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Generate AM Radio Broadcasts With Your Monitor

chrisd posted more than 12 years ago | from the makin-some-music-via-the-db15 dept.

Music 328

tessellation writes: "Tempest for Eliza is a program that uses your computer monitor to send out AM radio signals. You can then hear computer generated music in your radio." Here is your big chance to disrupt free thinking radio programs in your neighborhood.

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old school (-1, Offtopic)

Anonymous Coward | more than 12 years ago | (#2618037)

hot grits, natalie portman, yada yada yada

LINUX ROCKS!! (-1, Offtopic)

Anonymous Coward | more than 12 years ago | (#2618055)

It sure does [] rock!


count_sporkula (446625) | more than 12 years ago | (#2618167)

morning people,
get those posts in early, only three troll tuesdays 'till christmas ....

erm, windows is great, yeah!


Linux_Fag (538327) | more than 12 years ago | (#2618250)



Done it... (3, Interesting)

Kymermosst (33885) | more than 12 years ago | (#2618038)

It really worked... it took more work than the instructions portrayed to get it working, but it's pretty nifty.

Can't do MP3s yet... at least, not the version I tried.

first post?

Re:Done it... (1)

stonecoldt (525628) | more than 12 years ago | (#2618060)

How far away can you hear it?

Re:Done it... (3, Informative)

Kymermosst (33885) | more than 12 years ago | (#2618075)

With a crappy radio, it had to be fairly close 5 feet to make it out... my monitor doesn't put out that much rf... it's a low-rad type.

Now, putting my ham radio at 5 watts about 10 feet away does interesting things to my monitor, I can tell you that!

This first logged in post (-1)

Wil Wheaton (532837) | more than 12 years ago | (#2618039)

is brought to with the support of troll tuesday.

Thank you.

A Condensed History of the Penis Bird (-1)

Klerck (213193) | more than 12 years ago | (#2618041)

For years now, the common American penis bird has been a staple of every American's daily diet. Whether it be penis bird sandwiches, fried penis bird, or perhaps penis bird under glass (for the rich), we all have penis bird at least once a day. Many Americans have no clue how the penis bird became so important in the pyramid of a balanced diet, so in this article I will attempt to explain its history and why it is so useful.

In the early 1870s, Francis Zefran became the first penis bird breeder in North America. He started his famous Penis Bird Ranch in Canton, OH. At the time, not much was known of the penis bird's nutritional value, but the Penis Bird Ranch changed all of that. Not only did Francis Zefran raise penis birds to sell their colorful plumes (a VERY lucrative business), he also set up the world's first research lab dedicated solely to the study of the penis bird.

The lab found many interesting things. First, it was discovered that the penis bird was actually semi-sentient. Second, the scientists found that the meat of the penis bird was high in protein, vitamin A, vitamin B, and calcium, while low in fat, cholestorol, and sodium. Never before had such a nutritious meal been had without supplement or fortification. The scientists of the lab recommended immediately that the penis bird become a part of every American's daily diet.

When the news of the penis bird's usefulness reached president Rutherford B. Hayes, he was absolutely ecstatic. You see, President Hayes owed a number of favors to Francis Zefran because as I said earlier, the penis bird plume trade was an extremely lucrative business and Mr. Zefran was important in getting RBH elected through a number of monetary gifts. President Hayes immediately asked Congress to pass what we all know today as the Hayes/Zefran Penis Bird Consumption Act.

The act did a number of things to make the penis bird a daily meal, most important of which was the requirement that for every four people in a household, one penis bird must consumed every day. Another thing the act did was create an artificial monopoly for Francis Zefran's Penis Bird Industries. The act stated that the only supplier of penis bird meat in the US would be PBI. As one would imagine, this quickly made Francis Zefran into the richest man in the world. He was soon a multi-billionaire (quadrillionaire with today's inflation). Never before had a single man seen such wealth.

Many challenges were made to the Hayes/Zefran Penis Bird Consumption Act, and several even made it the Supreme Court. It was argued that the act was unconstitutional and went against liberty itself, but once the detractors tasted delicious penis bird meat for the first time, they immediately dropped their cases and followed the law to the letter. We all know today that penis bird is the most delicious meat man has ever known, but at that time, the only meats people ate were pork and beef.

