Frequency

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M. Anas - 24 Jun 2004 06:26 GMT

Hi,

From what I am read now on an internet site, I understand that radio waves
moving through the atmosphere behave quite differently at different
frequency. This is due to the effect of the sun on the atmosphere, and it
changes from day to night, as well as from year to year. Is this also true
for Cellular phones? if they why never notice any difference?

Anas

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VK3XEM - 24 Jun 2004 06:56 GMT

> Hi,
>
[quoted text clipped - 5 lines]
>
> Anas

The frequencies used by cell phones are not noticeably affected by
weather, sun, atmosphere or time of day. Also the fact that the design
of cellular networks operating in relatively short areas to effectively
re-use the frequencies in near by areas also means there will be little
or no affect.

73 de Simon, VK3XEM.

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John S. - 24 Jun 2004 17:51 GMT

>I understand that radio waves
>moving through the atmosphere behave quite differently at different
>frequency. This is due to the effect of the sun on the atmosphere, and it
>changes from day to night, as well as from year to year.

Over time the atmosphere will cause RF to behave differently. Depending on the
Frequency, the variations differ.

When you are using a cellular system, you expect that the cellular RF engineer
has designed the system with these variations (which can be predicted to a
certain extent) are taken into account and designed to minimize the impact on
the user.

>if they why never notice any difference?

I am guessing at your sentence here but my above paragraph pretty well tells
all.

--
John S.
e-mail responses to - john at kiana dot net

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Stanley Reynolds - 25 Jun 2004 19:23 GMT

>>I understand that radio waves
>>moving through the atmosphere behave quite differently at different
>>frequency. This is due to the effect of the sun on the atmosphere, and
>>it changes from day to night, as well as from year to year.

You may notice a difference between winter and summer due to an increase of
leaves on the trees also if the leaves are wet or dry. The largest effect
in marginal locations is multipath interference, moving the phone a few
inches can change the signal several db. If you are in motion this sounds
like talking through a fan, the person you are calling will most likley say
you are "breaking" up. Shielding the internal antenna with your hand or
head will also cause the phone to work better while dialing but to lose
signal once you place it next to your ear.

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