Hello Time Nuts,
I thought this would be of interest to the group:
http://www.ft.com/cms/s/0/fadf1714-940d-11e3-bf0c-00144feab7de.html
Regards,
John W.
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Perhaps my browser is too conservative but it looks like you have to be a
subscriber to read the Financial Times article.
Here's one about eLoran vs. GPS jammers which has some security
implications.
http://nakedsecurity.sophos.com/2014/02/13/revamping-an-old-technology-to-jam-the-gps-jammers/
You should not denigrate PhotoMultiplier tubes.
They are virtually perfect, almost noiseless, detectors. With the right
photocathode, they are capable of QEs 50%, spectral response from the VUV
to near IR, and dark counts 1 PPS, with maximum count rates 10 MPPS.
Thay can easily have current gains
On Fri, Feb 14, 2014 at 8:14 AM, Paul tic-...@bodosom.net wrote:
Perhaps my browser is too conservative but it looks like you have to be a
subscriber to read the Financial Times article.
Here's one about eLoran vs. GPS jammers which has some security
implications.
I was reading the [time-nuts] Now For Something Completely Different...GPS
Security thread and came across the nobody is in charge refrain re: security.
That is not the only place. It is also true for the smart grid. I wrote this a
few months ago so it is still fresh:
There was a lot of work done on GEN III NV devices. They use GaAs
photocathodes w/ high QE. The same photocathode works for PMTs.
Detecting single photons is duck soup w/ a PMT. With modest cooling, you
can get the dark count down to 1/minute or better.
-John
=
On Fri, Feb
On Fri, Feb 14, 2014 at 7:45 AM, J. Forster j...@quikus.com wrote:
You should not denigrate PhotoMultiplier tubes.
They are virtually perfect, almost noiseless, detectors. With the right
photocathode, they are capable of QEs 50%, spectral response from the VUV
to near IR, and dark counts 1
Consider this thread done.
Please, everyone, stay on topic. Don't post non-technical newspaper articles.
Don't reply to off-topic postings. Keep the chatter down. Keep the quality up.
This is not twitter or reddit.
Thanks,
/tvb
www.leapsecond.com/time-nuts.htm
