• a 44.5 to 49.5 GHz LO input (with the DUT operating on the second harmonic of this LO input)
• a 1 GHz fixed IF being sent to Port 2 of the VNA
Setup
A 3743A/AX module will be used to drive the RF port, an external synthesizer (Ext Synth 1) will be used to drive the LO and the DUT output will be sent to Port 2 of the VNA.
• Define band 1: 90–100 GHz
• Int Src = 1/1(f+0)
• Ext Src 1 = 1/2(f–1 GHz)
• Rcvr (Receiver) = CW 1 GHz
Once multiple source is activated, the FREQUENCY menu will be limited to covering 90–100 GHz (the FREQUENCY menu values have to be within the Band range, but do not need to be equal). One could change the FREQUENCY menu to sweep, for example, 92–98 GHz, if that was really of interest, and the multiple source setup does not have to change.
Result
External module control activated in 3739-based modes. The source is enabled but the receiver is not. RF leveling should be used. Phase inversion should be activated (see next subsection, Phase Inversion below).