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Re: [RFI] Car laptop adaptors

To: "Jim Brown" <jim@audiosystemsgroup.com>,"RFI List" <rfi@contesting.com>
Subject: Re: [RFI] Car laptop adaptors
From: "Jim P" <jvpoll@dallas.net>
Date: Sun, 11 Nov 2007 21:06:27 -0600
List-post: <mailto:rfi@contesting.com>

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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