«GROZA» UHF VHF radio communication jammer

Radio reconnaissance designation of the jammer:

- automatic search, detection, determination of bearing and coordinates (when operating as mated pairs), technical analysis of ground and aerial VHF/UHF fixed-frequency and frequency-hopping (with up to 1000 hops-per-second rate in 30 MHz band) radio emissions;

- reception and transmission of information to the control post.

Jamming designation of the system: jamming of ground, aerial and satellite VHF/UHF radio communication links:

a) up to 20 fixed-frequency links quasi-simultaneously;

b) one frequency-hopping link with up to 500 hops-per-second rate in 30 MHz band.


Radio reconnaissance operating frequency band

30-3000 MHz

Jamming working frequency band:

30-3000 MHz

RMSE of direction-finding, maximum

Threshold sensitivity of radio receiving device (3 kHz passband and SINAD 10 dB), not worse than:

-110 dBm

Peak sensitivity of radio receiving device (RX) of the detector/direction-finder (in 30 MHz simultaneous scanning band), not worse than:

-100 dBm

Signal frequency error (in detection), not worse than:

3 х 10-11

Minimum duration of the detected signal

1 ms

Simultaneous scanning bandwidth (variable, maximum value), not less than:

150 MHz

Simultaneous scanning bandwidth in multisignal direction finding, not less than:

30 MHz

Frequency scan rate (in 30 MHz simultaneous scanning bandwidth), not less than:

25 GHz/s

Frequency tuning step in technical analysis mode, not worse than:

1 Hz

Frequency resolution in detection and direction finding mode (in 30 MHz simultaneous scanning bandwidth), not worse than:

200 Hz

Quantity of fixed-frequency links jammed simultaneously in one radio transmitter letter

Up to 4

Quantity of fixed-frequency links jammed simultaneously in 5 radio transmitter letters

Up to 20

Level of high harmonic components of the jamming signal, not more than

minus 60 dB

Frequency-hopping radio reconnaissance with number of hops, not more than

1000 hops/s

Response time for shaping spot jamming at controlled fixed frequencies within the limits of working letter of the power amplifier, not more than

12 ms

Response time for shaping jamming of frequency-hopping radio communication links in up to 20 MHz band, not more than

0.8 ms

Memory (storage) of values of jammed frequencies, not more than:


- fixed frequencies


- hopping frequencies


Transmitting antennas gain:


- in the band from 27 to 90 MHz, not less than

4.5 dB

- in the band from 90 to 2700 MHz, not less than

6 dB


The designer and manufacturer is OJSC “KB Radar” – the managing company of the holding “Systems of radiolocation”