Re: [Phys-L] (no subject)

[Joseph Bellina <inquirybellina@comcast.net>]

When I was a grad student the people in the apartment next to mine played there tv much too loud so with a few parts I rigged up a device that blocked there tv signal. I didn’t realize I was breaking the law or could be in 1964 there wasn’t such a law 

Joe

Sent from my iPhone

> On Mar 22, 2020, at 10:02 AM, John Denker via Phys-l <phys-l@mail.phys-l.org> wrote:
>
> In the context of amateur radio,
> > on 3/22/20 5:05 AM, Bill Norwood via Phys-l wrote:
> >
> > - Were there any evesdroppers?
>
> Of course. It's radio.
> Only with difficulty is it possible to conjure situation where a radio
> signal could not be eavesdropped.
>
> OTOH eavesdropping on almost any radio signal is illegal:  47 CFR 2.701.
>
> > - Did anyone Morse with you who wasn’t who he Morsed he was?
>
> Possible, but illegal and unlikely. If somebody used a callsign that
> belonged to somebody else, the true owner would complain. If they used
> a callsign that didn't belong to anybody, that too would be noticed.
>
> 47 CFR 97.113(4)
>
> > - Was there any virus analog?
>
> You mean like urban legends?  Viral legends predate radio by thousands
> of years. They predate urbanization. They predate written language.
>
> > - What was the blocking method when one wished to deflect certain
> > Morsers?
>
> It's illegal to jam anybody's radio communication, Morse or otherwise.
> It's illegal to make, import, buy, sell, advertise, or use a jamming
> device: 47 CFR 2.803.
>
> Unless you are an agency of the US government, there is not even a
> process for applying for an exemption. 47 CFR 2.807. You might
> think a state prison would be allowed to operate a cell-phone jammer,
> but they're not.
>
> Broadway theaters would love to jam cell phone signals, but they would
> be subject to huge fines, and the FCC has no sense of humor about it.
>
> > - Were there any products promoted via Morse code?
>
> Via Morse?  Yes, of course.
>
> Via amateur radio?  Commercial advertising is illegal, but a discussion
> of this-or-that product is OK so long as there is no "pecuniary interest".
>
> 47 CFR 97.113(2) and especially (3).
>
> > - Was there ever any encrypted Morse?
>
> Morse?  Of course. Encryption is thousands of years older than telegraphy,
> not to mention radio. Morse has been encoded for compression as well as
> privacy since the earliest days of telegraphy.
>
> Amateur radio?  Secret codes are illegal. OTOH an open code (for compression)
> is OK. Also authentication.
>
> 47 CFR 97.113(4)
>
> > - Did military Morse code have any special characteristics?
>
> Encrypted for secrecy, unlike amateur radio.
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