Camera Looks Like a Phone

[Prometheus]

Archived from groups: rec.photo.digital (More info?)

In article <hn8ir09qgpkpjpqbjo59iieuu0jnurgd7u@4ax.com>, Big Bill
<bill@pipping.com> writes
>On Fri, 10 Dec 2004 00:00:06 +0000, Prometheus <Prometheus@127.0.0.1>
>wrote:
-----Cut, about using a Faraday cage to block signals
>>
>>Until the emergency services need to operate inside the building, i.e.
>>monitoring fire officers & giving them instructions, advice and
>>facilities requests from paramedics & signals from bio-monitoring
>>medical equipment used by paramedics, etc. Of course you might not be
>>able to require buildings that are poor in this respect are adapted, but
>>you can object to a building being modified in a way that prevents
>>emergency communications. Don't forget that emergency communications
>>will include pager and mobile phones used for staff on call-out.
>
>I think you'll find that emergency comm units are significantly more
>powerful than cell phones.
>What will block cell phone signals won't block the emergency comm
>units.

True a Faraday cage is best viewed as an increased path loss, I have
worked with cages that prevent communication between two 2W handsets
either side of the window; a theatre system could have holes in the
screen so as to pass some signal, although mobile phones handsets are
not a lot less powerful than handheld transceivers (i.e. viz. 1W vs.
5W), if a building is in a strong signal region for mobile phones then
the screening required could prevent emergency comms which could be with
a weaker more distant base.
--
Ian G8ILZ

 

[Prometheus]

Archived from groups: rec.photo.digital (More info?)

In article <v38ir0152dshr6st3t84ihqn7pk56cn7p5@4ax.com>, Big Bill
<bill@pipping.com> writes
-cut------
>Because the jammer has no right to disable someone's phone for the
>convenience of others.

Added to which for the jammer to be effective throughout the building it
will also jam signals outside; put simply, it will not stop at the
window.

--
Ian G8ILZ