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Re: [RFI] 12vdc native laptop

To: "RFI Reflector" <RFI@Contesting.com>, <kd4e@verizon.net>
Subject: Re: [RFI] 12vdc native laptop
From: "Jim Miller" <JimMiller@STL-OnLine.Net>
Date: Wed, 24 May 2006 10:02:02 -0500
List-post: <mailto:rfi@contesting.com>
Looks like way too elaborate a setup and way too many problems and not
enough power.  Easy way that has worked for 15 years for me is to just buy
one of the 12v to 120v inverters and use it in the car.  I have not been
bothered by RFI problems.  The ones I use I bought 15 years ago and they are
300w and still work great.  Simply use the power modules (wallwarts) that
came with the equipment and plug it in.  Many advantages to doing this and
using an outlet strip (or two) so you have many outlets for a laptop, the
GPS, cell phone, rechargers for the HTs, 120v for the scanner, rechargers
for the spotlights, 120v for a TV for the kids (or you), 120v for a real
trouble light with a 100w bulb instead of a flashlight for use when you have
problems, take your 120v computer printer along too if you want.  You can
use anything in the car you have at the house keeping the combined current
at any time below the limit of the inverter, that is your only limiting
factor.  MUCH easier and MUCH more available and probably a lot cheaper.
Way back then, my 300w inverters were $40 each, I have several, one in each
car and now a bigger 1200w one if my emergency "GO" box.

73, de Jim KG0KP

----- Original Message ----- 
From: "doc" <kd4e@verizon.net>
To: <12VDC_Power@yahoogroups.com>
Cc: "tvi-rfi-emi" <tvi-rfi-emi@mailman.qth.net>; "RFI List"
Sent: Tuesday, May 23, 2006 11:16 PM
Subject: Re: [RFI] 12vdc native laptop

> Larry D. Barr wrote:
> > I've never seen a native 12 VDC laptop. Of course, that doesn't mean
> > they don't exist <G> I've had really good service from the Lind
> > Electronics "Auto/Air Adapters". They make for just about everything. I
> > have one for each of the three laptops I have and they work great. Seem
> > to be quite efficient too. I cut into the input line and fit Anderson
> > PowerPoles inline, so I can use 'em with the RigRunner in the shack or
> > just plug the cigarette lighter plug back on if I need to.
> >
> > http://www.lindelectronics.com/
> I am going to have HF, VHF, & UHF gear in a box
> between the seats and the laptop will sit right
> on top of that same box.
> My dc-dc converter is multi-voltage 15, 16, 18, 19,
> 20, 21v 4.0A 65W max  P/N:  GW-P006VB
> I have yet tested it with the HF rig I plan to take
> mobile because I haven't bought the rig yet!  :-)
> I will try it close to the mobile VHF/UHF rig.
> Using a little Grundig 100PE mini-handheld this laptop
> wipes out everything from AM-BC through 18MHz at a
> distance of several inches and raises the noise floor
> considerably a couple of feet away -- that is on AC
> power.  No difference on battery power.  It is
> hardwired to the Internet router so it is not a wireless
> nic generating the noise.
> The IBM ThinkPad 600X is even worse -- without being
> powered on!  And the RFI increases when powered on.
> I cannot imagine that some of the noise from the
> dc-dc converter won't get into at least the HF rig.
> Have to hit the hay but will test my dc-dc converter
> tomorrow.
> I know that there are mini-pc's now that come
> with 12vdc power supplies.  I may have to look
> to see what those 12vdc input power supplies
> are outputting.
> As I recall a non-laptop requires 12vdc and
> 5vdc, no 18 or 19v so maybe that is the solution?
> I also use Powerpoles everywhere now.
> -- 
> Thanks! & 73, doc kd4e  http://bibleseven.com
> Ham Links: http://bibleseven.com/hl.html
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