Gigahertz Solutions HF59B Bedienungsanleitung Seite 26

M a d e in G e r m a n y
The upper edge of the foremost resonator is a good "aiming aid" for the
required angle. It does not matter if the angle gets a little too wide.
Our logarithmic periodic antenna, the "LogPer antenna", provides a dis-
tinct division of the horizontal and vertical polarization plane. Also, the
frequency response is exceptional. There is a patent pending for its
design.
(For professionals: For the technically rather difficult measurement of the vertical po-
larization, it is significantly better shielded against the falsifying ground influences).
The missing directionality of standard telescope antennae is one of the
reasons why they are not suited for reliable HF measurements in build-
ing biology EMR.
The readings from the instrument's display always reflect the integral
power density at the measurement location coming from the direction
the antenna is pointing at.
As the HF59B picks up frequencies below 700 MHz, it has no inte-
grated high pass filter. However, the filter HP700 is available for exter-
nal connection if needed, and is to be placed between the antenna en-
try and the antenna cable.
In addition, the HF59B is able to capture numerous sources of radiation
in the lower HF band which are not pulsed (i.e. amplitude modulated).
By their nature these non-pulsed sources are not available for audio
analysis. That means you can get a significant reading on the instru-
ment without hearing any audio signal, which makes the interpretation
of the readings more difficult. To avoid this source of misinterpretation
the instrument marks those "inaudible" signals by a rattling tone, the
loudness of which is in proportion to its share in the total signal. The
frequency of this marking is very low (16 Hertz). An example of it can
be found on our homepage. With the switch to the right of the display
in the "Pulse" position, these sources of radiation as well as the corre-
sponding rattling "marking" are blanked out.
For a quantitative measurement of frequencies below 700 MHz with
the HF59B, Gigahertz Solutions provides the active, horizontally iso-
tropic ultra-broadband antenna UBB27_G3 responding to frequencies
from 27 MHz right up to more than 3.3 GHz.
LogPer or Omni-Antenna?
Depending on the task, either of the antennas have advantages as
well as disadvantages:
• For frequencies below 700 MHz the UBB27 antenna is the only op-
tion, as for geometrical reasons the LogPer antenna only starts at
700 MHz.
• For long term data logging in most cases the isotropic observations
make most sense: Again UBB27.
• For a quick survey of the total immission (that is: Total exposure to
radiation) the UBB also has clear advantages.
• For the determination of appropriate shielding measures, i.e. the lo-
cation and identification of the source of pollution, the LogPer tech-
nology is definitely superior to the isotropic measurement.
Seite 24 © Gigahertz Solutions GmbH