HDTenEightyP/NetNews huggingface dataset:
From: mycal@netronix.com (Mycal Johnson)
Newsgroups: sci.electronics
Subject: Cable "silver bullets" 
Distribution: world
Date: Tue, 29 Sep 92 16:48:38 GMT
Organization: Netronix, Inc.


I would rather select just the channels I want.  I don't want to have
to pay for the shopping channel, nashvill network, bible thumper channel, and
a host of other cable channels.  I like a few of them but I hate to be
forced to pay for them all.

The main reason I have cable is to get a clear picture to watch star trek,
and thats on a local channel.

mycal

-----------------------------------------------------------------------------
                                     ?
Pirate Radio?  Whats that?        @ o o @                mycal@netronix.com
                                     O

                            Just Say Know to Drugs.
From: musone@acsu.buffalo.edu (Mark J. Musone)
Newsgroups: sci.electronics
Subject: Re: Modem carrier frequencies
Date: 2 Oct 92 14:27:00 GMT
Organization: UB


			Mark
Newsgroups: sci.electronics
From: rubin@skiing.cis.ohio-state.edu (Daniel Rubin)
Subject: Television Antennas and Grounding
Organization: The Ohio State University Dept. of Computer and Info. Science
Date: Wed, 30 Sep 1992 01:20:14 GMT

I recently installed a rooftop television antenna.  I grounded the mask as
was recommended in the instruction and I got to thinking.  Why is it a good
idea to ground the antenna?  I would think that this would invite lighting
to stike the mask!  I mean the mask is definitely the tallest point with the
lowest resistance.  Wouldn't this be inviting trouble.  I would think a
lightining strike would fry the grounding wire which is next to the house.
This seems like a fire hazard not to mention the jolt to the TV tuner etc...
Wouldn't you want to deter lighting instead of providing a ideal path for it?

Any comments...

								- Dan

-- 
  Daniel Joseph Rubin    |  "...A good football team for the alumni, parking
rubin@cis.ohio-state.edu |  for the faculty and sex for the students."
      GO        GO       |  - President E. Gordon Gee on the three things that
    BENGALS  BUCKEYES    |  a great university president must provide.....
From: CCEB001@UTXVM.CC.UTEXAS.EDU
Newsgroups: sci.electronics
Subject: Need Help With Op-amp Substitution
Date: 1 Oct 92 14:24:48 GMT
Organization: The University of Texas at Austin

My preamp is dying a slow but noisy intermittent death.  I have decided
to build a new one from scratch.  I am going for a minimalist type
preamp: input selector, volume control, on/off switch.  Maybe a pilot
light, no tape monitor, no headphone, no tone or balance controls.
Somebody else can have that 747 cockpit on night instrument landing
look.   :-)
 
Having followed and independently verified the recent thread on volume
controls, or more strictly, the difficulty of obtaining suitable pots
for them, I decided to go with the high performance voltage controlled
amplifier in Walter Jung's "Audio IC Op-amp Applications."  This would
let both channels share a no gang pot which need not be audiophile
quality.
 
This circuit requires a CA3019 which is a bunch of diodes, a ca3080a
the actual VCA chip, and a pair of 3140 j-fet op-amps.  No local parts
house will confess to any stock or even knowledge of a 3140.  I looked
in the D. A. T. A. book, and they suggested a substition for the 3140
of an OP41.  The OP41 appears to have substantially lower performance
than the 3140 which in turn was kind of suspicious.  I was unable to
locate the ca3080a in the book at all.
 
So my questions for the collective net.wisdom are:
  1)  What should I use for the 3140?  Jung says it must have a
         high input impededance.  I say it must sound good.
  2)  What is the likelyhood that I got the right ca3080a or
         reasonable substitute from my local parts house?
  3)  Is there some other high performance chip that will do without
         all the accessory bits?  The circuit, as drawn, has three trim
         pots, eight diodes, and three op-amps per channel.  (pushing
         it for a minimal preamp)
 
The book looked so reasonable till I reached for a soldering iron!
I will be grateful for replies either by posting to the group, or
email.
 
Mike.Coyne@utxvm.utexas.edu
Coyne@utxvm.bitnet
Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: multimeters
Date: Sun, 27 Sep 92 03:38:31 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Distribution: na

      The Fluke line is well thought of.  They work reliably, get excellent
battery life (years on my model 21), and are well-protected against overload.
Models range from simple multimeters through portable digital oscilloscopes
with LCD displays.  Prices start around $50-70.  

