Neil,
The HP3577A VNA with HP35676A test set covers from 5Hz to 200MHz. Only weighs about 70lb.
Some versions of the NanoVNA-H4 firmware work down to 800Hz (I don't know how well).
I don't know if there is an affordable and portable unit that works below 800Hz.
--John Gord
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On Mon, Nov 11, 2024 at 08:11 AM, Neil Preston W0NRP wrote:
Is there any practical way to make a VNA that provides the same measurements
over the frequency range of ~10 Hz to maybe 1 MHz?
Is that something that could be done with computer or cellphone apps?
I know that you can get FFT and scope apps, but I would like to see the Smith
chart for an audio network and other parameters.
Maybe with a variable normalizing impedance....
.... My Christmas wish list.
