Jim,
On 13/10/21 10:46 pm, Jim Lux wrote:
On 10/13/21 7:33 AM, btomek@... wrote:
How is the sweep synchronized in both of these devices? Unless it doesn't have to be synchronized, but it seems to me that it does.
You have to turn off the sweep on one while making measurements on the
other. Otherwise there's interference, which shows up in the S21 trace.
Sort of like if you have a transfer switch (or swap cables) and a single
1 way VNA, you make a sweep, flip the switch, make the sweep the other way.
I'm working on some python code to do the sweeps alternately, but
haven't had time to finish it.
What benefit does this approach offer over using a DPDT/transfer switch? Is this just a cost concern?
I note for example that a transfer switch approach would solve concurrent access to multiple NanoVNAs, impedance matching, simultaneous sweeping, etc.
- Roland 9V1RT
