HDTenEightyP/NetNews huggingface dataset:
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Newsgroups: sci.electronics
Subject: Re: How can a radar detector bedetected
Date: 22 Nov 1992 00:54:44 GMT
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
NNTP-Posting-Host: skybridge.scl.cwru.edu

Of course the cop can just trigger the instant-on radar, and
see whose brake lights immediately light up.

Low-tech enough for any cop to handle.

--
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: markd@uniwa.uwa.edu.au (Mark Diamond)
Newsgroups: sci.electronics
Subject: Re: Tone frequencies on telephone
Date: 19 Nov 1992 21:36:08 +0800
Organization: The University of Western Australia
NNTP-Posting-Host: uniwa.uwa.edu.au

gt8741b@prism.gatech.edu (Chris Adams) writes:

>Can someone tell me what the frequencies of the buttons on a telephone generate
>and what the dial tone frequency is?  I am trying to build something, and I
>need to recognize a dial tone, and generate button presses.
>--
>Chris Adams                       | "If tin whistles are made of tin,
>Georgia Tech                      |  what do they make foghorns from?"
>Internet: gt8741b@prism.gatech.edu|       --  Lonnie Donegan
>----------------------------------+ 

I don't recall the tone frequencies.  However, they are easily found in
the published ISO, British and Australian standards.  Presumably these,
or the USA equivalent should be easily obtainable.  Basically, each
digit (as well as the * and # functions) are composed of 2 frequencies
sounded together.  All keys in the same Column share the same lower tone
(with the lower tone ascending across columns) ... and similarly for the
rows.




M A R K  R  D I A M O N D | The University of Western Australia | All opinions
markd@uniwa.uwa.edu.au    | WACCRM                              | are my own.
                          | 328 Stirling Highway                | Perhaps some
VOICE: +61 9 3847644      | CLAREMONT  WA  6010                 | of them ought
FAX:   +61 9 3852938      | AUSTRALIA                           | to be yours.
Newsgroups: sci.electronics
From: kbass@gmuvax2.gmu.edu (Ken Bass)
Subject: Re: Cable TV Rules
Organization: George Mason University, Fairfax, Va.
Distribution: na
Date: Thu, 19 Nov 1992 16:07:23 GMT

In article <3977@eastman.UUCP> lsls00@iliad.Kodak.COM (Ilia Levi) writes:
>
>Actually you are not buying the whole spectrum of frequencies. Cable company
>is offering you service with certain conditions attached. If you don't like
>those conditions(more money for the extra extensions) you have a right to
>refuse to buy the service. If you CHOOSE to buy their service, you must, morally
>and legally, abide by their rules. If you don't like their rules, get a dish,
>don't watch TV, etc. This is a free country not only for the consumer, but for
>the business as well.
>-- 
>
>--------------------
>Ilia, levi@kodak.com

To suggest that we have a choice and to be discussing a monopoly is
hypocritical. 

Also, just because I say these are the rules doesnt mean they are. You
do not have the right to take away someones rights that you didnt give
them in the first place.

Thats like me saying, you cannot have free speech, if you buy telephone
service. It is wrong and your rights are protected.

   ---Ken

-- 
Ken Bass (kbass@gmuvax2.gmu.edu)              |   Telecommunications  
George Mason University                       |   Techniques Corp, 
Student, Department of Electrical Engineering |   Software Engineer 
Newsgroups: sci.electronics
From: ajackson@ernie.Princeton.EDU (Andrew William Jackson)
Subject: Re: IC lithography and manufacture.
Originator: news@nimaster
Organization: Princeton University
Date: Mon, 23 Nov 1992 05:32:59 GMT

In article <2931439971.1.p00140@psilink.com> "Gary A. Woodward" <p00140@psilink.com> writes:
>Ihave an idea.  I am sorry but I am not too technical with electronics(I 
>have a degree in econ-probably the best if more economists would find 
>something other to do also:)).  Is there a source that will tell me the 
>basics on micro etching of items such as the lithography that allows IC 
>circuts to be made?  I am looking specifically for 5-20 micrometer 
>resolution. What would the cost of such equipment be-even used obsolete
>equipment would work.  The wafers would not to be clean room quaility.
>Would it be possible to make these micro etched items in my basement?
>I can not discuss now-but after patent pending I will be willing to discuss.
>

Getting a patent on a "new" idea is not so easy.  If you dont even 
know the basics of microlithography, why do you think that you
are the first to think of this idea?

