Which was quite fun.”īecause the static, ground-based exhibit would have no actual radar hooked up, Moore worked out a way to feed the display a simulated signal that mimics what a navigator would have seen as he flew over actual terrain. “So we built modern circuitry around the old tubes, but as far as we could using the original method of doing everything. However, “we did have supplies of the old cathode-ray tubes,” explains John Moore, the technical lead on the H2S project, along with “a container full” of thermionic tubes. Unfortunately, while the Imperial War Museum does have an original display in its collection, it is illegal to modify it in any way. The most direct way to ensure that visitors would have an authentic experience would be to use a vintage H2S indicator display. The operator had to manually adjust an altitude-compensation dial to eliminate the zone. As a first-generation piece of technology, it had a number of interesting quirks, such as a blank circular zone at the center of its display, with a radius that reflected the plane’s altitude above the ground.
The H2S was the first ground-scanning radar to be mounted on an aircraft, and made it possible to bomb long-range targets at night and in bad weather from 1943 on.
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