... reconnaissance, electronic jamming and technical analysis of ground, airborne, cellular and trunking VHF radio links operating at fixed frequencies and in the frequency hopping spread spectrum mode (FHSS). When operating coupled to a similar product, the R-934B provides direction finding and determination of the coordinates of radio emission sources. The station is capable of detecting radio links operating in the FHSS mode, with a frequency hopping rate of up to 1,000 hops per second.