HDTenEightyP/NetNews huggingface dataset:
From: rande@rtsg.mot.com (Kristian V. Rande)
Subject: Motorola's S19 conversion
Keywords: S19
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: USA
Date: Mon, 12 Oct 1992 18:22:28 GMT

On Fri, 9 Oct 1992 13:32:33 GMT mylai@cs.uh.edu wrote:

> Hi, Is there a PC program that can convert Motorola's S19 format to
> Intel's HEX format, and vice versa.

I don't know of any programs to do this, but it shouldn't be too hard
to write one yourself.  Check out the October 1991 issue of
ComputerCraft magazine.  On page 41 there's a good description of the
formats of both Motorola S-records and Intel hex records.

 ----------------------------------------------------------------------
 Kris V. Rande                                "My opinions are my own."
 Motorola Radio Telephone Systems Group
 Arlington Heights, Illinois                         rande@rtsg.mot.com

From: joeld@hpnmdla.sr.hp.com (Joel Dunsmore)
Date: Wed, 7 Oct 1992 06:19:48 GMT
Subject: Re: 25 ohm coax cable
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics

If the design calls for 25 ohm coax, you  will probably need 25 ohm 
coax!  I know of several designs where the coax  is used as a balun or
a transformer, or an impedance multiplier.  It may also be used as
a matching element in an impedance transform.  

     I don't think two 50 coax lines will work, as any mismatch in 
length or velocity factor can set up a "cavity" mode (actually, 
a shorted transmission line or "re-entrant" transmission line resonator)
which can cause serious in band "suck-outs".
This is especially true if the length of coax is approaching a significant
(> 1/8) portion of a wavelength of the operating frequency.

Joeld.

PS.  What is the circuit?
From: norm@inqmind.bison.mb.ca (Norman P. Paterson)
Newsgroups: sci.electronics
Subject: Power boost.
Date: Sat, 10 Oct 92 22:57:08 CDT
Organization: The Inquiring Mind BBS  1 204 488-1607

I would like to take a regular 9volt battery and boost its poer as much 
as possible.  How can I do this?  Size and weight of the unit is of 
importance.

norm@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: Car antenna design help wanted
Originator: sehari@vincent1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Sat, 10 Oct 1992 06:21:25 GMT

In <7'#@byu.edu> richard@ee.byu.edu (Richard Christensen) writes:


>I want to design a better car stereo antenna system. The 
>system would include impedance matching elements, baluns, 
>and an amplifier.  My question is, does anyone have a good 
>book on how the antenna works on a car.  Almost all books 
>on antenna theory, do not include anything about the car 
>antenna system.  For instance, I understand that the antenna 
>is capacitively loaded. Do the receivers anticipate and 
>match the antenna correctly, or do they just live with 
>the mismatch?  Does the antenna impedance match the 
>impedance of the feed cable or the receiver?  Any help 
>would be greatly appreciated.

>Richard@newt.ee.byu.edu

A good book in this area, which is also a graduate text for Antenna Theory
is:

Antenna Theory, C.  A.  Balanis;  John Wiely & Sons, Inc. 1982.  
ISBN: 0-471-60352-X

Library of congress Catalog # TK 7871.6.B353

                   With highest regards,
                        Babak   Sehari.

--
From: blai@eniac.seas.upenn.edu (library)
Newsgroups: sci.electronics
Subject: Need help in Cadence
Date: 16 Oct 92 16:16:00 GMT
Organization: University of Pennsylvania

Hello there

I need help in finding some concise manual or books 
about cadence. 
My email address : blai@eniac.seas.upenn.edu
 
Thanks in advance.
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: variable speed/pitch cd decks modification?
Date: Tue, 13 Oct 1992 18:22:03 GMT
Organization: U of Toronto Zoology

In article <1992Oct09.201431.26797@edsi.plexus.COM> gmeiers@edsi.plexus.COM (Garrett Meiers) writes:
>I am looking for a way to modify a cd player to be able to vary the
>pitch approx +/- 10%.   I am hoping for there to be a potentiometer in
>the unit that is used for factory adjustment to specs...

