Audio Analysis Of Modulation; Use Of Signal Outputs; Further Analysis - Gigahertz Solutions HFW59D Manual

In February 2002 the Medical Authority of the Federal State of Salz-
burg, Austria, recommends to reduce its "Salzburger Precautionary
Recommendation" from 1,000 µW/m² to 1 µW/m² inside buildings and
10 µW/m² outside. These limits are based on empirical evidence over
the past few years.
In summary it confirms the justification of precautionary limits
well below the present legal limits.

Audio Analysis of Modulation

The audio analysis of the modulated portion of the HF signal helps to
identify the source of a given HF radiation signal. There is a selection
of audio samples on our homepage (high frequency meters).
How to proceed:
For audio analysis, simply turn the volume knob of the speaker at the
top of the case all the way to the left ("-"). If you are switching to audio
analysis while high field strength levels prevail, high volumes can be
generated quite suddenly. This is especially true for measurements
which are to be taken without audio analysis. The knob is not fastened
with glue to prevent over winding. However, if by accident you should
turn the knob too far, simply turn it back again. No damage will be
caused.
The volume can be controlled with the "audio" knob. Note: The power
consumption of the speaker is directly proportional to the volume.

Use of Signal Outputs

AC output:
The AC output "PC/head-set", a 3.5 mm jack socket, is meant for an
in-depth analysis of the AM/pulsed content of the signal, for instance
by headset.
DC output
(2.5 mm jack socket):
For a (longterm) recording of the display value. When "Full Scale" is
displayed, it has 1 VDC output. Our data loggers NFA1000 and
NFA30M are perfectly suitable for this purpose.

Further Analysis /

Optional Accessories:
Available from Gigahertz Solutions:
 HF-Analysers for frequencies below 2.4 GHz
 Meters for the low frequencies: There are two series available to
meet all requirements and cover all frequencies, the NFA series,
and the M/E series.
 Data loggers: The exceptionally high recording rate of 10/s of the
NFA line is very informative, especially regarding the volatile HF
pollution.
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