					John Nagle
Organization: Middle East Technical University - Computer Center
Date: Tuesday, 29 Sep 1992 12:30:23 TUR
From: <C51885@TRMETU.BITNET>
Newsgroups: sci.electronics
Subject: wanted FET models for MMICapplications

I am searching accurate FET models to be used in a low power MMIC application.
the frequency band in which the model is used is 1.7-1.9 GHz. Since a nonlinear
 amplification is considered the proposed FET models must include nonlinearity
effects.
From: news@usage.csd.unsw.OZ.AU
Newsgroups: sci.electronics
Subject: What is BBC CS 70 -14go2 ?
Date: 30 Sep 92 08:16:15 GMT
Organization: University of New South Wales

I want to identify the manufacturer of a large thyristor. It is made in West
Germany and is stamped BBC CS 70 - 14go2. If the data is at hand, I'd also
like to know the breakdown voltage and the maximum pulsed current.

Please email replies.

Thanks,
Michael Wouters.

mjw@newt.phys.unsw.edu.au
Newsgroups: sci.electronics
From: 48crowley@cua.edu
Subject: Querry: Compas w/ digital output
Organization: The Catholic University of America
Date: Mon, 28 Sep 1992 20:05:46 GMT

QUERRY:		Compas With Digial Output (but inexpensive)
^^^^^^

Colleagues,

	I'm looking for a compas (navigational) with a digital output, for
use in a project of mine (for undergraduate EE senior design).  A flux gate
model would be ideal.  The unit should be relatively inexpensive (less than one
or two hundred dillars - prefferably even less).  

	I would appreciate any ideas, leads, refereals or suggestions.



				Regards,

					Anthony D. Crowley

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
e-mail:	48crowley@cua.edu (internet)
	48crowley@cuavax  (bitnet)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
usmail:		Anthony D. Crowley
		205 Waltion House, CV
		The Catholic University of America
		620 Michigain Ave, NE
		Washington DC 20064
From: Don.A..Bowman@mailbox.bison.mb.ca (Don A. Bowman)
Newsgroups: sci.electronics
Subject: Re: Personal recording device
Date: 24 Sep 92 22:24:21 CST

Organization: University of Waterloo

Rod Beckwith (rodb@slugo.corp.sgi.com) wrote:
: Hello Anybody,
: 
: I was down at the  Sharper Image store yesterday & saw a device that I
: would like to know more about. I hope someone can help me.
: 
: The device was a personal recording device. It is the size of a large pen
: or penlight flashlight. You can record your voice onto a chip on one of two
: 20 second channels for playback later. I guess it is the same technology
: used on newer answering machines. The company that manufactures these
: things is Machina Inc. out of San Francisco.
: 

I while back (couple of years?) I say some indications in the "What's
New" type columns of Radio-Electronics or Modern Electrons about this.
Dallas Semiconductor had a hybrid module (like an IC, but more than one
on a mini circuit board) which did this. They were selling for 
about $20 if memory serves. Maybe check their product lines.

--
Don Bowman                (519) 744-6154     dbowman@zeus.uwaterloo.ca

 * Origin: The Electronic Mailbox (1:348/7.0)
From: rbhardin@undergrad.math.waterloo.edu (Ron Harding)
Newsgroups: sci.electronics
Subject: Where can I get PALASM?
Date: 30 Sep 92 16:21:52 GMT
Organization: University of Waterloo

I guess the subject just about says it all.  I need a PALASM program (or
equivalent... anything that generates a JEDEC PAL image) for either MS-DOS
or Amiga.  One with C source would be nice.  I hate Fortran.

I know about the Amiga PALASM in the Fish collection.  It gurus.  No good.

Thanks, muchly.

=============================================================================
From a local computer call-in show:	|  Ron Harding
Q: I hear all this talk about base      |  rbharding@descartes.waterloo.edu
   memory, expanded memory, and         +------------------------------------
   extended memory.  What is the difference, and why don't I have them on
   my Amiga?
A: Well, the Amiga doesn't offer you that kind of flexibility...
=============================================================================
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: Help with wireless mic project
Date: Thu, 01 Oct 92 00:31:30 CDT
Organization: The Inquiring Mind BBS  1 204 488-1607

jak9213@tamsun.tamu.edu (John Arthur Kane) writes:

