Even after years of searching and study, there are still a significant number of items in the 1946 Argus report that have not been identified or collected. The mounted images displayed in this section summarize the state of our understanding of them in October, 2015.

Guided Missile Component: The photo in the 1946 report shows a short cylindrical component about 8 inches in diameter in which two small vacuum tubes can be seen. The electronics of guided weapons used in the war tended to be much larger and more complex (e. g., employing such things as television cameras and radar transmitters) so this Argus component would had to have been a part of a more complex system. It is also possible that it was misidentified by whoever captioned the photos back in 1946.

Homing Adaptor: Homing adapters (apparently spelled “adaptors” back then) receive a high-frequency beacon signal and convert it to a lower frequency that could be input to a radio compass or similar receiver. This allowed the radio compass to be used for both long-range and short-range (beacon) transmissions. The ZB-1 and ARR-1 homing adapters were commonly used during the war. The device shown in the 1946 report does not match either.

Glide Path Test Accessories: Two small boxes are shown next to the TS-170 (the “glide path test unit”) in the 1946 report. Jerry Woodhall of the Bendix Radio Foundation thinks they would have been suspended at various locations in the path of a transmitter to evaluate its beam pattern. No other explanation of them has been found.

Antenna Loading Unit: This component is very close in appearance to the MT-36 antenna loading unit covered elsewhere in the exhibit. It will probably be one of the first of the “unknown” devices to be identified.

Antenna Rotator: More a mechanical device than an electronic one, the antenna rotator fits with very little else in the 1946 report. One interesting long-shot possibility is that it was the rotator for the truck-mounted antenna of the SCR-629 (covered in the VHF omni-range section of the exhibit).

Multiplier Mechanism: Another mechanical component that fits with nothing else in the 1946 report. We e-mailed a picture of it to the proprietor of an airplane “bone yard” site in Arizona, asking if he had ever seen it in decades of salvaging and scrapping WWII-vintage aircraft. He had not.

Tuner for Transmitter, Power Supply Unit, and Control Panel: All of these items are generic-looking electronic components. Not much else can be said about them. It will take time and some luck to identify them.