Motorola DTR series 900 MHz frequency hopping hopsets

From HFUnderground

These radios operate with 50 kHz channel spacing and 8-level FSK digital FHSS]] 902-928 MHz band (channels start at 902.525 MHz and continue to 927.475 MHz, 525 kHz from band edges for a total of 500 available channels at 50 kHz channel spacing), in compliance with Part 15 of the FCC rules - specifically 47 CFR 15.247. The DTR 900 MHz digital business radios offer performance comparable with UHF walkie-talkies as far as in-building coverage goes.