ajackson@ernie.princeton.edu


Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: Re: Possible to upgrade PC from FCC Class B to A?
Organization: Ontario
Date: Mon, 16 Nov 1992 21:34:42 GMT

In article <1992Nov16.192730.23028@cbfsb.cb.att.com> vinlai@cbnewsb.cb.att.com (vincent.lai) writes:
>I posted an article on EMI/RFI a while back and got really good
>feedback, especially from someone who gave me info from ARRL (Thanks,
>btw).  After doing a little research, I found out that my PC was FCC
>Class B, meaning it's supposed to be used in the office.  Guess where
>it is at this moment?  
>
>With this new information, I'm wondering if the methods used to filter
>out EMI/RFI will still work.  That brings up the idea of digging into
>the PC hardware to upgrade its FCC Class from B to A.  First, is it
>possible?  Second, and if so, how to go about it?  Or am I SOL (S--t
>Out of Luck)?  Thank ya ...

Why bother?  I mean, does the FCC actually police that kind of thing?
How many PC's are sold in warehouse and deptartment stores now?  Are
they class A?  Just how does the FCC get involved with the sale of
electronic equipment?  Like, is it illegal to sell something that
doesn't have an FCC Class?  How many mom & pop computer stores are
building pc's from the case up?  

The FCC may have some teeth as far as dealing with your local TV or
radio station, and it may even shut down a pirate, or someone running
a 1000 watt CB rig, but what can they do as far as consumer electronics
(computers) goes?  If someone wants to market a pc, or a limited production
device for lab or research work, do they really (I mean, *really*) have to
worry about FCC hassles?  (UL and CSA stuff is a different thing).
Newsgroups: sci.electronics
From: clewis@ferret.ocunix.on.ca (Chris Lewis)
Subject: Re: 68000 and Cache?
Originator: clewis@bcarh1d7
Keywords: 68000
Organization: fo
Date: Mon, 16 Nov 1992 15:27:37 GMT

In article <1992Nov12.222122.12200@nntp.hut.fi> sakaria@vipunen.hut.fi (Sakari Aaltonen) writes:
>In article <1dnt1fINNk0f@uranium.sto.pdb.sni.de> Josef Moellers <mollers.pad@sni.de> writes:
>>You don't need any provisions for a cache, i.e. none in particular.
>>All You need is a means to temporarily suspend operation of the CPU
>>while You process a cache miss.

>Yeah, well, I do know in a general way how caches operate. What I
>don't know is how they are implemented with a 68000. What kind of
>hardware will do the job, that sort of thing. Are any IC's available
>for the purpose, for example? What do the accelerators use? I've
>never seen one...

Many of the dynamic RAM controller chips can do this.  It's been a while,
so I don't remember the numbers.  This is the same as in the 80?86 community,
so if you can find a 386 with caching (say), you can find out some of the
part numbers.

Should point out, however, that if you're talking about disk caching (or anything
else that requires CPU intervention) that you can't do it without a lot of
grief.  The MC68000 has no way to save memory access state, so cannot be
used to service the cache miss.  The MC68010 and above *do* have this
capability.  (In essence, the 68000 doesn't have instruction restart or
continue)

Back in the old days, if you wanted to do demand paging with a 68000, you
had to put the 68000 into HALT, and have an auxiliary processor wake up,
service the page fault, and unHALT the 68000.  Obviously, you don't
get to timeslice processes during the fault processing...
Newsgroups: sci.electronics
From: bidlack@eecs.umich.edu (Clint Bidlack)
Subject: shock absorption for electronic equipment
Organization: University of Michigan AI Lab
Distribution: sci
Date: Thu, 19 Nov 1992 21:51:27 GMT


I am looking to install three computer systems on board a outdoor
vehicle. I understand from others who have done this that the rough
terrain does wonders for the electronics equipment, ie., chips being
displaced from their seats, hard drive crashing or becoming useless.
My biggest worry is the hard drive going bad:)

So, my question is, does someone have experience with shock absorption
for electronics equipment? Currently we plan to install a PC clone, a
Sun IPX and a VME chassis on board the vehicle, as well as all of the 
power amps, controls equip and sensors.

Any info would be greatly appreciated. Send responses to
bidlack@engin.umich.edu.

Thanks much.

