The spike at the extreme left could be WWVB at 60 kHz. Have no idea what
the spike at 1.8 MHz might be.
Dave - W?LEV
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On Mon, Feb 6, 2023 at 7:36 PM Brian Beezley <k6sti@...> wrote:
N6LF has been trying to calibrate his NanoVNA-H4 through a wideband balun
for common-mode current suppression when measuring an open wire line ground
probe. He has had perplexing results. As a test he tried paralleling two
50-ohm loads, calibrating the VNA with that load, and then measuring it. He
did not disconnect/reconnect the load and he measured it immediately after
calibrating. He got the results depicted in the plots.
Resistance is off 1 part in 5000 and reactance has an upward creep at LF
of more than that. Spikes occur. Are these results reasonable?
Brian
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*Dave - W?LEV*
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Dave - W?LEV
