HDTenEightyP/NetNews huggingface dataset:
From: np4@prism.gatech.EDU (Nick Pomponio)
Newsgroups: sci.electronics
Subject: VCR Recording Problems
Date: 3 Jan 93 19:59:00 GMT
Organization: Georgia Institute of Technology

I have a Panasonic 4-head VCR that is about 8 years old.  It is a "portable"
(read "luggable") unit that can record from a separate camera. Lately, any
time I record from the camera, the image is "noisy" when played back - it
looks like the tracking needs to be adjusted, but doing so doesn't help.
Prerecorded videos work just fine. Any help in diagnosing the cause of this
problem would be greatly appreciated.

-- 
POMPONIO,NICHOLAS A
Georgia Institute of Technology, Atlanta Georgia, 30332
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!np4
Internet: np4@prism.gatech.edu
Newsgroups: sci.electronics
From: makovsky@scsuc.ctstateu.edu (MAKOFSKY,STEVEN)
Subject: Digital Design/Schematic CAD?
News-Software: VAX/VMS VNEWS 1.41    
Organization: Southern Connecticut State University - Computer Center
Date: Wed, 30 Dec 1992 22:12:00 GMT


Does anyone know of any good digital design cad software? Im in the process
of building a fairly complex system, and could use one that does some
sort of testing run of the circuit aswell. Anyone know of any?
.

Newsgroups: sci.electronics
From: jimbo@socrates.umd.edu (Jim Bogard)
Subject: How would you detect lack of a square wave?
Organization: University of Maryland University College
Date: Sat, 2 Jan 1993 17:23:32 GMT

What's the best way to detect the presence/lack of a square wave?
I'm trying to build a 'valid video present' indicator, and I have
some chip I got from DIGI-KEY (number not handy) which strips
horiz/vert sync and provides them seperately.  Now I'm wrestling
with the problem of getting a TTL out from the mess indicating 
what's going on.  Anybody got any ideas?  Or is there perhaps a 
chip which will do this for me and I'm being stupid?

Thanks much.

J-.

-- 
Jim Bogard  (jimbo@socrates.umd.edu)
                                            "Implement now, tweak later."
Tech at large / gigging daemon
Newsgroups: sci.electronics
Subject: rotary encoders
From: srgxnbs@grace.cri.nz
Date: Mon, 21 Dec 92 22:55:26 GMT
Organization: Industrial Research Ltd., New Zealand.
NNTP-Posting-Host: grv.grace.cri.nz

Thanks to all those who have responded so far, I'd like to clarify my
needs a little.

The advantage of the Grey code is that there is only one bit change
/transition per step of resolution so there is no ambiguity during
the transition stage as would exist with straight binary coded
systems.

The advantage of an absolute encoder system over a relative system
is that the encoder does not have to be zero'd after a power cut etc.
This would be a problem with any system which must recover from a 
power cut etc and must know exactly where it is at when power is 
restored such as a sequencer. Another example is a wind direction 
indicator which will nmot conveniently rotate on demand.

The disadvantage of absolute systems is the number of sensors and the
complexity of the encoding disk.

I've developed what I think is an alternative which has a much simpler
disk, and I want to do some comparisons with a grey-coded system. To 
do this I need to generate some grey code sequences for given angular
resolutions - remember the last code must run into the first (cyclic)

I'd also be interested in _any_ other absolute code methods around,
I've never found any in 18 years of electronics :)

Thanks again for the responses

regards
Bruce
Xref: sparky sci.electronics:21472 sci.energy:6408 rec.autos:30407
From: pngai@adobe.com (Phil Ngai)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 23 Dec 92 08:18:36 GMT
Organization: Adobe Systems Incorporated

In article <1992Dec22.204130.18133@enterprise.rdd.lmsc.lockheed.com> () writes:
>Conservation of energy exactly, where do you think you get the energy to 
>turn a carbon carbon fly wheel into cotton candy from?  Before you start
>flaming at others for not doing the math, do it yourself.

Goodness, an anonymous english major posts. Why don't you think about
this: suppose I have a torch fueled by 10 gallons of gasoline. Do you
believe I could vaporize your "carbon carbon" fly wheel? How would
you compare that to the energy required to merely shred the material?

-- 
My opinions are my own.
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: New (to me) laser-beam pickup application
Date: 3 Jan 1993 22:20:46 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <72811@cup.portal.com> Chris_F_Chiesa@cup.portal.com writes:
>By now we all (hopefully) know that lasers are used to read signals from
>CDs and videodiscs, but last weekend while visiting friends over Christmas
>I heard of a new application for the same (or similar) technology: reading
>good ol' vinyl records by contactless laser pickup.  Has anyone here heard
>of this, and can anyone provide any details on HOW it is being done?  This
>is one of those ideas that, to me, seems obvious in retrospect, and "it's
>a wonder nobody thought of it sooner."

