On Sat, Sep 1, 2018 at 3:49 AM, Dana Whitlow wrote:
>
> Question for Mark re metal foil under the antenna:
>
> What's the nature of the improvement? Between the large tilt angle and
the
> shape of the
> foil piece, I'd certainly not expect any material improvement in the
> multi-path department.
On Fri, Aug 31, 2018 at 12:41 PM, Gerhard Hoffmann wrote:
>
>
>> So you can test your hold over behavior with aluminum foil (or your hand)
>> over your antenna
>>
>> OMG, I first read "with aluminium foil hat over your head"
>
Now, foil under the antenna on the other hand, big improvement!
Hi
Time is not (ultimately) determined by an atomic clock. It’s determined by
astronomical observations
that evaluate the rotation of the planet. Those observations are what drive
things like leap seconds.
In the event that a flare takes out 99% of all life on earth and every
electrical
That’s the scenario i’m most concerned with not war or terrorism but a natural
event which has occurred before and will occur again.
Rebooting technology will be a heck of a lot easier with a variety of precision
time/frequency distribution methods.
After a Carrington type event a working Cs
I'm thinking about if/when "the big one hits" and takes out most or all of
the GPS
sats, cell phone systems, etc.
Then the time required to reboot up to a reasonable level of technology
might turn
out to be limited by our ability to determine time and freq somewhat
accurately. The
better we can
Hi
I think we have a little bit of confusion here. WWVB is not going to help
anybody navigate.
It’s not going to help track people with ankle bracelets or trucks stopping at
bars. Car thieves
jamming Lojack still happens. Turn iWWVB on or off, this stuff still goes on.
None of this is
a
Am 31.08.2018 um 19:39 schrieb jimlux:
On 8/31/18 10:15 AM, Bob kb8tq wrote:
Hi
Having spent a lot of my life designing GPSDO’s it’s a “that depends”
sort of thing.
For a simple noise jammer, yes, they pretty much all will go into
holdover. When the
jammer goes away, they come out of
Hi
Most of them are doing CW signal detection and notch filtering. There are a
number
of ways for “birdies” to show up in any environment, jamming or no jamming.
Some of
the details of who’s doing what and how well are under NDA. None of it is 100%
effective, it’s just a way to get another 10,
On 8/31/18 10:15 AM, Bob kb8tq wrote:
Hi
Having spent a lot of my life designing GPSDO’s it’s a “that depends” sort of
thing.
For a simple noise jammer, yes, they pretty much all will go into holdover.
When the
jammer goes away, they come out of holdover. There are a few older units that
may
Several GPS receivers have a setting for enabling jamming detection and/or
mitigation. The datasheets don't tend to talk about what it does. But, if
the receiver supports it (Trimble and Venus devices), Lady Heather can
configure it.
___
time-nuts
Hi
Having spent a lot of my life designing GPSDO’s it’s a “that depends” sort of
thing.
For a simple noise jammer, yes, they pretty much all will go into holdover.
When the
jammer goes away, they come out of holdover. There are a few older units that
may not
do quite as well with various
Hi:
I'm curious if anyone knows how typical GPSDO's are likely to respond to simple
GPS jammers ? Could the GPSDO be reasonably expected to go into hold over ?
The use case I am thinking is along the lines of:
-A commercial operation relies on a GPSDO for timing at a remote site.
-A
12 matches
Mail list logo
