Change 3 is intended to harmonize DO-210D and ARINC 741. The scope of Change 3 is limited to a) changes involving output amplifier intermodulation effects and tests related to such effects@ and@ b) changes involving the performance characteristics such as harmonics@ spurious@ and noise emissions that depend on the shape of the diplexer filter. The goal of these changes is to achieve the maximum commonality possible with ARINC 741@ as approved in October 2005.