You are thinking of the Finial laser turntable.  It was really a bad idea,
since any little imperfection in the groove wall would show up as a tick
or a pop.  While it did do a very good job of playing back records in 
good shape, it would bring out a lot more surface noise than conventional
playback, and it had great difficulties tracking warped recordings, or
records with an off-center hole.  Finial sold about twenty of the machines
at $15,000 each, before going bankrupt.

There is a small Japanese company which has taken over the design, and is
making the laser turntables on a one-off basis for archivists.  They are
significantly more than $15,000, and except for being able to salvage certain
types of damage, they don't do half as good a job as a conventional pickup.

Save your money and buy a Benz-Micro cartridge and an SME arm instead.
That'll put you back a few thousand bucks less and you might even have
enough left over for a nice turntable.
--scott
Newsgroups: sci.electronics
From: marcm@marcm.mentorg.com (Marc Minato)
Subject: Re: Iron-On PCB transfers
Date: Tue, 22 Dec 1992 05:11:24 GMT
Organization: mentor
Keywords: 
Followup-To: 

In article <1992Dec18.164325.2202@ccsvax.sfasu.edu>, z_johnsta@ccsvax.sfasu.edu writes:
|> I posted a message similar to this one, but somehow the subject got skewed, and
|> knowing how fast this newsgroup goes, I know most people just skip all of the
|> extraneous stuff, so here goes again...
|> 
|> 
|> Does anyone know of a source of Iron-on transfers for etching PC boards that I
|> can just print on with a laser printer and Iron on the PC board and etch?
|> 
|> I know they exist, and many thanks to the person who sent me the reply on the
|> other post.  Please respond via Email as I miss a very large number of the
|> posts on this newsgroup.
|> 
|> Thanks in advance!
|> 
|> 
After having scanned approx. 600 postings in this News Group I noticed that there 
hasn't been much discussion related to amateur PC board manufacturing.  Is there a different
group which addresses this topic or has the topic just been out of vogue lately?
From: karol+@pitt.edu (Filip M. Gieszczykiewicz (fmgst+@pitt.edu))
Newsgroups: sci.electronics
Subject: Flywheels and Space Stations
Summary: ideal power source/battery
Keywords: I hope this is original ;-)
Date: 3 Jan 93 15:56:37 GMT
Followup-To: sci.electronics
Organization: University of Pittsburgh


	Greetings. How about a bit of a change of subject. This one is
	a bit more practical (and I'd patent if I could) [smirk]

	I'm sure most folks have seen the designs for 23rd century space
	stations - you know, the "wheel" ones. Yup, how practical would
	it be to use the spinnin motion of some parts of the station as a
	storage medium? From my point of view, the gyroscopic effect of
	a giga-flywheel would be benificial because it would stabilize the
	station and oppose all the forces like shuttles docking, folks
	shooting each other with guns [hey, how do you handle that part
	of social "interaction"? Gee, it's bad enough if it happens in
	a plane...[evil grin]], and other events that would otherwise be
	handled with rocket jets.

	Also, as you may suspect, the station would aready be spinning to
	simulate gravity (at least some portions of it would be, anyways).
	Hey, not to mention that we don't need any funky bearings and there
	is already vacuum!

	So, say we have a space station that NASA wants to build. During
	the time that it is exposed to sunligh (or magnetic field or
	whatever) motors are spinning up the flywheel which can then
	supply power to the station either when main power fails or
	simply as the MAIN power source.

	I'm sure this beats having a breeder/fusion/fuelcell in the
	vicinity of the station.

	Hope this stirrs some discussion as it seems to me to be a very
	possible (or more sane) application of this wonderful and 
	efficient storage medium.

