A new generation of the Baby-QRO switching amplifier targets 25W to 50W of RF output for FT8 and other FSK modes.

It is designed to operate with a Bare DDX-Commercial transceiver board and has an inbuilt T/R switch.

Design

3D render:

Baby-QRO amplifier v15 render

Results

To be tested!

Usage

The input RF comes directly from the Si5351 (3.3V). You can use our CW-SigGen project to generate a suitable test signal. It is also possible to pair this amplifier with our Easy-Digital-Beacons-v1 project.

Caution

The boost module can generate a high-voltage rail of around 75V at startup. To help tame the power-supply startup transients, we added a physical switch and a capacitor load before feeding this supply into the amplifier.

Cost

Cost for ~50W: Around 20 dollars - for everything including PCB and BOM components

Time to build

Time to build: Less than 30 minutes - no coils to wind - yay!