I just wonder, why not ask Tony Preedy, G3LNP as the Droitwich system was designed by himself. I have a couple of articles written by him. 73, Vaino, OH2LX To All from PA0SE Apparently my remark that
To All from PA0SE Apparently my remark that the carrier of Droitwich goes downwards during modulation has caused confusion. I certainly did not mean "downward modulation" as we remember it from our A