This is the original nanovna I purchased (after which I started
[email protected]) in May 2019. The firmware is as was shipped/delivered, never updated (although I started the group and have enjoyed the many discussions since then, I've had little time to use the device.
Question is this - after SOLT calibration at the female device port (no jumper except for the thru test, using the O S L parts that were delivered with this nanovna device in mid 2019), reflection loss S11 with open port does not match expectation.
Frequency limits set to 1 and 100 MHz, followed by OSLT calibration at the device ports. Repeated this to reduce chance of operator error. The standards are those that were shipped with the nanovna in 2019. Device is running with it's internal (original) battery, fully charged.
With port open, S11 shows 7.5 dB (not ~0 dB; starts at 7.50 dB ends at 7.53 dB) across the frequency range (visible both with logmag and smith chart formats.)
With port shorted, S11 is ~0 dB across the frequency range.
With port terminated, S11 is ~-80 dB across the frequency range.
Transmission loss (S21) is < 0.5 dB across the frequency range (0.2 to 0.5 dB).
I do not recall seeing S11 with open port of this nature in the past, although again I've made little use of the unit since new.
Am I doing something wrong? Does this seem like a device issue?
Thanks,
Dave
