I can confirm there are at least two common varieties of the XL-DC GPS
RX board.
One uses a normal GPS antenna (no down-converter, provides DC on the
antenna line for an amp in the antenna, the typical antenna provided
seems to be an AeroAntenna AT575 variety, but I suspect other antennas
This seems to impact some, but not all, XL-DC units.
At least one of mine was impacted, some of the others were not. I think
it depends on firmware version.
If you check and set the f68 Set Year option this will probably let
you get things back to displaying the correct date.
At least it
CDMA requires accurate time information in the air interface as part of
the low level protocol.
From the standards documents I have read, and the BTS devices I
personally have had exposure to, this always comes from GPS.
The air interface for CDMA also includes a local time offset that is
I've used a number of different time signal
receiver devices as accurate clock sources for
NTP running on Mac systems over the last few
years. I have been doing this sort of thing from
Mac OS X 10.3 onwards, though I have not tried
using a clock receiver on the Mac OS 10.7
machines yet.
While I do sometimes wear a wristwatch, I find I
normally don't. I usually use a stand alone
clock of some sort, or the time display on my
phone.
As for Time Nut relevance, it's still true that
you can get much better accuracy and precision
for a given cost in a clock that most people
I've actually had reason to reference this IBM resource myself recently.
Unfortunately they don't have much in the way of detail on the Type 37 Master.
I just acquired on of these Type 37 masters and I am looking for
technical information on it.
I've found ONE reference on the NAWCC forums
/01, Pete Lancashire wrote:
I would give a try at contacting IBM's Archivist. Who ever wrote the
Clock page
came across as very dedicated to his or her job.
-pete
On Fri, Jul 1, 2011 at 12:45 PM, Russell Rezaian
rreza...@motorola.com wrote:
I've actually had reason to reference this IBM
There appears to be a lot of news coverage about this.
There was this article in the Register earlier today.
http://www.theregister.co.uk/2011/06/21/lightsquared_gps/
All sorts of interesting information. The suggestion is that
LiughtSquared will move to a lot of the Inmarsat spectrum, and
And like the biological mushrooms they resemble, have a tendency to multiply.
At least for Time Nuts...
--
Russell
At 6:30 PM -0400 2011/06/12, William H. Fite wrote:
And an old, weathered bullet might resemble a morel.
___
time-nuts mailing list
Hi Pete,
I have a few of these boxes with various different firmware versions.
Some of the older boxes do have known issues with GPS week rollover
and I have seen things labeled on these boxes as Y2K fixes too.
For your particular box there is one setting I think MIGHT make a
difference for
IRIG is sometimes provided as a digital code at something useful for
directly driving logic (I've seen this intended to drive TTL), and as
the same digital code amplitude modulating an audio frequency carrier.
The modulated audio is the kind of IRIG that is usually decoded by
the sound card
, 2011 at 12:42 PM, Russell Rezaian
rreza...@motorola.com wrote:
This may sound a bit basic, so apologies if you have already passed this
particular hurdle, but there are several different types of IRIG time code.
A number of the clocks I have which generate IRIG can generate different
This may sound a bit basic, so apologies if you have already passed
this particular hurdle, but there are several different types of IRIG
time code. A number of the clocks I have which generate IRIG can
generate different versions of IRIG (e.g. IRIG B, IRIG H)
If memory serves, the NTP code
Paul,
I have a 2201 (and a 2200) and some documentation for the 2201A
including something labeled as a maintenance manual for the 2201A.
I took a very quick pass through this looking for references to
internal 1 PPS, but did not see anything too obviously relevant.
Perhaps we can discus
Hi Jason,
Not sure if you have checked this, but I have found that I can see
100us or more of delta if the dedicated clock has not done a position
average run, or has bad position information set.
So if you trust your 4501s to be providing the better time, you might
want to look for other
At 10:38 PM -0400 2010/05/18, Stan, W1LE wrote:
A quick review of the manual shows a GPS antenna downconverter,
external device.
So, it may take more than a GPS antenna/RF preamplifier, like I use
with my Trimble.
Hopefully you will get the down converter also.
Not all GPS NTS-100 units
Bruce,
The NTS-100 is almost identical to the 100i, save for the fact that i
doesn't have the network management module (serial management only)
and DOES produce time code on the serial port.
