HDTenEightyP/NetNews huggingface dataset:
From: schmidt@auvax1.adelphi.edu
Subject: Re: Magnetic tape developer
Organization: Adelphi University, Garden City NY
Date: Thu, 30 Jul 1992 05:15:08 GMT

In article <1992Jul29.224920.17143@morrow.stanford.edu>, kai@pangea.Stanford.EDU (Kai Lanz) writes:
> Bob Butler (butler@vax.sonoma.edu) asked about a magnetic-tape developer
> called Kyread...
> 
> The stuff I used to use was called MAG VIEW magnetic tape track developer.
> It was (is?) made by Nortronics Co. Inc. of Minneapolis. It contains
> (surprise!) iron powder and Freon (tm).
> 
> It worked great; unfortunately the propellant's used up in the little can
> I have, and I don't know who distributes this stuff or if Nortronics still
> exists. Anybody?

They still exist, are a major producer of magnetic tape heads.

Try NORTRONICS COMPANY, Inc.
    8101 Tenth Avenue North
    Minneapolis, Minnesota 55427

    612 545-0401

This catalog is 9 years old, so the phone # could have changed, but they are
still around.  They exhibit at all the broadcast shows.  I don't know if they
still make "mag view"  I thought that stuff went out with 2" quad video tape.

John

PS Just looked in the catalog I got the address from.  It lists "PF-601 Magview
(r) tape developer, and shows a 4 oz. spray can.  Of course with the
restrictions on Freon now, ???

John

> 
> I also used to have a little disk-shaped magnetic viewer which could be
> used to inspect mag tape, but the suspension liquid in the thing dried out
> ages ago. It was made by 3M.
> 
> --- Kai Lanz         kai@pangea.stanford.edu
> 
-- 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
John H. Schmidt, P.E.              |Internet: schmidt@auvax1.adelphi.edu
Technical Director, WBAU           |Phone--Days     (212)456-4218
Adelphi University                 |       Evenings (516)877-6400
Garden City, New York 11530        |Fax-------------(212)456-2424
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Newsgroups: sci.electronics,rec.audio,alt.folklore.urban
From: tech@cs.ucf.edu (Tony Travaglini)
Subject: Re: CDs, Pens and Blue Lasers.
Keywords: Make MILLION$ with ME.
Organization: University of Central Florida, Orlando
Date: Thu, 30 Jul 1992 16:25:07 GMT

In article <1992Jul30.055802.9318@news.columbia.edu> lasner@watsun.cc.columbia.edu (Charles Lasner) writes:
>In article <11477@optilink.UUCP> manley@optilink.UUCP (Dave Manley) writes:
>
>>+ The SONIC CLARITY(tm) CORP., LTD. is an equal opportunity /  +
>>+ affirmative action employer. M/F/H/V/HVAC                    +
>
>Are you saying that your company gives affirmative action bias to High
>Voltage Alternating Current machines over humans?
>
Oh come on, he obviously gives aa bias to Heating, Ventilation, and
Air Conditioning machines. Give the guy a break.

Tony Travaglini
tech@cs.ucf.edu
From: deaven@physics.Berkeley.EDU (David Deaven)
Newsgroups: sci.electronics
Subject: Re: Shocking stories
Date: 21 Jul 1992 22:14:59 GMT
Organization: University of California, Berkeley
NNTP-Posting-Host: physics.berkeley.edu

> -=> Nicholas J Feliccia spoke of "Shocking stories" <=-
> 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

One summer I was just finishing mowing our (slightly wet) lawn, with a
lawn mower that had lost the spark plug boot. I wondered just how hot
the crankcase was, and licked my fingers, intending to momentarily
touch them to the case. The mower was running, and I absent-mindedly
grabbed the end of the spark plug (it was very hot and my brain must
not have been running at 100%). 

When I woke up, I was flat on my back about seven feet from the mower,
which was still running. I had a very bad headache and my arm was very
sore. My fingers were burned, but not too badly.

