Hi. Has anone experienced interference on their VHF when their sounder is working ? On mine, where I have just replaced the transducer with a different brand but same frequency (150kHz), I get a lot of noise with a clear "pip" of the sonar pulses, even with the squelch turned right up. This on handheld as well as hard wires radios. Also, the sounder switches off when the wired VHF is switched on. I suspect high resistance somewhere between the battery and instruments.