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How to Jam a Worldwide Satellite TV Broadcast

timothy posted about 11 years ago | from the next-on-the-diy-network dept.

Television 326

An anonymous reader submits: "According to an MSNBC article, 'it's simply a matter of aiming a strong signal at the uplink transponder on the satellite and overwhelming the...broadcaster's signals...You need a dish, some power, not too much. You put up a test pattern ... and do a sweep and find the transponder on the satellite you want to jam. It could even be smaller than the standard 6-meter dish. It could be a small dish with a lot of power.' This was apparently how an Iranian satellite television station was knocked off of Loral Skynet's TelStar-12 a few days ago. Loral contacted TLS, a company which specializes in satellite broadcast security, who quickly located the source of the jamming to Cuba."

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Wow, a Denial of Service attack (5, Funny)

Anonymous Coward | about 11 years ago | (#6423720)

How original. I hope someone doesn't try that on the internet.

Already been done here... (5, Interesting)

Rorschach1 (174480) | about 11 years ago | (#6423722)

See the story of Captain Midnight and HBO..

http://www.signaltonoise.net/library/captmidn.ht m

Re:Already been done here... (3, Interesting)

K8Fan (37875) | about 11 years ago | (#6423796)

I was watching at the time it happened. HBO likes to spin that the signal was never clear, and that the handled the interference quickly. My experience was that the signal he sent was every bit as clear as HBO's own signal. It's funny that it happened during "The Falcon & The Snowman", a film about a couple of Americans who become spys for the Soviets - and screw up royally.

Re:Already been done here... (1)

Old Uncle Bill (574524) | about 11 years ago | (#6423867)

The other thing to note, which made me suspicious of the MSNBC article, is that Captain Midnight used a MASSIVE dish with a LOT of power. Which, in the end, was the reason he got busted. The dish he used was a 30 footer. Could it be done with a smaller dish? Probably, but there are far more nefarious things that could be done with a dish than temporarily "knocking" someone off the air, or taking over their signal.

Re:Already been done here... (0)

Anonymous Coward | about 11 years ago | (#6423906)

...there are far more nefarious things that could be done with a dish than temporarily "knocking" someone off the air, or taking over their signal.

Such as? Pointing it at the moon and using your death rays to make it explode?

Cuba, eh? (4, Funny)

DoorFrame (22108) | about 11 years ago | (#6423724)

I know how to solve this problem... SANCTIONS! That'll show 'em.

Re:Cuba, eh? (1)

buysse (5473) | about 11 years ago | (#6423781)

You don't think that it came from Gitmo?

Re:Cuba, eh? (1)

Uber Banker (655221) | about 11 years ago | (#6423866)

Of course it did.

Re:Cuba, eh? (2, Funny)

Rolo Tomasi (538414) | about 11 years ago | (#6423783)

The hawks in congress must be pretty confused ... Cubans vs. Iranians - whom are we going to send the military aid?

Re:Cuba, eh? (2, Insightful)

SN74S181 (581549) | about 11 years ago | (#6423958)

The Iranian government must have sent the money to the Cubans, considering that the people in charge in Iran are the ones who generally seek to block access to outside news sources to their citizenry.

So I wouldn't call it 'Cubans vs. Iranians.' Just another example of Cuba exporting repression.

Re:Cuba, eh? (-1, Troll)

Anonymous Coward | about 11 years ago | (#6423789)

No, what we really need to do is get rid of that tin plated dictator once and for all.

Re:Cuba, eh? (0)

Anonymous Coward | about 11 years ago | (#6423798)

And we need to give the Iranians arms so that they can fight instead of just get kidnapped one by one by government thugs and executed.

Re:Cuba, eh? (1)

Uber Banker (655221) | about 11 years ago | (#6423877)

Like 'we' gave Osama and Saddam arms?

Re:Cuba, eh? (-1, Troll)

Anonymous Coward | about 11 years ago | (#6423811)

Judging from Iranian tactics, they just might set Cuba up the bomb.

Noooo! (3, Funny)

deman1985 (684265) | about 11 years ago | (#6423727)

This information can't leak out! We'll be subjected to Mystery Science Theatre 24/7! God save us all!

IF I EVER MEET YOU I WILL LICK YOUR ASS!!! (-1, Flamebait)

Anonymous Coward | about 11 years ago | (#6423729)

Obligatory Simpsons Quote. (4, Funny)

sweeney37 (325921) | about 11 years ago | (#6423732)

"And may God help you if that thing carried the Spice Channel."