-- 
David Deaven (deaven@physics.berkeley.edu)
Physics Department
University of California at Berkeley
Berkeley, CA 94720
Newsgroups: sci.electronics
From: tcs@ll.mit.edu (Tom Sefranek)
Subject: Re: Radar detectors
Reply-To: tcs@ll.mit.edu (Tom Sefranek)
Organization: "Group	47"
Date: Wed, 29 Jul 92 17:42:59 GMT
In: article <bs5e8t.1na@wang.com>, dbushong@wang.com (Dave Bushong) writes:
|>: 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)


Dave,
	Ask a ham, there are severaly at Wang.  Your posting linking the HAM
band 10 ghz with radar is BOGUS!!!  We don't do pulse mode, we don't do 10.525G.
And we certainly wouldn't be involved with defeating the police radar.

Come join us, don't guess!

Tom
-- 
--------------------------------------------------------------------------------
   /-/-/-/-/             |                 VE Sessions every Sunday 15:00 EST
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       |                 x         |       Second & Fourth Mondays of the month.
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      /                ||x\      /   \     First, Third, (Fifth) Mondays.
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Xref: sparky sci.electronics:13365 rec.audio:10864 alt.folklore.computers:11204
From: tim@rri.UUCP (Tim Buck)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 27 Jul 92 12:35:05 GMT
Followup-To: sci.electronics
Organization: Recognition Research Inc., Blacksburg, VA

In article <1992Jul24.203724.22543@rchland.ibm.com> jsimon@rchland.vnet.ibm.com (Gerald Simon) writes:
> 
>This may sound stupid but, when I look at the back side of a CD (the side
>the music is on), the light reflected back in the first part of the CD 
>(usually less than 1/4 inch from the outside) differs from the light reflected
>back from the rest of the CD.  I've always assumed that's the portion of the CD 
>where the music is recorded.  If that assumption is correct, than there is 
>a LOT of space left over for additional music over the rest of the CD....How 
>wrong am I?
>
CDs are recorded from the inside out -- the small portion on the outer edge
where the reflected light differs is the empty space.
Newsgroups: sci.electronics
From: gerry@bluemoon.rn.com (Gerard M. Foley)
Subject: Re: No Code Technitian License (attn: HAM radio)
Organization: Blue Moon BBS ((614) 868-998[024])
Date: Mon, 27 Jul 92 21:27:08 EDT

charles@zip.eecs.umich.edu (Charles Jacob Cohen) writes:

> Does anyone know of a phone number (in the US, but preferably in 
> Michigan) for the Amature Radio Relay League or the equivalent
> so I can figure out how to apply for a No Code Technition License?
> Please post here or e-mail me at the above address 
> (charles@caen.engin.umich.edu).  Thanks! - Chuck
> 
> 
> -- 
> "I do not feel obliged to believe that same God who endowed us with sense,
> reason, and intellect, had intended for us to forgo their use." - Galileo
> "I'm an engineer, not a dictionary!" - Me

Try Dale Williams WA8EFK, 291 Outer Dr., Dundee MI 48131
phone 313-529-3232

 This is from
     gerry@bluemoon.rn.com
who doesn't have his (or her) own obnoxious signature yet
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
News-Software: VAX/VMS VNEWS 1.41    
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
Date: Mon, 27 Jul 1992 21:01:00 GMT

In article <1992Jul27.182147.1332@portal.vpharm.com>, dap@portal.vpharm.com (David A. Pearlman) writes...
>This isn't the first time Polygram has taken an offbeat road to promote
>their artists. Around 1980, they issued a couple of promo-only samplers
>(vinyl LP's) that played from the inside-out (more recently, Capitol took
>the same route and issued a 12" EP by the group School of Fish that played
>from the inside out). 

	Anybody remember who the group was that came out with a 3-sided LP?
	I remember the technology, but can't remember who did it.

	Side one was normal, other side contained 2 parallel spiral tracks.
	Depending on just where you sat the needle, you got two different
	tunes.

