Xiegu GPA100 amplifier

Description

The Xiegu GPA100 is a 100W solid-state linear amplifier designed for amateur bands from 1.8 to 50MHz. It’s built to pair with QRP rigs like the ICOM IC-705 and Xiegu’s G90, X5105, X6100, and X6200, though it’ll work fine with any transceiver that needs a boost.

This is a solid-state design, so you won’t be dealing with tube maintenance or replacement. The amplifier uses an intelligent control unit and what Xiegu describes as an advanced cooling system to keep things stable under load. The thermal design allows operation up to 55°C, which should handle most operating conditions without issue.

Performance Specifications

The GPA100 delivers 100W output on HF bands below 29.7MHz, dropping to 80W above 50MHz. Current draw sits at 25A during transmit and just 0.3A in standby, making it reasonable for portable operations with appropriate battery capacity.

The circuit design focuses on efficiency and lower distortion, which translates to cleaner signals at full power. This matters when bands are crowded and you want to minimize splatter. The frequency coverage spans 1.8–50MHz, covering all the amateur HF and 6-meter allocations.

Physical Design and Display

At 2.6kg and measuring 245 x 164 x 82mm, the GPA100 is lighter than previous models thanks to structural optimization. It’s compact enough for field operations or mobile installations where space is limited. The weight reduction doesn’t feel like a compromise in build quality—the unit maintains adequate rigidity for typical operating environments.

The front panel includes a display showing real-time operating parameters: power output, SWR, voltage, and current band. This gives you immediate feedback during operation without needing external metering, which is useful for monitoring performance and catching antenna issues before they become problems.

What’s in the Box

The package includes the amplifier, user manual, L4001 cable, and an 8-core connection cable. Setup is straightforward, though you may want to reference the manual or contact Xiegu support for specific calibration questions or advanced configuration details.

Practical Considerations

The power reduction above 50MHz (to 80W) should factor into your planning if you operate heavily on 6 meters. For most HF work, the 100W output provides plenty of capability without the complexity or expense of higher-power alternatives.

Bottom Line

The Xiegu GPA100 is a practical amplifier for operators who need reliable performance across HF and 6 meters. It’s not trying to be everything to everyone—it’s a straightforward, portable solid-state amp that does what it claims. The combination of reasonable weight, efficient power consumption, built-in monitoring display, and broad frequency coverage makes it a sensible choice for both fixed stations and portable operations.

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