HDTenEightyP/NetNews huggingface dataset:
From: dbushong@wang.com (Dave Bushong)
Newsgroups: sci.electronics
Subject: Re: Radar detectors
Date: 29 Jul 92 11:22:00 GMT
Organization: Wang Labs, Lowell MA, USA

martin@yvax.byu.edu writes:


>I heard about a device that would 'confuse' radars making them think
>that the car is going at lower speed; does anyone know anything about
>this?.        

There was a gadget on the market briefly around 10 years ago that
did this - it transmitted a modulated 10.525 GHz signal with the
modulation freq set by a knob calibrated in MPH (jeeze!) but later
produced with the calibration in Hz.  It required a ham radio license
to operate it.  I haven't seen this thing on the market in a long time.

There was an article in one of the hobby electronics magazines (Pop. Elec.,
etc.) at roughly the same time that used a coffee can as the cavity,
and passively reflected the radar signal with some new modulation on
top of it (that is, any speed you select).

I wish I had more details about issue number, manufacturers, etc., but
you might try one of those online magazine database services and look
for some of the keywords that would apply.

Hope this helps!

Dave

-- 
==========================================================================
Dave Bushong, KZ1O@K1UGM.MA         +    No .sig, no tattoo, 
Wang Laboratories, Inc.             +        no bald spot, no nothin!!
Internet: dbushong@wang.com         +-------------------------------------
Project leader, OCR Products        + (reserved for future expansion)
Newsgroups: sci.electronics
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Subject: Re: SHOCKING STORIES
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Date: Fri, 24 Jul 92 03:40:40 GMT

Others said
#      Um, what's the medical procedure for a very bad shock?  I didn't
# think there was any, besides grounding the body.  Is it related to
# fire exposure, as voltage can often cook parts?

#1 is cardiac, I suspect. If you go into defib, you'd better get
shocked again, and soon.

#2 is fluids. It seems that one of the effects of INTERNAL burns is to
overload the kidneys with toxins. So they dump large quantities of
saline solution into you to help flush it out.

#3 is external burns from the shock.

{I'm no MD, and I don't play one on the Net. But a few years back a
friend created a nasty arc in a cabinet full of coal dust and set
himself on fire in places. They THOUGHT he'd zapped himself, too, so he
got the full court press.}

--
A host is a host from coast to coast..wb8foz@skybridge.scl.cwru.edu
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
From: v078p6g8@ubvmsb.cc.buffalo.edu (Richard M Wasserman)
Newsgroups: sci.electronics
Subject: 68000 assemblers
Date: 23 Jul 92 15:54:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


	I was wondering if anyone out there could point me towards a 
public domain 68000 assembler or compiler - direct mail replies would
be greatly appreciated.  Thanks in advance,
		Rich
From: gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON)
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Date: 23 Jul 92 00:48:16 GMT
Organization: Georgia Institute of Technology

>feliccia@rodan.acs.syr.edu (Nicholas J Feliccia) writes:
>
>>Ok. I want to know from the net people. What is the largest voltage shock
>>you have ever received (and survived.) I am not talking about rewiring
>>a light switch. I am talking about kissing the flyback transformer.
>

I suppose it is not the highest voltage, but it is about the funniest 
shock I have encountered:

I worked for a summer for the GM car dealership my father works for.
While I was there, there was one mechanic that always was working on
an atrociously rusted out Ford truck that he owned. The only decent
item in the truck was the engine/transmission, and he spent much
time tinkering with it ( I thik it was a modified 429, or something).
Another mechanic got the bright idea to play a joke on this guy-
the truck had one of those Accel Super Coils on it; they seem
to produce about 50 Kv or so. The other mechanic procured a roll
of new spark plug wire from the parts department (while no one was 
looking :-) ), put a terminal on one end, and plugged it in in
place of one cylinder in the distributor cap. He then ran the other 
end in through a rust hole in the floor of the truck under the seat, 
and ran the wire up into the seat cushion until it was about 1/2" from
the seat cover. He then let the hood down. Moments later, the first
mechanic came out, got into the truck and started the engine. Needless
to say, he immediately jumped out of the seat with enough force to put
a small dent in the roof of the truck!

