While an interesting measurement, unless the amp is powered, the characteristics of the active device will be way off.
Now when powered (A learning experience from years ago) there will be quite a bit of white noise generated by the active device.? ?This noise added to the actual reflected signal results in Input Return GAIN.? Not loss.? ? The VNA sees the circuit as a reflection amplifier.? Shades of Parametric Amps from the early days of Radio Astronomy.? ? ??
I'm afraid the NanoVNA just isn't the tool for this job.? ? Kent WA5VJB
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On Sunday, August 15, 2021, 08:57:36 AM CDT, eyecue_two@... <eyecue_two@...> wrote:
IT would help to know what amp you are looking into with the Nano.? I have been able to check and tune mine with the power off by manually closing the keying circuit
