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Hi Ron
If it is the SWR indication build into your radio you are referring to, and your radio has an internal antenna tuner (or I would rather call it a impedance matching network), then the radio is matching to the actual antenna impedance when tuning so the PA stage see a close to 50ohm load impedance. Thus you can newer compare a NanoVNA SWR measurement of the antenna with a SWR indication in the radio display.
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Ron - An Old Ham in Utah
Sendt: 15. november 2019 16:45
Til: [email protected]
Emne: [nanovna-users] SWR...Nano versus Transmitting

This is my first post after lurking since October, so I'm quite new to the Nanovna. The Nanovna measurements of SWR are considerably lower than what I'm seeing when I transmit on-the-air. What does this indicate? Calibration problems, or errors in my other equipment? Any insight would be greatly appreciated. Thanks.
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Ron, K7UV