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Fluctuations with regard to space and time
Reflexions can cause highly localised amplifications or cancella-
tions of the high frequency radiation, in particular inside buildings.
This is why one should stick to the step-by-step procedure in the
next chapter.
In addition, most transmitters and cellular phones emit with con-
siderably varying power during a given day and in the long term,
depending on local reception and load. Therefore repeat meas-
urements at different times of the day on working days and at
weekends. In addition it may be advisable to repeat them occa-
sionally over the year, as the situation can change over night. As
an example, a transmitter only needs to be tilted down by a few
degrees in order to cause major changes in exposure levels (e.g.
during installation or repair of cellular phone base stations). Most
of all it is the enormous speed with which the cellular phone net-
work expands every day that causes changes in the exposure
levels.
The nature of HF radiation requires a specific approach for each
-
the determination of the total exposure to it and
-
the identification of the sources or leaks for the pollution.
Step-by-Step Procedure to Measure the
Total Exposure
When testing for HF exposure levels in an apartment, home or
property, it is always recommended to record individual meas-
urements on a data sheet. Later this will allow you to get a better
idea of the complete situation.
Connecting the Antenna
Screw the angle SMA-connector of the antenna connection into
the uppermost right socket of the HF analyzer. It is sufficient to
tighten the connection with the tightening aid. Do not use a
wrench or other tools because over tightening may damage the
threads.
The radiation in the frequency rang of this instrument are normally
vertically polarized. An orientation of the antenna suitable for this
is as shown in the following picture:
Do not twist the antenna cable
For horizontal orientation of the antenna you should rotate the
10
or bend it sharply!
© Gigahertz Solutions GmbH
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