KGT-28 is an encryptor while the KGR-29 is a command authenticator and decryptor.  In the photo below, these devices were the ones fitted in the satellite. The corresponding devices on the ground were packaged in a slightly different enclosure.
KGT-28/KGR-29 photo courtesy of Ralph Simpson

Looking for photos of the KGT-28 and KGR-29 ground based equipment.


Contributors and Credits:

1) Ralph Simpson <ralphenator(at)>
2) Lloyd.Joly(at)


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