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One of the main aims of the LOPES experiment was the evaluation of theabsolute amplitude of the radio signal of air showers. This is of specialinterest since the radio technique offers the possibility for an independentand highly precise determination of the energy scale of cosmic rays on thebasis of signal predictions from Monte Carlo simulations. For the calibrationof the amplitude measured by LOPES we used an external source. Previouscomparisons of LOPES measurements and simulations of the radio signal amplitudepredicted by CoREAS revealed a discrepancy of the order of a factor of two. Are-measurement of the reference calibration source, now performed for the freefield, was recently performed by the manufacturer. The updated calibrationvalues lead to a lowering of the reconstructed electric field measured by LOPESby a factor of $2.6 \pm 0.2$ and therefore to a significantly better agreementwith CoREAS simulations. We discuss the updated calibration and its impact onthe LOPES analysis results.

Revised absolute amplitude calibration of the LOPES experiment