-Moe Syzlak

ILLEGAL (-1, Flamebait)

Anonymous Coward | about 11 years ago | (#6423734)

This type of hacking is ILLEGAL. If you want to hack satellite units YOU MUST PURCHASE SAID UNIT. We are going to see that this website is taken down immediately. We will log IP addresses of anyone who visits this site and we WILL find you and prosecute you to the maximum extent permissible under the LAW.

Re:ILLEGAL (-1, Troll)

Gunsmithy (554829) | about 11 years ago | (#6423746)

What website are you referring to, Coward?

Re:ILLEGAL (-1, Offtopic)

Anonymous Coward | about 11 years ago | (#6423749)

MSNBC

Re:ILLEGAL (1)

Gunsmithy (554829) | about 11 years ago | (#6423760)

A cable news website? Like I'd go there in the first place. :P

Re:ILLEGAL (0)

Anonymous Coward | about 11 years ago | (#6423767)

Your computer is broadcasting an IP address and it has been logged. We will be sending a SWAT team to your location soon.

Re:ILLEGAL (1)

LethalSoul07 (688912) | about 11 years ago | (#6423778)

That is about the stupidest thing I have ever heard. Even if you were MSNBC there is nothing you could do to anyone posting on this website, other than doing something that is illegal. 0.o Suck on that one.

Re:ILLEGAL (0)

Anonymous Coward | about 11 years ago | (#6423790)

Thank you for your input. Your computer is broadcasting an IP address and it has been logged. We will be sending a SWAT team to your location soon.

Re:ILLEGAL (1)

LethalSoul07 (688912) | about 11 years ago | (#6423799)

::Is waiting::

Re:ILLEGAL (0)

Anonymous Coward | about 11 years ago | (#6423812)

The SWAT team is unable to pick you up right now. Please report to your nearest police station and turn yourself in. Thank you.

Re:ILLEGAL (1)

LethalSoul07 (688912) | about 11 years ago | (#6423828)

that's original...

Re:ILLEGAL (0, Flamebait)

Uber Banker (655221) | about 11 years ago | (#6423889)

You replied to this twice yet both times failed to see you were being wound up.

And that's just with your fresh troll account... you did it with Gunsmithy a lot more.

Re:ILLEGAL (0)

Anonymous Coward | about 11 years ago | (#6423898)

dood you are so kewl, defying the police and all

Re:ILLEGAL (1)

Gunsmithy (554829) | about 11 years ago | (#6423779)

OH NOS!!!

*downloads eight IP-blocker programs*

Re:ILLEGAL (-1, Offtopic)

Anonymous Coward | about 11 years ago | (#6423800)

If the SWAT team has not arrived yet, please remain at your location until they come to arrest you. They have to pickup LethalSoul07 first.

Re:ILLEGAL (0, Offtopic)

LethalSoul07 (688912) | about 11 years ago | (#6423815)

oh my god, they are in the back yard! oh wait... that was a cat. Never mind

Re:ILLEGAL (0)

Anonymous Coward | about 11 years ago | (#6423827)

I have given you instructions in another thread. Please do not cross-post, as this places you in further violation and could extend your prison sentence. Thank you for your cooperation.

Re:ILLEGAL (-1, Offtopic)

Anonymous Coward | about 11 years ago | (#6423927)

LOL

Please post non-anomymously so I can put you on my friends list.

Re:ILLEGAL (1)

Infinite93 (664963) | about 11 years ago | (#6423809)

Obviously they are referring to the site with the instructions. ::Patiently waiting for them to shut down MSNBC and EVERY IP that has attached to it::

timothy == good, michael == bad (2, Funny)

Anonymous Coward | about 11 years ago | (#6423736)

Taco... fire michael, promote timothy, and then take a sabbatical and let someone else run the show for a while, until you get some passion for the job and stop hating the readers so much.

Thank you.

Regards,

Hank Kingsley

Re:timothy == good, michael == bad (-1, Troll)

Doomrat (615771) | about 11 years ago | (#6423982)

Don't fire Micheal, just fuck him in the butt until he bleeds. Slice him open and use an electric whisk on his insides. Cut his nipples off and force feed them to him. Take photos. THEN Slashdot would be worth looking at.