Clint

=============================================================================
Clint R. Bidlack                 | University of Michigan AI Lab
Phone: (313)763-9352             | Room 48, Advanced Technology Bldg.
Internet: bidlack@caen.umich.edu | 1101 Beal Ave., Ann Arbor, MI 48109-2110
=============================================================================

--
=============================================================================
Clint R. Bidlack                 | University of Michigan AI Lab
Phone: (313)763-9352             | Room 48, Advanced Technology Bldg.
Internet: bidlack@caen.umich.edu | 1101 Beal Ave., Ann Arbor, MI 48109-2110
=============================================================================
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: police laser radar
Date: Thu, 19 Nov 1992 00:08:30 GMT
Organization: U of Toronto Zoology

In article <1992Nov17.163243.15574@col.hp.com> dag@col.hp.com (David Geiser) writes:
>> If your source is brighter than the reflection of the officer's source.
>> If they find the system on your car, say it is your garage door opener.
>
>It's not illegal to broadcast IR, yet.

It's legal to broadcast IR... provided it's not done for an illegal purpose.
It *is* illegal to deliberately interfere with law enforcement, by any means
whatsoever; moreover, it's *seriously* illegal -- a criminal record, not
just a speeding ticket.  (And don't expect the police to have a sense of
humor about it.)  Better be prepared to demonstrate your garage-door opener
to the judge's representatives, or to explain your experimental optical
communications system to an engineer.  If they catch you, you may have to.
Your gadget doesn't have to work well, but it has to be real, not just a
line of bull.

I don't know whether the laser speed guns have jammer detectors, but I'd
bet on it -- the newer microwave ones do.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: wjm@utrc.utc.com (Bill)
Subject: Joystick to PC connections
News-Software: VAX/VMS VNEWS 1.41    
Organization: United Technologies Research Center
Date: Mon, 16 Nov 1992 14:48:00 GMT

I'm looking for some technical info on joystick connection to a PC game 
port.  I know the game port pin out, but it is somewhat cryptic as to the 
actual hookup.

What I want to do is use an analog joystick from an old computer system on 
my PC.

I know, joysticks are cheap, why bother.  Well, I like this joystick 
layout, plus, being a hardware hacker, I can't resist.

The joystick I want to use contains 2 potentiometers and 2 pushbuttons.
How should they be connected to the game port?

Thanks,
+ ><> + ><> + ><> + ><> + ><> + ><> + ><> + ><> + ><> + ><> +
+ Bill Mazeika   WJM@UTRC.UTC.COM                           +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ God's got an army, not afraid to fight.                   +
+ Soldiers of the cross, and children of the light.         +
+ Warriors of righteousness, with healing in their hands.   +
+ God's got an army, marchin through the land.     -Carman  +
+ <>< + <>< + <>< + <>< + <>< + <>< + <>< + <>< + <>< + <>< +
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: Death of remote controls
Date: Sat, 21 Nov 92 13:32:43 GMT
Reply-To: paula@nlbbs.UUCP
Distribution: world
Organization: The Electronics Workbench

        At Maine Public Broadcasting we had nylon carpet and LOTS of
        static charge. Not good for people or equipment.

        In a dull moment, I took a few 1 meg resistors, curled and
        soldered the ends to eliminate sharp points and gave them to
        anyone who was interested.

        When we approached a known "zap point" we would pull our little
        gizmos out and, holding one end of the resistor, touch the
        object.

        The charge is dissipated painlessly. Guests in the studios would
        get this weird look on their face when offered one . . .

        * * * * * * * * * * * * * *  * * * * * * * * * * * * * * *
	*   Paula Stockholm              paula@nlbbs.UUCP        *
	*  Cumberland, Maine          !nlbbs!paula@uunet.uu.net  *
	* * *  * * * * * * * * * * * * * * * * * * * * * * * * * * 
        



Newsgroups: sci.electronics
From: doherty@melpar (Kevin Doherty)
Subject: Re: How can a radar detector bedetected?
Organization: E-Systems, Melpar Division
Date: Fri, 20 Nov 1992 14:19:29 GMT

  The problem is 'LO reradiation'.  Most sensitive receivers, right off the
antenna, do their first downconversion operation.  Thus you have an antenna
going to one mixer port, your LO going to another, and the first IF coming out
the third.
  Unfortunately, there's some coupling between ports on even the best mixers,
and that's what's being detected-some LO is going right out the antenna.


