Description
RM ITALY MLA300 V HF 12V LINEAR AMPLIFIER OUTPUT POWER 300 WATTS
The MLA300 is a broadband RF linear amplifier that covers the range from 1.8 to 30 MHz (160 m to 10 m) and delivers up to 300 watts of output power (average power), putting plenty of pressure on the antenna. It remains flexible: with a maximum input level of 15 watts, it harmonizes perfectly with modern transceivers that deliver 10 watts, but it also works just as well with devices in the 1 to 15 watt range. Four MACOM MRF455 transistors, split into two push-pull circuits connected in parallel in AB mode, provide robust and clean power – exactly what you want for SSB, CW, AM, FM or data modes.
One of the highlights of the MLA300 is its sophisticated filter management. Six low-pass filters (3, 4, 5, 8, 15, 22 and 31 MHz) minimize harmonics and can be selected either manually or automatically. The integrated microprocessor takes over here and adjusts the filters to the operating frequency as needed – a blessing if you frequently change bands. In addition, there are comprehensive protection mechanisms: overdriving, excessive VSWR, out-of-band operation or excessive temperature? The MLA300 will shut down before damage occurs and signal the problem with clear error codes (e.g. 1 beep for excessive input power, 5 beeps for overheating).
Installation is a breeze if you follow the basics – and yes, you should really read the Quick Start Guide! Simply connect the transceiver to the RTX input with a short 50-ohm patch cable, connect the antenna to the output (if necessary via an SWR meter or ATU) and provide a stable 13.6-volt power supply with at least 40 amps. A tip from experience: for mobile setups, connect directly to the car battery and keep the cables (at least 6 mm²) short to avoid voltage loss. The PTT input (active low) is optional, because thanks to RF sense, the power amplifier automatically switches to transmission even without a cable – ideal for quick operations.
During operation, the MLA300 shows its class: the front display provides all the important information – output power, VSWR, active filter – and with a maximum VSWR of 2.5:1, it remains calm even with antennas that are not perfectly matched.
For continuous operation in modes such as FM or data, a little restraint is recommended – the power amplifier can do it, but for longer transmission times (over 1–2 minutes), you should keep an eye on the temperature. However, with good ventilation and perhaps an extra fan, it will run like clockwork even here.
Conclusion: The MLA300 is a real workhorse for the radio operator, combining power, flexibility and safety in a compact package. Whether you are hunting DX, contesting or just ragchewing – with this amplifier you get the most out of your 10 watts and stay relaxed. RM Italy delivers a product that not only impresses technically, but also makes a radio amateur’s everyday life easier. Watt for watt a win!
