Crosstalk? With the same signal?
On Tue, Oct 9, 2012 at 4:31 AM, Edgardo Molina xe1...@amsat.org wrote:
Dear Group,
Good evening. I just arrived home after the first day of conferences at
the Electrical Metrology Forum 2012 at Mexico's metrology center CENAM. I
attended several
I was wondering about that myself, but my guess is the crosstalk would
be from whatever grunge was coming from the other GPS. Every amplifier
has reverse parameters, so a small amount of the crud (circuitry noise)
from one GPS will reach the other GPS. Not much, but some people are
nuts about
This article discusses timing errors due to mismatch and multiple
reflections in transmissin lines:
http://www.dtic.mil/dtic/tr/fulltext/u2/a508044.pdf
Adrian
Edgardo Molina schrieb:
Dear Group,
Good evening. I just arrived home after the first day of conferences at the
Electrical Metrology
Hi all,
In my shack I have a single antenna with two power splitter in series
because I need several ports for the four GPSDO and spare port for
occasional testing.
1.1 They argued that cross talk could happen among ports. I doubt it
with the newer models. I have experience with
Is there any difference between what a GPS receiver can receve via
crosstalk or receive directly from the antenna? In my opinion crosstalk is
absolutely less than the last argument about GPS antenna splitters.
On Tue, Oct 9, 2012 at 9:58 AM, Timeok tim...@timeok.it wrote:
Hi all,
In my shack
I agree,
Luciano
timeok
Il 2012-10-09 10:41 Azelio Boriani ha scritto:
Is there any difference between what a GPS receiver can receve via
crosstalk or receive directly from the antenna? In my opinion
crosstalk is
absolutely less than the last argument about GPS antenna splitters.
On Tue, Oct
When GPS first started to be fitted to light aircraft it was found that LO
leakage from some VHF navigation recivers blocked the GPS when the NAV was on
certain channels. You can buy a BNC T adaptor where the leg of the T is a
1.5GHz coax stub notch filter. They go on the NAV RX antenna
Lots of comments. Indeed it sounds like a great discussion for pizza and
beer. The more beer the more lively. Did they bring beer?
Fact
I have used a 8 way splitter Sat/TV for 5 years now. Port to port loss is
something like 16 db or 26 db as I recall. It has dc blocking on all but 1
port built
Paul,
I am convinced your realization work very well and it is a lower cost
in the market.
But depend what kind of user have to use the device.
For a standard laboratory or a company I am sure is not sufficent your
realization, for an hobbist yes, can be.
Business or research company want
I'm looking for an off the shelf commercial time display (or combination
of displays)..
Needs to display at least 3 zones, in 24 hr form (UTC, Pacific,
Eastern), and should display Day of Year, as well.
I can feed timecode to it, or even better, if it can ingest NTP. 1
second precision is
Hello All -
I do not believe there is a hard Yes or No answer for this question.
It depends upon the performance specification of the system elements
and the system requirements.
For instance if the leakage of noise and discrete signals from each
receiver out
of the antenna port combined with
I like the Symmetricom ND-4, however I don't know if you can have it
alternate between TZs. You can buy more than one and label them like
I did.
http://www.symmetricom.com/products/gps-solutions/time-code-displays/Network-Time-Displays/
They can get NTP server and timezone through DHCP options,
Hi
If you look at the way NIST sets up one of their time modem installations,
they do indeed worry a lot about this sort of stuff. There's a major choke /
isolator between the antenna and the feed line. The claim is that they see
in building grunge causing trouble without it. I'm sure that will
Yes indeed its a depends since in the original thread there was not a
specific requirement.
But as you say its a design. If you do not want to design makes more sense
to grab a ebay wonder I suspect. For me I had fun designing and saving a
buck. 8 ports verses 2...