I'm not up on the details, I could be wrong... but my understanding is
that you're still thinking of the previous generation of electronics.
The timing in a CD player is probably set by a crystal oscillator,
supplying timing signals for the digital electronics that control all
the actual workings of the player.  This isn't anything as simple as a
motor-speed adjustment; indeed, CD-player motors don't run at a constant
speed, they're speed-controlled by the digital stuff.
-- 
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: cab@col.hp.com (Chris Best)
Subject: Re: Sam's Photofacts
Date: Thu, 8 Oct 1992 22:54:55 GMT
Organization: your service

Not a secret at all.

> 1-800-USA-SAMS, or order through Radio Shack.

Could be, but the number that worked for me a few months ago is:
(800) 428-7267, customer service.
Newsgroups: sci.electronics,comp.robotics
From: martinez@rodan.acs.syr.edu (Kenneth Mtz. (YONIX))
Subject: DC motors PCM control... help needed.
Originator: martinez@rodan.acs.syr.edu
Organization: Syracuse University, Syracuse, NY
Date: Tue, 13 Oct 92 12:31:42 EDT


  We have been told to use DC motors (reversible) for our micromouse
  project and would greatly appreciate if someone explained to us how   
  this is done. And also what devices are used to generate the various
  pulse lengths for the control.

  I would appreciate if you answer to me directly and am willing
  to post a summary if others are interested.

  thanx in advance,
  K.Martinez

Newsgroups: sci.electronics
From: johnr@col.hp.com (John T. Rasper)
Subject: Re: Can I use 1 power supply instead of 2 9-volt batteries?
Date: Fri, 16 Oct 1992 17:42:09 GMT
Distribution: na
Organization: HP Colorado Springs Division

kehoe@netcom.com (Thomas David Kehoe) writes:
> My op-amp prototype uses two 9-volt batteries, to supply
> +9 volts, -9 volts, and ground.  It requires new batteries
> after 5-10 hours of use, and I have a 9-volt power supply
> (that plugs into the wall).  Replacing the +9 volts battery
> with the power supply will be easy.  Is there an easy way
> to replace the -9 volt battery?

  If it has to be portable (eg: use batteries), and the actual
  voltage to the op-amp may be <= 8V, and the current is <= 100ma,
  and a conversion factor of 90% is adequate, you might check
  out a MAXIM MAX665 dc-dc switched capacitor (charge-pump)
  voltage converter.

  If not portable, use a center tapped Xformer w/linear regulators.

> 
> Would an inverting op-amp do this?  That would be easy.

  No.

--
John Rasper                         Hewlett-Packard COL
johnr@col.hp.com                    P.O. Box 2197
(719) 590-5895                      Colorado Springs, CO 80901-2197
Newsgroups: sci.electronics
From: R2NVK@VM1.CC.UAKRON.EDU
Subject: Iterative Consensus method
Organization: The University of Akron
Date: Sat, 10 Oct 1992 04:19:41 GMT

Hi,
   I am looking for the source code of iterative consesus method. Any pointers
to where i could find it or if anyone can send it to me will be really
appreciated. Thanking in advance.
                                 nagesh
 
 
 
 
 
Newsgroups: sci.electronics
From: sasarh@demetris.unx.sas.com (Tony Hefner)
Subject: Re: variable speed/pitch cd decks modification?
Originator: sasarh@demetris.unx.sas.com
Date: Thu, 15 Oct 1992 13:16:29 GMT
Organization: SAS Institute Inc.