Dangerous (5, Funny)

Flamed to a Crisp (688872) | about 11 years ago | (#6423739)

This could get very very dangerous. Imagine if some terrorists got ahold of a dish (not very hard these days) and knocked out some vital communication systems. Chaos! Our only hope is that since the instructions have been Slashdotted, the terrorists can't get through.

Re:Dangerous (1)

compwiz3688 (98919) | about 11 years ago | (#6423774)

So we should make a dupe of this story.

That's not enough... we need to flood the story submission database with this story :).

Re:Dangerous (1)

AllUsernamesAreGone (688381) | about 11 years ago | (#6423873)

Yeah, like you need to be a genius to work out you can do this...

Re:Dangerous (1)

NeoSkandranon (515696) | about 11 years ago | (#6423900)

This could get very very dangerous. Imagine if some terrorists got ahold of a dish (not very hard these days) and knocked out some vital communication systems

You mean like CNN?

The tricky thing is.... (5, Interesting)

PS-SCUD (601089) | about 11 years ago | (#6423741)

How do you make this illegal? If they can beam their signal onto your house, why can't you beam yours at them?

The even more tricky thing is: (3, Interesting)

Anonymous Coward | about 11 years ago | (#6423772)

Once you make it illegal, how do you stop people from simply doing it from Cuba (as the jammers in the article did)? Satellites, it doesn't really matter what country you're in if you want to contact them.. that's their strength, but..

Re:The even more tricky thing is: (4, Interesting)

SagSaw (219314) | about 11 years ago | (#6423870)

You don't even have to be in a country. Nothing would stop you from doing this from a boat in international waters. It really wouldn't have to be that big of a boat either.

Re:The even more tricky thing is: (0)

Anonymous Coward | about 11 years ago | (#6423951)

depends on where the boat is registered doesn't it - it's not that there are no laws in international waters it's just that you carry yours with you and enforcement is spotty

Re:The even more tricky thing is: (3, Insightful)

mesocyclone (80188) | about 11 years ago | (#6423975)

Nothing like an aircraft carrier and a jet carrying a HARM (High Speed Anti-Radiation Missile) to take care of that problem.

Re:The tricky thing is.... (2, Insightful)

mrseigen (518390) | about 11 years ago | (#6423787)

They're megacorporations. They can do whatever [riaa.org] the [mpaa.org] hell [microsoft.com] they want.

+2 interesting?!? (1)

imsabbel (611519) | about 11 years ago | (#6423788)

Well, there is something like licences for usage of frequency bands.
Somebody being allowed to do something doesnt equal EVERYBODY being allowed to do it.

Re:The tricky thing is.... (1)

jovlinger (55075) | about 11 years ago | (#6423807)

You need a license to transmit at all on many bands.

Hrm. That can't be right, because my PC was transmitting on FM radio bands just a few years ago (which would explain why 101.7 FNX started sucking right after I upgraded to a Duron from my old pentium). And I used to have this killer wireless mike that transmitted on commercial frequencies (imagine the fun to be had with a little sister...)

So maybe there is a threshold of a few milliwatts. anyways, you CANNOT reverse the stream and send DirectTV your homemade porn without someone throwing the book (of FCC regulations -- much heavier than the book of law) at you.

Re:The tricky thing is.... (1)

bhtooefr (649901) | about 11 years ago | (#6423952)

Well, that IS a violation. Did you build the PC yourself? If so, YOU (and maybe AMD) violated Part 15 of the FCC rules.

(typed off the back of an old clicky keyboard)
This device complies wiht part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. And (2) This device must accept any interference received, including interference that may cause undesired operation.
Therefore, your box is violating Part 15-1, but your radio is in complete compliance with Part 15-2.

Re:The tricky thing is.... (1)

heli0 (659560) | about 11 years ago | (#6423824)

How do you make this illegal?

Why can't you broadcast a 50MW 95.5MHz signal from your home? A little thing called the FCC.

Re:The tricky thing is.... (0)

Anonymous Coward | about 11 years ago | (#6423907)

Oh, yes, right, I forgot, the FCC is an international organisation that oversees every country's airwaives...

Re:The tricky thing is.... (5, Funny)

heli0 (659560) | about 11 years ago | (#6423954)

The international enforcement arm of the FCC is the DOD.

MSNBC giving out hacking instructions?? (5, Funny)

Anonymous Coward | about 11 years ago | (#6423743)

Funny, the other divisions of MS seem to think it's some kind of horrible, immoral, illegal thing when you describe how to hack hardware. What happened to "very committed to respect for others' intellectual property and we request the same respect applied to our innovations"?