   Frank R. Borger - Physicist    __       Internet:  Frank@rover.uchicago.edu
Michael Reese - Univ. of Chicago |___      Phone : 312-791-8075 fax : 567-7455
  Center for Radiation Therapy   | |_) _   Get all the fools on your side and
    2929 South Ellis Avenue        | \|_)  you can be elected to anything.
    Chicago, Illinois 60616           |_)  Frank Dane
Newsgroups: sci.electronics
From: markz@ssc.wa.com (Mark Zenier)
Subject: Re: 7 seg. Hex display driver IC?
Organization: SSC, Inc., Seattle, WA
Distribution: na
Date: Sat, 25 Jul 1992 19:54:51 GMT

In article <55066@mentor.cc.purdue.edu> falatic@mentor.cc.purdue.edu (MacGyver) writes:
>	Hi! I am looking for a chip to convert BCD (actually, straight 4 bit 
>binary) to drive a 7 segment LED display, and to display 10d to 15d in
>Hexadecimal (A-F). I need something LIKE a 7447 driver, but that one does not 
>treat 10d-15d the way I need. 

This one is getting to be a FAQ.  

The Fairchild 9368, 9369, 9370 are (old) ttl drivers with various forms
of output.  The Motorola Mc14495-1 is a cmos part.

Both are either old or obscure (low volume) parts.  It would be
cheaper to program a GAL/PAL or small EPROM and stick a uln2003 on the
back.

Mark Zenier  markz@ssc.wa.com  

Newsgroups: sci.electronics
From: simoni@strat.Stanford.EDU (Richard Simoni)
Subject: source for cables with 7-pin mini-DIN connectors?
Reply-To: simoni@strat.stanford.edu
Organization: Stanford University
Date: Sun, 26 Jul 92 06:23:18 GMT


Does anyone know where I can buy a prefab cable with a 7-pin mini-DIN
connector on one end (I don't care what's on the other end)?  I've seen the
connectors themselves at Halted and in the Digi-Key catalog, but I haven't
seen any pre-made cables.

Thanks,

Rich Simoni
simoni@strat.stanford.edu
Xref: sparky sci.electronics:13256 comp.sys.ibm.pc.hardware:20236
From: dlee@oasys.dt.navy.mil (David Lee)
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
Subject: Re: Airport X-Rays
Date: 24 Jul 92 18:46:25 GMT
Reply-To: dlee@oasys.dt.navy.mil (David Lee)
Followup-To: sci.electronics
Organization: Carderock Division, NSWC, Bethesda, MD

In comp.sys.ibm.pc.hardware, dvsg0223@uxa.cso.uiuc.edu (David Salamon) writes:
>smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:

.>The X-rays themselves won't do any damage, unless you're carrying something
.>like 1000ASA photographic film, but they use pretty hefty electromagnets
.>to focus the beam, so I never trust floppies or tapes in them, just in case.

>Just a physics point here, but electromagnets will not focus ANY
>electromagnetic wave, including X-rays.  Remember superposition of fields?
>People have been trying to focus X-rays for many years without much success.
>Virtually all X-ray machines just use incoherent, unfocussed X-rays.

>If there are magnets in those X-ray machines, they are most likely in the
>motors running the conveyer belt.


I think it would be smart to avoid any magnetic fields, either generated
by permament magnets or electromagnets,.i.e. motors,..etc.  Data on
floppy or hard disk is of a magnetic nature; and any magnetic field
can, erase if strong enough, or distort so that the pc cannot recover
the data.. PC users have been cautioned constantly about leaving floppy
disk by telephones and on top of monitors.. It might not happen, but it
could.. So, why take the risk??? It's amazing where you can find magnetic
fields in an office or home environment!!!

Fogging of photographic film is another matter and caused by high energy
particles (X-rays,..etc.) and not by magnetic fields..
.
.
.
..
Newsgroups: sci.electronics
From: covingc@ee.tamu.edu (Salvador Trousertrout)
Subject: Sick Dead Digital Delay          
Summary: Deltalab ADM1030 (Effectron III)
Organization: Texas A&M University
Date: Wed, 22 Jul 1992 08:59:51 GMT

I have a rack mount digital delay unit that doesn't repond to two of its
knobs.  This particular model is about five years old, and programmable in
a limited sort of way.  There is no microprocessor, and the analog control
signals are mux'ed and fed to one ADC (at least it looks that way).  

