Frequency range Low Band (33 – 48.5 MHz, 57 – 57.5 MHz) has been used since the USSR era for mobile land radio communications. The range is adjacent to television frequencies, which is why in some regions of Russia its upper limit is restricted. This range is characterized by good radio wave propagation in open areas, including rugged terrain. Obstacles such as damp forests and small hills cause only a minor reduction in communication distance. On the other hand, dense urban development and significant distance between correspondents substantially degrade communication quality in the 40 MHz range.
Signals of transceivers operating in the radio frequency range Low Band are highly susceptible to industrial interference, interference from household electrical appliances, and radio and television transmitters. The use of transceivers of this standard is optimal in rural areas, where the level of radio interference is significantly lower than in urban areas. Accordingly, the lower portion of the VHF range (LOW BAND) is characterized by the ability to bypass terrain irregularities and propagation beyond line of sight. The LOW BAND range demonstrates excellent communication range performance usually between fixed and vehicle-mounted radio stations, while handheld walkie-talkies have a shorter range due to the low efficiency of helical antennas, as the wavelength is much longer than the antenna itself. Portable radios operate satisfactorily, whereas vehicle-mounted and fixed stations perform well.
Other frequency ranges: LPD (433.075–434.775 MHz), PMR, VHF (134–174 MHz), UHF, CB radio frequency band.