Re:MSNBC giving out hacking instructions?? (1)

SN74S181 (581549) | about 11 years ago | (#6423969)

Here's your cookie for posting the obligatory anti-Micro$oft comment on an unrelated topic.

At first I thought the title said..... (0)

Anonymous Coward | about 11 years ago | (#6423744)

"How to Jam With a Worldwide TV Broadcast"

Jam on it. Ja-j-j-ja-j-j-jam on it....

Okay, I'm high.

At first _I_ thought the title said (0)

Anonymous Coward | about 11 years ago | (#6423759)

At first _I_ thought the title said, "Doom 3 progess report" but then I realised that I wasn't reading slashdot at all.

uh oh (1)

bucklesl (73547) | about 11 years ago | (#6423754)

...was knocked off of Loral Skynet's TelStar-12 a few days ago.

Let the Terminator jokes commence

OMFG! (0)

Rolo Tomasi (538414) | about 11 years ago | (#6423757)

Radio signals can be jammed! What are we gonna do?!?!?

*yawn*

In other news.... (4, Funny)

mrpuffypants (444598) | about 11 years ago | (#6423758)

In other news, DirecTV was knocked off the air permanently for unexplained reasons today.

Comcast, AOL/TW, and Cox all declined to comment.

The explanation (0)

Anonymous Coward | about 11 years ago | (#6423910)

> In other news, DirecTV was knocked off the air
> permanently for unexplained reasons today.
>
> Comcast, AOL/TW, and Cox all declined to comment.

Just then, an image of bald man dressed in an evil overlord garb appears on the screen and announces.

"Do not bother to change channels. We control all of them.

There is a nuclear device under each major city around the world. I know you don't believe me so I have taken the liberty of blowing up an insignificant city -- Hollywood California. No-one will miss Britney Spears, the new "Battlestar Galactica", or "The Brady Bunch, Next Generation".

Our request is simple. Your governments must submit their authority to our new ancient overlord masters or we will continue to detonate one bomb every day until with you surrender or until the only thing capable of living in your country are the roaches and lawyers.

All hail our new overlord masters!"

The TV goes to static for a moment before displaying, "Sorry for the technical difficulties. We now return you to a very special episode of 'Saved by the bell'".

This is critical (-1, Troll)

Anonymous Coward | about 11 years ago | (#6423761)

Many of you are against jamming digital television signals because of some ephemeral notion of your "natural right" to fair use, as though fair use weren't an artifact of positive law (passed by Congress) in another act of positive law (copyright law itself). But let's assume for a moment that you're correct, that there is a fundamental right here that's being abused. I'll grant you that, if you think it'll help your case. But it won't, and I'll tell you why.

Rights aren't absolute, no matter what Ronald Dworkin tells you. Your right may trump my interest, but your right cannot trump my right; trumps cannot trump each other without reference to a hierarchy of trumps (which is lacking in this instance).

That's all well and good, you say, but how is it relavent here? What right of mine are you abridging by having this turf-war with the television industry? Why, the most fundamental right of all: the right to continue existing without molestation by other moral agents.

You see, it is critical that digital television be jammed. Every second of every minute of every hour of every day, television signals are being broadcast from our television satelites to our homes, but not just to our homes, no. Into outer space.

There is an archaeological record of our daily human experiences being broadcast to extraterrestrials as we speak. Forget Species. The greatest horror won't be when aliens get our DNA sequences; it'll be when they get our reruns. Some time in the distant future, an intrepid band of extraterrestrial warriors will reach that distant blue planet that has been polluting their atmosphere with high-frequency radio signals, and they will know exactly how to destroy us at our precise weak spots; for they will have studied the Three Stooges ("Poke 'em in the eye!") and Survivor ("Give 'em money and they'll self-immolate!").

It will be a bleak day for humanity, and I will not countenance any industry policy that allows it to transpire. It is critical that we take steps today to jam our television signals so that if they ever fall into enemy hands, they will appear like mindless garbage and a waste of time to try to comprehend.

Thank you.

Jammed? (1, Redundant)

I Like Swords!!! (668399) | about 11 years ago | (#6423763)

"I've lost the sweeps. I've lost the bleeps. And I've lost the creeps."

"...That's not the only thing he's lost."

"Look, sir! It appears that we're being jammed."

"Raspberry... There's only one man who would DARE give me the raspberry..."