In the early 1970s, though, challenges to the act began again. Many argued that the monopoly given to Penis Bird Industries by the act was in all ways unamerican. The Supreme Court finally agreed, and in 1974, Section II of the act was struck down. This in effect opened the market to competition for all.

Today, Penis Bird Industries is almost no more. Today we have the market leader Penis Bird Meat International facing against Penissoft, a recent startup. Where will the future lead the penis bird market? Only time will tell us, but one thing is certain: penis birds are here to stay!

< )
( \


Re:A Condensed History of the Penis Bird (-1, Offtopic)

jchawk (127686) | more than 12 years ago | (#2618059)

Well mod me down for this one, but I must say that I really enjoy browsing at -1 now a days on slashdot. Funny and interesting stories like this one, about the Penis Bird really make me laugh, and hell their often more interesting then what's modded at +5!

Re:A Condensed History of the Penis Bird (-1)

Klerck (213193) | more than 12 years ago | (#2618077)

Thank you, I am glad to entertain.

Re:A Condensed History of the Penis Bird (0, Offtopic)

ameoba (173803) | more than 12 years ago | (#2618113)


I'd almost suggest opening up a slashdot section for trolls, but it'd defeat the purpose.

Re:A Condensed History of the Penis Bird (-1)

Anomymous Coward (303315) | more than 12 years ago | (#2618308)

well ...

try this [] or this. []

not that either are really worthwhile, but occasionally they're entertaining.

Re:A Condensed History of the Penis Bird (-1)

count_sporkula (446625) | more than 12 years ago | (#2618174)

yup, i agree - most of the comments thast are 0 or less are much more 'informative' and 'interesting' than the ones that usually get modded up. but then we all know that the moderators are on some sort of impure crack anyway.

Re:A Condensed History of the Penis Bird (-1)

Klerck (213193) | more than 12 years ago | (#2618192)

It's ass crack. My ass crack. They're all licking and sucking at it now.

weird, its not working (4, Funny)

ddent (166525) | more than 12 years ago | (#2618043)

I wonder if it has something to do with how thin my monitor is... now wait a second, does this work on LCDs? :) Oh, maybe thats why...

Re:weird, its not working (-1, Offtopic)

Anonymous Coward | more than 12 years ago | (#2618106)

haha cock gobbler
it'll work in your LCD too you just need to retune the program

stream mp3s? (5, Funny)

stonecoldt (525628) | more than 12 years ago | (#2618056)

.ogg files would sound so much better out of that AM radio. :-P

This isn't the first (5, Informative)

recursiv (324497) | more than 12 years ago | (#2618061)

This isn't the first time something like this has appeared on slashdot. Way back in the day ('99) there was an article [] about a guy who was using the radio interference from his motherboard to do the same sort of thing.

Next thing ya know... (2, Funny)

WyldOne (29955) | more than 12 years ago | (#2618084)

Someone will use an optical mouse as a laser radar jammer.

Re:This isn't the first (1, Funny)

Tails (20769) | more than 12 years ago | (#2618125)

You beat me to it. I submitted the similar article back in '99 and felt a strange sense of deja-vu reading the slashdot headline. Common slashdot, lets try to keep it fresh!

Re:This isn't the first (0, Redundant)

quinto2000 (211211) | more than 12 years ago | (#2618295)

Not everyone has read Slashdot for several years, or reads it religiously each day. I, for one, found this to be something interesting that I learned a little about. Similarly with the steganography articles: it's an old concept, I had heard a little about it, but the Slashdot post for once actually gave me new information. This kind of story is much more "news for nerds, stuff that matters" than an announcement of the next kernel prerelease. If it's a little redundant, it's worth the price.

Back in ancient times (4, Interesting)

ynotds (318243) | more than 12 years ago | (#2618064)

This is really testing my memory, but I think it was after we upgraded from our IBM 1440 to an early System/360 that our operators discovered they could tune an AM radio to a certain frequency and thereby listen to the puter.

Maybe somebody with a better memory might know a few more details.

this reminds me... (3, Interesting)

anotherone (132088) | more than 12 years ago | (#2618065)

This reminds me of a game I used to have for my TI-82. As I recall it was a dumb game, but it was the first (and as far as I know, the only) calculator game with music.

