Gigahertz Solutions HFW35C Bedienungsanleitung Seite 15

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ing and floor, which are penetrated by the radiation. To do this one
should not stand in the centre of the room, measuring in all direc-
tions from there, but monitor the permeable areas with the antenna
(LogPer) directed and positioned close to the wall/ceiling/floor
reason for this is that the antenna lobe widens with increasing fre-
quency. In addition reflections and cancellations inside rooms make
it impossible to locate the "leaks" accurately. See the illustrating
sketch below!
Wand
Wall
Mur
Pared
Potentiell durchlässiger Bereich
Potentially permeable Area
antenna
For the definition and installation of shielding measures as well as
surveying their effect, professional advice is recommendable. Any-
way, the area covered by shielding material should be much larger
than the leak itself.
Audio Frequency Analysis
Many different frequencies within the frequency band between 2. to
6.0 GHz, are being used by many different services. The audio anal-
ysis of the modulated portion of the HF signal helps to identify the
source of a given HF radiation signal.
Sounds and signals are very difficult to describe in writing. The best
way to learn the signals is to approach known HF sources very
closely and listen to their specific signal patterns.
On our home page you will find a link to some typical samples of
audio analyses as MP3-files. Furthermore, the audio analysis can be
significantly simplified by the filters we offer.
Permanently low display values?
Fortunately, exposures in the frequency range of the HFW35C are
not yet widespread. Therefore, we have often been asked whether
the device does in fact work, as it rarely ever shows any values. In
the following please find answers to frequently asked questions:
"The HFW35C only indicates very low measuring values"
Answer:
Naturally, the radar and directional radio frequencies within the fre-
quency range of the HFW35C will only be found regionally. At pre-
sent, the components for the upper WLAN band (from 5 to 6 GHz)
are still difficult to obtain, so you will only encounter selective expo-
sures in this frequency range. The WiMAX network (from 3 to 5 GHz)
is only active in some testing locations, its extension all over the
4
Please note: In this position the readings on the LCD only indicate relative highs
and lows that cannot be interpreted in absolute terms.
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