an oscilloscope would be a much better option. Particularly those that have the audio range.
Otherwise, could divider circuits, say a 10 or 20 to 1 ratio be used to measure audio frequencies? Obviously you'd have to read the NanoVNA with the ratio in mind, but perhaps that is an option one could explore.
Regards
Colin
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On 2024-11-11 5:58 p.m., Manfred Mornhinweg wrote:
Since the NanoVNA covers from 10kHz up, one can use the sound system of a PC with suitable software to provide the lower frequency coverage. Even the most basic sound chip in a PC will cover 20Hz to 20kHz, and often the low frequency coverage extends to a few Hz. Some better audio cards also offer coverage beyond the audio range, to 40kHz or even more.
Software like ARTA-LIMP allows making useful measurements.
Smith charts, I don't know. I don't use them much myself, as for most situations I find standard X/Y charts more practical. But of course it's perfectly feasible to write VNA software for the PC sound system, that generates Smith charts too.
