We want the microwave signal from our VNA E5071C to be amplitude-modulated by a ~kHz TTL signal, as shown in the following figure (figure from Harder et al., Physics Reports 661 (2016) 1–59):
Can the external trigger of E5071C work like a microwave switch to accomplish this amplitude modulation? We tried it but found that the external trigger could only turn *on* the microwave signal; it could not turn the signal *off*, let alone switch the signal on and off at a high frequency. Did we operate/observe it correctly?
I would like to make sure that there is no way to switch the E5071C signal on and off at a ~kHz frequency without using a fast microwave switch before I really purchase a switch, which will cost me a small fortune. Thank you.
P.S. Recommendations of economic models of ~kHz switches are welcome, if I really need one to accomplish this lock-in measurement.