... errr, yeah. Jamming satellites, that's the topic. Sorry, still waking up.

Re:Jammed? (-1, Redundant)

Anonymous Coward | about 11 years ago | (#6423921)

woot spaceballs!

But... (1)

jabbadabbadoo (599681) | about 11 years ago | (#6423770)

...can I jam spesific broadcasts, such as, say... "Good Morning, Miami"?

Aw ah...Uh huh! (3, Funny)

da3dAlus (20553) | about 11 years ago | (#6423782)

"Not if we JAM IT!"
"Ah ha!"
"Down scope."
"Down scope!"
"Radar...about to be...JAMMED!"

muhaha! (5, Insightful)

wfmcwalter (124904) | about 11 years ago | (#6423793)

it's simply a matter of aiming a strong signal at the uplink transponder on the satellite

Worse, send a really powerful signal (read- military radar magnetron hooked up to mondo dish) and you can permanently fry that transponder, and do so with a burst so brief and directed that it's not terribly easy for anyone to figure out whonunnit. It's a great piece of asymetric information warfare - spend a couple of million dollars to knock out a few dozen civilian comsats, each tens or hundreds of millions of dollars worth. Best of all, it's quite possibly not in breach of any international treaty !

Excuse me, I have to go now, my mechanical pirnahas are hungry...

whonunnit? (0)

Anonymous Coward | about 11 years ago | (#6423802)

That sounds like a murder mystery in a convent!

(sorry, I'll stop now)

Re:muhaha! (0)

Autolycus (151640) | about 11 years ago | (#6423837)

Shhhh.... you'll give Osama & pals ideas!

Does this mean that everytime I buy a transistor or other RF parts that I'l gave to go through a background check?

Re:muhaha! (0)

Anonymous Coward | about 11 years ago | (#6423855)

I have to go now, my mechanical pirnahas are hungry...

what's a pirnaha?

Re:muhaha! (0)

Anonymous Coward | about 11 years ago | (#6423875)

>>>with a burst so brief and directed that it's not terribly easy for anyone to figure out whonunnit.

Just use a generator in a van, park in the satellite owner's worst competitor! An anonymous call of "suspicious activity on the roof" 24 hours later could add to the fun.

cool , but much cooler things can be done (DSS!) (5, Interesting)

pigscanfly.ca (664381) | about 11 years ago | (#6423808)

such as using the transponders to carry your own signal . Most sat tv satelites are essnetially dumb transponders , which means (essentially) they receive a signal on one end and pump it out the other end . What is cool is that using DSS (direct sequencing spread spectrum) you can transmit your own data and people will think that it is background noise . I beleive correctly some russians were doing this awhile back and it went on for a couple of years before they got caught.

Damn script kiddies (1)

aardwolf204 (630780) | about 11 years ago | (#6423810)

Pinging nitv.tv with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for nitv.tv:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)


Damn script kiddies

Re:Damn script kiddies (1)

caluml (551744) | about 11 years ago | (#6423916)

bash-2.05b$ ping -c 4 www.microsoft.com
PING www.microsoft.akadns.net (207.46.249.222) 56(84) bytes of data.

--- www.microsoft.akadns.net ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3012ms

bash-2.05b$

What's your point?

Logistically hard (3, Funny)

gilesjuk (604902) | about 11 years ago | (#6423813)

You need a huge knife and gallons of jam.

Hah! That's nothing. (4, Funny)

Talisman (39902) | about 11 years ago | (#6423814)

I work as a communications officer aboard a ship. We pulled into Cape Town on day 1 of the World Cricket Championships. One of the games was being broadcast nearby, until our active radar filled the air with distortion.

The second the gangway hit the deck, two sweaty, panicked cameramen came charging up, asking to speak to me. I was already at the gangway because I needed to meet a technician.

"You have to turn off your radar! We're broadcasting the World Cricket Chapmionships LIVE AND YOU KILLED OUR SIGNAL!"

Me: "Oh. Who's playing?"

Them: "Pakistan and Bangladesh."

Me: "Pakistan, eh? Yeah, I'll turn it off ASAP."

And 20 minutes later, I did ;)

For any of you gusy that were watching that game, sorry.

Kinda ;)

Tal

Re:Hah! That's nothing. (1)

sik puppy (136743) | about 11 years ago | (#6423854)

The Italians have a radar system (their equivalent of aegis, I believe) that wipes out marisat communications. I had to tell the captain he'd have to wait til that cruiser got far enough away before he could talk to the office.

