According to JA 6m band plan, DIG mode is allocated between 50.300-51.000MHz.
In order to follow our band plan, I request for moving 6m frequency to higher than 50.300MHz.
Otherwise, no JA can involve this exciting challenge on 6m.
By the way, I have ever worked with VK4 on 6m on ordinary SSB mode by means of small disk transistor with 12V/10mA.
I have confidence that this particular program would be succeeded when the freq. were moved above 50.3MHz for Japan.
Regards,
Hiro/JA1LZK