Anyway, what I'd like to know is this:

Does anyone out there have one of these units, or know anything about it?
Does anyone know if Deltalab is still around in some form.  The info I have
is:
	Deltalab Research Inc
	19 Alpha Road
	Chelmsford MA 018xx

But the directory assistance people had no listing of these people, and I
haven't seen an ad for their stuff in years.

Thanks in advance,
Eric Covington
From: jkelly@oodis01.af.mil (Jerry Kelly)
Newsgroups: sci.electronics
Subject: Color LCDs with VGA Quality
Date: 30 Jul 92 15:08:54 GMT
Organization: Hill AFB, Utah

Do any of you know where I can get information on Color LCDs?
I need a large color LCD display hopefully with VGA quality.
Does such a display exist?

jerry kelly
jkelly@oodis01.af.mil
From: whb@castle.ed.ac.uk (H Bruce)
Newsgroups: sci.electronics
Subject: What is an 83C584 ?
Date: 28 Jul 92 13:56:29 GMT
Distribution: sci
Organization: Dept. Electrical Engineering, Edinburgh University, Scotland, UK.

I assume the above mentioned device is an 8051 based micro-controller.
What does it do ?

Thanks,


Henry Bruce
Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: Cable, Stereo, and VCR Questions [correction]
Keywords: Cable TV Stereo VCR
Organization: San Diego State University
Distribution: usa
Date: Wed, 29 Jul 1992 15:01:21 GMT

In article <massoud.20@chemteca.sdsu.edu> massoud@chemteca.sdsu.edu (Massoud Ajami) writes:

>In article <1992Jul27.133817.11872@lonex.rl.af.mil> Brian R. O'Hern (BRO'Hern) writes:


>> I have three questions:

>>1.  I have a lot of RG-58C (50 ohms) and was thinking of using it to 
>>connect my Marantz 200W amp to a pair of Klipsh Heresy speakers.
>>Are my calculations showing that nearly 86% of the signal would be
>>reflected back from the 8 ohm load?  So, not only "no" but "hell no"
>>I shouldn't use coax to drive my speakers? 
>>  However, my instinctive feelings tell me that at because the line
>>is not infinite (transmission line theory), the connection is
>>analyzed as a RC circuit showing the characteristic impedence of the
>>line is close to the load value so reflection isn't a problem.  Also,
>>at 30pF a foot, an audio signal would hardly notice.  In fact, it
>>seems connections using coax would be better than a zipcord (~150
>>ohms) or even a twisted pair and much less noisy than both?

>>1a. Side Ques: I heard that the "Heresy" name came about because its
>>design (Conventional paper cone) is not the standard (does not
>>follow the Klipsh design doctrine).  Any truth to this?

>>2. Is there a FAQ list on VCR problems?  It seems that everyday there
>>is at least one question about VCRs... speaking of which...  I have
>>a RCA that stops a couple seconds after pushing play no matter where
>>you are on the tape. 

>>3. I have a couple of coax splitters that I acquired in college from 
>>my cable connection.  I would like to use them to split an antenna
>>signal (one to TV one to FM stereo).  Is there any truth to the 
>>rumor that the splitters filter out high UHF?  I.E. I won't get
>>channel 68 (~795MHz) through it.

>>Thank you for any comments.


>>BRO'HERN
>>STD DISCLAIM APPLIES ('disClaim dat I make is no lie...)
>>This medium is subject to monitoring. Use of this medium constitutes
>>consent to such monitoring.

>If the length of your speaker wire was longer than 2.5 kilometer, then 
>you can use transmission line theory. 2 E8(signal velocity)/20kHz.=10000 
>meter. Rule: if the propagation delay was [less] more than 1/4 of rise time
                                           ^^^^^^ 
>of the signal (@ max. frequency), then the medium acts as a transmission 
>line.

