AYU-40 is simple full-QSK 7MHz QRP TX kit. The board is a bound in supplement of CQ ham radio magazine July 2009. Recently JE1UCI Mr.Fukawa is trying to improve the AYU-40 function in ICOM BEACON online magazine. He is a famous QRP homemade instruments writer. By his modification adding a diode, any receiver can calibrate frequency to AYU-40 oscillator stage without transmitting. Above picture is a blogger's AYU-40 in progress, not the modified AYU-40 based on the article. About the AYU-40, you can see one in previous post.
