Re: Congratulations!


Brian A wrote:
On 9 Jul 2006 04:04:32 -0700, pauljohnsonmurray@xxxxxxxxxxx wrote:
Microwaves, which is what mobile telephones rely on (and no, it's NOT
radiowaves, it's microwaves!)

Paul, you are obviously not an Engineer. Do you not realise that
microwaves are radio waves? Microwave is only a classification. The
higher UHF TV frequencies are bordering on 'microwaves' and have been
in use for television, in this country since the 1960s with much
higher powers than are used for mobile phone transmitters. TV
transmitters, such as Emley Moor in Yorkshire, cover whole counties,
and more. Satellite communication uses microwaves. That has been in
use around the world for many years - we rely on the technology for
long distance telephone calls as well as television.
The frequencies used for mobile phones are not all that much higher
than those used for television.

You have to be most careful what you read. People who are ill informed
will write allsorts of rubbish and raise anxieties. I read allsorts of
technical things on the Net, and even in books, where the person who
has written it clearly does not understood what (s)he is writing
about. In the same way some people write about health issues when
they are not qualified to do so. This only raises confusion and
misunderstanding.

There is little to add to this excellent explanation, except maybe to
point out how the ambiguity of the word may have misled people - why a
microwave oven is so called

In a microwave oven, radio waves at frequencies around 2.45 GHz are
absorbed by and heat up water and other substances (specifically the
hydroxyl bond). As food is mostly water, this is an excellent way to
cook. But an oven is about a thousand times more powerful than a phone,
though of course it is screened. But also, the frequencies in mobile
phone use do not have the same heating effect as the specifically
chosen range for the oven.

On another thread not far away someone said that you can cook an egg
between 2 phones; a spoof of course but some people are gullible. It is
clearly absolute nonsense, as the amount of stored energy in the phone
battery would run a kettle for less than 5 seconds, even if completely
turned to heat.

As Brian says, it may eventually be shown that intensive use of a phone
close to the head is not wise, but there is little evidence of harm.

Radio signals become weaker further from their source, on the square of
the distance, so average passive levels for non-phone users are
thousands of times lower, and the cumulative heating effect on the body
is totally negligable next to its own heat from burning food or being
in the sun. And they have no ionising effect like radioactivity.

Perhaps some of these remarks will reassure Paul's fears. On the other
hand, if all he wants is an excuse to hurl abuse at people then
perhaps the discussion has almost reached an end.

.

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