The transceiver supports several advanced industrial signaling frameworks:
Built-in 2-tone, 5-tone, CTCSS, and DTCS capabilities for selective calling and group management. Panel Description & Controls icom icf121 manual
Operating the IC-F121 is straightforward once the memory channels have been populated by an authorized technician. Powering On and Volume Control icom icf121 manual
150(W) × 40(H) × 167.5(D) mm (5.91 × 1.57 × 6.59 inches) Weight: 1.1 kg (2.4 lbs) Front Panel Interface icom icf121 manual
The manual often omits the "Master Reset" procedure or hides it in the cloning section. If you need to reset the microprocessor (which clears all memory):