Regards
Paul
WB8TSL
On Tue, Oct
I believe it is possible for splitters to be invisible to your system. My first
choice would be multiple Antennas. But if you have multiple GPS receivers and
require outputs to your test bench, splitters are the logical choice. That said
the splitter adds complexity to the system and
For wall displays, I've noticed more and more people simply mounting a
large HD TVs to the wall and driving it with a computer. Even the
menu board in back of Starbucks and the directory near the elevator
that lists who is in what room on that floor. I've seen the 9:16 TVs
mounted vertically
I have two La Crosse wall-mounted atomic clocks, one is set for local time
(Mountain) and the other to UTC. They both are synchronized to WWVB and display
the same time to the second (by eyeball). However when I tuned in WWV on 5 MHz
(it's only about a 100 miles away so the higher
Suppose I wanted to do an experiment with GPS receivers: Is setup A better
than setup B? But they share some parts, say the antenna, so I can't run
them both at the same time.
How long do I have to collect data for each setup to tell which is better?
Is that even the right question? I'm
Hi,
I'm currently using a GWBasic program at 9600 Baud to get 1 second T.I.
data (12 digits) from an SR620 counter, display the reading , put the
reading into a file, name the file sequentialy, and either save or delete
the file via a function key.
I'm switching to a new counter that outputs at
Great question
I think the newer basics have no problem with that rate and also many more
com ports.
I seem to recall liberty basic free and for $59 you get a distro license or
more lines of code or something.
The basics out their seem pretty capable these days. You still have Windows
VB also.
Hi Corby I havent checked Liberty Basic but I believe it does support
57.6kBd.. I have definitely used this speed on PowerBasic for Windows which
is a latter day upgrade of Borland stable, I believe, but very is very
different to GWBasic or QBasic (which is also limited to 9600Bd) and is much
Have a look at Robot Basic http://www.robotbasic.org/
he price is right, it's easy to use, and transportable.
Don
cdel...@juno.com
Hi,
I'm currently using a GWBasic program at 9600 Baud to get 1 second T.I.
data (12 digits) from an SR620 counter, display the reading , put the
reading into a
No idea but no phase modulation is turned on
Paul
On Tue, Oct 9, 2012 at 1:29 PM, JULIAN TOPOLSKI jj...@msn.com wrote:
I have two La Crosse wall-mounted atomic clocks, one is set for local
time (Mountain) and the other to UTC. They both are synchronized to WWVB
and display the same time
On 9 Oct, 2012, at 12:48 , Bob Camp li...@rtty.us wrote:
If you are after sub ns level timing, things are a bit different than if you
are happy with tens of ns error. Few of us have an adequate survey of our
location to *really* worry about sub ns numbers. If you are one of those
lucky few
Boy all I can say is I measured the $7 satellite splitter and it matched
the specs for fwd and rtn loss. Port to port loss using an HP network
analyzer. So what can I say it worked and well. Actually surprisingly so.
Regards
Paul.
On Tue, Oct 9, 2012 at 2:38 PM, Dennis Ferguson
On 10/9/12 9:20 AM, Robert Darlington wrote:
I like the Symmetricom ND-4, however I don't know if you can have it
alternate between TZs. You can buy more than one and label them like
I did.
That's fine.. multiple displays are no problem..
WWV and WWVB are co-located so at first I will doubt of the clocks. Try to
listen to the WWVB too and compare the two very signals.
On Tue, Oct 9, 2012 at 8:22 PM, paul swed paulsw...@gmail.com wrote:
No idea but no phase modulation is turned on
Paul
On Tue, Oct 9, 2012 at 1:29 PM, JULIAN
Hi
In the context of the original post, probably the right question is: do you
have a hydrogen maser and an ensemble of cesiums to compare it to? That's
the environment that gets front and center at these conferences.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
On 10/9/12 10:09 AM, Chris Albertson wrote:
For wall displays, I've noticed more and more people simply mounting a
large HD TVs to the wall and driving it with a computer. Even the
menu board in back of Starbucks and the directory near the elevator
that lists who is in what room on that floor.
On Tue, Oct 9, 2012 at 10:33 AM, Hal Murray hmur...@megapathdsl.net wrote:
Suppose I wanted to do an experiment with GPS receivers: Is setup A better
than setup B? But they share some parts, say the antenna, so I can't run
them both at the same time.
How long do I have to collect data for
I am pretty sure good old Visual Basic Pro version 6.0 (and newer) supports to
115kb.
GW Basic officially makes you a dinosaur...
