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Bomac 1B38 S-band pre-TR Cell, frequency range 2.7 to 2.91GHz. This measures 81x38mm by 42mm deep. The window is 48x22mm, and it weighs approx 400g.

The 1B38 was developed in late 1943 and has a 1MW capability. It is filled with a mixture of argon and water vapour at approx 1cm Hg. It was typically used in tandem with a 1B27.

1B38 end view

1B38 side view

1B38 inside viewA view inside the 1B38, showing basically an empty box.
1B38 box 1B38 in its box
Thanks to Bill Wagner for providing this device.

This file was last modified 14:59:27, Tuesday September 02, 2014