultra low noise supply for analog circuits. It is a
combination of switcher and LDO's and written by P Hunter TI so it may also be
available on their site.
Bert Kehren
At 16:41 -0500 08-03-2011, ewkeh...@aol.com wrote:
There is an interesting article in the March 2011 Electronic Products
magazine design an ultra low noise supply for analog circuits. It is a
combination of switcher and LDO's and written by P Hunter TI so it
may also be available on their
Here:
http://www2.electronicproducts.com/Designing_an_ultra_low_noise_supply_for_analog_circuits-article-fapo_TI_mar2011-html.aspx
- Henry
--
ehydra.dyndns.info
ewkeh...@aol.com schrieb:
There is an interesting article in the March 2011 Electronic Products
magazine design an ultra low noise
This is not a low noise PS, IMO. There is far too much ripple on the
outputs for that.
Furthermore, I'd bet it has real radiated EMI issues.
-John
=
At 16:41 -0500 08-03-2011, ewkeh...@aol.com wrote:
There is an interesting article in the March 2011 Electronic Products
magazine
I had this problem when using some ultra low light imagers. They have NO PSRR,
and the integration times were up in the 1-3 second range, so any noise on the
pixel supply ended up in the image.
I used an ICL-9000 regulator which has ultra high PSRR, and I used a switcher
running at a specific
I used an ICL-9000 regulator
ISL-9000. Sorry.
http://www.intersil.com/products/deviceinfo.asp?pn=ISL9000
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Hi All. Thanks for responding. There are quite a few GPS receivers that will
work outside of the usual commercial-grade GPS limitations, but I'm not too
sure I need such a receiver. As my application is to just accuratly time-tag
messages for a data recorder, my thinking is to allow a
This is a surprise:
in reality more than 90 percent of the users of GPS worldwide use it
primarily for a timing reference.
That makes the LORAN shutdown look even more idiotiuc!
-John
==
Copied from http://www.gpsworld.com/defense/gps-insights-april-2007-8428:
I
On 03/09/2011 06:08 AM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitations, but I'm
not too sure I need such a receiver. As my application is to just
accuratly time-tag messages for a data
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