In article <06cM02bT263G01@JUTS.ccc.amdahl.com>, drp40@cd.amdahl.com (Doug Puchalski) writes:
|> . I am looking for a way to modify a cd player to be able to vary the
|> . pitch approx +/- 10%.   I am hoping for there to be a potentiometer in
|> . the unit that is used for factory adjustment to specs...
|> 
|> I asked this question on the net a year or two ago and someone said
|> that Denon had a player out there with a pitch control on it.  I never
|> saw one though.  Perhaps it was a "studio" type player?  I say that because
|> I doubt they would market such a player for normal home usage--there just
|> wouldn't be a demand for it.

They do indeed make such a beast, my church just bought one as part of
a renovation of our sound system.  If people are interested, I could get the
model # and price.

                           -- Tony Hefner (aka sasarh@unx.sas.com)
Newsgroups: sci.electronics
From: schumach@convex.com (Richard A. Schumacher)
Subject: Re: 25 ohm coax cable
Keywords: coax cable
Organization: CONVEX Computer Corporation, Richardson, Tx., USA
Date: Thu, 8 Oct 1992 17:48:56 GMT
X-Disclaimer: This message was written by a user at CONVEX Computer
              Corp. The opinions expressed are those of the user and
              not necessarily those of CONVEX.

Putting two 50 ohm cables in parallel yields 25 ohms. The 
parallel capacitances add, and the parallel inductances
are, well, parallel; so the per-unit-length capacitance 
seen by the driver is doubled and the per-unit-length 
inductance seen by the driver is halved. This halves the 
impedance. (Doubters are invited to whip out their HP
54120 or equivalent time-domain reflectometer and check it
out for themselves.) However, this may be an awkward solution
because it requires carefully time matching the lengths of
the parallel 50 ohm coaxes.

What is your circuit? Why does it specify 25 ohms? Another
solution may be possible.
From: hcb@netcom.com (H. C. Bowman)
Newsgroups: sci.electronics
Subject: Keyboard recommendations, please!
Keywords: keyboard Motorola MPU help
Date: 15 Oct 92 14:30:44 GMT
Organization: Box of Rain Productions

Hello--
I would like to poll the collective net.mind for a recommendation on
an easy-to-use keyboard.  The suggested keyboard should be full-sized,
inexpensive, available in small-quantities, and readily integrated into
MC68HC705 / MC68HC11 projects.

Any recommendations on background reading on keyboards would also be 
greatly appreciated.  (I know nada...)

--THANKS!--
Cliff

-- 
| Cliff Bowman     |(501) 968-2232 Voice | As of 1 October, 1992, I was |
| Electronics Dude |(501) 964-6118 Pager | approximately $1,020,144 shy |
| Innovation Ind.  |(501) 968-7986 Fax   | of being a millionare.       |
From: clrmic08@uctvax.uct.ac.za
Newsgroups: sci.electronics
Subject: Student version of SPICE???
Date: 9 Oct 92 14:31:37 +0200
Organization: University of Cape Town

Is there a student or demo version of SPICE around. If so where can I get 
a copy from ? An FTP site would be the most convenient. 
Thanks
Mike
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Newsgroups: sci.electronics
Subject: Re: Re: Continuous Power, screen life
Date: 12 Oct 92 19:07:07 GMT
Organization: Hewlett-Packard, Fort Collins, CO, USA

> What is the mechanism that degrades crt brightness?  Is is phosphor
> related?  Electron gun related?  If I leave my monitor on with the
> brightness turned all the way down, will that prolong the brightness
> half life of the tube? 

Both phosphor aging ("burn") and loss of cathode emissitivy affect CRT
life, at least as far as the decrease in brightness with time is concerned.
(Breaking the neck of the tube, for example, certainly affects the tube
in a big way, but let's not consider catastrophic failures here!)

Phosphors lose brightness with time as a function of the charge delivered
per unit area; therefore, the brighter a given patch of phosphor is, and
the longer it remains that way, the faster its brightness falls off, all
else being equal.  Not all phosphors age at the same rate; for example,
long-persistence phosphors age more rapidly, in general, than short-persistence
ones.  You really need to check the specs on a given phosphor, and evaluate
the typical drive conditions in your application, to predict phosphor life.
The "screen-saver" programs that you see in some window systems are an attempt
to prolong phosphor life, but simply turning down the brightness as you
suggest will also help.