	Take care.
-- 
-------------------------------------------------------------------------------
DO NOT REPLY HERE. REPLY TO "fmgst+@pitt.edu". THANK YOU. If that doesn't work,
send that e-mail to "fmg@alpha.smi.med.pitt.edu". Proud co-owner of a Jeanie's
Teenie serial# 1: all-Al, 285lb, low-wing, 53 hp, 120 knts, experimental plane!!
From: dbak@elm.lle.rochester.edu (Douglas Baker)
Newsgroups: sci.electronics
Subject: Re: Can Cable TV Descramblers really be detec from outside ???
Date: 21 Dec 92 12:54:14 GMT
Organization: University of Rochester, Rochester NY

In article <BzLJF2.JJ6@news.cso.uiuc.edu> dvsg0223@uxa.cso.uiuc.edu (David Salamon) writes:
>dbak@elm.lle.rochester.edu (Douglas Baker) writes:
>
>>In our local paper there has been talk of detecting Il-legal cable TV
>>descrablers from outside the home.  I can think of two possible ways
>>this can be done but there may be others.
>
>I suspect that it is simpler than this.  Most people who have "illegal" cable
>descramblers are buying a complete unit by mail order that is essentially 
>the same one used locally.  The only difference is that the mail order unit
>is configured to descramble everything.
>
>Since most of the fancy commercial descramblers are remotely configurable
>or something like that, the cable company can probably send a "request ID"
>signal to all lines and see which boxes answer with a configuration that does
>not match what the subscriber pays for.


	To use one of these "black baxes" you need to run it through
a channel selector first.  The "black boxes" usually only work on channel 3.
Also, peolpe with only basic and cable reddy TV's only have to plug the cable
dirrectly in the TV itself.  To the cable Co., they both would look the same
looking in the wire even in a addresable system.  Or at least I think....




						Doug
Newsgroups: sci.electronics
From: red@esse4.dei.unipd.it (Piergiorgio Sartor 274199/IL)
Subject: Digital delay line
Organization: D.E.I. Universita' di Padova -- Italia
Date: Mon, 21 Dec 1992 12:57:20 GMT

I've to delay a digital signal for about 70nS (+-10%), how can I do this?

Please replay also via e-mail.

Thanks in advance.
-- 
					red@paola.dei.unipd.it
					red@sabrina.dei.unipd.it
From: lordSnooty@cup.portal.com (Andrew - Palfreyman)
Newsgroups: sci.electronics
Subject: Re: Vacuum-Driven Power Exchange in the Free Electron Gas
Date: Sun, 27 Dec 92 15:07:23 PST
Organization: The Portal System (TM)
Distribution: world

Jon Noring on Tom Bearden's Paper:

:       On the Possibility of Extracting Energy From the Vacuum-Driven
:                  Power Exchange in the Free Electron Gas
: [..............]
: As a possible example of actually tapping the FEG energy, the little-known
: fiber fuse effect in fiber optics cables is discussed.  Once initiated with
: only a slight heat input, this replicable effect yields anomalous excess
: energy that destructively propagates upstream at about 1 m/s velocity,
: blowing out material from the inner core, leaving small bullet-shaped holes
: at regular intervals (typically every centimeter or so) and ruining the
: cable.  Even more strangely, under certain conditions material previously
: blown out of the holes can be caused to reinsert itself *back into the 
: holes*, healing the inner core and restoring the cable's normal function.
: The author argues that the excess energy and strange reversibility may
: possibly be explained by four-wave mixing (FWM) effects in the WZI biwave 
: decomposition of the FEG-as-a-potential, with the core as a pumped PCM.
: If so, it is a *replicable* example of tapping the FEG power.
: [..............]

So, we have a "replicable effect" called "fiber fuse" producing "anomalous
heat" and "excess energy", do we?

Odd that this is not headlines around the world.
What's *your* excuse?
 --------------------------------------------------------------------------
| lord snooty @the giant |  Would You Like Space Potatoes With That?       |
| poisoned electric head |              andrew_-_palfreyman@cup.portal.com |
 --------------------------------------------------------------------------
From: liang@hpindda.cup.hp.com (Alf Liang)
Date: Mon, 21 Dec 1992 22:19:32 GMT
Subject: Microwave Oven Diode Help
Organization: HP Information Networks, Cupertino, CA
Newsgroups: sci.electronics

I am trying to find a replacement for a diode that is used in a "Tarpan (sp?)"
Microwave oven.  This diode has the part number HVPR15-4 (manufacturer's
part number is 198T016P01 8018).  Any pointers to where to order the exact
replacement or suitable substitutions are greatly appreciated.

Thanks in advance!

Alfred Liang 
liang@cup.hp.com
From: forbesm@atlantis.CS.ORST.EDU (Mark Forbes)
Newsgroups: sci.electronics
Subject: Re: RF transmitters, cellular phones
Date: 26 Dec 92 18:00:28 GMT
Article-I.D.: leela.1hi6jsINN3bb
Distribution: world
Organization: OSU CS Outreach Services, Corvallis, Oregon
NNTP-Posting-Host: atlantis.cs.orst.edu

alex@anat3d1.anatomy.upenn.edu (Alex Shrom) writes:


[stuff deleted]
>	Recently, I also rec'd a cellular phone that I have no use for
>as-is (can't afford to subscribe), but is otherwise in perfect working
>order. What can I do with it (other than using the battery, etc.)? Can
>I program it to listen in on active cells, switch cells to follow a
>call, etc.?

