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From: Robin Midgett

I've calibrated my NanoVNA & connected it to an approximate 350' length of coax with a known good dummy load on the opposite end. The S11 plot is attached...not pleasing at all.
Can anyone on the list say what the cause may be?
I have ideas, but I don't want to sway anyone's opinion..

Attachments:
350_ coax with dummy load.png: /g/nanovna-users/attachment/9185/0
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Robin,

You might try a TDR plot and see whether there is an obvious discontinuity?

Cheers,
David
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