I have a friend that just installed VarAC for the first time this morning. He installed V5.1.8. He is using a FTDX-3000. He is using CAT control for PTT & Frequency. He is has VarAC frequency control configured to use Digital_USB. When he sends a beacon his TX shits + 400 HZ. His FTDX-3000 Digital mode is set to PSK. Any idea why his transmissions are 400 HZ high? He has been using FT-8 with no issues for some time.