in one embodiment of the system a phase delay is measured between a remote signal originating at the transceiver station and a corresponding decoded timing signal received from the repeater station correlation of the phase delay with a reference value ascertains the distance between the stations and an alarm at the transceiver station is actuated when the distance exceeds a predetermined value a second embodiment of the system employs a clock driven counter that is stopped when a predetermined multiple of decoded timing signals is received at the transceiver station in response to iterative transmissions therefrom the count value of the counter is read and correlated with a transit time reference value to ascertain the distance between stations an alarm is actuated if the distance exceeds a predetermined maximum application_number US 43023295 A description the embodiments of the invention hereinbelow disclosed rely on block diagrams to describe certain apparatus and various circuit elements together with their respective functions these diagrams therefore represent hardware features that would be known to those skilled in the art to whom this specification is addressed although not in the novel combinations disclosed accordingly the following constitutes a sufficient description to such individuals for a comprehensive understanding of the best mode to give effect to the embodiments disclosed and claimed herein fig1 illustrates a basic proximity alarm system 10 in accordance with the invention wherein a transceiver station referred.