D¿13: some personal memories of 24th¿28th May 1944

The paper describes some of the countermeasures preparations made in the weeks before D-Day. A bogus invasion force was devised to fool the enemy, involving the use of radio-jamming techniques. In this period, there was an Intelligence report of a new enemy radar station, which could have put the whole counter-measures operation at risk. The method used and new equipment devised to determine the accuracy of the report are given in the paper.