Posted by
Stewart A. on
URL: https://www.es-forum.com/Marc-Arjuna-beware-laptops-too-also-blowdryers-tp1542893p1542968.html
Marc Martin wrote:
>> I agree the monitor frequency is a large contributor.
>> What I want to add, is that choosing 800x600 is not the whole picture.
>> Is that at 75 Hz? 72 Hz, 70 Hz, or 60 Hz? etc.
>>
>
> Generally, I've been finding that lower refresh rates are better,
> as long as I'm not bothered by the flicker. At work, I think
> I'm using 72hz. I thought I was using the same thing at home,
> but I just checked and it said that I was using 60hz! (for
> some reason I am unbothered by the flicker, even though it
> is a CRT)
>
>
In the past, I also tried to keep refresh rates down, around 60. It
leaves me curious why I can now tolerate the higher frequency. Or how
much of it is in the monitor's electronics.
>> Is it legal to name names?
>> I sure wish there was a list of what components are quietest, instead of
>> the usual advertising sold to consumers.
>> I'd sure list the ones I didn't like.
>>
>
> I think it's good to be as specific as possible with brand names.
>
>
Good! Lets see if I can type this out...
Back when I first became sensitive, there were many brands available in
the retail store where I worked. I could not tolerate the IBM ValuePoint
series, and blamed it on their power supply, being the common part. I
had to stick to the PS/2 series for my workstation, and back then IBM
made a big deal about engineering their top line for low emissions.
Spelled Quality.
5 years ago, when I started getting better, the old tech no longer did
what I wanted, and I got a Soho SY-7VBA 133U motherboard and Intel
Pentium 733. Nvidia GeForce 2MX was a good video card, and still is
quietest that I've tried. At that point I found the PS/2 Model 77 was
now noisier than the new box.
Later I tried an Intel 1.3Ghz Pentium3 Tualatin-core and decided it was
no big change.
I had to get rid of my NEC Multisync 3Ds, which was bothering me more by
whining and whistling, and because my brother's Samsung Syncmaster
531TFT was ok, I started exploring LCD monitors.
Atec Neoview AL181 18" LCD w/TV was ok, but not as clear or fast.
Viewsonic VX900 19" LCD was bad.
Planar PL1700 17" LCD is Very Good and quiet.
Seems there is a line between 17 and 19 inch. Larger is not better.
Last year I tried an Asus Geforce 4 MX440 and did Not like it. But the
NVidia GeForce4 MX 440 DVI (with a different card design) was ok. The
cards that worked fast enough to need a fan, were categorically worse.
When I discovered Stetzer filters, I mixed and matched various power
supplies with motherboards.
Just swapping the power supply made a big difference on the GS meter.
Going from PowMax 300W ATX to a SunPower 300W made the GS reading go
from 780 down to 110-120.
Just swapping 4 power supplies and 4 motherboards and 5 video cards and
other cards/drives around made a long page of notes of various
combinations that emphasized how little it takes to change the emission
levels.
PowMax 300W dual power supply was bad. Probably the extra circuitry for
switching back and forth.
Steven's computer was Asus K7M with AMD-750Mhz and 3dfx Voodoo3 graphics
and FSP-250W power supply.
It was fairly quiet, too bad the hard drive controller went out. Stetzer
reading on that computer was 60GS.
His new computer is MSI K7T266Pro2 with AMD XP-1700 at 1.4Ghz
withGeforce2 MX400 and PowMax 250W power supply. Before components got
swapped around, i thought it was fairly quiet. Enough so, that I
explored getting another MSI motherboard. I found there was a
significant difference between the Pro2 and Pro2A. So each design has
it's own fingerprint. Makes it hard to compare Manufacturers.
My current motherboard is Asus A7V8X-X with AMD AthlonXP 2000
Thoroughbred. With the Sunpower and Geforce4 in an aluminum metal case,
my Stetzer reading is 115 GS.
Steven's monitor setting is 1024x768 at 70Hz vertical refresh. and the
other resolutions his X server is setup with, 640x and 800x are for
75Hz, and they are definitely noisy to both of us. I'll have to input
some 60Hz configurations and see how those fare. (That's why he can't
stand the lower resolutions...ah ha)
This year after getting a Spectran spectrum datalogger, I "needed" a
laptop to get readings from the field.
Got an IBM Thinkpad A20m 2628-41U at 700MHz. Definitely Not quiet. but
somewhat tolerable... from which I made the graphs on my web page
<
http://www.geocities.com/sandreas41/spectrumGraphs.html>. On March 18,
I aimed the antenna at the Thinkpad, so it shows up there.
Other equipment to note:
APC power Back-UPS very bad. Anything to do with power conversion DC to
AC has been noisy.
KSI InfraRed keyboard. In an attempt to keep my hand away from the
mouse, I tried this. Unfortunately, the circuitry powered by 2 AA
batteries was not much better, and showed up on the ZapChecker too.
Due to technical problems, locking up 1 second every time I moved the
mouse left at a certain speed, I gave up that idea.
Telephones:
I no longer have anything to do with transformers. If it needs to be
plugged in to AC power, it is noisy. Not just magnetically.
No caller ID, no LCD display.
I like the GE phones, models 2-9315, 2-9316, and 2-9433.
Hope this is useful!
Stewart
[Non-text portions of this message have been removed]