Tuning lumped element filters by time domain

Being able to tune filters quickly and accurately is one of the tasks I need to do. At the moment I just use my TG44 and SA44 as SNA.
What would I need to upgrade to be able to use time domain in VNA? if that is at all do-able.

Obviously the VSG25A would be required.

We don’t have any VNA hardware or software support. In theory, you could measure your filter’s pass band phase response using a VSG25A, BB60C, and some fancy software that does not currently exist. The multi-tone feature on the VSG, with parabolic phase tones (for low peak-to-average power ratio), combined with the BB60C streaming I/Q data, could be combined in a clever way to measure phase response, easily up to 25 MHz, or wider by patching several results together. It would take some work…

I use a miniRadio Solutions VNA ‘Tiny’… it covers 1MHz-3GHz for cheap!

I use a combination of the mRS VNA, the SA44B as a receiver, and the VSG25A as a transmitter.
Works well so far…

Jared

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