Gigahertz Solutions HFW59D Instruction Manual page 13

the audio analysis, these signals can easily be distinguished from
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the radar signals .
Information on radar measurements:
For air and sea navigation, a radar antenna slowly rotates around
its own axis, thereby emitting a tightly bundled "radar ray". Even
with sufficient signal strength, this ray can only be detected every
couple of seconds, for a few milliseconds. This requires special
measurement technology.
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 seconds, in the case of reflections maybe also at shorter inter-
vals):
Switch meter settings to "VBW Maximum" and "Peak hold" and
take several measurements of the radar signal from varying
measurement points in order to be able to identify the main direc-
tion of emission and to record the quantitatively correct meas-
urement value.
If the location of the radar base is not known, the quasi isotropic
UBB antenna is particularly useful for the determination of the
maximum exposure values.
Quantitative Measurement:
Determination of Total Exposure
Hold the HF analyser from its rear side with a slightly out-
stretched arm.
In the area of a local maximum, the positioning of the HF analys-
er should be changed until the highest power density (the most
important measurement value) can be located. This can be
achieved as follows:
 By scanning "all directions" with the LogPer to locate the di-
rection 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
radiation.
 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 measure-
ments of all three axes and calculating the result. Most manufac-
turers of professional testing equipment, however, do not share
this view.
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Users of HF59B please note the different recommendations regarding the VBW settings
© Gigahertz Solutions GmbH
Made in Germany
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