Mike, go through the forum wiki - there is a note about using 75 ohm modified firmware that will work on any of the original? and H nanos (not the H4).
The firmware is in the files section.
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On Friday, July 9, 2021, 9:44:44 a.m. EDT, Mikek <amdx@...> wrote:
I recently started a thread about using the NanoVna on 75 ohm TV antennas. I haven't found any success with a simple 50 ohm and 100 ohm resistor.
I Have tried just a connector adapter and a 50 to 75 ohm matching pad. I go thru a calibration with a 75 ohm resistor, then install either a 50 ohm load or a 100 ohm load.
Both measure about 30% low. What am I missing?
I know there is software to use with a laptop to display and manipulate the results from the NanoVna.
Is there any software that will recalculate and adjust the data to a 75 ohm system? Or can the be made?
? ? ? ? ? ? ? ? ? ? ? ? ? ? Mikek
P.S.
All the videos I watch about this always put a filter on the NanoVna so I can't tell what it's doing. Is there a video where someone just puts on resistive loads and shows the result?