> I am posting the following for a friend.
> 
> Please email directly to him xfmon@ttacs1.ttu.edu
> ===========================================================
> 
> In an attempt to learn about electroncis in my spare time, I have
> begun construction of a wireless FM microphone to be used as a 
> baby monitor.  I am using plans from a book titled "Build Your Own
> Laser, Phaser, Ion Ray Gun And Other Working Space-Age Projects" by
> Robert E. Lannini.  The list of parts necessary to complete my 
> project includes:  1) a 6/35 pfd trimmer cap; 2) a 5-6 pfd 0Temp Mica
> cap; and 3) an FET microphone (described as an RF supersensitive mike).
> I know little or nothing about electronics, hence my begginer's project.
> I can't find these part at any electronic warehouse.  I've tried
> Mouser Electronics, MCM Electronics, and ALL Electronics.  Neither
> has any of the specific parts called for in the recipe.  I have found
> the parts at a company called "Information Unlimited," which is 
> "plugged" quite often in the book I'm using.  Unfortunately, they
> want $9.50 for the trimmer cap, $3.50 for the Mica cap, and $9.50 for
> the mike.  These prices seem a little steep.  I would like to know:
> 1)  Is there any other warehouse that might carry these parts?
> 2)  Can I substitute these parts with something else and 
> still get a decent finished product?
> 3)  Do I just have to bite the bullet and buy from Info. Unlimited?
>  
>  On a side note, can anyone recommend any other books that might have
>  some cool beginner-type projects?  Thanks in advance for your help.
>   
>   Mark
> 
> ===========================================================
> 
> -- 
>  John Arthur Kane, N5SLH, Systems Analyst, Microcomputer Support and Training
>  Texas A&M University, College Station, TX 77843  (409) 845-9999
> 
>  email: j-kane@tamu.edu

You can save money if you know where to get surplus parts or old portable 
radios or walkie talkies. A better design might use a crystal VCXO and 
using 1 or 2 diodes to control the frequency +-200 ppm.
Trimmer caps should only cost a couple bucks. The can be an NPO ceramic 
cap instead of the more expensive cap. or if you plan to keep this at 
room temp just go with any cheap ceramic cap 5cents or so.
You can trim ceramic caps by filing them or just make a 1c/2c/4c 
combination with jumpers to select the closest frequency.
You may also use a pot and a dioe to simulate a variable cap. A diode 
when reverse biased is voltage controlled capacitor. Good one with better 
control are called Varactor tuned diodes. You then decouple the DC bias 
from the circuit using a large cap (.01uf)

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: hbg6@phx.mcd.mot.com (John Schuch)
Subject: HELP! what's a SYSTEMIZER
Organization: Motorola Computer Group, Tempe, Az.
Distribution: usa
Date: Sun, 4 Oct 1992 22:46:58 GMT


At an auction this past weekend I picked up 10 devices and can not
quite figure out what they are.

The box is about the size of an old external modem and is labeled
"SYSTEMIZER  Applied Creative Technology Inc."

The buttons on the front are labeled: system, tape 1, tape 2, new job,
copy, pause, play, record, erase, 1, 2, 3, 4, bypass. Each button has
an associated LED.

The rear panel has two DB-25 connectors labeled input and output, and
RJ-11 phone style 4 conductor jack and the input jack for the wall
transformer.

There is a recessed reset button on the side and an 8-position DIP
switch on the bottom. Inside the box there are two switches, one for
each of the DB-25 connectors which select between serial and parallel.

I connected one of the boxes between my computer and printer and have
been able to print through it and save print jobs and re-print them.

Simple, some kind of smart print-spooler. Problem is I am terribly
curious about the RJ-11 connector and the DIP switch. If this is some
kind of printer network, I can use it. If not, I'll gut them out for
the chassis' and power supplies which is why I bought them in the
first place.

So, anybody know what all these things are capable of, or better
still, know where I might find a manual.

Thanks
John

------------------------------------------------------------------------
John Schuch              hbg6@phx.mcd.mot.com              (602)438-3008
Motorola Computer Group - Technical Systems Division - Manufacturing Eng
------------------------------------------------------------------------
  "You must search out a sage, a fount of wisdom and logic, the keeper
of knowledge and the protector of right. You will know him by his smell."
------------------------------------------------------------------------
From: u009@csx.cciw.ca (G. Stewart Beal)
Newsgroups: sci.electronics
Subject: Re: Looking for 0.08" connector..
Date: 30 Sep 92 13:58:55 GMT
Organization: Canada Centre for Inland Waters

In article <8459@orbit.cts.com> dougm@pnet51.orb.mn.org (Doug Mcintyre) writes:
>Anybody have a source for tiny connectors? I need something like a female
>3-pin connector on 0.08" centers. (Oh why or why couldn't they have used
>something standard like 0.1" which is the standard and the smallest I could
>find?).
>
I chopped one off a defective floppy drive. It was used to connect the heads
to the PC board.
 
Regards, Stu Beal, VE3MWM, U009@CS.CCIW.CA,
National Water Research Institute, Burlington, Ontario, Canada.
 