Try selling it. Call your local cellular dealer (not the generic 
department store, but a cellular-only dealer) and let them know you have
a used phone you want to sell. They'll be able to tell you what it's
worth and find a buyer.

My wife works for Cellular One, and the usual premise is this.

Customer can't afford a good phone, but really needs the service. In our
area, log truck drivers are in this category. They are required by law
to have communication systems handy (for forest fire and OSHA purposes) 
but radios need a base station and operator. They shop around and discover
that the department stores have these phenomenal prices on phones, but
they require you to obtain service through them. Otherwise the price goes
up by about $350. They have virtually no service or support, and they
don't really know anything about the product they're selling. Joe Logtruck
then goes to Cellular One, only to discover that the phone costs much more,
because the retailer kickback is already in the price of the phone. However,
for such cases my wife keeps a list of people dropping service or trading
up to a newer phone, and she can often get our cheapskate hero a used 
phone for $50-100 and sign him up for the ultra-cheap service rate.

He gets what he needs, a yuppie gets lunch money, and Cellular One gets
another customer. Slick.

Mark G. Forbes | forbesm@atlantis.cs.orst.edu
Newsgroups: sci.electronics
From: philip@mentorg.com (Philip Peake)
Subject: Re: Canabalism of old electronics
Date: Mon, 21 Dec 1992 20:51:26 GMT
Organization: Mentor Graphics
Keywords: 
Followup-To: 

In article <1992Dec18.203808.25583@kong.gsfc.nasa.gov>, mark stephens <stephens@kong.gsfc.nasa.gov> writes:
|> Perhaps this is a stupid question but... for those in the home hobbiest
|> arena, do yall routinely canabalise old radios, TVs, etc. for spare
|> parts?  Seems like there should be some good components to be had such as
|> pots, transformers and so on.  I don't know if its worth extracting
|> resistors, though.

When I started playing with electronics ... about 30 years ago ... that
was exactly what I did. It was the only way I could afford to play.

Things are not so easy these days, with lots of custom ICs and
PCB mounted resistors etc leaving leads which are a little
on the short side, as well as being more difficult to remove.

Philip
Newsgroups: sci.electronics
From: jeremym@ravel.udel.edu (Jeremy A Moskowitz)
Subject: Any way to CREATE Vcr+ codes?
Organization: University of Delaware
Date: Tue, 29 Dec 1992 16:22:51 GMT



I was wondering - my cable listings dont provive codes for
Comedy Central, channel 39. Drat. I always want to tape
Mystery Science Theatre 3000 on Friday Evenings and
Saturday Mornings.

I was furious when I called  Gemstar and asked them how to
get to program the numbers myself. They told me to screw off.

So, I did a little figurin'.

I played for an hour with the box, and realized something.

Year (operater) code = Channel, Time, and Length
BUT! Many times, the DATE will still be the same. Hm...

So, I was wondering if anyone WROTE a program that'll
let you input today's date, the channel you want, the time and 
length, and the VCR Plus code would be spit out.

Let me know, I am really curious.
I know theres an article in Cryptologia that decoded it, but I
want to ENCODE it, and besides, I dont have that article.
-- 
     // Email: jeremym@brahms.udel.edu------\  Monitor of---------------\
    //  Registered Commodore Amiga Developer|  Comp.sys.amiga.EMULATIONS| 
\\ //   "I'm spellunking."- BAB   "There's medicine you can take for that." - BB
 \X/           My Life Needs Cheap Dubbed in Sound Effects - Anon.
From: dan@hansen1.ncd.com (Dan Batryn)
Newsgroups: sci.electronics
Subject: Realistic DX-160 Problem
Date: 30 Dec 92 18:56:23 GMT
Distribution: usa
Organization: Network Computing Devices, Mt. View, CA, USA


	I have a Realistic model DX-160 shortwave receiver that I have
used for many years.  It has been a good general receiver up until
now.  After about 1 hour of use the unit goes completely dead.  If
I let the unit cool down for about 10 minutes it will operate again
for about 1 hour. I suspect a power supply problem, (I seem to recall
someone else with the same problem) but have misplaced the original manual that
had the schematic of the unit on the last page.  Is there anyone which
has the manual who is willing to copy the schematic page??