I think it worked by twiggling the link port's connection really fast or something, but if you held it near an untuned radio, it'd play really poor music. Really, really bad music. But, hey; what do you expect from a damn calculator?

Anyway, this is one of those completly useless, yet incredibly cool things that I like to see. Very neat.

Re:this reminds me... (1)

10e 999 (128948) | more than 12 years ago | (#2618079)

Actually, the TI's motorola processor has a few sound instructions that produces (I believe) 2 bit sound. This was on a TI-85, but I've never seen it used before.

Re:this reminds me... (2)

ameoba (173803) | more than 12 years ago | (#2618096)

but there's no speaker in the machine, so what good is it?

or are you saying that the CPU has radio tranmission opcodes? Something says the FCC would look poorly on that.

Re:this reminds me... (1)

WorldSpawn (313311) | more than 12 years ago | (#2618120)

>but there's no speaker in the machine, so what
>good is it?

Well, there's no speaker, but with an adapter you can plugin some headphones. I tried this, but I never got it to work very well. There were some programs that supported it though.

What!? (1)

autopr0n (534291) | more than 12 years ago | (#2618227)

The TI8x calcs (except the 89, which is just a 92 without a keyboard) all use zilog z80 chips.

The link port is just a 1/16th inch (i think) headphone jack. If you want to listen to audio out of it you just have to plug in regular headphones (not a radio)

Re:this reminds me... (5, Interesting)

FuegoFuerte (247200) | more than 12 years ago | (#2618091)

Actually, quite a few of the games for the TI-86 have music. Mario does, and I believe Tetris does also. (at least the versions I had). I've since gone to the TI-92+, and haven't tried it with that. On the 86, I heard rumors that you could tune it with an AM radio, but you could also plug headphones straight into the data port (with an adapter to go from the 2mm to the 3mm plug) and hear the sound great. Someone actually wrote a program to play music that way, though you can't fit much music into the memory on the 86. Pretty crappy quality too. You can probably still find the programs and info on or somewhere. It's been a couple years, so I don't remember where I first found out about it.

It really works! (1)

ebbomega (410207) | more than 12 years ago | (#2618154)

I put my TI-82 up to the stereo and heard Destiny's Child!

(Okay. Bad joke. Couldn't resist... Mod me down as deemed necessary...)

Re:this reminds me... (2)

Barbarian (9467) | more than 12 years ago | (#2618202)

Back when the Hp-48G or GX was new, there were lots of games released with music...

Floppy Drive Music (2, Interesting)

kotku (249450) | more than 12 years ago | (#2618283)

A guy at school years ago used to get his kicks by getting various computer peripherals to play music. The best was a 5 1/4 " floppy drive playing yankee doodle dandy. I think he just drove the head on the drive back and forwards in time with a sound input file. Dot matrix printers could also pump out a pretty tune.

Unfortunately I know longer know this person and a cursory google search turned up nothing on floppy drive music. If anybody has a program to do the same then please post. I don't recommend running this on your own computer though :)

Weird. (1, Interesting)

MasterOfDisaster (248401) | more than 12 years ago | (#2618066)

This could be one of the stranger uses of standard hardware I've ever seen. Would it be possible to make signals more fun then just beeps? Cause, beeps are cool...but, brodcasting audio at a higher quality would be very cool. I mean, hell, we all have some spare CRTs laying could be your own personal radio station! no need for a stinkin can just use your screen.
I shudder at what people will come up with next...

Re:Weird. (1)

Kymermosst (33885) | more than 12 years ago | (#2618086)

I shudder at what people will come up with next...

One day, I'll make a car powered by stupidity

I think your .sig coming true would make me shudder. :)

Re:Weird. (0, Offtopic)

bonzoesc (155812) | more than 12 years ago | (#2618135)

You haven't seen "The Fast and the Furious" have you? Awful movie that brought ricer culture to North America.

Re:Weird. (OT) (2)

ThatComputerGuy (123712) | more than 12 years ago | (#2618185)

Err.. that movie did noo bring ricer culture here... rice rockets have been around for many years, unfortunately...