"We'd made it through yet another nuclear winter and
 the lawn had just trapped and eaten it's first robin." - Kyle J. Spiller
From: pa_ross@csd.brispoly.ac.uk (Mr Rossy)
Newsgroups: sci.electronics
Subject: Re: Ultra-stable FM transmitter?
Date: 2 Oct 92 12:37:01 GMT
Organization: Bristol Polytechnic, England


>Said to transmit a stable FM carrier for several hundred feet w/builtin 
>antenna whip.  Dont have address handy, maybe someone else does.  Good Luck

Several hundred feet ?!?!?!?!?!?!?!?!?!?!?!? You should check out Suma
designs here in England ! They sell bugs usually but the devices work just as
well for FM transmiterrs, for 16 quid (Around 30 dollars) you can have a kit
that will broadcast 3 km ! The one I got goes for 1 km.

						 Paul
						=----=
From: rolf@ooc.uva.nl (Rolf Pixley)
Newsgroups: sci.electronics
Subject: Need advice on Macintosh Schematic & PCB SW
Date: 5 Oct 92 13:39:58 GMT
Organization: uvabick

I have tried demos of:
Douglas CAD/CAM
Protel Autotrax
McCad

The first two use DesignWorks for Schematic Capture
and McCad has it's own Schematic capture. At this point,
I am most impressed w/ Protel.

What I really need is opinions of current users of these 
systems.

thanx,
Rolf Pixley
Newsgroups: sci.electronics
Subject: Mail/phone sources of clock crystals?
From: rteasdal@polyslo.csc.calpoly.edu (Rusty)
Date: Sun, 04 Oct 92 20:51:19 GMT
Organization: Cal Poly San Luis Obispo, CSc Department


	Good lord, it seems to be quite impossible to find
66 MHz clock crystals for PCs anywhere I've looked or called.
Does anyone know of a reliable mail-order source, or one that
can be reached by phone? I have a system to be upgraded and
the unavailability of this single simple part is bottlenecking
the entire operation :-)





-- 
||||||||   Russ Teasdale -- rteasdal@polyslo.CalPoly.EDU  --  (Rusty)  ||||||||
-------------------------------------------------------------------------------
"Gentlemen, if we do not succeed, then we run the risk of failure." - D. Quayle

Xref: sparky sci.electronics:16254 sci.engr.mech:343
From: jgd@dixie.com (John De Armond)
Newsgroups: sci.electronics,sci.engr.mech
Subject: Endevco address/ph no.
Date: 28 Sep 92 09:11:49 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

I've misplaced my Endevco (the accelerometer people) catalog.  I'd appreciate 
someone sending me the address and phone number of them.

Thanks in advance,
John

-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine (TM) |
Marietta, Ga                         |Interested in high tech and computers? 
jgd@dixie.com                        |Write me about PE Magazine
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
Newsgroups: sci.electronics
From: arm@helix.nih.gov (Andrew Mitz)
Subject: Re: Television Antennas and Grounding
Followup-To: sci.electronics
Keywords: lightning
Organization: National Institutes of Health, Bethesda
Date: Wed, 30 Sep 1992 21:05:15 GMT

In article <1992Sep30.012014.26543@cis.ohio-state.edu> rubin@skiing.cis.ohio-state.edu (Daniel Rubin) writes:
>I recently installed a rooftop television antenna.  I grounded the mask as
>was recommended in the instruction and I got to thinking.  Why is it a good
>idea to ground the antenna?  I would think that this would invite lighting
>to stike the mask!  I mean the mask is definitely the tallest point with the
>lowest resistance.  Wouldn't this be inviting trouble.  I would think a
>lightining strike would fry the grounding wire which is next to the house.
>This seems like a fire hazard not to mention the jolt to the TV tuner etc...
>Wouldn't you want to deter lighting instead of providing a ideal path for it?
>
>Any comments...
>
There is a lot to learn about lightning and I'm no expert.  Lets see...
First, if lightning strikes an object away from your antenna, the
antenna will develop a very large current induced by the nearby "spark".
You need a path for this current to flow and through a (evaporating)
ground wire is better than through the house, or through the antenna
feed and then you (to ground).  
Second, even before a stike there is charge buildup at the antenna.
the path to ground bleeds off this charge and reduces the likelihood
of a direct strike. (Someone else who knows better, correct me if I'm
wrong.)
Third, (and most important) those people who really know about lightning
say you better have a good ground.  That is the reason *I* would do it!



