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27
To be on the safe side, we recommend the following procedure for
the acoustic identification of a radar signal (a short “beep” which
will recur every few seconds, in extreme cases only every 12 sec-
onds, in the case of reflections maybe also at shorter intervals):
Switch meter settings to “VBW Maximum” and “Peak hold” and
take several measurements of the radar signal from varying meas-
urement points in order to be able to identify the main direction of
emission and to record the quantitatively correct measurement val-
ue.
If the location of the radar base is not known, the quasi isotropic
UBB antenna is particularly useful for the determination of the max-
imum exposure values.
Quantitative Measurement:
Determination of Total Exposure
Hold the HF analyser from its rear side with a
slightly outstretched
arm
.
In the area of a
local maximum,
the positioning of the HF analyser
should be changed until the highest power density (the most im-
portant measurement value) can be located. This can be achieved
as follows:
By
scanning
“all directions” with the LogPer to locate the direc-
tion from which the major HF emission(s) originate. In apartment
houses also scan from top to bottom.
By
rotating
the HF analyser around its longitudinal axis up to
90°, thus taking into account the polarization plane of the HF ra-
diation.
By
changing
the measurement position
and avoid measuring
exclusively in one spot, in order to avoid measuring exclusively at
a point of local or antenna-specific cancellation effects.
Some manufacturers of field meters propagate the idea that the
effective power density should be obtained by taking measurements
of all three axes and calculating the result. Most manufacturers of
professional testing equipment, however, do not share this view.
In general, it is well accepted that exposure limit comparisons
should be based on the maximum value emitted from the direc-
tion of the strongest radiation source.
To be on the safe side with exposure limit comparisons, it might be
useful to multiply the displayed value by a factor of 2, and take the
result as a basis for your comparison. This method is often applied
by building biologists in order to avoid to be assuming a far lower
exposure than realistically existent should the meter be measuring
in the lower tolerance field, taking into account, however, that this