Didier KO4BB
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: cdel...@juno.com
To: time-nuts@febo.com
Sent: Tue, 09 Oct 2012
I don't know abut Windows but onother OSes I can pipe the serial
port trough some other program, even one as simple as cat and then
you BASIC program can read the data from cat's output and not have to
even know about serial ports. I'm pretty sure this works in Wndows.
BASIC will think it is
Here's a link to a USNO paper that measured the tempco of three GPS
amplifiers: http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA490830
They found that amplifier filtering was the prime cause of tempco, and
the narrowest bandpass amplifier they looked at had a group delay range
of 4 nanoseconds
Dinosaurs ruled the world for millions of years, and morphed into creatures
that ruled the air until very recently .bit longer than dotcomms
...They were very successfull :-))
Alan
G3NYK
- Original Message -
From: shali...@gmail.com
To: Discussion of precise time and frequency
Dear Edgardo,
On 10/09/2012 04:31 AM, Edgardo Molina wrote:
Now to the point if you kindly allow. I got involved in a round table
discussion around the use of GPS antennas for time and frequency GPS
receivers. I tried to make some points from my personal perspective.
I got resistance from the
Looked at powerbasic and yes it supports the higher rates.
Various pricing models up to $200 and $50 for a paperback manual.
It looks pretty interesting.
But at least liberty basic is free up to a level that for most timenuts
would be enough.
I have no favorites actually.
Regards
Paul
On Tue, Oct
Hi
I'm not sure I'd call it Basic, but Microsoft has VB Express (or what ever
they call it this week) for free if you are running Windows.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: Tuesday, October 09, 2012
On 10/09/2012 09:27 PM, John Ackermann N8UR wrote:
Here's a link to a USNO paper that measured the tempco of three GPS
amplifiers: http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA490830
They found that amplifier filtering was the prime cause of tempco, and
the narrowest bandpass amplifier they
On 10/9/2012 11:55 AM, shali...@gmail.com wrote:
I am pretty sure good old Visual Basic Pro version 6.0 (and newer) supports to
115kb.
GW Basic officially makes you a dinosaur...
Didier KO4BB
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From:
This week it may be Visual Studio, avaible from:
http://www.microsoft.com/visualstudio/eng/products/visual-studio-express-products
73 de Thomas
2012/10/9 Bob Camp li...@rtty.us
Hi
I'm not sure I'd call it Basic, but Microsoft has VB Express (or what ever
they call it this week) for free if
Lady Heather supports a digital clock display. You can zoom it to full screen.
It would not be difficult to add the two time zones to that display.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe,
On 10/9/2012 6:04 PM, Mark Sims wrote:
Lady Heather supports a digital clock display. You can zoom it to full screen.
It would not be difficult to add the two time zones to that display.
You could use three of these:
http://www.sparkfun.com/tutorials/47
Hard to tell, but some of those images to me makes it look like the
display is ghosting. You need to add some dead time between strobing digits.
I'm partial to using a MAX7219, but watch out for the serial interface,
since it is somewhat non-standard. I don't recall the details exactly,
but
Hi Corby,
Before you go to all the trouble of venturing into unfamiliar waters, code a
few inps and outs to poke a 2 into the uart divisor latch and give it a try.
I just tried poking 3 to pull in some 38.4k NMEA strings and its fine.
Using v3.22 and W7/32.
Ed
-Original Message-
From:
Dear Friends,
Thank you all for all your replies and points of view regarding this thread. I
was unable to reply to you individually as I got too many answers in a very
short time. StilI had the chance during the day to summarize all your
information and presented what is more than
albertson.ch...@gmail.com said:
The satellites are in 12 hour orbits. Everything repeats every 12 hours.
But the sun is on a 24 hr. period and if you did two 12 hour tests you don't
want to do one at night and one in day. So start each test at the same
time of day let it run for 12+ hours.
xe1...@amsat.org said:
I could upload the pictures I took to an image hosting server, showing a
little bit of Mexico's time scale UTC (CNM) and the current work with Cesium
fountain and frequency comb clocks. My apologies beforehand if my offer
could be a little of topic and probably way off
Dear Hal,
Thank you for your interest!
I was originally planning for sending a URL pointing to a picture slideshow I
will be preparing in one of our company web hosting servers. If it is
interesting for you, I will then start working on it as I get more pictures at
CENAM.
Judah Levine
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