I have recently done some side-by-side testing of a new PCTel antenna vs an
older Trimble bullet antenna to see if there was any degradation of GPS
operation. The PCTel had 26 dB gain and a sharp bandpass filter incorporated
that was 60 dB down at the the lower edge of the GPS band (upper edge of
On 6/7/2011 10:40 PM, cook michael wrote:
Le 07/06/2011 21:15, r...@lcs.mit.edu a écrit :
I have an HP 58503A. It has an Option H14,H19 sticker on the back. The
circuit board has 58503-60001 Rev C stamped on it. It has been running
continuously and locked to GPS for a few days, and it knows
GPS time differs from UTC by the number of leap seconds accumulated since
the start of GPS time. Reseting the GPS clocks each time a leap second
occurs would upset the code generators. The satellites stay in GPS time but
do transmit the difference between UTC and GPS time to allow receivers to
On 06/11/2011 02:11 PM, Ron Hahn (EI2JP) wrote:
On 6/7/2011 10:40 PM, cook michael wrote:
Le 07/06/2011 21:15, r...@lcs.mit.edu a écrit :
I have an HP 58503A. It has an Option H14,H19 sticker on the back. The
circuit board has 58503-60001 Rev C stamped on it. It has been running
continuously
Hi
Best guess - a few million timing receivers are out there. Probably not over
ten million. To replace them at new prices, figure $5000 each including
the labor. Lots of variables, might be twenty billion dollars if you did a
straight swap.
Changing out antennas would be cheaper for the
On 6/10/11 7:01 PM, Hal Murray wrote:
li...@rtty.us said:
There's an enormous amount of gear out there that gets timing off of GPS.
That's an interesting claim. Does anybody have any data on the usage of GPS
for timing?
I assume there is one in every cell tower and one in every 911 call
On 6/11/2011 2:47 PM, Magnus Danielson wrote:
On 06/11/2011 02:11 PM, Ron Hahn (EI2JP) wrote:
On 6/7/2011 10:40 PM, cook michael wrote:
Le 07/06/2011 21:15, r...@lcs.mit.edu a écrit :
I have an HP 58503A. It has an Option H14,H19 sticker on the
back. The
circuit board has 58503-60001 Rev C
Ron,
Magnus,
I am interested in UTC time for weather satellite reception,
synchronising via NTP. I tried the GPSCON program for the Z3801A but
could never get it to broadcast ntp information on my LAN. Recently, I
have purchased some Sure GPS boards from Sure Electronics
bob-
you coming to greylock?
-Brian, WA1ZMS
On Jun 11, 2011, at 12:13 AM, bownes bow...@gmail.com wrote:
That small hemispherical antenna could also have been 900mhz. I have
one here @ home that is a combined gps/900mhz antenna from an
ambulance tracking system.
On Jun 10, 2011, at
Magnus,
I am interested in UTC time for weather satellite reception,
synchronising via NTP. I tried the GPSCON program for the Z3801A but
could never get it to broadcast ntp information on my LAN. Recently, I
have purchased some Sure GPS boards from Sure Electronics
Since people are showing off their clocks... I managed to get a Datum / Bancomm
bc632D display from eBay a while back and it's
pretty cool.
From what I can tell, they took an off-the-shelf model from Beta Brite (Now I
think owned by Adaptive) and put an extra board in
there with the BNC
I have been wondering about this.
Since leap seconds accumulate from time to time, there must be a
'difference' between GPS and UTC. Is the difference related to the rotation
of the earth around it's axis and around the sun and thus the need to add a
second or so from time to time as we do with
The former.
John WA4WDL
--
From: J. L. Trantham jlt...@att.net
Sent: Saturday, June 11, 2011 4:16 PM
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Subject: Re: [time-nuts] HP Z3801A, GPS vs UTC?
I have been
It's not up to time-nuts standard, but here is my gps clock I built some years ago. It
uses a Motorola Oncore board for the gps and I didn't bother with trying to compensate for
the delay my software causes. I did put in a routine to allow for daylight saving (curious
concept- a bit like
Aarghh- it's too early in the morning for thinking- here is the url!!
http://www.vk7krj.com/ham_stuff.html
On 2011-06-12 06:55, Ken , VK7KRJ wrote:
It's not up to time-nuts standard, but here is my gps clock I built some years
ago. It
uses a Motorola Oncore board for the gps and I didn't
TRY http://www.vk7krj.com/ham_stuff.htm
Neville
On 12/06/2011, at 6:58 AM, Ken , VK7KRJ wrote:
Aarghh- it's too early in the morning for thinking- here is the url!!
http://www.vk7krj.com/ham_stuff.html
On 2011-06-12 06:55, Ken , VK7KRJ wrote:
It's not up to time-nuts standard, but here is
I bougth an Thunderbolt off E-bay some time ago, to use as reference
for my spectrum analyzer and signal generators.
I had it connected up with a couple of power supplies and it worked as
it should.
Today I put together an voltage inverter to get the -12V to the GPS in
order to use it with an
Hello Thomas,
The first question is did you measure the minus 12 output of your inverter to
make sure it was not being loaded down too far when powering the Thunderbolt ?
If it was working on the original minus 12 volt supply properly, then it would
seem that there is a problem with your
Any enterprise large enough to have an IT deparment needs
precise timing. The cheapest stratum one source is GPS.
I work at a Research II university and have several in our network.
The time is the public key for our routers that send encrypted
routing table updates to each other.
There are
I remember a professor at the University of Wisconsin Madison
who postulated the advancement of Man could be measured by
man's advancing technology of measuring time. We have come
a long way to get down to nanoseconds, LigutSquared notwithstanding.
I suppose the next advance will be to some
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