Thank you,

Daniel Batryn
Network Computing Devices

Newsgroups: sci.electronics,sci.energy,rec.autos
From:  ()
Subject: Re: Flywheel batteries as EV power source
Date: Wed, 23 Dec 92 18:01:40 GMT

In article <78886@ncratl.AtlantaGA.NCR.COM>, mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson) writes:

All right we've made it beyond energy density calculations!!!

> 
> The vaporized carbon-carbon will deposit itself on the first thing that
> it encounters that is cold enough to cause it to condense.
> In this case, the inside of the containment vessel.  By condensing the fluff
> will transfer the heat of vaporization to the containment vessel.
> By vaporizing the flywheel, you have not diverted the energy, but mostly
> just delayed it a bit.
> 
> The only way to get rid of this energy is to vaporize material.
> If the containment was made out of carbon-carbon as you suggest, then it
> must be massive enough that after the requisite amount of material has
> vaporized, there is still a thick enough wall to withstand the pressure
> of all of that hot gas inside the containment vessel until the unit
> as a whole has had enough time to radiate the energy away as heat.
> 
> As I see these are the data points we need for carbon-carbon.
> 
> Heat of vaporization.  (how much material is needed to absorb the energy)

I don't have the numbers but a good guess would be a compromise between the 
heat of vaporization of graphite and diamond.  

> Vaporization temperature of carbon-carbon.

Again choose the temperature of graphite, which is close to the nature of 
the fibers of carbon carbon.  NOTE if there is any O2 present the fibers 
burn long before they reach the vaporization temperature.

> Tensile strength of c-c.  

The tensile strength of carbon carbon fibers is currently > 1 million psi,
the producers won't tell you the real numbers as this field is very competative.
This means that if a carbon carbon composite is 80% fiber the tensile strength
of the composite is 800 kpsi.  The ultimate tensile strength is the tensile
strength of the graphite plane, meaning one has made a perfect single crystal
coiled graphite sheet fiber.  This perfect fiber would have a tensile strength
greater than that of perfect diamond which is 14 million psi.

> It might be nice if we knew the thermal resistance of c-c.  

The thermal conduction of carbon carbon depends on the direction.  Conduction
down the fibers is probably at most 4 W/cm K while between the fibers it is
about 0.04 W/cm K.  This means that the temperature of the exterior and
interior of the containment vessel would be relatively uniform, while supporting
a massive temperature gradient across the vessel wall.  If one could make 
fibers out of diamond, not as hard as it might sound since diamond fibers
have been grown, the intra fiber thermal conduction jumps to 20 W/cm K.  Note
that these are at room temperature.

I'm not sure if the massive thermal gradient helps us or hurts us.

Hope this helps,

Darin Olson
R&DD
LMSC
Palo Alto, CA
From: cab@col.hp.com (Chris Best)
Newsgroups: sci.electronics
Subject: Re: voice-suppression circuits,karaoke
Date: 23 Dec 1992 15:52:32 GMT
Organization: your service
NNTP-Posting-Host: hpctdke.col.hp.com


I can't help you find the company, but here's how they work
(as it was explained to me): any signal common to both
channels is removed, and signals that are different are
left in.  So I guess the song has to be stereo.

Since vocals are typically centered in the image, that's
what gets cut out.  Don't know what else does, though.
From: iqbal@creek.eel.ufl.edu (M.Iqbal)
Newsgroups: sci.electronics
Subject: Re: Pulse Shaping...
Date: 24 Dec 92 20:26:09 GMT
Organization: University of Florida

In article <1992Dec21.222037.17229@news.mentorg.com>, philip@mentorg.com (Philip Peake) writes:
|> In article <BzMEHo.66s@ncifcrf.gov>, digennar@fcs280s.ncifcrf.gov (Frank S. DiGennaro) writes:
|> |> 
|> |> This might be a dumb question, but here goes. If I put a sine wave of frequency
|> |> F into a series of N flip-flops, the output will be a square wave of frequency
|> |> F/2^N. How do I re-shape it back to a sine wave?
|> 
|> You pass it via a low pass filter, with the cut-off frequency at F/2^N.
|> 
|> If I didn't know how "digitalised" most current electronics courses
|> have become, I would class this as a dumb question - but given the
|> current (excessive) digital bisa - you are forgiven :-)
|> 
|> Philip

You would be suprised how many electrical engineers are graduating without
knowing the answer to Frank's question. If you do not believe me, run a 
test in the near by electrical engineering school. 
-- 

---------------------------------------------------------------------------
"If your annual income today is $50,000, you have the same buying power as
the average coal miner did in 1949, adjusted for taxes and inflation," John
Sestina, nationally recognized Certified Financial Planner;  quoted in 1987.
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---
Newsgroups: sci.electronics