The RM Italy KL-503 HD is a 300W linear amplifier for the 25–30 MHz band — covering the full CB band (27 MHz) and the 10m amateur band (28–30 MHz). Designed for mobile or base station use from a 12V supply, it accepts 1–35W of drive power across all modes (AM, FM, SSB, CW), making it compatible with a wide range of CB and 10m transceivers.A six-position power selector on the front panel allows output power to be adjusted to suit operating conditions or licence requirements. An RX preamplifier with electronic switching — activated via a front panel switch — boosts received signal sensitivity when needed. Made in Italy.Key Features Frequency: 25–30 MHz (CB band & 10m amateur) Output power: 300W Input power: 1–35W (all modes) Modes: AM, FM, SSB, CW 6-position power selector (front panel) RX preamplifier with electronic switching Power supply: 13.8V DC ±1V, 40A Max input current: 30A Fuse: 3 × 10A fast blow (5×20mm) Dimensions: 300 × 190 × 67mm Made in Italy Technical Specifications Frequency: 25–30 MHz Output power: 300W Input power: 1–35W Modes: AM, FM, SSB, CW Power supply: 13.8V DC ±1V, 40A Input current: 30A max Input VSWR: 1.1–1.5:1 Fuse: 3 × 10A fast (5×20mm) Dimensions: 300 × 190 × 67mm
