Bought a used unit, v1.8, S/N: 9896610673
I connected it to my car, the unit powered up fine. I checked the options, everything was factory defaults.
I disabled X-band, Ka more responsive, there is no POP, Euro or J in this unit so I was ready to go.
Started driving around, the unit was too quiet.
I went to the speed sign near my house, which is a K-band. Unit is SILENT!
I powered off the unit, then powered it back on. I went full K-band alert for 2 seconds or so, then went silent again.
Plugged my new 3.872 V1, full K-band alert, continuous.
I then tried an Escort 8500 unit, full K-band alert, continuous, 24.135, 24.142, 24.000 GHz alternating freqs.
Now, the used V1 came with the old type 12V adapter, not the newest type. I don't know if that matters, because I'm not using the power plug that came with it.
I guess I can send it in for $45. I figured I'd see what everyone thought.