ST181 provides analysis of 2G, 3G and 4G networks of all mobile operators under the control of the software “ST181 Analyzer”
The result of the work is a list of detected base station cells Clicking on the column name provides sorting by this feature.
Detection of false base stations is provided by the selected criteria.
Monitoring of base stations ST181_1
Monitoring of base stations ST181_2 Monitoring of base stations ST181_3
Using ST181 together with ST154 or ST167 solves the following problems:
Automatic installation of cellular communication ranges at the place of use Constant “background” monitoring allows you to quickly detect the emergence of new frequency ranges and adapt ST154 and ST167 to the changed radio environment The operating algorithm consists of analyzing base stations, after which an information window will appear.
Next, you can go to the list of base stations or press the button to configure the products for existing cellular ranges.
For continuous monitoring of base stations, you need to use the "Scan in background" option.
monitoring of base stations ST181_4
Technical specifications Frequency range B8 (2G 900), B3 (2G 1800), B2, B8 (3G 900), B1, B3 (4G1800), B7, B8 (4G 900), B20 (800) USB interface Dimensions without antenna, mm 83X52x15 Package contents:
Main unit Antenna Charger USB cable Flash drive Warranty card
Good to know:
Search methods - based on the restructuring of the receiver in a given frequency band. With a significant exploration time, it is possible to detect and measure the carrier frequency with high accuracy. The frequency range is scanned, as a rule, periodically according to a sawtooth law with a tuning period of {\displaystyle {T}_{p}}{T}_{{p}}.
Depending on the ratio of the tuning period and the duration of the signal {\displaystyle {T}_{s}}{T}_{{s}}, which must be detected, three search methods are distinguished:
slow search, fast search, search at medium speed. With a slow search, the receiver's tuning time by the width of its bandwidth is greater than the signal repetition period. Slow search is well suited for detecting constantly operating electronic equipment. At the same time, the accuracy of frequency determination is very high. Serious disadvantages of slow search are the long signal detection time and the low probability of reconnaissance of short-term electronic equipment. To overcome this drawback, it is necessary to increase the width of the receiver's bandwidth, which leads to a decrease in sensitivity.
With a fast search, the receiver tuning time in the entire range is very small, and the tuning speeds are very high (hundreds and thousands of megahertz per microsecond). With this search method, the probability of detecting short-term operating electronic equipment during one receiver tuning period is high, but the resolution and frequency determination accuracy are lower compared to a slow search, which is due to the inertia of the receiver's resonant circuits.
When searching at an average speed (probability search), the detection of short-term signals is not guaranteed during one tuning period, while the other parameters are good enough for radio monitoring purposes.
Search-free methods are based on the simultaneous reception of signals in a wide range of operating frequencies without tuning heterodynes or filters. The frequency reconnaissance time of operating electronic equipment can be very small, since all spectrum components are detected simultaneously and almost instantly. Types of non-searching methods:
interference methods, use of single-channel receivers, use of multi-channel receivers. The interference method is based on the known dependence of the phase shift on the path length and frequency. The signal from the antenna output is branched into two feeder lines of different lengths. After passing these lines, a temporary shift of the signals occurs. The received signals are normalized by level and subtracted. The advantage of the interference method is the simplicity of the equipment implementation, the disadvantage is a decrease in accuracy with the expansion of the reconnaissance range and low sensitivity.
Single-channel receivers are broadband: their bandwidth is equal to the range of frequencies being reconnoitred. The simplest broadband direct amplification receiver consists of an antenna, a demodulator, a video amplifier and an indicator. The accuracy of frequency determination and sensitivity are low. Single-channel receivers are used only to establish the fact of irradiation.
Multi-channel receivers provide high accuracy of frequency determination. This is due to the fact that the operating frequency range is divided by a filter system into a number of sub-ranges. The transparency bands of the filters are adjacent to each other. Multi-channel receivers are used for rough determination of the frequency and type of radio electronic equipment. The number of channels in them reaches several dozen.
Direction finders are devices for determining the direction to the radiation source I. Direction finders are divided into search ones, in which the direction to the radiation source is determined by successive scanning of the studied space (for example, by turning a highly directional antenna) and non-search ones, which determine the direction to the radiation source almost instantly. High accuracy of direction finding is achieved by using a large number of antennas. Direction finders are used in radio navigation. Search by direction can be fast and slow.