Gigahertz Solutions HF59B Bedienungsanleitung Seite 33

M a d e in G e r m a n y
up to a value of 1.00 or more on the display 15 . In order to reach lower
levels you can use the preamplifier HV10.
For obvious reasons the use of a correction factor only makes sense
for readings above the noise level!
Radar
For air and sea navigation, a radar antenna slowly rotates around its
own axis, thereby emitting a tightly bundled "radar ray". Even with suf-
ficient signal strength, this ray can only be detected every couple of
seconds, for a few milliseconds. This requires special measurement
technology.
For an acoustic identification of a radar signal (a short "beep" which in
extreme cases is only repeated approx. every 12 seconds), please
proceed as follows:
Select setting "VBW Maximum". Set signal switch to "Peak hold" and
direct the LogPer antenna towards the signal emitting source. Wait 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 relevant
quantitative measurement value.
If the location of the radar station is unknown, it is particularly conven-
ient to use the isotropic UBB27 antenna. However, the trade-off is no
information of the direction. The long delays between pulses may con-
sume a great deal of time trying to detect signal direction with a LogPer
aerial.
Please note that there are radar systems which operate at frequencies
between 8.5 and 9.5 GHz (naval, aviation, traffic and weather radar),
which can be measured with our HFW59D.
Smart Meters
The frequencies / radio services implied are those of common wireless
communication standards. The challenge when measuring smart me-
ters 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 measure-
ment of the extra fast rise times of the bursts even in the "+"-setting for
Peak hold.
Identify where the radiation enters a structure
As a first step eliminate sources from within the same room (e.g. cord-
less phones, wireless routers, etc.). Once this is completed, the re-
maining radiation will originate from outside. For remedial shielding it
15 Inherent to the system: The higher the video bandwidth, the higher the displayed
noise level.
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