Gigahertz Solutions HF59B Bedienungsanleitung Seite 35

for several circles of the radar ray, move the instrument left and right
in order to identify the main direction of the source and get the rele-
vant quantitative measurement value.
If the location of the radar station is unknown, it is particularly con-
venient to use the isotropic UBB27 antenna. However the trade-off is
no information of the direction. The long delays between pulses may
consume a great deal of time trying to detect signal direction with a
LogPer aerial.
Please note that there are radar systems which operate at frequen-
cies between 8.5 and 9.5 GHz (naval, aviation, traffic and weather
radar), and which can be measured with our HFW59D.
Smart Meters
The frequencies / radio services implied are those of common wire-
less communication standards. The challenge when measuring
smart meters emissions lies in their duty cycles. They transmit data
in very short, irregular, and unpredictable, but intensive bursts that
happen only about every 1 to 10 or even more minutes.
To measure these bursts use the standard setting (Peak hold/VBW
standard), keep the meter in the same location and monitor it until a
burst occurs.
The HF59B has a patented circuitry that allows for the exact meas-
urement of the extra fast rise times of the bursts even in the "+"-set-
ting for Peak hold.
Identify where the radiation enters a structure
As a first step eliminate sources from within the same room (e.g.
cordless phones, wireless routers, etc.). Once this is completed, the
remaining radiation will originate from outside. For remedial shielding
it is important to identify those parts of the walls (including doors,
windows and window frames!), 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
creasing frequency. In addition, reflections and cancellations inside
rooms make it difficult and often impossible to accurately locate the
"leaks". Please see the illustrating sketch below!
wall
right!
potentially HF-permeable
part of the wall
antenna
The uncertainty of localization with HF-antennas
The shielding itself should be defined and surveyed by a specialist,
and in any case the area covered by it should be much larger than
the leak.
16
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
16
. That is because the antenna lobe widens with in-
wrong!
antenna
wall
potentiell
durchlässiger
Bereich
Made in Germany
Seite 33