Unfortunately, this doesn't help the cathode.  CRT cathodes have an oxide
coating (barium oxide is the most common) which is the actual "electron
emitter."  Get the cathode hot enough, and put a negative voltage on it,
and this surface throws off electrons to be accelerated into the beam that
makes the spot.  However, the oxide coating is used up with time - it 
sublimates - and it can also be "poisoned" by other materials (such as leftover
gasses) in the tube.  Turning down the brightness or blanking the display
(putting the tube into cutoff) doesn't really help, as the cathode is still
above the "critical temperature" for emission, and the coating continues to
sublimate.  (Holding the CRT in cutoff for extended periods of time can
actually hasten this process, as the electron cloud which is now stuck in the
vicinity of the cathode can accelerate the "poisoning" of the cathode.)

If you can, turn the display off if you're leaving it for long periods of
time (such as overnight).  If you use a screen-saver, make sure that it
DOESN'T simply blank the screen, but instead displays some sort of low-average-
intensity moving pattern (such as the "bouncing ball" displays you've probably
seen with some screen-savers).  This will save the phosphor while at the 
same time keeping enough cathode activity going for the cathode to "keep 
itself clean."


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
From: derbyc@tplrd.tpl.oz.au (Derby Chang)
Subject: Dolby Surround
Organization: Telectronics Pacing Systems
Date: Mon, 12 Oct 1992 01:25:01 GMT

Hi all,

Does anyone have an idea how they encode multiple tracks on two stereo
tracks using Dolby Surround Sound encoding (Pro-Logic or otherwise)?


+------------------------------------------------------------------------+
|  Derby Chang			|"Cathy, I said, I have no sympathy,     |
|  Telectronics Pacing Systems	| Look up `masochism' in the dictionary" |
|  Syndey, Australia            |					 |
|  (Tel): 0011-61-2-413-6940    |               Flanagan & Richardson    |
|  derbyc@tplrd.tpl.OZ.AU	|		                         |
+------------------------------------------------------------------------+                 
Newsgroups: sci.electronics
From: klimasewski@ferite.enet.dec.com (My name is...)
Subject: PROM PRO 8,need adapters
Organization: Digital Equipment Corporation
Date: 12 OCT 92 11:41:43    


I am in need of the accessory personality modules for the PROM 
PRO 8 prom programmer made by LOGICAL DEVICES.

Please contact me via email or at 508-467-2663 (work)
                                  401-647-9632 (home)5:30pm-9:00pm EDT

                                   thanks,
                                     Ken Klimasewski

From: joeld@hpnmdla.sr.hp.com (Joel Dunsmore)
Date: Sat, 10 Oct 1992 01:00:05 GMT
Subject: Re: 25 ohm coax cable
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics

In sci.electronics, dhina@dxcern.cern.ch (Mourad Dhina) writes:

    25 ohm cable...anybody knows where to find this?
    Mourad

I got your e-mail, but I thought I would post anyhow..

25 ohm cable

Precision Tube Co. #CA25047  25+-3 ohms
		   #CA25070  25+-2
		   #CA25125  25+-3
		   #CA27034  27+-3

Uniform Tubes      #UT-70-25  25+-2
(aka Micro Coax)   #UT-141-25 25+-1
		   #UT-300-25 25+-2

As you might guess, one number is the impedance, the other number is the 
cable size in mil (inch/1000), e.g. 25047 is 47 mils, 70-25 is 70 mils.

Precision Tubes 215-699-5801
Micro-coax  215-539-0700

I happen to have both catalogs at my desk, I am sure there are many
other fine companies that make 25 ohm cable.  

Re: semi-rigid cable - Great stuff, I use it all the time.

Re: Two 50-ohm in parallel .. Technically- yes you get 25 ohms (ignoring
    common mode problems) practically, I think it not a good idea. (see
    earlier posting).

