Re: [wsjt-devel] RFI

[Jim B. <k9...@au...>]

On 3/16/2019 3:58 PM, Martin wrote:
> I have a Thinkpad W540 and tried using one of the mobile 19V supplies - 
> the same voltage as the Lenovo factory power supply.  When I booted I 
> got a new screen I'd never seen before.  Lenovo was telling me to go out 
> and buy a genuine Lenovo power supply.  I haven't looked further but I 
> guess they are using some signal riding on the 19 V to do this.

Equipment using lithium batteries requires a battery charger with 
regulation designed for the specific battery type. My guess is that the 
computer is sensing for that characteristic.

73, Jim K9YC