The movie just highlighted how horribly pathetic most of them are. Granted, there are some that are worthy of being called sports cars, but a stock Civic w/ 5 inch exhaust tip and 2 foot spoiler... hell, that stuff's only going to weigh it down.

rice rockets (0, Offtopic)

autopr0n (534291) | more than 12 years ago | (#2618236)

Rice rockets are what American Bikers call asian motercycles, Rice Boys are a term used for usualy asian kids who do freaky and fruitless things to their usualy asian cars.

Re:Weird. (OT) (1)

class_A (324713) | more than 12 years ago | (#2618237)

You should see what it's like over here in the UK [] where people regularly spend more money trying to improve their shopping trolley of a car (ie. Vauxhall Nova) than they actually paid out to buy the thing in the first place.

Huh? (1)

autopr0n (534291) | more than 12 years ago | (#2618230)

rice boys have always been in north america.

Re:Weird. (5, Funny)

Andux (260446) | more than 12 years ago | (#2618108)

it could be your own personal radio station

Great. We could piss off the RIAA and the FCC, all at once.

Seriously, though, I doubt you could get a strong enough signal out of it for a decent broadcast (and if you can, you're probably glowing in the dark already). You'd be better off just bolting a big chunk of metal to the roof and doing things the old-fashioned way.

what about a beowulf? (2, Funny)

Barbarian (9467) | more than 12 years ago | (#2618212)

Seriously, though, I doubt you could get a strong enough signal out of it for a decent broadcast (and if you can, you're probably glowing in the dark already). You'd be better off just bolting a big chunk of metal to the roof and doing things the old-fashioned way.

Imagine a beowulf of these, though...

Eliza? (3, Funny)

the Atomic Rabbit (200041) | more than 12 years ago | (#2618067)

Huh? Does the program use your monitor to produce a radio program about psychotherapy? How do you describe your problems to it?

Re:Eliza? (5, Funny)

x136 (513282) | more than 12 years ago | (#2618234)

]Hello Eliza.
]I don't feel very good.
Why is it that you don't feel very good?
]Well, my monitor is talking to my radio.
Are you concerned about your monitor talking to your radio?
]Well, yes. It's not supposed to work that way.
Why isn't it supposed to work that way?
]Shut up Eliza.
Why do you want me to shut up?
]Because you are a stupid worthless computer program.
I sense much anger in you. Perhaps you should seek medical help.
]Oh, what do you know?
What is it about what I know that interests you?
I don't understand what you mean by ARRRRRRGGGHHH!!!. Please try again.
OK. Goodbye.

Van Eck phreaking (5, Informative)

jasonzzz (415795) | more than 12 years ago | (#2618068)

For many years during the cold war, the NSA had
been nervous about natural radiations emanating/broadcasted by VDTs and electrical wiring. So much so that many government sites were constructed with TEMPEST safeguards with thick concrete walls, wiremesh shielding and isolated electrical works. Even then, VDTs, type writers, phones, and other electrical devices were never placed close to walls adjacent to the outside of the enclosed space.

Read the Van Eck document.

Read the TEMPEST page

Re:Van Eck phreaking (1)

Ella the Cat (133841) | more than 12 years ago | (#2618208)

I typed "van Eck LCD" into Google. From what little I read, monitors using LCDs radiate less than monitors using CRTs as I'd expected. Then again, everything radiates so if you're that worried about security your chances of building a quiet box are minimal. I suppose it's mechanically easier to shield an LCD and it won't overheat as much as a CRT (air vents leak radiation).

SPAMBOTS C'MON DOWN (-1, Offtopic)

Anonymous Coward | more than 12 years ago | (#2618069)


Maybe this will teach you to try and be smart.

And I have more on the way.


So, to generate a stronger broadcast... (0, Offtopic)

Anonymous Coward | more than 12 years ago | (#2618070)

you will need a Beowulf cluster of monitors.

legality? (2, Interesting)

rootofevil (188401) | more than 12 years ago | (#2618074)

Doesnt every piece of electronic equiptment i own have that little FCC sticker that says it must accept any undesired interference, but not cause any of its own? wouldnt this fall under that exact category?

Re:legality? (2, Interesting)

ocelotbob (173602) | more than 12 years ago | (#2618278)

This is perfectly legal. All electronic equipment is spec'ed to a certain amount of interference it can radiate. What this hack is working on is the fact that a monitor should be sending out a pretty fixed frequency that can be picked up by an AM radio, similar to how you can hear a repetitive beeping sound if you hold a remote next to an AM receiver in just the right spot. The FCC doesn't care because unless you do some heavy tweaking to your monitor, this isn't going to affect more than the 10-15 foot radius a monitor would normally slightly affect. You're allowed to microbroadcast that amount of distance.

