Appears to be opportunity for a disciplined brain in the future.
http://www.sciencedaily.com/releases/2012/10/121030210339.htm
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John,
thanks for your email, I am replying to Time Nuts as well as there is a lot
of knowledgeable folks here that can help.
In terms of a GPSDO tutorial, take a look at the HP papers linked on the
JLT website under the Links Of Interest and Related Whitepaper sections:
Thank you very much for the thorough reply.
Best Regards,
John
From: saidj...@aol.com [mailto:saidj...@aol.com]
Sent: Wednesday, October 31, 2012 3:17 PM
To: John Lofgren; time-nuts@febo.com
Subject: Re: GPS receiver testing
John,
thanks for your email, I am replying to Time Nuts as well as
If one were to rearrange the input circuit a little bit, and give
it some new firmware, this looks very close to platform for time
measurement...
http://www.seeedstudio.com/blog/2012/10/10/preorder-now-pocket-size-antenna-analyzer-sark-110/
Ohh, and the HAMs would probably find it useful as it
Looks nice. Shame it doesn't go up to 500 MHz or more, though. If it
did, I'd probably buy one at that price. I already have an MFJ 259B
that only goes up to 170 MHz.
Joe Gray
W5JG
On Wed, Oct 31, 2012 at 2:44 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
If one were to rearrange the input
John,
I would advice you to look at what Spirent and Pendulum can offer you
with regards to GPS simulators. The Pendulum GPS simulation should be of
interest as it is a fairly decent cost, where as the Spirent equipment
is really really good. One way to characterize PPS properties is to do
Magnus,
Most GPS simulators only have an OCXO in them which are not very good for
making precision timing measurements. The simulator needs to have a
rubidium in it or have an external input for a more precision frequency
source.
Regards,Doug
Connected by DROID on Verizon Wireless
When I had (for a very limited time) the SMBV100A from RS loaded with the
GPS simulator, I connected it to the 10MHz and PPS output of my GPSDO.
Unfortunately there was not time enough to take measures... anyway the PPS
output of the GPS under test aligned with the incoming PPS.
On Thu, Nov 1,
On 11/01/2012 01:31 AM, k4...@aol.com wrote:
Magnus,
Most GPS simulators only have an OCXO in them which are not very good
for making precision timing measurements. The simulator needs to have a
rubidium in it or have an external input for a more precision frequency
source.
Not really, the GPS
Measuring 1PPS stability requires a counter and a reference. As Said mentioned,
the counter requirement is fairly simple: any sub-nanosecond counter like a
53132A is fine (higher resolution is wasted anyway). But the reference
requirement is the more difficult. If you want to measure down to
Preorder? ...for the sark was a boojum, you see ...
Don
Poul-Henning Kamp
If one were to rearrange the input circuit a little bit, and give
it some new firmware, this looks very close to platform for time
measurement...
Hello Said,
I'm familiar with your postings on the Time Nuts list, so I thought I'd
ask your advice. I searched the Time Nuts archive, but didn't come up with
what I was looking for (reference to a good GPS tutotial).
We have a GPS project in-house that requires us to characterize
On 10/31/12 6:17 PM, Tom Van Baak wrote:
Please read John Plumb's paper:
http://tycho.usno.navy.mil/ptti/ptti2002/paper29.pdf
and Rick Hambly's paper:
http://tycho.usno.navy.mil/ptti/ptti2002/paper9.pdf
At JPL, most of the calibration and performance testing and such is done
using an
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