The GDP Model 652 Data Transmission Test Set fills the need for high performance data-link verification and qualification at an affordable price.  The user is provided with two totally independent channels, and each channel provides independent transmit and receive functions.  This allows for rapid fault isolation and data link characterization.  Features such as an internal 6-digit frequency synthesizer and IRIG-106 Bit-Code generator and converter make the Model 652 especially suited to the test and evaluation of data link systems and components.