How to find the length of a piece of coaxial cable with your NanoVNA.
First you need to know the velocity factor of the cable.
Do not connect the cable to the NanoVNA at this time.
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Setup To activate the various menus, click on the right side of the VNA display
and select the following values:
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- STIMULUS / START / 100 k
- STIMULUS/ STOP / 50 M
- DISPLAY / TRACE / TRACE_0 (only)
- DISPLAY / FORMAT / MORE / LINEAR
- TDR / LOW PASS IMPULSE + TDR ON + VELOCITY FACTOR (0.83)
- MARKER / SELECT / ALL OFF + MARKER_1
- MARKER / SEARCH / TRACKING
- MARKER / SEARCH / MAXIMUM
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Now you can connect the coaxial cable to the PORT_1 of your NanoVNA and the coaxial cable length is displayed as follow:
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The above test was carried out with a length of a Messi & Paoloni ULTRAFLEX 7.3 mm cable.
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