On Tue, Feb 05, 2008 at 08:06:58AM -0600, John Hasler wrote:
> Douglas A. Tutty wrote:
> > Sure. We don't have florescents, nor even halogens. Plain ordinary
> > (soon to be discontinued) incandescant.
>
> Halogens are incandescents. They just use a bit of chemistry to run hotter
> than ordinary incandescents.
In the process, we've been told by EMF researchers, they also emit more
EMF than regualar non-chemical incandescents.
Doug.
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02-05-2008, 03:23 PM
John Hasler
low-MHz server
I wrote:
> Halogens are incandescents. They just use a bit of chemistry to run hotter
> than ordinary incandescents.
Doug writes:
> In the process, we've been told by EMF researchers, they also emit more
> EMF than regualar non-chemical incandescents.
Who are these EMF researchers?
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02-05-2008, 03:31 PM
Ron Johnson
low-MHz server
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On 02/05/08 08:35, Douglas A. Tutty wrote:
[snip]
>
> I write this sitting at a Digital VT 520.
Amber screen?
Get a DECserver and then the F5(?) key lets you break to a terminal
server prompt and log into another machine. The VT lets you switch
between 4 different logins.
> Right. Its ancient, mid-1990's technology for which I am looking. One
> that will take the memory and drives to handle today's software and
> data-set size. Unfortunatly, that was during the shift from propriatary
> busses to standardization on PCI. For example, by the time IBM RS/6000
> PPC boxes used PCI, they were just over 200 MHz. They were nice looking
> boxes, able to keep three PCI busses busy: two full scsi busses feeding
> two gigabit networks while running around 300 MHz with 4 PPCs. They
> still command a high price. I've never heard of anyone having one die
> on them.
>
> Ron, what other ancient hardware do you remember that may be suitable.
> I can browse eBay, search eg: "166 MHz -GHz" for each MHz about which I
> am aware, but I can't do that for the wider Google-land. Are there big
> server boxes that I am overlooking?
Geez, that's sooooo long ago. The slowest active machines that we
have are AlphaServer 4100s running at 300MHz, and they were rolled
in by Sungard as replacements for systems destroyed in 9/11.
Even the older AS100A machines were upgraded quite a few years ago
to 400Mz.
I strongly urge you to create EMF shield cages around modern systems
and run old X Terminals as displays. The VXT 2000 and a 19" monitor
was a sweet system, but only had 4MB RAM. Maybe an old PC with a
beefy PCI video card would be better.
> I'm also going to look into scsi drive holders in case I end up with a
> server with few bays.
>
> Thanks Ron,
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02-05-2008, 03:35 PM
Ron Johnson
low-MHz server
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On 02/05/08 08:57, Douglas A. Tutty wrote:
> On Tue, Feb 05, 2008 at 07:26:47AM -0600, Ron Johnson wrote:
>> On 02/04/08 23:03, Douglas A. Tutty wrote:
>> [snip]
>>> Sure. We don't have florescents, nor even halogens. Plain ordinary
>>> (soon to be discontinued) incandescant. Analog radio is fine (IIRC,
>>> intermediate frequency of 155 MHz).
>> Visible light is 100,000GHz and infrared is 10,000GHz. Ultraviolet
>> is even higher. How does she survive?
>
> Well, humans have their own half-decent sheilding for that. The skin
> prevents UV damage to the nervous system beneath it, it also turns
> infrared into heat which is cooled by the blood. The skull shields the
> brain from most of this stuff and sunglasses when outside take care of
> the rest.
Hey, I know!!!! Shave her head and wrap her whole body in "Faraday
mesh".
But seriously, Faraday cages shielding the computers are where your
energies should be focused.
>
>
> OK, so my ancient box only has to be functional until we have
> holographic computers with isolinear chips and data is stored in
> hyperspace.
>
>
>
> Seriously, I don't know what the upper limit on the range of troubling
> frequencies are. It is higher than that found in consumer electronics
> right now.
>
> Doug.
>
>
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02-05-2008, 03:51 PM
Christopher Judd
low-MHz server
On Tuesday 05 February 2008, John Hasler wrote:
> ...
> And everything at a temperature above absolute zero emits radiation at all
> wavelengths.
Not really.
-Chris
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02-05-2008, 03:58 PM
Christopher Judd
low-MHz server
On Monday 04 February 2008, John Hasler wrote:
> David Brodbeck writes:
> > ...have you considered putting the machine in another room and placing
> > only the monitor, keyboard, and mouse at your wife's workstation?
>
> Or put the computer in the basement and set her up with a diskless
> X-terminal based on an old, slow pc.
Or use long cables to give her a remote keyboard, mouse, and monitor.
I've done that in the past in an industrial setting. Use well shielded
cables or they'll act as broadband antennas.
-Chris
PS FWIW, I doubt that it is really the high frequency fields that
she is sensitive to, but without another explanation, you have to go
with what works for you. FYI, UHF TV signals are in the 70 - 1000 MHz
range. It would be hard to escape these anywhere near civilization,
although the signal strength may be quite low.
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02-05-2008, 04:59 PM
Chris Lale
low-MHz server
Hello Doug.
The VIA EPIA 5000AG Fanless mini ITX runs at 533Mhz. I don't know if you can
find a way to underclock it.
Fanless VIA Eden 533MHz Processor, Up to 1GB PC133 Ram, Onboard VGA, Serial,
4xUSB v1.1, LAN 10/100, Parallel. Does not have TV out.
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02-05-2008, 06:40 PM
David Brodbeck
low-MHz server
On Feb 5, 2008, at 5:16 AM, Ron Johnson wrote:
How does she walk across the street, under the power-lines?
Powerlines are 60 Hz. He said anything under 200 MHz is OK, so that
should be a non-issue. (Assuming there isn't any broadband-over-
powerline system in his area, at least.)
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02-05-2008, 07:06 PM
Ron Johnson
low-MHz server
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On 02/05/08 13:40, David Brodbeck wrote:
>
> On Feb 5, 2008, at 5:16 AM, Ron Johnson wrote:
>>
>> How does she walk across the street, under the power-lines?
>
> Powerlines are 60 Hz. He said anything under 200 MHz is OK, so that
> should be a non-issue. (Assuming there isn't any
> broadband-over-powerline system in his area, at least.)
I thought that it was a higher frequency (as well as voltage) up to
the transformer. Maybe I'm wrong...
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02-05-2008, 08:35 PM
Kent West
low-MHz server
Ron Johnson wrote:
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On 02/05/08 13:40, David Brodbeck wrote:
On Feb 5, 2008, at 5:16 AM, Ron Johnson wrote:
How does she walk across the street, under the power-lines?
Powerlines are 60 Hz. He said anything under 200 MHz is OK, so that
should be a non-issue. (Assuming there isn't any
broadband-over-powerline system in his area, at least.)
I thought that it was a higher frequency (as well as voltage) up to
the transformer. Maybe I'm wrong...
I can't say you're wrong, but I can say that changing voltage is easy,
requiring a simple transformer; changing frequency is a bit harder and
would require some additional circuitry; I can't see the power companies
bothering to change the frequency; I see no advantage to it.
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