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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.
Minimum distance 2 meters
Due to the physics of wave generation it is not possible to reliably
measure the customary "power density" (W/m²) in the close vicini-
ty of the source of radiation. For the instruments described here,
the distance should be in excess of 2 meters, for frequencies be-
low 100 MHz 20m.
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.
Preliminary Notes Concerning the Antennae
For the evaluation of the total pollution the UBB-Antenna should
be used, as it it has an "omnidirectional" reception pattern.
For the identification of the sources or leaks for the pollution the
LogPer-Antenne ("Christmas-tree") is more suitable (for frequen-
cies above 800 MHz only, that is mobile phones, WLAN etc.).
The antenna dampens frequencies below 800 MHz in order to
avoid the readings being disturbed by lower frequency sources.
The UBB27 can also pick up frequencies below 800 MHz..
Settings of the Analyser
At first set "Range" to "1999 µW/m²". Only if there are constantly
very small readings, switch to the next finer range. The basic rule
is: as coarse as necessary, as fine as possible. In the rare case
of power densities beyond the designed range of the analyser ("1"
displayed on the left hand side even in the coarsest range) they
can still be measured by inserting the attenuator DG20, available
as an optional accessory. When using this attenuator, multiply the
displayed value by 100 to calculate the actual measurement.
Setting Signal Evaluation ("Signal"): The peak HF radiation val-
ue, not the average value, is regarded as the measurement of
critical "biological effects" affecting the organism and to be com-
pared to recommended safety limits.
The average value ("RMS") of pulsed signals is often only a very
small fraction of the peak value. Nontheless it forms the basis of
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