[RFI] Dell D505 PA-10 PS

Roger (K8RI) k8ri at rogerhalstead.com
Sun Aug 12 15:19:29 PDT 2012

On 8/12/2012 10:49 AM, Wes Attaway (N5WA) wrote:
> That Acer laptop uses an old AMD CPU that only runs at about 1.6GHz.  That
> is fairly slow compared to the newer Intel i7 CPUs.
> You should be able to cure the PS RFI with some ferrite cores.  Look in Jim
> Brown's tutorial.
> ----------------- Wes Attaway (N5WA) -------------------
> 1138 Waters Edge Circle, Shreveport, LA 71106
>      318-797-4972 (Office) - 318-393-3289 (Cell)
>          Computer Consulting and Forensics
> -------------- EnCase Certified Examiner ---------------
> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
> Behalf Of Patrick Dyer
> Sent: Sunday, August 12, 2012 9:28 AM
> To: rfi at contesting.com
> Subject: Re: [RFI] Dell D505 PA-10 PS
> Tnx all for the advice.  This Acer 5517 laptop even with 3G of RAM runs
> some aps so slowly I'm hesitant to try an XP emulator on it.
> The Dell D505 is a laptop, and the RFI IS from the PA-10 PS/charger.
> Using a Grundig G8 as a sniffer most seems to be radiated from the line
> from it to the laptop (on 89.5 MHz with the PS d/c from the AC c. 8 db
> vs c. 33 db with it plugged in).  It's rated at 19.5 V, 4.62 A out
> running rather warm/hot vs similar devices I've experienced.

1 Gig is far more than enough speed to run XP and 3 Gig of RAM is all a 
32 bit system can use.  The problem is usually all the *stuff* they run 
in the background and particularly the packaged software that comes 
installed on these brand name computers. Often, if you open Task Manager 
and look at processes you will find 50 to over 100 running. Applications 
usually shows only the major applications you are running.  You can't 
just go in and eliminate these without knowing what they do.

There are software packages that will let you get rid of all the 
unneeded *stuff* they install. The results are like a new computer, or 
replacing the old clunker with a new hot rod.

I do not like laptops for this kind of use.  They work, but it's like 
trying to run a horse with hobbles on it.  They are not designed for 
running hours on end such as contests although some get away with it.
CS is my profession, where I have my degree, and I don't even own a 
laptop.  I have no need for a portable system where they are great, but 
I do have a need for all the performance and storage I can squeeze in 
and that pretty much eliminates the laptop from the running. That and 
their "wall wart" battery chargers/RFI generators.

Regular CPUs do what is called "Time slicing". IOW when given multiple 
tasks, they can only do one thing at a time, so they divide the 
available time between applications. That is between the ones you are 
running and the ones the computer is running that you may not know 
about.  When you run two applications the computer divides its time 
between the two, effectively running each one at half speed. It's a bit 
more complicated than that for background processes. Hence a very good 
reason for getting rid of all unnecessary background processes.  It's 
another good reason for running multi core processors.

Another problem is the size of the applications and data they use. If 
the computer is loaded up with unneeded applications it likely will not 
have enough room so it will have to "swap" files between RAM and the 
hard drive. This is almost the ultimate in slow down

I run multi core, AMDs in full size, steel tower cases typically 24 X 7. 
  Laptops they are not at 40 to 60#. It really doesn't matter if they 
are AMD or Intel based systems. You and typical programs normally won't 
be able to tell the difference while AMD processors are much less 
expensive. The smallest PS is 600 watts and the largest is a KW.  Most 
of the video cards run around 300 watts.  I have run 64 bit systems 
since XP came out. I tried two copies of Vista and went back to XP Pro. 
  I now use Win 7 Ultimate 64 bit and FEDORA LINUX in dual boot. Win 7 
64 bit, will run most 32 bit applications. It will also emulate XP.  The 
computers are networked with CAT5 and CAT6.  Absolutely no RFI on any 
band 1.8 through 440. OTOH I can hear a neighbor's router two houses 
over.  Fortunately it's not loud.

BTW XP is still my favorite Windows system.
I'm sure with Jim's tutorial you'll be able to quiet it down unless it's 
a really bad wall wart.  If worse comes to worse you might try a 
different brand of PS/charger

73 and good luck,

Roger (K8RI)

> 73, Pat - WA5IYX
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