You can prototype a system with off the shelf parts get a few
computers, old notebook computers, Raspburry "pI' or repurposed
routers, what ever you have. Connect a Trimble Thunderbolt GPS to
each one. Each one runs NTP. Connect them all to a isolated network.
It could be wired, WiFi or whateve
On 7/23/13 9:15 AM, Chris Albertson wrote:
I don't think those requirements are hard. You can build a system
that works in three cases
1) GPS is available full time
2) GPS is available intermittently.
3) there is not GPS system, world war III has destroyed it.
or you're in an urban canyon
or
Starting a new thread...
Brian wrote:
Have you considered WWVB? Works fine within structures.
Even though the carrier today is phase modulated one can probably glean
1 ms accuracy from it or the data transmitted.
-- disasters occur world wide, any time day or night, so depending on
WWVB won'
Have you considered WWVB? Works fine within structures.
Even though the carrier today is phase modulated one can probably glean
1 ms accuracy from it or the data transmitted.
Regards
Brian
On 7/23/2013 14:05, Magnus Danielson wrote:
On 23/07/13 05:55, Jim Lux wrote:
On 7/21/13 6:42 PM, Chri
SG8002 is definitely a distributor programmable unit.
It is a digital synthesizer in a can with no effort towards clean output.
PLL? They would not bother to put a cleanup PLL in the can for the
intended microprocessor application.
Tim N3QE
On 7/21/13, Didier Juges wrote:
> I am familiar with
In message <51ee68ce.6090...@nc.rr.com>, Brian Alsop writes:
>Good, bad or meaningless?
On grounds of principle I will say "probably meaningless" until I
see you reproduce the same number with the counter running on the
internal OCXO.
That said, I've done the same thing, and found numbers of the
I acquired an HP-8657B refurbished by a well regarded individual.
Beautiful printout of unit's performance versus the test matrix.
One thing I was interested in is how well it "locks" to an external
source. The previous generator I had produced 5 -10 ns random jumps
observable on a 'scope. I
Charles
sorry for the delayed answer, see below for why.
I did my own thing for the outer oven controller.
Mark C. S. was kind enough to redraw the schematic of what I made and post
it on his site.
http://www.vk2hmc.net/blog/?p=526
Do you know that often *your* postings do not show up on the
For the AD9850 (as well as the higher-tech more-bit-resolution modules)
there are programming words/freqs that are awful with a lot of close-in
spurs, and others that are comparatively clean (well, maybe just as many
spurs by some measure but they are far far away).
If you go to a DDS with higher
On 7/22/13 6:30 AM, Tom Van Baak wrote:
For what it's worth, the application is a radar that detects
buried victims in disaster rubble, so the data we are collecting is
basically heartbeats and breathing. the "when was the data taken"
is a "where were we when the data was collected" need. The "
> For what it's worth, the application is a radar that detects buried
> victims in disaster rubble, so the data we are collecting is basically
> heartbeats and breathing. the "when was the data taken" is a "where
> were we when the data was collected" need. The "sync" requirement comes
> from
On 22/07/13 04:42, Didier Juges wrote:
I am familiar with the Epson Seiko SG8002 series and nowhere does it say they
are programmable. They are not user programmable for sure, only the distributor
has the tools to do it. The data sheet does not have any information that would
be a hint that th
I am familiar with the Epson Seiko SG8002 series and nowhere does it say they
are programmable. They are not user programmable for sure, only the distributor
has the tools to do it. The data sheet does not have any information that would
be a hint that they are PLL's.
Http://WWW.KO4BB.com/Timin
Hi Hui
Yes I had the some trouble. I also thought that PicoSync II software
would work with the older PicoSync but no succes.
I think it might be difficult to get software for the older PicoSync
since it seem to be a OEM model with customised software. However I have
been able to get in contac
This brings up an interesting point. There is an azimuth and a weighted
azimuthal display. The azimuthal display comes out essentially
omnidirectional. The weighted display produces a heart shaped pattern
with the heart lobes to the NE/SW and a pretty deep null due north.
What weighting is
Bob Camp bought up an interesting point,
using a PAD will cut the voltage going up the spout to the antenna amplifier.
I am using a distribution amp that separately powers the GPS antenna so did not
take this into consideration.
If you try the PAD, measure the voltage output of the pad to make
Hi Russ
AMU is a Trimble invented quality unit. I once heard a professor describe
it as "A Meaningless Unit".
The Tbolt can change between AMU and dBc. With your range, the Tbolt has
been switched to dBC, it is not showing AMUs.
Approaching 50 with your high elevation SVs is excellent. You have
Can popped open pretty easily. Now to start to measure voltages to see if
things are within tolerance.
On Sat, Jul 20, 2013 at 5:22 PM, paul swed wrote:
> Hello to the group.
> As the various posts mention pulling the outer oven and taped wire off is
> a job. But thats done.
> The Osc is 45 Hz
I don't think those requirements are hard. You can build a system
that works in three cases
1) GPS is available full time
2) GPS is available intermittently.
3) there is not GPS system, world war III has destroyed it.
I think what you want is a system that is failure tolerant and can
make use of
Hi Jim,
On 23/07/13 16:55, Jim Lux wrote:
Starting a new thread...
Good idea!
Brian wrote:
Have you considered WWVB? Works fine within structures.
Even though the carrier today is phase modulated one can probably glean
1 ms accuracy from it or the data transmitted.
-- disasters occur world
The standard deviation using the 5335 internal oscillator is 0.39 nS.
Regards
Brian
On 7/23/2013 11:32, Poul-Henning Kamp wrote:
In message <51ee68ce.6090...@nc.rr.com>, Brian Alsop writes:
Good, bad or meaningless?
On grounds of principle I will say "probably meaningless" until I
see you r
On 23/07/13 05:55, Jim Lux wrote:
On 7/21/13 6:42 PM, Chris Albertson wrote:
I think the way to keep the sensors in sync is to use the same method
they use to keep cell towers in sync. Basically each tower has a GPS
receiver and also a good local oscillator. The GPS disciplines the
oscillator an
On 7/23/13 4:51 AM, Scott McGrath wrote:
Thanks Jim
Was not aware that <10 Ghz signals could penetrate so deeply. I work for a
enterprise wifi company on the RF side and one of our key challenges is signal
attenuation/distortion by building materials
Any pointers to papers on this?
there's
Thanks Jim
Was not aware that <10 Ghz signals could penetrate so deeply. I work for a
enterprise wifi company on the RF side and one of our key challenges is signal
attenuation/distortion by building materials
Any pointers to papers on this?
I did know that /tvb was using seismic sensors but
24 matches
Mail list logo