-------------------------------------------------
Andrew Mitz          |    NIH Animal Center
Biomedical Engineer  |    Poolesville, MD
-------------------------------------------------

All opinions expressed are my own.
From: klimasewski@fccvde.enet.dec.com (My name is...)
Newsgroups: sci.electronics
Subject: MC68705P3S,need a programmer
Date: 29 Sep 92 18:49:58 GMT
Organization: Digital Equipment Corporation


What is the cheapest programmer I can buy that will program a
MC68705P3S??

                                      thanks,
                                         Ken
From: tocherd@ul.ie
Newsgroups: sci.electronics
Subject: Re: Personal recording device
Date: 29 Sep 92 16:51:35 GMT
Organization: University of Limerick, Ireland

In article <18979@acorn.co.uk>, agodwin@acorn.co.uk (Adrian Godwin) writes:
> Rod Beckwith (rodb@slugo.corp.sgi.com) wrote:
> #  Hello Anybody,
> #  
> #  I was down at the  Sharper Image store yesterday & saw a device that I
> #  would like to know more about. I hope someone can help me.
> #  
> #  The device was a personal recording device. It is the size of a large pen
> #  or penlight flashlight. You can record your voice onto a chip on one of two
> #  20 second channels for playback later. I guess it is the same technology
> #  used on newer answering machines. The company that manufactures these
> #  things is Machina Inc. out of San Francisco.
> #  
> 
> It probably uses the UM5100 voice processor IC from United Microelectronics.
> This will digitise, compress and record speech into an attached SRAM, and
> subsequently play it back.
> It needs a certain amount of analogue support circuitry, mostly for recording
> - a playback-only unit is a lot simpler. The only additional digital device
> it needs is the SRAM.


It's more likely to be an ISD1020 chip which is an EEPROM that stores analog
samples of speech for replay. I've used one and its great. See QST (July1992?)
for an article using it.

David Tocher EI2AMB
Dept of Maths
University of Limerick
Ireland
Newsgroups: sci.electronics
From: naiming@eng.umd.edu (Naiming Shen)
Subject: Help with filter number for DAT/CD oversampling chip
Date: Mon, 05 Oct 92 14:47:26 GMT
Organization: Electrical Engineering, University of Maryland

I have a question for you experienced digital audio guys or DSP guys:
I want to do CD data oversampling, with 16 bits unsigned integer in
and 16 bits unsigned integer out. The filter I'm going to use is a
8 bits and 40 points long filter. The operation involved will be
multiplication(8 bits with 16 bits data) and addition(sum all the 
results of the multiplications). My question is: What kind of number
should I use for this 8 bits filter? 
First I was thinking using unsigned integer, so the results of multiplication
is a 24 bits number, I can drop the lowest 8 bits and keep the highest
16 bits for output. But I loose resolution in this way.
Then I thought using unsigned integer, from -128 to +127, but there is
a possibility that the summation will be negative number, and I assumed
the output 16bits are positive number.
If you netters can give me a clue, I will appreciate very much.

Naiming,

Newsgroups: sci.electronics
From: kevinlu@yoyo.cc.monash.edu.au (Kevin Lu)
Subject: Re: Help! My CD player sk-sk-sk-sk-skips
Organization: Monash University General Access Unix
X-Newsreader: TIN [version 1.1 PL6]
Date: Sun, 27 Sep 1992 05:58:55 GMT

Speaking of CDs, just HOW durable are they?

I've develop a scratch on one of my CDs and now the CD player doesn't play
one track correctly (i.e it skips, but only on that track on that cd). I
though these things were supposed to be durable!. SO whats the story?

  +----------------------------------------+-------------------------------+
  |  Kevin Lu                              | Monash University             |
  |  Email: kevinlu@yoyo.cc.monash.edu.au  | Clayton, Victoria             |
  |                                        | Australia                     |
From: jjm13@po.cwru.edu (Jeff Murphy)
Newsgroups: sci.electronics
Subject: Re: Opening other people's Garage doors :)
Date: 4 Oct 1992 18:50:50 GMT
Organization: Case Western Reserve University
NNTP-Posting-Host: b61481.student.cwru.edu

In article <kennehra.718059469@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
>
>Hi.  I was wondering if its possible to construct a garage door
>opener that can broadcast on any frequency you want so that you can
>open other people's garage doors as you drive by :)
>

A friend of mine tried this once.  He had one of those garage doors in
which the frequency of the transmitter was set by some DIP switches
inside.  He took it apart and hooked up a counter and some other circuitry
to it so it would scan through all of the possible switch settings in
a few seconds.  He stopped playing with it, though, when he heard one of
his neighbors complain about how their garage door was acting strangely...

This would only work on garage door openers from the same manufacturer, 
though.

Jeff