Re: Digital Photography On Aircraft Not Permitted on Take Off or Landing

In message <150120081025537502%nospam@xxxxxxxxxxxxxx>, nospam
<nospam@xxxxxxxxxxxxxx> writes
[Clip references to 1990s tests]

and those studies were done with old analog cellphones which transmit a
lot more power than modern digital cellphones.

Quite true, but in the 1990s a wide-body jet might have a dozen
passengers with mobiles on board. Nowadays there could be as many as
three or four hundred digital mobile phones on board. If they were all
active at the same time, trying to connect to cells as phones do when in
standby then that could mean as much as 200W or more of broad-spectrum
RF bouncing around the cabin since the phones transmit at full power
while attempting to connect with the ground-based cells several
kilometres below them.

The new microcell system being tested for aircraft cabins means that
even if there are 400 mobile phones on board they will all be operating
at very low power levels, connecting to the cell antennas scattered
throughout the cabin only a few metres away. This is what will make
cabin mobile-phone operation safe.
--
To reply, my gmail address is nojay1 Robert Sneddon
.

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