Disclaimer: Please, don't repeat this! It can be dangerous! We were
all young ignorant fools back then :-) 

REgards,
Gordon.

-- 
WATERS,CLYDE GORDON-Georgia Institute of Technology Atlanta Ga 30332 
******<LANGUAGE IS A VIRUS! - Laurie Anderson-Home of the Brave>******* 
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt0869a
Internet: gt0869a@prism.gatech.edu
Xref: sparky sci.electronics:13451 sci.materials:563 sci.physics:11825 sci.engr.chem:388
From: rb9a@kelvin.seas.Virginia.EDU (Raul Baragiola)
Newsgroups: sci.electronics,sci.materials,sci.physics,sci.engr.chem
Subject: Re: PZT Excitation
Date: 28 Jul 92 12:38:49 GMT
Distribution: na
Organization: University of Virginia

In article <24938@dog.ee.lbl.gov> sichase@csa2.lbl.gov writes:
>In article <1992Jul27.185909.19949@pbhyg.PacBell.COM>, rhsomer@pbhyg.PacBell.COM (Bob Somers) writes...
>> Is there any material that acts as an insulator
>>from magnetic forces?  I was told some time ago
>>that there is none, but perhaps some new material
>>will do this.
>>	Bob Somers, Pacific Bell, 510-823-9010
>
>I'm becoming surprised at how often this question gets asked.  An alloy
>called Mu-Metal has very high "mu" and so can provide good magnetic
>shielding in many situations.  It is expensive and somewhat fragile - 
>it can't take alot of banging or extended vibration before the large
>magnetic domains get shattered, ruining its shielding ability.
>
>I have used it to shield image intensifier tubes from stray magnetic 
>fields of many KGauss with no problems.  Apparently, this stuff is 
>well known among HEP grad students, but not in the general physics
>community.  Well, I guess we all don't play in strong magnetic
>fields all day for the fun of it.
>
>-Scott
>--------------------

Well, the HEP are neither the first nor the main users of high magnetic
fields and magnetic shielding.  An important area is electron spectroscopy,
widely used for surface analysis, where you want residual fields of
milligauss. Look at Sevier's Electron Spectroscopy for a discussion of
this. In other applications in atomic or solid state physics
people fields of microgauss or smaller.  
    For kGauss fields, it is better to use iron or other materials
because Mu-metal saturates. 

R. Baragiola
Engineering Physics
Univ. Virginia
Newsgroups: sci.electronics
From: dvsg0223@uxa.cso.uiuc.edu (David Salamon)
Subject: Re: Airport X-Rays
Organization: University of Illinois at Urbana
Date: Wed, 29 Jul 1992 16:21:08 GMT

kludge@grissom.larc.nasa.gov ( Scott Dorsey) writes:

>X-rays will not harm magnetic tapes at all.  However, the enormous magnets
>that X-ray tubes use to focus their electron beam might very well damage 
>tapes.

I seriously doubt that there is any focussing of the eletrons at all.  I think
there is simply a high voltage between a small hot cathode and a larger
target.  If the target is flat (for example) and much larger than the cathode,
then the electrons will follow the field lines and all impact roughly 
perpendicular to the surface.  No focussing necessary.  After all, we don't
care WHERE the electrons hit the target, just that they hit with the correct
momentum.

As others have mentioned, however, the high voltage is produced by a 
transformer, which will create a magnetic field.  Metal shielding of course
will not stop this field, so it could affect magnetic media.  It all 
depends on where the transformer is placed with respect to the conveyer belt.

