Just installed my KRX3. With the sub receiver set to main ant, it sounds like there is no antenna connected to the sub rcvr. If I switch the sub rcvr to ATU and connect the antenna to Ant 2 it works fine. MCU is 2.58 and DSP1 & 2 are 1.94 - just reloaded them. Did I miss something? Thanks for any help. Paul 2LE