Re:legality? (0)

Anonymous Coward | more than 12 years ago | (#2618286)

No. 'Cause in this case it's desired interference. :-)

this is amazing (1)

seann (307009) | more than 12 years ago | (#2618076)

enough said.
try it out.
this is what they should teach kids in school.

kernel? (4, Funny)

ameoba (173803) | more than 12 years ago | (#2618082)

Considering that the 2.5 kernel development cycle hasn't begun yet, is there still time to get the Monitro Sound device driver put in?

Re:kernel? (0)

Anonymous Coward | more than 12 years ago | (#2618129)

What planet are you from? It started last thursday.

subliminal messages (3, Funny)

elizard2k (532787) | more than 12 years ago | (#2618095)

This is your chance to send out the many subliminal messages to the poor listeners at your work/neighborhood. *snicker*

*crackle* this program has been interrupted by your next door geek .. buy him computer parts *crackle*

Ok, how much copper do I have to get... (1)

Maxlor (315315) | more than 12 years ago | (#2618099)

Ok, how much copper do I have to buy to stop it? I have to admit that it's freaking me out a bit how easy it is to pickup the screen's radiation after all, and to make sense of it.

Hm and now I know why PGP lists that "secure viewer" as Tempest-resistant too....

for the lazy (4, Funny)

swagr (244747) | more than 12 years ago | (#2618101)

Put an AM tuner near your box, and you'll easily find a frequency (many in fact) that let you hear your PC.

Type some keys... move your mouse, open a window...

Not only are you broadcasting... you're composing...

Re:for the lazy (1)

x136 (513282) | more than 12 years ago | (#2618242)

Or just hook up some headphones to the built-in audio on the motherboard. Turn up the volume. Tada! Annoying noises.

A better way to tell the eavesdropping feds... (3, Funny)

i22y (10479) | more than 12 years ago | (#2618107)

"All your base are belong to us!"

All your funny are belong to six months ago! (4, Funny)

ebbomega (410207) | more than 12 years ago | (#2618166)

Someone set up us the dead horse!

FWIW (5, Interesting)

adolf (21054) | more than 12 years ago | (#2618109)

While the instructions say to use a shortwave radio tuned to 10MHz, I found that a regular broadcast-band AM radio worked fine. Just chop a zero off of the frequency, and tune in somewhere around 1000. (1030 was what my tuner said, at the point where the "music" was most plainly heard).

Spooky stuff, this.

Re:FWIW (1)

big_hairy_mama (79958) | more than 12 years ago | (#2618274)

Awesome! It doesn't sound as good this way as the tempest.mp3 did (not that that sounded "good" either), but this is the coolest thing that has ever come out of /. :)!

Oh geez (1)

doormat (63648) | more than 12 years ago | (#2618111)

How long before the RIAA comes in and tries to force owners of CRTs to stop rebroadcasting copyrighted material. =^/

Wireless LAN (2, Interesting)

cra (172225) | more than 12 years ago | (#2618114)

So, basically, by hooking up some old AM radios ("slightly" modified, of course) to every computer in my home, and by installing some sofisticated software (Will I need a "slightly" upgraded version of the mentioned software, I wonder?), I can actually have a wireless LAN in my home, right?

What? (1)

shaunak (304231) | more than 12 years ago | (#2618119)

"Here is your big chance to disrupt free thinking radio programs in your neighborhood."

Yeah right Chris, do that on your 400 inch monitor that gives out enough EM emission to cause spontaneous electron-positron pairs to be created in your neighbourhood.

Laptops? (2)

krokodil (110356) | more than 12 years ago | (#2618121)

This is first time I am sorry I have a laptop!

Nice, but we can do better. (1)

stuffman64 (208233) | more than 12 years ago | (#2618122)

Wow, this is really a cool concept, but it is not without its faults. First off, this program only works in short-wave AM, not the regular AM that we all have on our radios. The documentation states a default frequency of 10E7Hz (10MHz), and I doubt that you can get it to work at regular AM frequencies (.53 to 1.7Mhz). A darn shame considering my stereo is literally 1 foot away from my computer...

