Hi Steve,
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Make sure that you're not in practice mode.
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When I tried testing my SWR a little way back, I got similer results and wondered if I broke something. I then realised that I had the rig in practice mode. Once I disabled it, it was all fine again.
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Note that it doesn't transmit in digimode either when in practice mode.
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I hope that fixes it.
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Mel. M0KMD