Gigahertz Solutions HFE35C Bedienungsanleitung Seite 16

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Audio Frequency Analysis
Many different frequencies within the frequency band between
27 MHz and 2.7 GHz, are being used by many different services.
The audio analysis
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. Without detailed
knowledge, the characteristic signal patterns of the following HF
sources can be easily identified: 2.4 GHz telephones (DECT
phones, incl. base station and handset) as well as cellular phones,
the signal patterns of which can be divided into "a live connected
phone call", "stand-by mode" and, especially important for cellular
phones, the "establishing of a connection". The typical signal pat-
terns of a cellular phone base station can also be identified this
way. For comparison reasons you are well advised to take meas-
urements during high-traffic times, as well as some times during the
night, in order to familiarize yourself with the different noises.
"Marking" of unpulsed signals:
Un-pulsed signals by their very nature are not audible in the audio
analysis and therefore easily missed. For that reason they are
marked by a uniform "rattling" tone, with its volume proportional to
its contents of the total signal. Within the frequency range covered
only by the UBB antenna unpulsed signals are quite common.
On our home page you will find a link to some typical samples of
audio analyses as MP3-files as well as the marking signal. Further-
more, the audio analysis can be significantly simplified by the filters
we offer.
For more in-depth analyses
Gigahertz Solutions offers:
Attenuator and amplifiers for expanding the designed range of
the analysers up- and downwards for extra strong and extra weak
sources of pollution.
Frequency filters for a more precise separation of different radio
frequency service bands.
Instruments for HF up to 6 GHz / 10 GHz: For analyses for yet
higher frequencies (up to abt. 6 GHz, including WLAN, WIMAX
and some directional radio sources and aviation radar), we offer
the HFW35C (2.4-6 GHz). A new broad band analyser for 2.4-10
GHz is under development (HFW59B).
Instruments for low frequencies: Electrosmog is not limited to
the Radio Frequency range! Also for the low frequency range
such as power (distribution and domestic installations) and rail-
ways including their higher harmonics we offer a broad range of
affordably priced instruments with high professional standards.
Please refer to our homepage for comprehensive coverage.
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Turn the attenuator knob for the audio analysis fully to the left („-„) before begin-
ning, as it might become very loud, when switching while monitoring a high intensi-
ty radiation.
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of the modulated portion of the HF signal helps
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