Update:
The Thinkpad 380ED (an older model laptop to be
sure) was satisfied with a Vbatt source w/o the engine
running - diagnostics indicated the battery was in
charge mode ... but this particular laptop also has just
a 10.8 V 'pile' (battery).
JimP // WB5WPA //
----- Original Message -----
From: "Jim Brown" <jim@audiosystemsgroup.com>
To: "RFI List" <rfi@contesting.com>
Sent: Sunday, November 11, 2007 6:45 PM
Subject: Re: [RFI] Car laptop adaptors
> On Sun, 11 Nov 2007 10:50:07 -0600, Jim P wrote:
>
> >Just looked at the service info for an:
>
> > IBM Thinkpad 380ED (updated w/Win98)
>
> >Reviewing the service manual the expected voltage
> >range out of the AC mains/DC power supply itself
> >(not necessarily the laptop's requirement) shows to
> >be in the range of +14.5 to +17 VDC with 'tip'
> >positive.
>
> >I'm going to try Vbatt straight straight into this laptop
> >because the inverter I've got is just too noisy on ten
> >Meters even!
>
> My experience is that my IBM T-series laptops run on a direct
> connection to the car if it's running. I've tried running them from
> a 12V battery (not being charged), and the charge regulator inside
> the laptop cycles between charge and discharge, so not ideal. So I'd
> say for these laptops at least, 14VDC is enough.
>
> 73,
>
> Jim K9YC
>
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