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KY - 171 / KY - 172

 
 
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KY-171/KY-172

Ralph Simpson introduces the KY171/172.

"The KY-171 Audio Frequency Coder was used in the Mercury Project (the first US space flight program that put Alan Shepard in space and John Glenn in orbit). This was paired with the T-560B transmitter to communicate with other ground stations and the space capsule. The receiver was the R-669A which used the KY-172 Audio Frequency Decoder. All these devices were part of the radio set AN/FRW-2 (406-549 MHz), which as far as I can find was first introduced in 1956 and originally used for sending ballistic missile telemetry".

For photos and additional info, visit Ralph's web site.

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See detailed pictures of the KY-171 Audio Frequency Coder

This is the KY-171 Audio Frequency Coder used for the NASA Mercury Project (1958-1963) to encode radio traffic between ground stations, and ground stations and the space capsule. It is used with the T-560B Radio Transmitter to send encoded telemetry data. The transmitter bypassed the coder when used for emergency voice backup. The R-669A Radio Receiver is paired with a KY-172 Audio Frequency Decoder and the C-1669 Coder Control to decipher the messages. All of these devices are part of the AN/FRW-2 Radio Set.