That would be the KXV3, the so-called "transverter interface" which includes the required IF output. It also has the rx antenna in/out jacks, which is why I bought it. On 2/17/2010 6:28 PM, DAVID GROPPER wrote: > What is the $100 board that he mentioned was needed in the K3? > Or did I mis-hear or mis-understand? -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/