The KL503HD is a 12V linear amplifier for use in the frequency range 25–30MHz, with a drive power of 1 to 35 W in all modes. The KL 503 HD features a six-position power selector via a a front panel knob and a RX preamplifier with electronic switching, which can be activated via a switch on the front pane

Technical Specifications:

• Operation Frequency: 25-30 MHz (10m Amateur HF Band)
• Modulation Types: SSB, CW, AM, FM, data etc (All narrowband modes)
• Transistor: 8x RM3 Mosfet + 1x RM4 Mosfet Driver
• Max I/P Current: 30 Ampere
• Power Supply: 13 VDC +/- 1V 40A
• Input Fuse (Internal): 3x 10 Ampere (5x20 mm Fast)
• Input RF Power: 1-35 Watt max (All modes)
• Output RF Power: 300 Watt max
• Maximum bypass power (Amplifier off): 50 Watt max
• Input VSWR: 1.1 – 1.5:1
• Output VSWR Maximum: 2.5:1
• Harmonic Output: >-50dBc 25-30 MHz
• Dimensions: 170mm x 295mm x 62mm