Transmitter and receiver locating device

A directional locating device, comprising:

• means for transmitting radiating RF signals at a stabilized frequency and carried by an object the direction of which is to be determined from a distance remote therefrom;
• receiver means located remotely from said transmitting means for receiving said radiated RF signals to provide indication of the direction to said transmission means, and comprising a sense antenna and a directional antenna;
• said receiver means comprising:
• a one-half wave delay line responsive to the signal detected by said directional antenna for generating a 180 degree out-of-phase signal with respect to the signal detected by said sense antenna;
• said directional antenna is a loop antenna;
• a variable inductance coupling transformer having a primary winding connected directly to said sense antenna and the output of said one-half wave delay line to produce at a secondary winding of said transformer a summation signal representing the summation of said 180 degree out-of-phase signal and the signal detected by said sense antenna;
• RF amplifying means for amplifying said summation signal;
• oscillation means for generating a second stabilized RF signal at a different frequency than the RF signals radiated by said transmitting means;
• mixer detector means responsive to the amplified summation signal and said second stabilized RF signal to generate an AF signal indicative of the direction of said transmitter means from said receiver when said directional antenna is rotated to any given position relative to said transmitting means;
• amplifying means for amplifying said AF signal;
• and
• a speaker connected to receive said amplified AF signals for generating audible and non-audible signals, the latter being indicative of the direction of said transmitter means from said receiver.