Joel D.
From: rqerce@lims02.lerc.nasa.gov (david ercegovic)
Newsgroups: sci.electronics
Subject: Anti-feedback Circuit for PA Applications
Date: 15 Oct 92 18:44:00 GMT
Distribution: usa
Organization: NASA Lewis Research Center
News-Software: VAX/VMS VNEWS 1.41

I am interested if anyone has a handy reference to the design of phase 
cancelling or anti-feedback circuits for Public Address systems where one 
is forced to place the speakers behind the microphone?

Any help/references to the circuit design appreciated.

Sincerely,  Dave
..Standard Disclaimer   ...I Know 'Nuttin!
Newsgroups: sci.electronics
Subject: Anybody out there from St Paul (Minnesot
From: Mike_Diack@kcbbs.gen.nz (Mike Diack)
Date: 9 Oct 92 00:49:21 GMT
Organization: Kappa Crucis Unix BBS, Auckland, New Zealand

Who would like to tell me what the employment oppertunities are like 
for a general practicioner of the black arts of electronics. Versatile 
(can do most anything from audio to microcontrollers) and overeducated.
Anyone in the area with a ground level knowledge - I would really like 
to hear from you (probably email better than posting better in this 
case due to narrow subject matter.
cheers, Mike.

Newsgroups: sci.electronics
From: nikke@lesti.hut.fi (Niclas "Nikke" Ek)
Subject: HY-53C464LS-80
Organization: Helsinki University of Technology, Finland
Distribution: sci
Date: Thu, 15 Oct 1992 10:30:47 GMT

I need info IC HY-53C464LS-80. I guess it is some kind of video ram.
Please let me know!

Nikke.
--

Nikke. (nikke@vipunen, nikke@niksula, s37750u@kaira, nek@otax)
From: mlevin@husc8.harvard.edu (Michael Levin)
Newsgroups: sci.electronics
Subject: why is one prong on plug wider than the other?
Date: 9 Oct 92 00:55:04 GMT
Article-I.D.: husc3.1992Oct8.205505.16186
Distribution: usa
Organization: Harvard University Science Center


    I am holding a plug, which is supposed to plug into a wall socket.
One of the two metal prongs is wider, so that the plug only fits one
way - not if you turn it over. Why is this? I thought the whole point
of AC was that the poles change sinusoidally; so how can one be
different from the other? Please direct replies to
mlevin@husc8.harvard.edu.

Mike Levin
Lines: 14
Date: Thu, 15 Oct 92 13:25:08 MDT
From: haymoree@bones (Edward Haymore)
Subject: Re: ZX80 Adapter Pinout
Newsgroups: sci.electronics
Organization: Brigham Young University, Provo UT USA
X-Newsreader: Tin 1.1 PL4

: Does anyone remember a small computer put out by Sinclair
: called ZX80? I was rummaging through my electronic junk pile
: and found the little guy and I thought I might try to re-use
: it as a controller. There is a large connector in the back
: which looks like it might have been used as an expansion slot,
: I was wondering if anyone would happen to know what the port
: is for and what the pinout is?

If you still need the info, email me and I'll send you a copy of
the connector information.

--
Ed Haymore
ed_haymore@byu.edu
Newsgroups: sci.electronics,rec.radio.cb
From: X1FT@VM1.CC.UAKRON.EDU
Subject: Re: Who has surplus night-vision stuff?
Organization: The University of Akron
Date: Thu, 8 Oct 1992 01:29:30 GMT

Check the Nov. 1992 edition of Eadio Electronics. . . in the Electronic
Shopper section in the middle.  At least three places offer gear and/or
kits for IR and star lite scopes.  Prices $189 to $750.
                               - Frank
*************************************************************************
Frank Tompkins              Internet: X1FT@VM1.CC.UAKRON.EDU
University of Akron      
Akron, Ohio   44325-3501 
  "I have not failed, I've just found 10,000 ways that won't work"
                                                     - Thomas Edison
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Serial line booster
Date: Tue, 13 Oct 1992 18:32:38 GMT
Organization: U of Toronto Zoology

In article <1992Oct13.013641.11648@ccu.umanitoba.ca> vnelson@ccu.umanitoba.ca (Gerald Vernon Nelson) writes:
>RS-232 levels are 3 to 25 and -3 to -25 volts...

