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Fluctuations with regard to space and time
Reflexions can cause highly localised amplifications or cancellations
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 consid-
erably varying power during a given day and in the long term, de-
pending on local reception and load. Therefore repeat measure-
ments at different times of the day on working days and at week-
ends. In addition it may be advisable to repeat them occasionally
over the year, as the situation can change over night. As an exam-
ple, a transmitter only needs to be tilted down by a few degrees in
order to cause major changes in exposure levels (e.g. during instal-
lation or repair of cellular phone base stations). Most of all it is the
enormous speed with which the cellular phone network 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 To-
tal Exposure
When testing for HF exposure levels in an apartment, home or
property, it is always recommended to record individual measure-
ments 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:
For horizontal orientation of the antenna you should rotate the in-
strument rather than twisting the cable. The LED at the front of the
antenna indicates a good connection, which is essential for an ac-
10
Do not twist the antenna cable
or bend it sharply!
© Gigahertz Solutions GmbH
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