ST 500 "Piranha" Operation Manual: Use Guidelines
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9. USE GUIDELINES
9.1. GUIDELINES FOR USE OF "SELECTIVE HF DETECTOR" CHANNEL
The "SELECTIVE HF DETECTOR" channel is intended for detection, identification and
localization of radio transmitting, "active" eavesdropping devices in the range of 20 - 6000 MHz.
Three option of searching for eavesdropping devices:
AUTOMATED mode
manual modes ("PANORAMA" or DIFFERENTIAL mode)
search in previously known frequency ranges (in the "WIRELESS COMMUNICATION" mode).
Three stages in the search for eavesdropping devices:
stage #1 - detection of the signal
stage #2 - identification of the detected signal ("threat"/"non-threat")
stage #3 - localization of the source of a dangerous signal
The presented search algorithms are typical and can be adjusted depending on the features of
the object being checked and the tasks set.
9.1.1. SEARCH IN THE AUTOMATED MODE
The AUTOMATED mode is used at small loading of a frequency range in the area of search
SEARCH ALGORITHM:
1.
In the checked room:
activate the test sound source and adjust the sound volume
connect the antenna and headphones to the main unit of ST 500
turn on ST 500
2.
Turn on "SELECTIVE HF DETECTOR".
3.
Depending on the activity in the frequency range, set the optimal gain, making sure that
no off-scale occurs.
4.
Turn on the AUTOMATED mode.
5.
Sort the table by signal level in ascending order.
6.
Select the first table row as current.
7.
Analyze the demodulated signal as follows:
listen to the signal in headphones at different passband (1 and 20 MHz) and using
different demodulators (AM / FM)
analyze the signal with the oscilloscope
fine tune the frequency if necessary
