Thanks to Roy WN3F for alerting me to this. Tadashi-san has really built some beautiful stuff. Especially impressive to me is his use of the spectrum analyser and two-tone audio tests to look at IMD of the entire transceiver. See video above. FB OM.
Be sure to check out 7L4WVU’s YouTube channel:
And his QRZ page heralding his all-homebrew station covering 1.8 to 430 MHz: https://www.qrz.com/db/7L4WVU
Excellent video with interesting test data. Also, incredible homebrew construction. The type of construction that I can only dream of performing.