David

--------------------------------------------------------------
David Salamon                Physics Graduate Student (Slave)
d-salamon@uiuc.edu           University of Illinois
--------------------------------------------------------------

Newsgroups: sci.electronics
From: curt@kcwc.com
Subject: Re: Caller ID
Reply-To: curt@kcwc.com (Curt Welch)
Organization: KCW Consulting, Oakton VA
Cancel-Lock: MD5:9a219bbd0d77b7aa70c3a262da894242
Distribution: na
Date: Thu, 23 Jul 1992 00:57:04 GMT

>In sci.electronics, ferguson@andy.bgsu.edu (Douglas Ferguson) writes:
>The *ideal* solution -- is to have CALL TRACE ...

Then I wrote:
>[I have it,] Anyone can use it and there's no charge.  

In sci.electronics, gtolar@xcluud.sccsi.com (Glynne Tolar) writes:
>We have that service in SE Texas and leave it to Southwestern Bell and our
>Public Utilities Comission, we pay $1/month for the service (no install
>fee, believe it or not) and $8 for each sucessful call trace used.  Nice
>guys!

I was wrong about it being free.  There is a charge every time you use
it (but there is no install charge or monthly fee).

Curt
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Green Layer on Circuit Boards?
Date: Wed, 22 Jul 1992 21:37:36 GMT
Organization: U of Toronto Zoology

In article <1992Jul22.183826.22771@csc.ti.com> jsykes@dadd.ti.com writes:
>I could buy stuff in England that you just sprayed on the board immediatly
>after tinning. You didn't need to mask out the solder pads - the film just
>evaporated around the touch of a soldering iron...

That will be something different.  The main point of the green stuff --
solder mask -- is that it *doesn't* go away at soldering temperature, so
it keeps solder off things that shouldn't be soldered.
-- 
There is nothing wrong with making      | Henry Spencer @ U of Toronto Zoology
mistakes, but... make *new* ones. -D.Sim|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: joe@netcom.com (Joseph Jesson)
Subject: Re: Airport X-Rays
Date: Sun, 26 Jul 92 16:39:23 GMT
Organization: Netcom - Online Communication Services (408 241-9760 guest)


 I am not sure.  Once, I had CMOS memory totally erased after going
 through airport X-ray.  This was on an HP Portable Plus laptop where
 CMOS memory is used for the "C" drive.  Maybe my battery was low since
 I have not been able to duplicate this.  Also, BESIDES CMOS, what
 about FLASH memory on the new laptops...


 --joe
From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Thu, 23 Jul 1992 00:11:40 GMT
Subject: Re: Green Layer on Circuit Boards?
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics

adw@cci632.cci.com (Allen Williams (co-op)) writes:

> However, one step that I think would be a good addition is the green
>layer of plastic insulation that commercial circuit boards have. I've looked
>in the Mouser and Digi-Key catalogs, and can't find anything that looks like
>the type of insulation that would go on top of the traces.

The layer is a solder mask, to keep wave solder machines from coating 
everything.  If you make your blank and hand solder the parts into it,
you could reasonably spray it with something like Krylon clear plastic
spray.  That would make repairs a bit stinky, but maybe not too bad.
Someone else mentioned a solderable mask spray (that would evaporate 
with soldering temperatures).  Since polyurethane magnet wire insulation
does that, perhaps a polyurethane spray would work.  Experiment and let us
know how it works!  (As you probably guessed, solder mask easily
withstands soldering temperatures for a few seconds at least.)

Xref: sparky sci.electronics:13349 rec.audio:10852 alt.folklore.computers:11175
From: edhall@rand.org (Ed Hall)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 26 Jul 92 23:05:49 GMT
Organization: RAND Corporation.

In article <ERIC.92Jul26155404@iceland.telebit.com> eric@telebit.com (Eric Smith) writes:
>44.1 KHz was the sample rate commonly used by PCM encoders and recorders based
>on video gear.  This type of equipment was used for mastering all early CDs.
>44.1 KHz is derived from the horizontal sweep rate.
>
>Unfortunately, in the US, consumer PCM encoders must work with NTSC, which
>runs 0.1% slower than the old B&W scan rates, so the equivalent sample rate
>is 44.056 KHz.

