Been meaning to buy some of the QRP Labs filters. So just purchased the Linear kit along with the filters. This will let me experiment with lowering the drive through the whole uBITX TX chain, most likely by greatly reducing the audio level, and see if and what improvements are made.
Most likely I'll mount the amp and filters in a stand alone box with an Arduino that will measure the TX frequency and automatically select the correct filter.
I'll include a small dummy load for the TX power to go until the correct filter is selected. Because the description of the amp claims the amp will survive large mismatches, I'll probably use something significantly higher than 50 ohms for the spurious output safety dummy load.
Tom, wb6b
