[bars] NanoVNA - measure resonant freq of parallel L/C circuit?

[Marla Wallace]

One possibility (have not tried it!): at the J1 connection place a resistor (value = ?) in series with the LC circuit.  Then connect J2 across the LC circuit.  The transfer function should show a peak at resonance.

> On 02/25/2026 12:24 PM EST Andy Wallace via bars <bars at w1hh.org> wrote:
> 
>  
> Does anyone here know how I can use this to (like an old grid dip meter) measure the resonant frequency of a parallel inductor-capacitor circuit? I imagine it uses only the S11 upper port. 
> 
> Tutorial link much appreciated. Other than doing the cal I have not used my NanoVNA. 
> 
> Thanks
> Andy
> KA1GTT
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