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From: acm@bu-cs.BU.EDU (ACM)
Newsgroups: sci.electronics
Subject: Re: Jamming walkmans
Message-ID: <16101@bu-cs.BU.EDU>
Date: Tue, 17-Nov-87 20:48:36 EST
Article-I.D.: bu-cs.16101
Posted: Tue Nov 17 20:48:36 1987
Date-Received: Fri, 20-Nov-87 03:46:55 EST
References: <4149@utai.UUCP>
Reply-To: madd@bucsb.bu.edu
Followup-To: madd@bucsb.bu.edu
Organization: Boston University ACM
Lines: 27
Keywords: jamming noise interference broadcast nasty

In article <4149@utai.UUCP> cda@utai.UUCP (processor) writes:
>    I'd like to build a walkman jamming device for
>use on the train.  One for walkman radios would be
>easy, but of little use.  Any ideas whether a
>short-range tape-recorder jammer (i.e. noise
>generator) is feasible?  Any suggestions for
>such a circuit are welcome.

I don't have a circuit here, sorry, but here's some observations.

The scanners that many stores use seem to be very effective at
creating noise; creation of a similar, although probably less
powerful, circuit might work fine.

Many expensive walkmans are shielded, however.  The one that I used
all the time (Sony Walkman, the first of the "real thin" series but
far into the walkman revolution) wasn't in the least bothered by the
scanners.  Most of my friends' walkmans were.  You might note that I
was using Sony MDR20 headphones, not the real cheap ones that came
with the walkmen -- it seems likely that the headphones could be
picking up the signal, not the walkmans.

Good luck on your circuit.  I've been similarly annoyed on long bus
rides between school and home.

jim frost
madd@bucsb.bu.edu