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ers, etc.) Once this is completed, the remaining radiation will orig-
inate from outside. For remedial shielding it is important to identify
those areas of all walls (including doors, windows and window
frames!), of ceiling and floor, which are penetrated by the radia-
tion. To do this one should not stand in the centre of the room,
measuring in all directions from there, but monitor the permeable
areas with the antenna (LogPer) directed and positioned close to
the wall/ceiling/floor
. The reason for this is that the antenna lobe
4
widens with increasing frequency. In addition reflections and can-
cellations 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. An-
yway, 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
analysis of the modulated portion of the HF signal helps to identi-
fy 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
frequency range of the HFW35C will only be found regionally. At
present, the components for the upper WLAN band (from 5 to 6
4
Please note: In this position the readings on the LCD only indicate relative highs
and lows that cannot be interpreted in absolute terms.
© Gigahertz Solutions GmbH
Made in Germany
no!
potentiell
durchlässiger
Bereich
antenna
13
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