  Now, what I want to see is some enterprising enterpreneur churn out millions
of 'radar detector detector jammers'-just an LO at the right frequency hooked
up to a micro antenna.  The size of an ice cube, powered for weeks off a small
battery, and under $1.00 to make: everyone would have one.  And all of 'em would
look like a radar detector to the detector detectors.

  Radar detectors = countermeasure; detector detector = counter-countermeasure;
guess that makes the jammer a counter-counter-countermeasure.
From: pauls@trsvax.tandy.com
Date: 18 Nov 92 10:22 CST
Newsgroups: sci.electronics
Subject: Re: Cross-reference of a Transistor
Message-ID: <288200028@trsvax>
Nf-ID: #R:amd.com:28302:trsvax:288200028:000:100
Nf-From: trsvax.tandy.com!pauls    Nov 18 10:22:00 1992


The 8050 is probably the date code, (50th week of 1980) but I cant seem to
locate the rest of it.



Newsgroups: sci.electronics
From: mtarrant@snuffy.wa.atk.com (Mike Tarrant)
Subject: Re: police laser radar
Organization: Alliant TechSystems Inc.
Date: Fri, 20 Nov 1992 16:39:47 GMT

In article <Bxx74o.2vo@immd4.informatik.uni-erlangen.de> orscholz@immd4.informatik.uni-erlangen.de (Oliver Scholz (Turo - Backstage)) writes:
>Ken Wilkens <wilkens%nmr@venus.ycc.yale.edu> writes:
>
>>Well I was thinking about putting laser diodes on the front of my car
>>also soon as I found what wavelength the operate at. I don't think it
>>would take much power to foul the lidar as it uses reflected power which
>>should be alot less than you would be broadcasting. As for the legal
>Exactly. That's why you don't need lasers. Remember, if you use a laser, you
>have to aim directly at the speed gun to jam it effectively. Why not use
>IR-LEDs? Their light is much more diffuse, and as you stated, the LEDs
>should be much 'brighter' than the reflection from your car.
>
That probably wouldn't be effective.  I'm pretty sure the laser is
going to be modulated to allow the receiver to discriminate between
the actual reflection, and noise in the environment.  You'd have to
modulate your LED array at the same frequency.  Things get more
complicated if the frequency changes (i.e. a chirp).


Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: Are TV's interlaced? Why no flicker?
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Distribution: na
Date: Mon, 16 Nov 1992 03:18:25 GMT

jdc3538@ultb.isc.rit.edu (J.D. Cronin) writes:
>Why don't ordinary TV sets flicker?  A friend told me that standard
>NTSC video signals are interlaced.  That doesn't make sense, since
>the picture should flicker enough to be unwatchable.  

     They do.  They are.  It does.  It is.  Get closer to the screen
and look.  Try still-framing a VCR.

					John Nagle
Newsgroups: sci.electronics
From: kdc5072@ultb.isc.rit.edu (K.D. Colagio)
Subject: looking for...
Followup-To: sender
Originator: kdc5072@ultb
Organization: Rochester Institute of Technology
Date: Fri, 20 Nov 1992 04:19:54 GMT

I am looking for the name and/or address and/or phone number for a place to
get small (preferably) electronic gyros.  This is going to be for a nead
movement sensor, to give you an idea of the size/weight I am looking for.

Any help is greatly appreciated.

    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    =   Kevin Colagio...student at large - Bear code?  You think I   -
    -                aka                 -   know what that is???    =
    =       KDC5072@ultb.isc.rit.edu     -    B2/4 w g++ K s- h+ r   -
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Newsgroups: sci.electronics
From: jhwhit01@ulkyvx.louisville.edu
Subject: Re: Logic Addition
Date: Mon, 16 Nov 1992 05:49:06 GMT
Organization: University of Louisville

In article <#-t1l#n@rpi.edu>, wilusd@cary115.its.rpi.edu (David John Wilusz) writes:
> 
> 	Perhaps sci.electronics is not the place for this, but where is?  Could someone give me the configuration of gates that allows binary numbers to be correctly added?
> 	Thanks for any help...
> 
> 	Dave
> 
  
I have seen the other responses, which do answer your question.  Thus, I will
give you an alternative.  Simply program an EPROM to give you addition.  The
values to be added are combined on the address bus of the EPROM, and the value
read at that address is the sum.  You might think this is a waste of good
memory, but it is a rather simple concept that is sometimes best and is probably
often overlooked.
 
If you need very fast addition, PROM is probably not a good idea.
 
