I just bought the Acutrac 22 as well, What I found out with some research, is the right circular polarity is automatic, 13volts gets the odd transponder (if you don't have the Pro, changing channels on the receiver switches between 18 & 13 V as well). The 22Khtz switches between the 101 & 119, the 119 need the 22khtz. The video at solid signal is good, but sounds like there referring to the birddog and not the acutrac 22, but both will work.