A short investigation in the old wall stirring method for reverberating chambers

One of the oldest theoretical methods of stirring a reverberating chamber, shifting a wall, has been simulated and compared with the now common stirring methods. Comtest has devised a way for the complex operation of shifting a wall of a shielded room and has a pending patent on it. Wall stirring has a couple of advantages over the common rotational stirring. The main advantage is that there is no stirrer anymore that has to be placed away from the walls and so in effect is placed in the middle of the chamber. A stirred volume of 10 % can easily be achieved with only one stirrer, so only one actuator and maintaining a large working volume. The chamber is well shielded by building the moving wall inside the shielded box and no stirrer means less surface so a higher Q factor.