ST 500 "Piranha" Operation Manual: Selective HF Detector Channel
17
In fig.12:
1 - active detection channel
2 - signal level at the selected frequency (at cursor position)
3 - "SET "0"
active
4 - selected passband (1 MHz or 20 MHz)
5 - OSCILLOSCOPE
active
Functionality:
tuning to the frequency of the detected signal
passband selection (1 MHz or 20 MHz);
listening to a demodulated signal
analyzing the signal with oscilloscope
locating the signal source with power method
Controls:
Key
Action
MODE
switching to the main menu of device
ENTER, ESC
turning off "FIXED FREQUENCY ANALYSIS " function
screen cursor positioning
F1
turning on/off "SET "0" function
F2
passband
selection (1 MHz or 20 MHz)
F3
turning on OSCILLOSCOPE
F4
turning on/off gain setting
FUNC
disabled
To turn off "FIXED-FREQUENCY MONITORING" function, press "ENTER" or "ESC". The device
will switch back to the mode, from which the function was activated ("PANORAMA" or
DIFFERENTIAL mode).
3.2.2. "SET "0" FUNCTION
This function helps locate the source of a detected signal. It can be especially helpful in finding
the sources of powerful signals that make the screen levels go off-scale even at minimum gain.
Ways of locating eavesdropping devices are described in more detail in
When "SET "0" is used, the signal level at current frequency is set as "0", and only the level
differences are displayed.
To turn on the "SET "0", press "F1". The "F1" key field will become lighter.
When using the "SET "0" function, it is possible to:
change the passband ("F2")
turn on the oscilloscope ("F3")
change the gain ("F4")
To turn off the "SET "0", press "F1" again. The "F1" field will become darker.