I have a raspberry pi 3 model B ,and an rtl sdr related to amplifier and polariser ans a rotator yaesu g5500 ANS A YAGI ANTENA VHF , I have resolved the undervoltage message by buying a new adatator tp my raspberry pi but still have no waterfall data file found
Good to hear that the issue is solved. About the rotator, unfortunately I can not help a lot, but other may do. Also you can search a solution in the existing forum threads, if you don’t find any, I suggest you open a new thread about it.