The Model 2940A is a two-channel 400MHz DDS Signal Generator in a table top instrument case. The 2940A generates two different output frequencies simultaneously from 200kHz to 400MHz in 1Hz steps. The 2940A can be locked to an external frequency standard or used with its internal temperature compensated crystal oscillator (TCXO). Optional internal amplifiers and 60dB step attenuators can be added. Simple front panel control or RS232 allows setting of all parameters, which can be saved into non-volatile EEPROM memory upon power down. The Model 1940A is a 1U rackmount version with up to four frequencies and programmable output levels.