ST 158 CELLULAR COMMUNICATION BLOCKERS PERFORMANCE CONTROL SYSTEM

ST 158 is designed to monitor the operability of CDMA450, GSM, 3G, 4G cellular communication blockers (jammers) based on monitoring the required excess of the blocker signal level over base station signals.

Prerequisites for using the complex

When installing a blocker, as a rule, insufficient attention is paid to checking the suppression zone and the compliance of the blocker frequency range with the cellular frequencies at the place of use. This is done mainly based on checking the presence of communication with the base station of a cellular phone of one or two operators. However, it is necessary to check all cellular operators - there can be more than five.
Over time, the cellular operator can change the location, the number of base stations, which leads to a change in the signal level at the place of installation of the blocker and, accordingly, the suppression zone or the appearance of a radio exchange zone outside the frequency range of the blocker.
The blocker is a complex radio transmitting device and can simply break down during operation. It can be difficult to promptly detect the fact of shutdown or complete / partial failure. GENERAL PROVISIONS
The CDMA 450, GSM, 3G, 4G standards have frequency-separated transmission and reception paths. A cellular jammer creates interference in the frequency range of the receiving part of a mobile device (handsets, GSM beacons, etc.), i.e. in the frequency range of base stations. To reliably suppress communication between a base station and a mobile device, the jammer signal level must exceed the level of the received signal of the base station by a certain value (suppression coefficient).

Thus, to assess the efficiency of a cellular jammer, it is necessary to measure the signal level of the base stations of all operators in the controlled area and the jammer signal level in the entire frequency range (standard) of the jammed cellular communication.

DESCRIPTION OF THE KM
The KM includes:

a radio receiving unit of the range of cellular communication standards
a transceiver that provides communication with the control post via WLAN or ETHERNET networks (in the options for transmitting data to a PC).
A control post is a PC, laptop or Windows-compatible tablet with special software installed. A control post is necessary, for example, when providing simultaneous control of a large number of KM.

The following are located on the KM surface:

A connector for connecting a power supply unit*
A power switch*
SMA connector for connecting an HF antenna
A LED indicator of the status of the controlled blocker.
USB connector
RJ-45 connector**
* when operating in autonomous mode and using a WLAN network for data transfer
** when transferring data over an ETHERNET network. In this version, power is supplied to the KM from the switch via a common twisted pair (POE).

The parameters of the light and sound signaling are set via the USB port.

Technical characteristics of KM
Frequency range, MHz 25-6000
Maximum input signal level, dBm -5
Interfaces USB, WLAN, ETHERNET
Supply voltage, V 5
Current consumption, mA, no more than 800
Dimensions, without antennas, mm 109x60x27