Gigahertz Solutions HF35C Bedienungsanleitung Seite 14

Made in Germany
In fall 2008 the "Bund für Umwelt und Naturschutz Deutschland
e.V." (BUND) (environmental NGO) recommended a limiting value
of 1 μW/m² even for outdoor situations.
The Landessanitätsdirektion Salzburg (Austrian health authority)
proposed already in 2002 to lower the present "Salzburger
Vorsorgewert" (precautionary value) to 1 μW/m² for indoor situ-
ations.
Limiting values imposed by governments are mostly considerably
higher. There are indications of rethinking, though. The internet
provides large collections of recommendations and data.
Note for users of cellular phones and WLAN: Even below the
measurement range of the meters, even the highly sensitive
HF35C, a reliable communication is absolutely possible.
Identification of the sources of pollution
After determination of the total exposure the next step is to find
out where the radiation enters the examined room. As a first step
eliminate sources from within the same room (e.g. cordless
phones, wireless routers, etc.) Once this is completed, the remain-
ing radiation will originate from outside. For remedial shielding it is
important to identify those areas of all walls (including doors, win-
dows and window frames!), of ceiling and floor, which are pene-
trated by the radiation. 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 widens with increasing frequency. In addi-
tion 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
Audio Frequency Analysis (HF35C only)
Many different frequencies within the frequency band between
800 MHz and 2.7 GHz, are being used by many different services.
The audio analysis
helps to identify the source of a given HF radiation signal.
Sounds and signals are very difficult to describe in writing. The
easiest way to identify them is to listen to the sound samples of
the different signal sources, which can be found as MP3 files on
6
Turn the volume control for the audio analysis fully to the left („-„) before
switching the meter on, as the sound might be very loud at high field strengths.
12
6
of the modulated portion of the HF signal
© Baubiologie Maes / IBN
no!
antenna
© Gigahertz Solutions GmbH
potentiell
durchlässiger
Bereich