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HY - 2
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HY-2 VOCODER (Voice Coder)

Designed in 1961, this device was used for converting speech into a form compatible for encryption by a general purpose key generator (ie KG-13) and transmission over a narrowband radio or telephone channel. It was a 16-channel, 2400-bps system using “Flyball” color-coded modular logic to reduce the weight to 100 pounds.The HY-2 was widely deployed in Vietnam but according to NSA web documents, President Johnson refused to use the HY-2 because of its poor "Donald Duck" sounding quality. Its wide deployement is confirmed by its use in AUTOSEVOCOM I, a worldwide secure voice network used by the US government in the 1960's.
The HY-2 was the last generation of channel vocoder technology in the US.
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This example of the HY-2 can be found in the National Cryptologic Museum. (Photo by Doug Eyre)
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Another view. (Photo by Vin Simmons)