>3- Some cheap splitters do the filtering by means of higher insertion loss
>at higher frequencies, but still you can get ch. 68.
Newsgroups: sci.electronics
From: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Subject: Re: Radar Detectors, and Radar Detector Detectors and TVs
Reply-To: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Organization: Columbia University
Date: Fri, 24 Jul 1992 06:13:19 GMT

In article <1992Jul24.045805.8598@sifon.cc.mcgill.ca> MrEd@GreenAcres writes:
>:
>> 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!
>> 
>yes, but they don't just drive round aimlessly.

Are the vans marked?  Do they have visible antennas?

>BTW can they differentiate between black & white and colour sets ? - a b&w  
>licence used to cost a lot less than a colour one, and I'm curious as to  
>whether buying a b&w licence would be enough to keep them off your back

You *can* detect the difference between b&w and color, but I don't know
if they'd invest in the hardware necessary to do that.

What are the penalties for operating a TV without a license?


--
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: JDurand@cup.portal.com (Gerald Joseph Durand)
Newsgroups: sci.electronics
Subject: Remote Control Information Needed
Date: Tue, 21 Jul 92 19:52:14 PDT
Organization: The Portal System (TM)
Distribution: usa

I'm having trouble finding the manufacturer of the following chips:
	PT2262
	PT2272-M4
The first chip is an RF remote control transmitter and the second is the
receiver.  They are in a system made in Korea but the importer would like me
to make an improved system and build it here in California.  The Korean
company isn't any help, they just keep raising the price.

Before you ask, there are no other markings/logos on the chips, other than a
date code (8951 & 9105).

Thanks for any help you can give us.

Jerry Durand
Durand Interstellar, Inc.
219 Oak Wood Way
Los Gatos, CA  95032-2523
tel:  408 356-3886 (day)
fax:  408 356-4659
net:  jdurand@cup.portal.com
Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)
Subject: Radar Detectors, and Radar Detector Detectors 
Distribution: world
Organization: null
Date: Fri, 24 Jul 1992 20:34:39 +0000

> 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!
> 
In this day and age of computers what would you do if 98% or so of households 
owned tvs?

Whichever way you look at it, countries are large, resources are  scarce,  so 
psychological  warfare  is  a  cheap  option.  

Why  make  these things highly visible? Why have ones with rubber aerials and 
without installed equipment? Why advertise that your area is being visited?

The police over here advertise where they _have_ used radar and I have never 
seen them revisit an area while the signs are present.

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
                                
Newsgroups: sci.electronics
From: tmkk@uiuc.edu (Khan)
Subject: Re: Life after CDs
Organization: University of Illinois at Urbana
Date: Tue, 28 Jul 1992 16:12:25 GMT


In article <1992Jul27.212455.18334@ole.cdac.com> ssave@ole.cdac.com (Shailendra Save) writes:
>>
>Rob>A CD stores music from the inside to the outside ! Thus you are wrong.
>Rob>This is why 3" CD's work - the player doesn't care that an unused piece
>Rob>of plastic is missing, the music is on the inner circle.
>
>   The dots are spaced out more as you go to the outer edge of the disc, since
>the radial speed increases as you go from inside to the outside. I wish they could
>decrease the speed of the disc as the laser pickup reaches the outside of the disc, 
>and store more stuff on it.  What do you think?

I think your wish has come true. ;-)

From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 24 Jul 1992 19:17:02 GMT
Subject: Re: Green Layer on Circuit Boards?
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics


The "layer of green insulation" that you refer to is probably a layer of
solder resist, which is applied via a photomask process (much the same
way the rest of the board is made), and whose purpose in life is to keep
solder off the traces (expcet for the pads, which aren't covered) when the
board is soldered via a wave-solder machine.  While it isn't conductive,
it is not really intended to be an insulator - at least, that is not its
chief benefit.

If you really wanted to insulate the bottom of a PC board, why not cover it
with a sheet of plastic (perhaps even some heavy-gauge self-stick Mylar)
or use one of the "dip" type encapsulating materials?


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Newsgroups: sci.electronics