display upper right SWR:nan0

[Constrainted]

I am testing SWR into a dummy load. With USB 5V power, CW mode, press PTT gives first the result SWR:1.0 in the upper right hand corner of the display. If I hold PTT, the display switches to SWR:nan0.

What does SWR:nan0 mean?

Thanks.

73 de Contrainted

[Constrainted]

I switched over to the antenna and used the nanoVNA scans to set the tuning to about VSWR 1.5-1.8 over the 40m band. When I test the SWR with the truSDR, the reading is SWR:1.0, too good to be true. Any explanation?

73 de Constrainted

[Constrainted]

I switched over to the antenna and used the nanoVNA scans to set the tuning to about VSWR 1.5-1.8 over the 40m band. When I test the SWR with the truSDR, the reading is SWR:1.0, too good to be true. Any explanation?

73 de Constrainted

Menu 2.8 Practice
ON

was the cause of the SWR 1.0 result. Without practice mode, the SWR was 1.15.

73 de Constrainted