Secondly, your audio options are limited. Although I have yet to try the program, I'm sure what you get is a MIDI-esque playback of Beethoven's "Song for Eliza" (a.k.a. Fur Elise) at best. Likely, it is just sine-wave beeps at the right frequency. The next step is to figure out how to play .wav files, and the holy grail, mp3 and Ogg Vorbis. I'm sure someone will figure out how to do this in the near future, although I could not imagine good audio fidelity from this method. No worries though, it is not like you bought your monitor to play music. The concept, however, is one of the best I have seen in recent memory. Just don't go modifying your monitor to be a local radio broadcast station, I'm sure the FCC would not like that!

Privacy Issues? (1)

MikeyLikesIt! (313421) | more than 12 years ago | (#2618123)

From the Tempest page, it seems like you could potentially do the opposite of what this guy is doing - that is, you could tell what is being displayed on someone's monitor by picking up the AM signals from it and reconstructing it on your own display.

So much for all the concern about people picking up your 802.11 traffic! Soon you'll be seeing people driving around with high gain AM antennas, snooping for whatever company memo is on your screen!

Re:Privacy Issues? (4, Insightful)

Graymalkin (13732) | more than 12 years ago | (#2618184)

that's called van Eck phreaking and has been around for a while now. With a sophisticated enough antenna array you can get basically a screen dump from someone's CRT monitor. With even better equipment and the right processing you can monitor closed circuit signals just by listening to the EMR they give off when current in run through them. Radioshack has the parts to build a toy that can tap a telephone line without splicing wire or having access to cables or trunks.

Read about this kind of thing once. (1)

ebbomega (410207) | more than 12 years ago | (#2618187)

F2F by Philip Finch. Some hacker posts on a BBS about how we now lack any type of privacy or safety from those who are smart enough to invade peoples' lives...

Well, he attempts to then crack every computer of the people who respond to his post and proceeds to hunt each and every one down. Well, one of them, a hacker/phreaker from the 70s, had designed this device that essentially does just what you proposed here... he tracks down where this bad-guy killer person and checks out the guy's monitor from the broadcasted AM signals. Essentially giving him a unidirectional trojan.

Excellent read. I highly recommend it for anybody who likes Cyber-thrillers. And anybody who likes action-driven novels (Also check out Paradise Junction by the same author).

Re:Privacy Issues? (1)

Phork (74706) | more than 12 years ago | (#2618214)

they will need very large cards to have "high gain" am antennas on them.

Can this be used for transmitting voice? (4, Interesting)

dhanav (313625) | more than 12 years ago | (#2618130)

Code a picture that will produce a voice and we have an encrypted speech. Sounds interesting. I am going to display all those pics in my collection and listen for hidden messages :).

Huh? (1)

MikeyLikesIt! (313421) | more than 12 years ago | (#2618131)

What does Art Bell have to do with any of this?

I don't listen to his show - am I missing some sort of inside joke here?

Re:Huh? (1)

ocelotbob (173602) | more than 12 years ago | (#2618287)

chrisd is just making a swipe at the "unusual" topics frequently discussed on Art's program. He's just saying that using an AM radio to listen to a rendition of fur Elise performed by a CRT is more fascinating than listening to Art Bell.

Dupe? (1)

Majik (31912) | more than 12 years ago | (#2618138)

Although nothing is coming up, I could swear we've seen this story on slashdot before. Really...
This is old hat, and I coulda sworn it's been covered here before.

Nice demonstration... (1)

pen (7191) | more than 12 years ago | (#2618140)

This is a nice little demonstration that could be used to show people just how easy it is to monitor someone else's computer usage. Anyone out there working for a company that sells Faraday cages? :)

And since we're on the topic of Tempest, does anyone know how well PGP's "Tempest-proof" Secure Viewer works?

Subliminal Channel (1)

ultrasound (472511) | more than 12 years ago | (#2618150)

Another subliminal channel for those FBI Trojans.

I wonder how much information you could leak out without the user noticing - bandwidth for a few passwords and CC numbers is not much.

