The Hytera TC508 operates across UHF: 400-470 MHz, VHF: 136-174 MHz. Several band versions exist; which one to buy follows from the frequency assigned to your organisation. UHF passes between walls and obstructions more readily, which is why it is preferred inside buildings, industrial plants and dense urban areas. VHF carries further over open ground and water at the same power.

RF output power is 5W/2W (VHF), 4W/2W (UHF). More power is not automatically better: it extends range and shortens battery life at the same time. Teams working close to a repeater are usually served by the low setting, which also lengthens the shift.

Capacity is 16 channels. The channel plan is designed inside that limit, and headroom should be left at the start so that growth does not force a reprogramming exercise.

Battery 1650mAh Li-ion, with a manufacturer-quoted life of 14 hours (5/5/90). That figure is measured against the 5/5/90 duty cycle: 5% of the time transmitting, 5% receiving, 90% standby. High power, analogue mode and cold weather all shorten it.

Receiver sensitivity is ≤0.224uV. Sensitivity states how weak a signal the radio can still decode, and a lower number is better. At the edge of coverage it determines range as much as transmit power does — communication usually fails not because the other party cannot hear, but because the radio cannot decode a weak signal.