The A models superseded the original models. The A models include all of the upgrades that were available via Service Bulletins for the KY-196/197. These improvements include the following:

• Expansion to 760 from 720 (i.e. 135 to 136 MHz)
• 9 channel memory
• Remote frequency transfer capability

The products improvements in the A models include some technical and production improvements which enhance the overall reliability of the radio. The A models utilize a different mounting rack than the original KY-196/197 radios.