The Fabulous Altair Connection (5, Funny)

foqn1bo (519064) | more than 12 years ago | (#2618151)

I recall hearing something once about the homebrew computer club @ Cal back in the 70's doing something like this using an Altair and a radio to play The Beatles' classic, "Fool on the Hill". It was judged the most interesting and useful thing anyone had managed to do with an Altair yet. I am glad that over 20 years later programmers are dedicated to making our computers just as useful and practical.

listen to the monitor (1)

dragonfly28 (466802) | more than 12 years ago | (#2618152)

This really puts a nice perspective into Eckhart phreaking. All the stories of radiation comming from your can be 'caught' and the info of your screen then been dubbed onto another screen.

Just tune in the radio !

Why it's called Eliza (3, Insightful)

dido (9125) | more than 12 years ago | (#2618153)

Well, it didn't immediately click because the Beethoven song he used to test the program is better known by its German name: "Für Elise" (well, that's what the book of piano pieces I used to have calls that tune). Trouble is, everyone's associations to the name 'Eliza' is the 'AI' program by Joseph Weizenbaum...

tempest.mp3 (0)

Anonymous Coward | more than 12 years ago | (#2618156)

What's the song in the mp3 given at the site? (tempest.mp3)

Surprised this hasn't been done ad naseum yet... (1)

ebbomega (410207) | more than 12 years ago | (#2618158)

Hopefully, with any luck, a plethora of pirate radio programs will spawn out of this and we'll eventually do to radio waves exactly what Napster did to music.... Pump Up The Volume style...

Honestly, I'd really love to see stuff like that. Total anarchy raged on the airwaves... It'd definately kick the crap out of CRTC (FCC down there I suppose) and we could once again be given the option of Free Press...

I personally will spearhead a Happy Harry Hardon campaign... Who's with me?

Re:Surprised this hasn't been done ad naseum yet.. (1)

sheol (153979) | more than 12 years ago | (#2618207)

Unfortunately, the signal coming from your CRT is pretty weak. I had trouble picking it up on a radio more than a few feet away.

With the right tweakage... (1)

ebbomega (410207) | more than 12 years ago | (#2618247)

That problem could be fixed. It's just a matter of time and ingenuity. There's no such thing as can't be done...

I suppose this is once again contributing to my dream of the geeks raging Beyist [] Poetic terrorism on the planet and subverting all the stupid (IMO entirely) laws we can eventually work our way around...

Re:With the right tweakage... (1)

ocelotbob (173602) | more than 12 years ago | (#2618303)

That problem could be fixed. It's just a matter of time and ingenuity. There's no such thing as can't be done...

the problem is, with the amount of engineering you'd need to do, it would be cheaper and easier to set up a maildrop in either Canada or Mexico, and have one of the many radio transmitter manufacturers send you their full power kit to that address. It would simply be way too much work to redesign a CRT to put out enough interference to broadcast to a further distance. On top of that, before you could use it, you'd have to get it tested to make sure that it complies with the FCCs emf interference standards. Since the whole point of this design is to increase those emissions for your own uses, the application for your design would be denied. If you decide to go without getting regulated, the FCC would more than likely pop you once they start getting complaints from your neighbors that their TVs, radios, etc, are playing some weird broadcast. Believe me, the FCC has all their bases covered in situations like this - can't have the common man cheapening Clear Channel's airwaves, can we?

interference question (1)

theluckman (205155) | more than 12 years ago | (#2618161)

Would this interfere with the AM broadcast I have coming from my braces? I'd hate to alienate all of my listeners.

WTF is wrong with artbell? (0)

Anonymous Coward | more than 12 years ago | (#2618165)

He's not exactly an FCC frontman, I think you're just an idiot.

Tempest Background Info (1)

thesolo (131008) | more than 12 years ago | (#2618168)

You can find a good source of Tempest Info here: htm []

I find it very funny that this information used to be classified in the 1950's.

Geek history (2, Interesting)

pacc (163090) | more than 12 years ago | (#2618173)

It all began somewhere in California when a student didn't think that pulling a few switches to get a few red lamps to produce the answer was good enough.

With a bit of experimentation he produced a program that did nothing, but when he tuned in the radio next to the old monster a small tune was heard when his program was run.

