Delta X 100/12 User Manual
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Contents
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Delta X. User Manual50Please note that this setting is valid in the Signal Analyzer mode only, while the other modes fetch tracesin accordance with their own algorithms.The "Frequency" shows the tuned frequency. The marker on the Spectrogram will be positionedcorrespondingly. There are 3 ways to change the tuned frequency: Double-clicking or clicking the signal in the Signals table A click on the Spectrogram Editing the value directly using the Frequency controlDemodulationWhen the watch mode is set to "Demodulate" the Delta X produces demodulated sound on thecurrently tuned frequency.The toolbar in the Demodulate mode:There are 5 demodulation modes: FM (frequency modulation), AM (amplitude modulation), USB (uppersideband modulation), LSB (lower sideband modulation) and CW (continuous wave modulation).Please note that in our modern environment there are a huge number of digital signals which cannot belistened to with the help of the analogue demodulator. Mobile communications, wireless devices andencrypted VHF/UHF communication cannot be demodulated. Despite this the Delta X warns theoperator about the existence of such signals, by detecting their spectrum. The subsequent locatingprocedure makes it possible to pinpoint the transmitter in the premises not depending on the ability todemodulate.Analogue bugging transmitters typically use the FM modulation, although some devices sending audiothrough wires can use the AM or other modes. Radio broadcasting uses both the FM and AM, dependingon the band. TV signals can be sent in the FM or AM, depending on the country.The demodulation bandwidth (BW) can be selected in order to achieve the best quality of reception. Forexample 240000 Hz is suitable for the demodulation of some analogue bugging devices, FM stations andaudio channels of TV stations. 15000 Hz is suitable for the reception of some analogue bugging devicesand VHF/UHF communications.It is recommended to apply different demodulations and BWs when inspecting any unknown signals.To tune in a signal double-click or click it in the Signals table. By default the signal's central frequency istuned in. Since the carrier of some signals is not positioned in the center (for example TV/video signals),it is recommended to change the tuned frequency within the edges of signal's spectrum in order tostudy the unknown signal and find possible signs of modulation and audio.Please note the absence of audio is not a sign of a signal's safety. The more important indication is theabsence of a high danger level in different parts of premises. Therefore it is recommended to move theDelta X system or its antenna in order to inspect and locate any suspicious signals. |
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