The KW-37, code named JASON, was an encryption system developed In the 1950s by the U.S. National Security Agency to protect fleet broadcasts of the U.S. Navy. Naval doctrine calls for warships at sea to maintain radio silence to the maximum extent possible to prevent ships from being located by potential adversaries using radio direction finding .

Full duplex key generator for encryption of digital data. With various converter equipment handles digital voice, facsimile, computer data, and multichannel teletype. Consists of drawer assemblies from KG-3 and KG-12 equipments.

The sole purpose of the KWR-37 was to automatically decipher the encoded fleet broadcasts which was sent to military ships at sea and other applications where it was required to decode a steady stream of classified traffic. On the input side, the '37 was connected to the 60 milliamp current loop output of a frequency shift converter.

The second generation KW-37 automated monitoring of the fleet broadcast by connecting in line between the radio receiver and a teleprinter. It, in turn, was replaced by the more compact and reliable third generation KW-46.

The KW-7 was designated the prime coding machine for tactical use by NATO and SEATO countries. As such it was in use in embassies, consulates and armed forces of many free world

The material to have been kept aboard included KL-47 for off-line encryption, two KW-7s for on-line ~encryption, tgree KWR-37s for receiving the Navy Operational Intelligence Broadcast, and four KG-l~stwhich used in conjunction with the KW …

the KL-47, KW-7, KWR-37, and KG-14. This would lead to a clear understanding of the principles of electrical encryption used by the United States • The absolute threat to future U.S....

The KWR-37 was a marvel of miniaturization in the 1950s. It contained approximately 500 miniature vacuum tubes for a large number of flip-flops and logic functions, required for the shift registers that generated the pseudo-random enciphering stream.

1. Synchronizing the KWR-37 Using WWV Time Standard a. Five-minute interval synchronization (1) Set inner clock dial to next possible five-minute start time (a) Set outer clock dial for hour change if necessary (2) Ensure CIPHER TEXT indicator is on (3) Depress SET UP button

The main components of the KW-37-as in most of our modem electronic equipments-are printed circuit boards containing relays and transiston and shift registers and combining circuits and the like.