[ILQSO] Powering a laptop

[Hank Greeb]

My lap top computers use a 17 volt charger, they're powered from 3 3.7 
Volt Lithium Ion or Lithium polymer cells in series, which give 11.1 
volts, but the charging circuit seems to need 16 vols or so to run it.  
In the car I use a Rat Shack DC/DC converter to generate the 17 
volts.....  Both it, and the "wall wart" power supply are quiet on my 
laptop computer.  If either were noisy, I'd put them inside metal boxes 
and use filtering on the input/output rather than figuring out a unique 
power supply.

73 de n8xx Hg

John Geiger wrote:
> Here is a question I have for you mobile ILQP county activators:  I have a laptop in the shack that has a noisy wall-wart/switching PS-it puts noise on various parts of 20m, and on 80, and probably other bands.  I am now thinking of trying to run it off of the shack's PS since that seems to be quiet.  Have you powered your laptop while roving directly off of 12 volts?  Is there any special things to look out for, or potential problems in doing this.  Now I know that the laptop might take something other than 12 volts,and I will check into that first and find the proper voltage adaptor.
>
> I guess you have seen the results of the winter storms hitting Oklahoma on TV.  I am happy to report that we were far enough south to avoid the damage.  Our power never went out, the antennas only got a little coating of ice on them which melted after a day or so, and there were only a few tree branches knocked down around town.  We do have snow forecasted for today and tomorrow, and it has started raining lightly out. Still, compared to the rest of Oklahoma, those of us in Lawton were extremely blessed!
>
> 73s John AA5JG