MARCONI INSTRUMENTS LTD. FM Signal Generator Model TF 1066 B/6

Circa 1963

A specialized piece of high-frequency test equipment designed primarily for radio workshops and laboratories.

Use Case:

This device is used to generate and frequency-modulate carrier frequencies ranging from 10 MHz to 470 MHz across five bands. This allowed engineers and technicians to test and align FM receivers, such as those used in broadcast radio, military communications, and telemetry systems. Key functions include:

• Frequency Modulation (FM) and Amplitude Modulation (AM): The device provided both types of modulation, though it was optimized for FM applications.

• Precise Tuning: It features a hand-calibrated, 60-inch effective length tuning scale and a crystal calibrator to provide check points every 1 MHz for high accuracy.

• Variable Output: The radio frequency (RF) output could be varied from a very weak 0.2 microvolt up to 200 millivolts using a constant impedance piston attenuator.

Historical Significance:

The MARCONI TF 1066B signal generator is historically significant as an example of the high-quality, precision test equipment used during the transition from vacuum tube technology to solid-state electronics.

• Technological Shift: The device itself is a hybrid design, incorporating both vacuum tubes (valves) and early transistors.

• Marconi's Legacy: It represents the continued engineering excellence of MARCONI INSTRUMENTS, a company with a rich history in radio communication dating back to Guglielmo Marconi's pioneering work in the late 19th century.

• Precise Engineering: The innovative use of a patented "contactless waveband selection" system and fully stabilized supplies gave the instrument exceptional frequency stability for its time. This precision was crucial for developing the complex VHF and UHF radio systems of the Cold War era.

(H-39.5cm x W-53.5cm x D-27cm)