More precisely, RS232C transmitters are required to send between 5 and 15,
and RS232C receivers are required to handle between 3 and 25.  (The 2V
difference on the bottom is noise margin; the bigger one on the top is
for compatibility with the ancient RS232B, which allowed sending up to 25.)
RS232D hasn't changed this.

>A machine using
>+-5 should be able to communicate to a machine using +-12, without
>modification...

Indeed so, assuming that nobody is cheating too much.  RS232 is pretty
tolerant, but as with most any form of tolerance, there are people who
will abuse it...
-- 
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
From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Thu, 8 Oct 1992 23:39:41 GMT
Subject: Re: 25 ohm coax cable
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics

vreeburg@fys.ruu.nl (Jurriaan Vreeburg) writes:

>After reading Gary's answer I had some doubt of its correctness. It implies
>that by putting two 50 Ohm coax cables in series, one is able to create a 100 
>Ohm coax cable, which is certainly not true.

??  If by "series" you mean joining them end-to-end, this is correct,
but if you "stack" them, if you _could_ stack them, it would be
right.  Imagine two pieces of coax fed 180 degrees out of phase with
equal magnitude signals.  What's the effective impedance from
center conductor to center conductor?

>
>I think that putting two cables in parallel doesn't change the impedance, since
>the impedance is defined as:
>
>                   L
>Z = square_root ( --- )
>                   C
>L: inductance per unit length
>C: capacitance per unit length
>
>What happens if we put two cables in parallel: both the inductance and the 
>capacitance increase by a factor of two -> Z doesn't change!!! Putting two 

What's wrong with this:  the capacitance doubles, but the inductance
_halves_ since there are two inductances in parallel.  But be sure
the fields from the two lines really don't interact.  And as another
poster noted, make SURE they have the same propagation delay!

>cables in series doesn't change the impedance as well, since L & C are 
>defined per unit length, which don't change at all in that case.
>
>Note that the above formula only holds for cables which are much longer 
>than the wavelengths of the signals it caries.

??  I'd claim a cable has a characteristic impedance independent of
the signals it carries, just as a resistor has a resistance
independent of any impressed voltages and currents.  I've 
successfully predicted the impedance of a line just a few feet long
by measuring its C and L at 100kHz.  These are verified by both
physical configuration measurement and formulae, and by measurement
on RF network analyzers.


Newsgroups: sci.electronics
From: Bob.Clarke%bbs@actcnews.res.utc.com (Bob Clarke)
Date: Thu, 15 Oct 92 16:35:04 EDT
Organization: United Technologies Research Center
Subject: Safety Glasses Survey
Distribution: world
X-Posting-Software: UnixBBS 1.02a S/N 190921

We are trying to update our safety glasses policy for our manufacturing
areas, and we are interested in what other companys are doing.  This
posting is aimed towards companys that do electronics manufacturing.
1) Is it selected areas or is all the mfg area designed safety glasses.
2) Is safety glasses required for inspectors? testers?
3) How do you monitor complaince?
Please e-mail with your responses so we don't clog up the net (that is
assuming anybody is going to answer!)  I would be willing to share the
survey results with anybody who contributes, leave me a note in your
response and I'll forward you the results.
Thanks in advance! Bob Clarke
--
Bob Clarke, user of the UnixBBS System @ actcnews.res.utc.com
E-Mail: Bob.Clarke%bbs@actcnews.res.utc.com
========================================================================
   United Technologies Corporation
   Opinions expressed do not necessarily represent UTC.
Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)