Tinker & Rasor PD-5 - Auxiliary Oscillator

The Model PD-5 Oscillator has been designed to be used with the Model Mark V Ranger Pipe & Cable and Short Locator. The PD-5 fits into the Mark V Ranger Transmitter panel, for convenience, but operates as a separate instrument.

Although the Mark V has the potent combination of Power and Sensitivity, this can be radically enhanced with the addition of the PD-5 Auxiliary Oscillator. This 25 watt powerhouse has been known to supply enough energy to a well coated pipeline to allow cross country surveys of 15 miles from a single connection point. 

A signal of 750 C.P.S. is generated by using a power transistor switching circuit. This arrangement eliminates troublesome vibrators, buzzers or other moving part elements. The Oscillator converts low voltage (12 volts) DC to stable audio-frequency AC directly; hence, by a highly efficient method, the input current to the Oscillator is only 1.7 amperes for a full output of 15 watts, a conversion efficiency of better than 80%.

In order that a maximum of energy can be transferred from the Oscillator to the pipe, the output of the Oscillator is provided with taps so that voltages of 2.5, 5, 7.5, 15, 50 and 100 volts are available to match the load. An interrupter (Signal Pulse) is provided to make the signal more easily recognized. The Interrupter is actuated by a switch on the panel of the Oscillator. The Oscillator will produce 15 watts of 750 Cycle signal into a 500-ohm load with the output selector set at the 100 volt position.