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1994-06-04
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Date: Wed, 29 Dec 93 04:30:32 PST
From: Ham-Homebrew Mailing List and Newsgroup <ham-homebrew@ucsd.edu>
Errors-To: Ham-Homebrew-Errors@UCSD.Edu
Reply-To: Ham-Homebrew@UCSD.Edu
Precedence: Bulk
Subject: Ham-Homebrew Digest V93 #147
To: Ham-Homebrew
Ham-Homebrew Digest Wed, 29 Dec 93 Volume 93 : Issue 147
Today's Topics:
- - television disruptor - - (3 msgs)
6m quad design,help
80 M DSB transceiver project
Send Replies or notes for publication to: <Ham-Homebrew@UCSD.Edu>
Send subscription requests to: <Ham-Homebrew-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Homebrew Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-homebrew".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: 28 Dec 1993 16:25:12 GMT
From: swrinde!cs.utexas.edu!math.ohio-state.edu!news.acns.nwu.edu!casbah.acns.nwu.edu!lapin@network.ucsd.edu
Subject: - - television disruptor - -
To: ham-homebrew@ucsd.edu
quixote@eskimo.com (Looking for Sancho) writes:
> I would be interested in obtaining some device which would
> disrupt television reception around my apartment. If they
> are not so complicated, I imagine that with some patience,
> one could build one, but I do not even know the range of
> frequencies used by commercial television radio waves.
>
> The intended use of this device is to be put with a timer
> against the wall where my new neighbor has his television set.
> He comes home around midnight and keeps his television
> loud until 3 am almost every day. I wonder about the legality
> of my idea, therefore I would like something with regulated
> signal strength since I would not like to affect other neighbors.
>
> Any information about where one can buy these devices or where
> one can find a simple circuit to make one, (I know very little about
> radio or electronics), will be greatly appreciated.
What an unusual request. I spend my time worrying about how to stop what
you would like to start.
The suggestions about magnetic fields are pretty good - we have a terrible
time with the computer monitors in the vicinity (100 yards) of our 4.7
Tesla MRI. The liquid helium to keep it running is a little pricey for use
in an apartment!
When I was in college some guys at the end of the hall in my dorm ran their
stereo full blast day and night. I thought I would be smart and disrupt
them so I went over to the ham shack and borrowed a 6 meter AM xcvr. I
hooked it up in my room with a wire antenna on the floor (I wasn't trying
to transmit far!). The first time I keyed up, the noise stopped. Later I
found out that I had blown out their very expensive speakers, and they were
VERY LARGE and ... I don't think I'll try something like that again!
Greg KD9AZ
------------------------------
Date: 28 Dec 1993 17:15:53 GMT
From: swrinde!cs.utexas.edu!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!haven.umd.edu!cville-srv.wam.umd.edu!ham@network.ucsd.edu
Subject: - - television disruptor - -
To: ham-homebrew@ucsd.edu
I have found the following to work really well at disrupting the TV:
15 meter CW
2 meters, any power!
The blender does a good job, and so does the microwave!
--
73, _________ _________ The
\ / Long Original
Scott Rosenfeld Amateur Radio NF3I Burtonsville, MD | Live $5.00
WAC-CW/SSB WAS DXCC - 119 QSLed on dipoles __________| Dipoles! Antenna!
------------------------------
Date: 28 Dec 93 18:37:23 GMT
From: ogicse!psgrain!percy!klic!keithl@network.ucsd.edu
Subject: - - television disruptor - -
To: ham-homebrew@ucsd.edu
In article <CIBMDI.MsI@eskimo.com> quixote@eskimo.com (Looking for Sancho) writes:
>
> The intended use of this device is to be put with a timer
> against the wall where my new neighbor has his television set.
> He comes home around midnight and keeps his television
> loud until 3 am almost every day. I wonder about the legality
> of my idea, therefore I would like something with regulated
> signal strength since I would not like to affect other neighbors.
Of course, you should consider talking to your neighbor and apartment
manager, learning diplomacy, etc. If your apartment manager isn't
interested in providing a quiet place for you to live, you should
consider moving.
Making radio interference is illegal. Without a lot of equipment and
knowledge, there is no way to tell that you are doing it correctly, anyway.
Making his set unusable on any channel he was watching, while causing no
noticable disruption of any channel on other sets, may not even be
possible.
So, given the constraints, what can you do? I suppose you could degauss
the fellow's TV set for him - a few hundred pounds of wire, made into a
very big coil, and connected to line, would cause the picture on his
screen to change colors and wave back and forth. It would take some
experimentation and a hell of a lot of wire (perhaps 200 turns around
a 5 foot form) to find something that generates a big AC magnetic field
but doesn't blow your circuit breaker. It will also make a loud hum
if it isn't VERY sturdy and the windings aren't firmly anchored.
Now, this will subject *you* to a big time varying magnetic field, and
might give you some loathsome disease (if tabloid science is to be believed),
but all the effort of making it will exhaust you and make it easier for
you to sleep.
:-)
Keith
--
Keith Lofstrom keithl@klic.rain.com Voice (503)-520-1993
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Power ICs
------------------------------
Date: 28 Dec 1993 16:58:54 GMT
From: swrinde!gatech!howland.reston.ans.net!math.ohio-state.edu!mane.cgrg.ohio-state.edu!aus1.robins.af.mil!wrdis02.robins.af.mil!gwood@network.ucsd.edu
Subject: 6m quad design,help
To: ham-homebrew@ucsd.edu
would like to fine a design for a 6m quad 5,6 element
if any one out there could help me you just dont't know
what it would mean to me .
KC4YBL
GREG WOOD
------------------------------
Date: Tue, 28 Dec 1993 13:18:39
From: agate!howland.reston.ans.net!pipex!sunic!trane.uninett.no!news.eunet.no!nuug!telepost.no!a11a156.saga.no!Anders.Fongen@ames.arpa
Subject: 80 M DSB transceiver project
To: ham-homebrew@ucsd.edu
In article <1993Dec23.224415.391@chmeds.ac.nz> spearce@chmeds.ac.nz writes:
> Electronic Australia recently ran an article on a DSB 80 transceiver
>with a synthesiser in built.
I Have seen CirkIt (UK) selling something like this. It comes as a collection
of kits, and I don't have the most recent catalogue. Something around GBP150
for a complete kit, (a vague memory).
By the way, what does "DSB" means? Double sideband with attenuated carrier? In
the ARRL handbook, DSB is equivalent of AM. "Double Sideband, attenuated
carrier" bears no designation in the modulation chapter in the ARRL handbook.
Would anyone consider the use of "DSB" as a considerate modulation in a
crowded spectrum (this is no critics to you, Stephen)?
Send me a mail, Stephen, if you need CirkIt's address and more info.
Anders Fongen, Norway (LA6UIA)
------------------------------
End of Ham-Homebrew Digest V93 #147
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