Even the cheapest VCR will have no problem locking onto a signal 0.1%
faster than NTSC.  Consumer video cameras/camcorders can be off by more
than that.

This is good, since sample-rate conversion between 44.1Ks/s and 44.056Ks/s
is pretty tricky and computationally expensive.

		-Ed Hall
		edhall@rand.org
Xref: sparky sci.electronics:13353 comp.sys.ibm.pc.hardware:20353
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
Subject: Re: Airport X-Rays
From: lchiu@animal.gcs.co.nz (Laurence Chiu)
Date: Mon, 27 Jul 1992 01:55:10 GMT
Organization: GCS Limited, Wellington, New Zealand

In article <1992Jul26.115610.20772@mccc.edu> pjh@mccc.edu (Pete Holsberg) writes:
>As a follow-up branch of this topic, let me ask, "how is checked luggage
>examined? -- XRay, metal detector, ???" I put a DAT tape in my checked
>luggage but haven't tried to read it yet.

I can't speak for all airlines but United x-ray checked baggage when you
check in, at the checkin area (at least in SF and LAX). And this is for
international flights. I had a couple of boxes of disks in my baggage and
they came through unscathed so it certainly wasn't magnetic. I also had
a couple of videotapes in the baggage - haven't played them yet but
they should also be unaffected.

Laurence Chiu

Newsgroups: sci.electronics
From: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Subject: Re: Radar Detectors, and Radar Detector Detectors
Keywords: Radar
Reply-To: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Organization: Columbia University
Date: Thu, 23 Jul 1992 20:48:31 GMT

In article <92Jul23.162259edt.176@orasis.vis.toronto.edu> oliverb@vis.toronto.edu (Oliver Bengtsson) writes:
>   Could someone out there please tell me how a radar detector detector
>works? I thought that a radar detector was a passive device, nothing more
>than a receiver tuned into detect a certain radio frequency used in radar
>guns. If this is the case, how can they be detected?  

All receivers work by resonance, and this resonance can be detected with
the appropriate equipment.

The BBC does this in the UK with detector vans.  I remember when I was a kid
and someone told me that in England you need to have a license to own a TV
set, and I said, "Oh gimme a break.  What do they do, drive around in little
vans to see who's paid their TV bill?"  And it wasn't until I went there
for the first time that I learned that that's exactly what they do!

>  Further, is it possible to detect radar detector detectors?

I'm sure it is....maybe we'll soon have combination radar detectors and
radar detector detector detectors.  The cops will, of course, be 
equipped with radar, radar detector detectors, and radar detector detector
detector detectors.


--
Gabe Wiener - Columbia Univ.     "This 'telephone' has too many shortcomings 
gmw1@cunixa.cc.columbia.edu       to be seriously considered as a means of 
N2GPZ in ham radio circles        communication. The device is inherently of
72355,1226 on CI$                 no value to us." -Western Union memo, 1877
From: bender@oobleck (Duke of Canterbury)
Newsgroups: sci.electronics
Subject: Re: LED buffer  (how?) (was 8051 help needed)
Date: 31 Jul 1992 01:08:34 GMT
Organization: SPARK's R US
Reply-To: bender@oobleck.eng.sun.com
NNTP-Posting-Host: oobleck
X-Newsreader: Tin 1.1 PL3

pegasus@csd4.csd.uwm.edu (David R Hucke) writes:
: Thank you all for helping me out with my 8051 question..
: 
: Several said that I would pulling too much current through the port
: pin and I should use a transistor as a buffer...
: 
: WOuld somebody tell me how to do that?  Do I use an NPN or PNP?
: What does the schematic look like?

