Hal wrote:
What would it cost to replace all of it? If you wanted to do something like
that, what would "it" cover? How about people like us running old recycled
gear? (Z3801A, ThunderBolt, ...)
Not a chance. Probably not consumer navigation receivers,
either. Maybe public safety users.
The so called atomic clocks that used to be locked to WWVB have switched
over to GPs for higher reliability. My WWVB clocks loose lock when ever
there is a lightning storm within 50 miles but the GPS clocks stay locked.
No one is going to get hurt or killed because of a disabled GPS clock but
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 22:01, Hal Murray wrote:
>
> li...@rtty.us said:
>> There's an enormous amount of gear out there that gets timing
Maybe the site has other sensors, like seizmographs or groundwater level
that are not obvious.
-John
>
> 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
>
Some other users of gps timing that I have noted thru observation or have
personal knowledge of:
Timing for telecom providers (I have seen loran used in the past, but this
option is more or less gone in North America now.)
Timing for power companies
Timing for industrial process control
Timin
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 center.
Are there other large categorie
Is it possible/interesting to design an antenna that has a low-angle cutoff
at 20 or 30 degrees? That probably won't eliminate many satellites that are
useful for timing receivers.
I'm interested in things like a Z3801A or a ThunderBolt. I'm assuming it is
not reasonable to replace the GPS u
On 06/10/2011 06:42 PM, Bob Camp wrote:
Hi
The FCC (like most US agencies) has a mission to promote as well as
regulate. The promotion side is what drives them to allocate frequencies in
a way that you can reasonably produce gear. They have always come back years
later and tried to change things
Also given that Galileo is subtantially delayed due to European budget
constraints
http://www.engadget.com/2010/10/07/eus-galileo-satnav-system-orbiting-way-past-budget-delayed-unt/
it does not seem like it can be expected to mitigate the issue for
navigation purpose, aside political implications a
Hi
The FCC (like most US agencies) has a mission to promote as well as
regulate. The promotion side is what drives them to allocate frequencies in
a way that you can reasonably produce gear. They have always come back years
later and tried to change things around. Every time, the same issues get
h
Thanks Jim!
Sorry for posting on time-nuts list with time-offset +1 ;-) corrected.
- Henry
--
ehydra.dyndns.info
Jim Lux schrieb:
On 6/10/11 6:55 AM, ehydra wrote:
Jim Lux schrieb:
The MEO height of GPS was a deliberate choice (again, that GPSWorld
series is a fascinating history of how
You folks are all far more knowledgeable than I on these issues so I have a
question:
To what extent, from both an engineering perspective and from the standpoint
of public policy, should it be the obligation of transmitter and receiver
manufacturers to design and build devices with sufficient fil
The problem is that many FM receivers leak LO signal, so if 2 receivers are
next to each others and set 10.7 MHz apart, one will be receiving the LO of the
oter.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Chuck Forsberg WA7K
On 6/10/11 6:55 AM, ehydra wrote:
Jim Lux schrieb:
The MEO height of GPS was a deliberate choice (again, that GPSWorld
series is a fascinating history of how it came about). Don't forget
that one of the original reasons for GPS was for doing midcourse
correction on ICBMs.
Where is this GPSWorl
Jim Lux schrieb:
The MEO height of GPS was a deliberate choice (again, that GPSWorld
series is a fascinating history of how it came about). Don't forget
that one of the original reasons for GPS was for doing midcourse
correction on ICBMs.
Where is this GPSWorld history located?
regard -
He
On 6/9/11 10:36 PM, Henry Hallam wrote:
On Thu, Jun 9, 2011 at 2:42 PM, Jim Lux wrote:
GPS orbits are tough from a radiation standpoint too.
In particular, the orbits are considerably worse for radiation than
GEO, and photovoltaic panels are quite susceptible to radiation. Of
course you co
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