Transmission of signals via land line for magnetic tape copying and other applications

The techniques described enable analogue or digital signals reproduced using one magnetic tape machine to be transmitted via land line cable and copied using another machine situated remotely (at least up to 270 meters). Also signals, generated using transducers for example, may be transmitted from a remote location to a tape recording machine or other receiving equipment. A frequency divider in conjunction with standard magnetic tape reproducer hardware provides a simple means of the low pass filtering of data recorded in frequency modulated form. Consideration is given to the production of an intermediate tape with filtered data.