				+5V
				 ^
				 |
				 |
				 |
				___
				\ / LED
				---
				 |
				 |
				 Z
				 Z 100 ohms
				 Z
				 |
	|			 |
   8051 |	   1K	       b|/c
   port +--------/\/\/\---------|  NPN (2N2222 typ.)
   pin  |			|\e
	|			 |
				 |
				 |
			       -----
				---
				 -

When you set your 8051 port pin HIGH, the LED will illuminate.

: Could somebody explain to me in clear english the theory behind the 
: operation of the transistor being used as a buffer?

In this example, the transistor is used to sink a larger amount of current
than the 8051 port pin can sink or source.  100 ohms for the LED current
limiting resistor may be a bit aggressive, but I like my LED's bright :-).

mike
Newsgroups: sci.electronics
From: fculpepp@norfolk.vak12ed.edu (Fred W. Culpepper)
Subject: Cadmium?
Organization: Virginia's Public Education Network (Norfolk)
Date: Thu, 30 Jul 92 02:04:46 GMT

With our knowledge base constantly expanding along with the list
of dangerous substances, exactly what is the problem associated
with cadmium, or let's discuss a specific problem:

Electronic components manufactured through the 50's and well
into the 60's were cadmium plated for some reason.  With age,
those components are found to be covered with a fine white
dusty material which I assume is Cadmium Oxide or something
similar.  Is this substance dangerous?  How can it be removed
safely?

Fred Culpepper

fculpepp@norfolk.vak12ed.edu
--
From: dang@cserver.plexus.com (Dan Gardner)
Newsgroups: sci.electronics
Subject: Re: "Jacobs Ladder" - How do you make this project???
Date: 30 Jul 92 17:33:56 GMT
Article-I.D.: cserver.dang.712517636
Distribution: usa
Organization: Plexus Corp. -- Neenah Wisconsin

tcmay@netcom.com (Timothy C. May) writes:

>jeff@strobe.ATC.Olivetti.Com (Jeff Lim) writes:
>: 
>:    I would like to make a "Jacobs Ladder" for my sons summer school
>:    project.   Does anyone know how to make one or where to buy parts
>:    to make one??  How about a schematic??   Any mail order houses
>:    out there?    Any info is appreciated.   Thank You!

If you want a quick and dirty Jacob's Ladder, go get yourself a high 
voltage transformer that steps 120v up about 15,000v.  I did this with
with a shoebox sized 15kv transformer and a couple of straightened coat
hangers for Halloween one year.  15kV will need about 1/2 to 3/4 inch of
gap to get started. The arc will travel up the wires and stretch out to 
3 inches or more. Neat stuff!  Good luck. Don't kill yourself; this type
of stuff can be very dangerous around kids.
--
 _____   _____ _________________________
|     ) (     |                         |
|    (   )    | dang@cserver.plexus.com |
|     ) (     |                         |
|    (   )    |                         |
|_____) (_____|_________________________|
      
Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)
Subject: 20W Audio amplifier chip TDA1520 
Distribution: world
Organization: null
Date: Mon, 27 Jul 1992 23:48:10 +0000

I notice that Thompson are advertising the TDA7294, 100W into 8 ohms (180 
into 4). 
Anyone here used this chip?

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
                                
Newsgroups: sci.electronics
From: mpalmer@encore.com (Mike Palmer)
Subject: Re: Radar Detectors, and Radar Detector Detectors
Organization: Encore Computer Corporation
Date: Fri, 24 Jul 1992 17:25:33 GMT

cab@col.hp.com (Chris Best) writes:

>> I'm sure it is....maybe we'll soon have combination radar detectors and
>> radar detector detector detectors.  The cops will, of course, be 
>> equipped with radar, radar detector detectors, and radar detector detector
>> detector detectors.


The military have been playing this game for ages - First there was ECM
(Electronic counter Measures) then ECCM, then ECCCM etc.

