Methods and apparatus are shown for providing information on a pill. A transmit-receive FM-CW radar apparatus according to another mode of the invention comprises: a mixer for downconverting an IF signal; a switch for turning on and off a local signal to be supplied to the mixer; and a switch controller for controlling the switch on and off in different modes and selecting the local signal in the different modes for supply to the mixer. A fluid media is directed to flow tangentially over the second surface of the membrane. Diagnostic methods utilizing compositions of the invention are also provided. As a result, among others, the venting of the crankcase is not hindered, which takes place by way of the timing chain case. The bottom wall is substantially circular and the top portion includes two substantially semi-circular sections joined and overlapped along the straight edges to form an overlapped region.