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Won't calibrate the radio to antennae, gauge won't reach the mark

When I try to calibrate it it makes it about 3/4 over to the mark, but won't make it all the way. Does anyone have any ideas?

Update (10/01/2020)

It was neither SWR or modulation I was just calibrating the radio to the antenna.

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What are you trying to calibrate? The SWR or the modulation?

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