Other Examples: One of the highlights of our open day display was a music program running on the DS300. This machine has no loudspeaker - the four-part harmonies are picked up by an AM radio tuned to the rf interference generated by the core driver circuits. For best results, pull your PDP-8 processor cabinet right out and place the radio immediately above the core stack.
Resurrection, some kind of antique computer society []

Can't find the correct reference, try yourself to search the net for computer, music etc

Only Radio? (2)

AtrN (87501) | more than 12 years ago | (#2618190)

I programmed an Imlac [] and used to get audible sound out of the monitor when my lines got redrawn too fast. I always thought it was going to blow up.

Cool! (1)

david_e_v (42652) | more than 12 years ago | (#2618199)

This makes me think of Cryptonomicon's Van Eck phreacking references as something more than fiction.

range (1)

Ignimbrite (75711) | more than 12 years ago | (#2618205)

I got this to run with little difficulty.

Using my FT-817 with its 6m/50MHz antenna, Eliza at 50 MHz could be heard at least 15 feet from the side and front of my monitor. I would try the range in other directions, but I don't have room!

I was wondering why amateur radio reception was so poor in the dorm, and now I know why.

Legal issues (2, Interesting)

Pat__ (26992) | more than 12 years ago | (#2618220)

I don't know the range of this thing :)
But correct me if I am wrong ... Isn't it illegal to broadcast on AM frequencies without a licence in most parts of the world?

Re:Legal issues (1)

rob_horton (118331) | more than 12 years ago | (#2618260)

I guess it's only at a level which the monitor would be giving off anyway (the monitor presumably complies with the FCC regulations), just broadcasting something useful rather than white noise.

I think the music companies may have something to say about broadcasting mp3s if there is any range in it though!

Old News... My TRS-80 does this already :) (3, Informative)

Chmarr (18662) | more than 12 years ago | (#2618245)

Eh... old news. My TRS-80 Model I had a game who's instructions read:

For sound effects, place an AM radio next to your monitor

It was a car racing game... the sound effects made a kind of sense... except they didnt stop when you crashed the car :)

Re:Old News... My TRS-80 does this already :) (2)

jheinen (82399) | more than 12 years ago | (#2618285)

Yeah, I remember that. There were a number of games for the TRS-80 that used a radio for sound. One of my favorites was a space invaders clone. This was back in, oh about '77 I guess.

wow (1)

Iamthefallen (523816) | more than 12 years ago | (#2618251)

I thought nothing could beat hearing your Amiga 500 floppy drive play El Condor Pasa

Done it before on a TRS80 ModI (1, Interesting)

Chas2K (233963) | more than 12 years ago | (#2618259)

Trash80 hackers did something like this about 1979 - 80. We also had hacked some hardware to the expansion port to read RTTY and CW. In order to prevent RFI we pulled the case apart and lined it with foil then grounded the whole thing to suppress the noise. The trick is not to broadcast a radio signal but to prevent it. A CB neighbor came over because a Made in China PC switching power supply was blocking out his rig through the power lines. I tried everything from ferrite beads to bypass caps on all the lines and never fixed it. Bought a PS made in Taiwan and never had a minutes trouble since. A lot of the electronic parts coming in from China do not have to meet the FCC part 97, class B rules, or whatever the correct ruling is. Another sweet deal cut by the Feds to favor Chinese goods over American or other countries.

Wireless (2)

Faux_Pseudo (141152) | more than 12 years ago | (#2618263)

What I want to know is if you can use this as a means of wireless networking on the AM band. Now it wouldn't do any good for my laptop but I could use it for my two desktops to comunicate with. Anyone know where I can buy a AM reciver wireless network card?

So thats why... (1)

hound3000 (238628) | more than 12 years ago | (#2618290)

I was wondering why the kid with big braces at the end of the row in computer lab was jamming away, and really getting 'in' to our edutainment...

Traffic info... (1)

geschild (43455) | more than 12 years ago | (#2618297)

If you, like me, have your office not 25 metres from a high-way you can now wreak real havoc. Better yet, you now can put _your_ crapy, old, unshielded monitor to good use! It'll be pretty damn hard to track such a weak signal down with a lot of offices around and a bouncing, on/off signal.

Make sure you mangle your voice after recording your fake messages will you? No fun getting caught, besides you want to make yourself sound like a news-anchor.

(For the humor impaired: don't try this at home. Traffic kills more people than drugs.)
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