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TSEC/KYV-2(A) Secure Voice Module SVM

Background

The military has a need for secure communications. These fall into two general catagories: Voice and Data.
The method of encryption depends on the channel used. For VHF voice communications the VINSON comsec system has been in place for a number of years. The more popular crypto boxes for this system are the TSEC/KY-57 for ground equipment and the TSEC/KY-58 for airborne applications. The TSEC/KYV-2 and -2A were designed to implement VINSON on the PRC-68 series squad radios. The system also is known as SAVILLE.
Example of TSEC/KY-57 sound. (random noise).

The KY-57 sends a synchronization header at the start of each transmission. The radio operator should hear beeps when the crypto box syncs. There is no provision to hear a clear transmission when the SVM is installed on a radio. i.e. if the radio operator hears a voice when the SVM is installed the only way is if the transmission is encrypted. This will prevent mistakes.

When the SVM was developed the PRC-68 and PRC-68A were in service. The Magnavox part number for the SVM is 705293-801. This is probably different from their part number for the KYV-2.

Since the TSEC/KYV-2 and 2A use the same algorithim as the KY-57/-58 then they use Continuously Variable Slope Delta-modulation (CVSD) to convert between digital and analog.

The SVM (same as TSEC/KYV-2) is the unit shown here. The "A" version is about 2 inches long vs. the 3.5 inches for the original version and instead of a multiple PCB construction is made all in one module. The "A" version weighs only 9 oz. compared to the 14 oz for the original.

When the SVM is used the battery life is cut in half with either the KYV-2 or -2A.

The SVM (KYV-2) is a self-contained solid state unit consisting of four directly interconnected printed circuit boards (PCB) enclosed in a wrap-around aluminum case. The TSEC/KYV-2 must be disassociated from the AN/PRC-68 or AN/PRC-68A for plain text communications, since there is no receiver plain text override capability. The TSEC/KYV-2 will store only one cryptographic variable at a time.

SVM TSEC/KYV-2A. The SVM, TSEC/KYV-2A is interchangeable with, and is the follow-on for the SVM, TSEC/KYV-2. The SVM, TSEC/KYV-2A is a nonreparable, self-contained, solid-state unit that consists of only one PCB formed within a module and enclosed in a wraparound aluminum case. It will not appreciably decrease the AN/PRC-68 or AN/PRC-68A battery life. It is about one and one half-inch shorter than the SVM, TSEC/KYV-2. Operationally and functionally they are the same.

On MCO 2040.10 the Marines ordered over 2,800 SVMs and less than 20 TS-13 test sets. This is an interesting read with info about the PRC-68 and PRC-68A as well as some description of the KYV-2 and KYV-2A.

VINSON is also used in the KY-57 ground and KY-58 airborne voice encryption devices as well as in the Internal COMmunications (ICOM) security upgrade to the SINCGARS RT-1523 radios which are now current.

BANCROFT is used with the KY-67. TSEC/KY-67 and TSEC/KY-67A, Speech Security Equipment, Half-Duplex, Wideband, Tactical, and Ancillary Devices