The antenna tunes fine but as soon as I speak into the mike at full power the RED fault LED comes back on and the SWR goes very high. What is the problem?
A. The tuner is going into bypass. It could be a problem with the tuner or it could be that you are getting high levels of RF on the tuner control wires and feeding it back into the interface causing the PIC processor to wake up and reset the tuner. Try better grounding at the tuner and the radio. The 4-conductor wire between the radio and the interface should be short, certainly no longer than one foot. As a last resort, try re-routing the tuner control wires to keep them away from the antenna and try ferrite beads on the control wires at the interface end. Normally this is not a problem since the interface uses RFI filters on all of its inputs and outputs. If you are experiencing this problem it is most likely a matter of insufficient grounding at the tuner.
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