Jeff White        jhwhit01@ulkyvx.louisville.edu
Organization: Queen's University at Kingston
Date: Fri, 20 Nov 1992 23:20:35 EST
From: <LAMC@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Interface for V-I characteristics

Is there a commercially availiable interface to PC for measuring the V-I
characteristic of a non-linear device? If so, how much would such an interface
cost? I am also wondering whether it is easy to build such an interface?
Specifically, I would like to generate the V-I characteristic of solar cells.
Since I have about 1000 cells, that's why I don't want to test them manually.
Newsgroups: sci.electronics
From: csmith@plains.NoDak.edu (Carl Smith)
Subject: Re: Possible to upgrade PC from FCC Class B to A?
Date: Tue, 17 Nov 1992 06:37:15 GMT
Organization: North Dakota Higher Education Computing Network

Class B is the better of class B and A. (B requires less emissions than A.)

I quote, without permission :), from _Noise Reduction Techniques in
Electronic Systems, Second Edition_ by Henry W. Ott:

"  Class A: A computing device that is marketed for use in a commercial,
            industrial, or business environment.

   Class B: A computing device that is marketed for use in a residential
            environment, notwithstanding its use in a commercial,
            industrial, or business environment.  "

In short, Class a is not for home use, due to the high amount of emmissions
that are allowed.  Class B requires lower emissions, for home use, but that
doesn't mean that a class B machine can't be used in a business...
From: sl@nessie.mcc.ac.uk (Stuart Lea)
Newsgroups: sci.electronics
Subject: Starburst Displays --------- How can I drive one ?
Date: 14 Nov 92 14:57:29 GMT
Organization: Manchester Computing Centre


I want to be able to drive 12 starburst displays of the 14 or 16 segment 

variety.

Is there a device that will do this ?  I know that there is a device that

will drive a fluorescent display, but not an LED one ?

-- 
+Stuart Lea---Tel:061 200 4809--Fax:061 200 4019---UMIST University-----------+
| JANET   :   sl@uk.ac.mcc.nessie                  B22, Main Bldg., PO Box 88 |
| INTERNET:   sl%nessie.mcc.ac.uk                  Manchester, UK M60 1QD     |
|                 "Weather is here, wish you were beautiful"                  |
From: markey@flash.ATC.Olivetti.Com (Tim Markey)
Newsgroups: sci.electronics
Subject: bi-directional parallel port
Date: 16 Nov 92 18:16:39 GMT


    If you wan't to transfer bi-directionally on a parallel port here
    is a scheme which will work.  First you need to modify a cable to
    cross the strobe and the ack line.  These are lines 1 and 10.  The
    receiving PC should get an interupt for each byte sent from the 
    transmitting PC.  An interupt will be generated if the IRQE bit (4)
    is set in the Control port.  The ACK line is usually used by a printer
    acknowledge that it has received a data byte.  This can instead be used
    by the transmitting PC to tell the receiving PC that a byte is ready
    to be read.  The receiving PC should have an interupt handler installed 
    which will fetch the data and store it once the interupt is generated.
    
    The ACK line is not directly controllable via a regular PC port, but
    the strobe line is.  If the ACK line is crossed with the strobe both
    ways then you have a method of transfering both ways.  

    The interupt handler should be installed in the interupt table. The
    direction bit should be set correctly (0 = Write, 1=Read) in the
    control port.  The ports IRQ should be unmasked via the PIC mask
    register so that interupts may come in.  Also there may be a register
    which needs to be set to enable bi-directionality on the parallel port
    This is different depending on whether you have an AT, microchannel,
    or and EISA machine.  

    Hope this helps, 

    Tim Markey

Newsgroups: sci.electronics
From: erica@wariat.org (Lady of the BitMode)
Subject: Digital Scanners
Organization: Akademia Pana Kleksa, Public Access Uni* Site
Distribution: usa
Date: Fri, 20 Nov 1992 22:20:22 GMT


Hello ppl. I wanted to buy a low scanner to digitize images for. It must
have good quality picture; ie, very tight picture, photo kind of finish.
I went to micro-center here in cleveland and their $1400.00 flatbed
scanner was not good enough, it had 300 dpi. They told me that I needed an
more expensive scanner for what I want to do. THus, I think I had better build
it myself and save a bundle Hence my question. Does anybody know, or can
direct me to information, how build a very high resulution digitizer? I know
how to lay out circuit boards and solder, All I need are the parts and the 
schematic.


Thankyou,


Erica A. Ramsey, Esquire