There was a link for the 100i manual on the Symmetricom web site when
last I checked, and I found a
Hi Bruce,
I believe the NIC-215 is the IRIG model. The 315 is the native GPS
unit. The ones I have seen are all the 3xx series and GPS based.
Since you have the 100i you may be able to just go to the Symmetricom
web site to download a copy of the manual. They still had it listed
when
Most common screen resolutions for me:
4x3 aspect ratio:
1280x1024
1600x1200
16x10 aspect ratio
1920x1200
2560x1600
The 1920x1200 is a 16x10 ration, which seems to be more common that
then TV 16x9 ratio that gives you 1920x1080. I remeber one person
posting that his computer was TV 16x9
Hello all,
I have just obtained an Austron 2201 GPS time and frequency receiver
and I was hoping I might appeal to the good people here for pointers
to manuals for the box.
Downloadable is preferred, but I would happily pay to have one copied.
Thank you!
--
Russell
Thanks! I would like to buy it from you.
I have tried to send you a more detailed email off list.
--
Russell
At 4:48 PM -0500 2009/10/14, frle...@verizon.net wrote:
I have a 2201 sitting in my lab with antenna and manuals that I would
like to sell for $300.
Francesco Ledda
Hi Mike,
I have been thinking about this particular idea for a few months now.
I've read a number of references that mentioned that at one point in
the past TrueTime made a GPS antenna that would drive the 468 clocks
with a signal that resembled the signal that came from the GOES
At 12:58 PM -0700 2009/05/19, Hal Murray wrote:
USB has a bad reputation, but I think it's way way overblown. Yes, it's
polled, but that polling is done in hardware and the time scale is 1 ms. If
you are satisfied with an accuracy of a few 10s of ms, USB works fine. The
problem is the GPS
I don't have a Kindle, but I do have both the Sony Reader (501) and
the iRex iLiad.
Here are a few comments based on my experience.
I don't think the Kindle is officially sold in Europe yet. Both the
Sony and the iRex readers are available in Europe. May not mean much
for you, but might
Hi Hal,
I can't offer much in the way of recommendations for GPS receivers,
but I have been doing some experimentation just lately with USB
serial devices for serial time code to NTP.
I'd be very interested in comparing results!
So far I've been using reasonably decent GPS clocks and a USB
Sorry to jump in, but does anyone have any thoughts on whether this
might also be involved in the odd year rollover issue seen on many
TrueTime devices?
This is the issue where the work around for the TrueTime clocks is to
use the F68 command to set the year explicitly to 1996.
From what I
Hi all,
I have found myself with a GPS clock that is labeled as requiring a
GPS down converter antenna. It won't sync to any of my normal
antennas. Looks like it has an up-converter integrated into the
receiver directly.
So far so good. I think I may have found an antenna with a built in
HI Brooke,
Thanks for the information and references!
The GPS I have is sending 12 VDC up the antenna cable, which matches
what I'd expect to power the down-converter in the antenna assembly.
Lucky for me it seems the correct antenna/down-converter modules seem
to be available. I have one on
Thanks Björn!
Yes, 10 MHz is a nice convenient choice :) for a reference signal.
I think I am going to hold off on trying my
Quartzlock down-converter until I can find a data
sheet. It's looking like there's enough
variables between different manufacturers
practices that there's a good
Hi Bill,
I was wondering if that might have been you.
Please let me know how things go with your restoration effort, I'm
very interested!
At 11:06 AM -0500 2009/03/12, Bill Hawkins wrote:
Bought the Hahl clock on eBay (thanks, Russell). The bellows has
deteriorated, but I have some experience
Hi Bill,
Fascinating subject here, thank you for the summaries of your research!
You can sometimes find the slave clocks for the US pneumatic systems.
There's one on eBay now. Made by Hahl, not sure what shape its in,
but the pictures don't look bad.
I'm not sure what kind of pressure you'd
Also it seems that there was at least one company making pneumatic
master/slave clock systems for buildings. I've found references to
these made by the Hahl company out of Chicago.
Not sure if any of these are still in service anywhere.
I know pneumatic building automation systems are still
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