ST 500 "Piranha" Operation Manual: Use Guidelines
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Signs of "THREAT" signal:
at the frequency of the detected signal, the test sound is heard through the headphones,
the test sound is not heard in the headphones, but the oscilloscope picture of the
demodulated signal changes with the test sound,
the detected signal is marked red in the table, which means that a mobile digital device is
nearby, or the signal is within the band utilized by radio-transmitting eavesdropping
devices,
there is a radical decrease in the level of the detected signal when ST 500 is brought
outside the checked room.
8.
Analyze all the other signals in a similar way.
9.1.2. SEARCH IN THE "PANORAMA" MODE AND DIFFERENTIAL MODE
The "PANORAMA" and DIFFERENTIAL mode are used to search for eavesdropping devices
under heavy radio traffic conditions on site.
1.
Turn on the test sound source and adjust the sound volume in the checked room.
2.
Outside the checked room:
connect the antenna and headphones to the main unit of ST 500 and turn it on
put on the headphones
3.
Turn on SELECTIVE HF DETECTOR channel ("PANORAMA" Mode).
4.
Depending on the activity in the frequency range, set the optimal gain, making sure that
no off-scale occurs.
5.
Activate the DIFFERENTIAL mode, obtaining a differential view.
6.
Enter the room while monitoring the differential view; note any new signals that may
appear, or increasing levels of the ones already detected.
7.
If new signals have appeared, select the table row with the strongest one.
8.
Activate "FIXED FREQUENCY ANALYSIS" function.
9.
Analyze the detected signal as follows:
listen to the signal in headphones at different passband (1 or 20 MHz) and using different
demodulators (AM / FM)
analyze the signal with the oscilloscope
if needed, use frequency fine tuning
Signs of "THREAT" signal:
at the frequency of the detected signal, the test sound is heard through the headphones
the test sound is not heard in the headphones, but the oscilloscope picture of the
demodulated signal changes with the test sound
there is a radical decrease in the level of the detected signal when ST 500 is brought
outside the room.
10.
Analyze all the other signals in a similar way.
