When I try to transmit, my 447HPC2 displays E4 and won't key. Shawn November 11, 2016 22:43 You have a high SWR. E4 means SWR protection mode stopped the radio from transmitting to avoid damaging your radio. Related articles SR-447HPC2 Error Codes and what they mean High SWR shutdown - How to Temporarily Turn it Off Common factors that cause high SWR readings SR-447HPC2 Setup Guide Radio shows SWR HI When you key the microphone to transmit Comments 0 comments Article is closed for comments.
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