|Signal Center, Pentagon Building, Washington DC. Signal sideband transmission in transmitter room showing a press wireless 40-kw transmitter in the foreground, which is driven by the Western Electric 15D-6000 single sideband exciter on the right. In this way, more than one teletype circuit can be handled simultaneously on just one transmitter. Here the S/Sgt. holds a water-cooled type 233 transmitter tube which is the same as used in the 40-kw amplifier while the M/Sgt. makes a distortion test on the Western Electric transmitter. August 1946.|
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