I would still like to see a chaff dispenser on the roof of my car hooked
to the radar detector - When a high power pulse comes in that would give
no chance to slow down, out goes the radar confusing chaff.  (A couple
of radar seeking missiles, would be even better!)


Newsgroups: sci.electronics
From: billg@bony1.bony.com (Bill Gripp)
Subject: Re: 25KV (was: SHOCKING STORIES)
Organization: LA&W RR
Date: Wed, 29 Jul 92 15:17:16 GMT

In article <1992Jul28.222944.8819@irisa.fr> saouter@irisa.fr (Saouter Yannick) writes:
>In article <1992Jul23.192145.1@research.ptt.nl>, walvdrk@research.ptt.nl (KEES VAN DER WAL) writes:
>|> In article <1992Jul22.145523.261@bony1.bony.com>, billg@bony1.bony.com (Bill
>|> Gripp) writes: 
>|> 
>|> > natural reaction was to grab that wire so he wouldn't fall.  Only
>|> > problem was that wire provided 11kVAC to drive the electric trains.  He
>|> > said his brother only survived because the path the current took through
>|> > his body did not pass through his heart.
>|> 
>|> This morning there was a story on the BBC-news that a boy survived a 25KV shock 
>|> from an overhead railway line. I didn't catch how he came into contact with the 
>|> line; he's in hospital now.
>|> 
>|> <kees>
>
>Voltage in itself does not mean anything: I've heard of a man having taken without
>unloading it a Wimshurt engines which can produce much more voltage, in fact at least 100
>kV and sometimes up to 1 MV. He did not even fall uncouncious. In the other side, I've
>read that voltage of electrical chair is 7000 V.

Yes this is true, the "fatality" is caused by the current, not the
voltage.  Rest assured, we haven't mastered the technology yet to move a
train with milli-amps.  I'm not 100% sure, but I seem to recall that a
typical current in the catenary is somewhere around 50-100 amps.
From: bender@oobleck (Duke of Canterbury)
Newsgroups: sci.electronics
Subject: Re: Dallas Video on Demand Test
Date: 28 Jul 1992 08:20:47 GMT
Organization: SPARK's R US
Reply-To: bender@oobleck.eng.sun.com
NNTP-Posting-Host: oobleck
X-Newsreader: Tin 1.1 PL3

klopfens@andy.bgsu.edu (Bruce Klopfenstein) writes:
: 
: According to the 13 July 1992 issue of TELEVISION DIGEST,
: USA Video wants to test a video-on-demand service this fall
: "using one of Southwestern Bell's 2 fiber testbed communities
: outside Dallas."  The technology was tested in SW Bell's lab
: in St. Louis in June.  A compressed movie can be delivered to
: the home in 3 1/2 minutes using the "equivalent of less than
: 10 standard video channels for rapid delivery."

How is this possible?  Didn't we learn on the net last month that it is
theoretically impossible to transmit a full motion video signal over
telephone facilities because the SWR would cause the television receiver to
explode into oblivion :-)?

Well, didn't we?

mike
Newsgroups: rec.electronics,sci.electronics
From: marc@r-node.gts.org (Marc Fournier - Sys Admin)
Subject: MPI-100 from ...?  
Organization: R-node Public Access UNIX System (416-249-5366) 24hrs.
Date: Thu, 30 Jul 1992 04:33:59 GMT

Hi...

	How vague can I get, eh? :(  They are the same company
that makes the MPI-50 PLC.

	We are looking at using this for industrial purposes
and I"m looking for information dealing with it. Experiences, etc?

Thanks...

Marc
-- 
Marc G. Fournier    | R-node Public Access Unix running UnixBBS 1.03
Etobicoke, Ontario  | 416-249-5366   24hrs 7 days/week   network email
voice: 249-4230     | shell/feed accounts available   1800+ newsgroups
marc@r-node.gts.org | Telebit T3000/SupraModem2400/Cardinal 2400  FREE
Newsgroups: sci.electronics