On Sep 4, 2007, at 7:50 AM, Claes Mogren wrote:
I call bullshit on this signal restriction. How come they've
successfully had wifi on planes without any problems?
Have you tried all WiFi devices on all planes?
And I know that people have their phones on all the time while
flying and I've never heard that it has caused a crash or even been
noticed in any way. Can't imagine that there's any GSM signal to
pick up a 30000ft anyway when you move at 800km/h.
Note that you're typically not moving at 800km/h relative to all
towers. In fact, if you can see a tower (LOS), then its likely not
in front of, or behind the plane, so the
relative velocity could be quite low.
Also, if GPS is bad for the planes, how come the US is going to use
it to navigate the planes?
(http://www.theregister.co.uk/2007/09/04/
gps_satnav_air_traffic_for_america/ )
What if your GPS interferes with their GPS, because it happens to
have a broken ground on the shield on its oscillator?
(see previous message).
Anyway, back to OpenMoko. I agree that it's good to have the option
to turn all wireless communication off on boot, with a timeout of
10 seconds or so. Default should be the same settings as you had
when you turned off though.
Regards,
Claes Mogren
On 9/4/07, Richi Plana <[EMAIL PROTECTED]> wrote:
On Tue, 2007-09-04 at 10:27 -0700, John Seghers wrote:
> Part of the process of receiving signals involves heterodyning--
basically
> mixing a received signal with lower intermediate frequencies
(IFs) to
> amplify the desired actual signal, while making the carrier
signal something
> easier to work with. See http://en.wikipedia.org/wiki/Heterodyne
for a very
> basic description.
Fascinating. So "passive receivers" really aren't? Or are there
classes
of receivers which are (no amplification or very sensitive pickups)?
Prolly off-topic, but I sure am curious. Are there no radar detectors
which don't give off their presence?
--
Richi Plana
