Abstract: A data card using a simulator for magnetic stripes in generating a data signal. The data signal is read by a magnetic coil, having a drive signal provided to the coil by a circuit on the card which simulates the magnetic flux reversals of the magnetic stripes.

Abstract: A rotary switch is provided having a manually engageable control to which is attached an arm carrying a number of switch contact fingers for rotational motion with the control. A printed circuit board has concentric circular arrays of contact pads each of which are contacted by one of the finger contacts on the rotating arm. The outer array of contact pads are connected together and are located in a position counterclockwise from the center array of contact pads which are also connected together. The inner array of contact pads are also connected together and are located in a position clockwise from the array of center contact pads. An innermost continuous contact strip is provided for contact by one of the contact fingers. The contact fingers are electrically common and provide a repeated contact sequence for outer, center and inner contact pad sliding connections for a clockwise rotation of the manual control.

Abstract: A multichannel signal transmitting and receiving apparatus comprises a single reference local oscillator, a phase locked loop including a phase comparator receiving as one input a signal resulting from a frequency division of the output of the local oscillator and a voltage controlled oscillator, a frequency divider for supplying the output of the voltage controlled oscillator as another input to the phase comparator, a circuit for heterodyning a signal received through an antenna with the oscillation outputs of the voltage controlled oscillator and the local oscillator and thereafter detecting the signal thus heterodyned thereby to obtain an audio signal, a frequency converter for obtaining a carrier wave for signal transmission from the oscillation outputs of the local oscillator and the voltage controlled oscillator, a circuit for modulating the carrier wave thus obtained with the audio signal and transmitting the modulated signal through the antenna, a circuit for controllably changing over the oscillatio