Tellurometer

The tellurometer was the first successful microwave electronic distance measurement equipment.

He was also responsible for the Wadley Loop receiver, which allowed precision tuning over wide bands, a task that had previously required switching out multiple crystal oscillators.

The resulting phase shift is a measure of the two-way distance travelled.

[6] Plessey, the British electronics company, formed a new subsidiary known as Tellurometer (Pty) Limited in the 1960s to manufacture the product and to develop and sell derivatives.

[5] The company subsequently introduced numerical displays, solid state transmitters, integrated circuits and eventually microprocessors for the product.