[SECC] Need advice on car laptop DC-DC converter

[Greg Potter]

Hi John,
 
Just FYI  ...
 
One of my super technical County Hunting buddies (W0QE) did a lot of
research and recommneds a Cotek S300-112 inverter for mobile use.  He used
it extensively in his mobile.  The reports are that they are very quiet.
 
Regards,
Greg NM2L
Sugar Hill, GA
 
 
 
 

-----Original Message-----
From: secc-bounces at contesting.com [mailto:secc-bounces at contesting.com] On
Behalf Of John Getz
Sent: Monday, May 30, 2011 1:59 PM
To: secc at contesting.com
Subject: [SECC] Need advice on car laptop DC-DC converter


I discovered why I can't hear many of the weak stations that are calling me
when I
am operating mobile in the state QSO parties.  The 12-18 volt DC converter
that
powers the Toshiba laptop is creating RF hash on all the bands.  It even
makes
noise when it's running separately outside the car.  I've tried several
types of
filtering but no luck.  If I run on the laptop battery, the bands are nice
and quiet.  
However that battery is only good for about 90 minutes.  Does anyone have a 
recommendation of a car converter that will make 18-19VDC and not make RF
noise?
 
As an aside, I have two identical 117VAC to 19VDC converters.  One only puts
out a slight bit of noise and the other one is quiet.  Next weekend I'll be
operating
portable in the ALQP so I can power the laptop off the generator with the
quiet
one.  I plan to operate in 5 or 6 counties.  It should be a fun contest with
about a 
dozen mobiles out and about.  If you have time, please work all of us.
 
John Getz, AD8J
24 Stony Ridge
Asheville, NC  28804-1854
828-424-7145


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