Wow!  That Ky-28 unit looks as large and heavy as the KY-8 units I had aboard my ship.  What contributed to the size and I assume the weight of the KY-28?  I sure did not want to try and lug around a KY-8.  Luckily, all my issues with my KY-8's were from the key insertion device.  The RM's had a lot of difficulty in setting up the slides and inserting the device into the KY-8.  I normally would be in the crypto room "assisting" with the setups.