Antuino 2.0

Daniel Walter
 

Tried out my Antuino 2.0 during FD and was a bit disappointed. While the SWR curve and minimum agreed with other meters, SWR was rather far off. a 1.1:1 20 M antenna read as 2.5:1 on the Antuino. Other antennas were similar. Now home, I checked SWR with a 51ohm pure resistive resistor and it reads 1.2:1 at 14.1 MHz. a 100 ohm pure resistive resistor read 3.5:1 on 20 meters! Any ideas on how to calibrate to make this accurate?
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Dan, NM3A

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