A spread spectrum mobile station receives a multichannel data communication signal. The airfoil is twisted from a base end of the airfoil to a tip end of the airfoil. Each of the input optical connector cards includes a transmitting dynamic bandwidth allocator responsive to an optical bus clock signal operating at a multiple of a computer system clock signal such that a set of bus time slots are available for each computer system clock signal cycle. Then, at least the interval limit value with the poorer quality measure is replaced by shifting through a step value \u0394 in a direction of another interval limit value. The distal section of the catheter is quite flexible yet it has sufficient transverse or radial rigidity to prevent significant distortion of the transverse cross-sectional shape of the catheter.