15.2 GSM and UMTS cellular phones
So-called “cellphones” are getting more and more popular
and already surpassed the number of conventional telepho-
ne network subscribers in 2005. With cellphones, radio trans-
mission is
digital
and mostly “
pulsed”
. UMTS, however, is
“not pulsed”. The transmitting frequencies are, depending on
the network, between 876MHz and 2,2GHz.
See extensive
tables on pages 64-65.
You should observe that cellphones steadily
increase
or
decrease
their transmitting power depending on reception
quality. This means: The further away you are from the next
celltower when placing calls,
the higher the exposure to
radiation from the cellphone.
If you place calls with a cellphone from your car, you will receive a yet signifi-
cantly higher exposure to radiation as the “metal cage” of your car restricts
reception quality (it will mostly switch to
full power
) and additionally, the radia-
tion is being
reflected in large amounts
.
To avoid exposure to this strong radiation, you should definitely use an external
antenna for your car. Exposure then becomes minimal and reception quality will
also be significantly better.
Likewise, your cellphone will also transmit with
full power
inside buildings due
to their strong absorption characteristics.
When you are not placing a call, your cellphone also stops radiating. Like-
wise, when you stop talking during a call, the cellphone strongly turns
down the transmitter-power.
When the cellphone is turned on, it will just sig-
nal its presence to the network once every 1 to 6 hours, using a short transmis-
sion impulse. Otherwise, it is completely “dead”.
In contrast, if you move around with a cellphone, it will (depending on movement
speed and network availability) repeatedly emit short pulses to login or logout to
the respective cell towers.
Attention:
Recently, so-called “positivising” tachyon stickers, positivising chips,
crystals etc. are offered particularly for cellphones. These products are, as you
can see for yourself with SPECTRAN, total nonsense and complete ripoffs. They
have no effect whatsoever.
15.0 RF exposure in practice
52
Summary of Contents for SPECTRAN HF-2025
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