Re:Hah! That's nothing. (4, Interesting)

Talisman (39902) | about 11 years ago | (#6423890)

We were sailing off the coast of Spain once and the Spanish Navy was running military exercises nearby. They had a jammer that scrambled GPS signals, in this case by stripping out all the Westward coordinates.

The navigational system that shows the ship superimposed on a map by using a GPS feed had us squarely in the center of the Sahara :)

The ex-Soviet republics are _THE_WORST_ for radar interference. I swear they think someone is going to launch an attack on them every minute of the day. NOTHING but an orgy of signal jamming/scrambling when you get near their coasts. C-Band, INMARSAT, GPS...all yolked.

Tal

Re:Hah! That's nothing. (1)

Vlad_the_Inhaler (32958) | about 11 years ago | (#6423938)

Which coasts are you talking about?
Ignoring the Arctic coastline (virtually uninhabited and pretty inaccessible), Russia has a small area of coast around St Petersburg (Leningrad) and a larger expanse between Vladivostok and the Alaska area.

The rest is landlocked.

Re:Hah! That's nothing. (1)

Lieutenant_Dan (583843) | about 11 years ago | (#6423948)

He probably means Latvia, Estonia and Lithunia.

Re:Hah! That's nothing. (1)

Lieutenant_Dan (583843) | about 11 years ago | (#6423961)

Err, sorry, meant to type "Lithuania". My apologies to all the folks at the Vilnius University .

Re:Hah! That's nothing. (3, Funny)

dr3vil (604180) | about 11 years ago | (#6423979)

No problem. In any given twenty minutes of a cricket game, the chances that anything actually happened are pretty low.

specializes in satellite security (1)

jovlinger (55075) | about 11 years ago | (#6423822)

Now does that sound like a cool job, or what?

It's one of those industries I didn't realize there was a niche for.

Countermeasures (5, Interesting)

td (46763) | about 11 years ago | (#6423823)

As has been pointed out, people have been jamming satellite uplinks since Capt Midnite & HBO. So why haven't the satellite folks gone to jam-resistant technology? (I know, it's because of the essential laziness of corporate culture -- geez, it was a rhetorical question.) Spread spectrum is essentially unjammable, if done right (i.e. with cryptographically generated spreading sequences or some such cryptogeek mumbojumbo.)

Re:Countermeasures (4, Informative)

LostCluster (625375) | about 11 years ago | (#6423899)

Spread spectrum is essentially unjammable

Huh? By definition, spread spectrum bounces all over the given band of frequencies in some predetermined patern. It makes it a bit harder to jam, because you'd have to cover all of the frequencies with the jamming signal, but not impossible if the attacker can just jam the whole frequency range.

Furthermore, spread spectrum makes things a whole lot harder on the transmitters on the ground. Let's use a simple example, imagine a satellite with channel space for 6 upbound signals coming from 6 different TV networks that are located at 6 different studios. In simple frequency division, they'd each get 1 slot of bandwidth, and so long as nobody retunes their transmitter to somebody else's frequency it all works. But, in spread spectrum, they'd each be all over the band... unless coordination was very tight between the spreading patern, the 6 sources would keep jamming each other by being on the same frequency at the same moment... you'd need a ton of retransmitting and error correction to get around that.

Re:Countermeasures (5, Informative)

Detritus (11846) | about 11 years ago | (#6423904)

The problem is that transponders are relatively simple devices. They receive a band of frequencies and retransmit those frequencies on another band. Anything in the uplink passband is duplicated in the downlink passband. The transponder can be jammed simply by putting a very strong unmodulated carrier in the uplink passband. This hogs all of the power available in the downlink section of the transponder, leaving little or no power for the legitimate users.

A sophisticated antenna system will provide steerable nulls in its radiation pattern. Once the source of the interference is localized, the antenna can be adjusted to place the null over the source of interference.

Hmmmm (1)

Anonymous Coward | about 11 years ago | (#6423825)

...who quickly located the source of the jamming to Cuba.

Why would Cuba want to block Iranian TV? Is there another country who doesn't like Iran that has a presence (or a large base) in Cuba?

Re: why (1)

Typoboy (61087) | about 11 years ago | (#6423930)

Hmm, according to the article, Iran itself may have requested the block of Persian-language transmissions coming out of the US.

Mandatory T3 joke. (1, Funny)

tcc (140386) | about 11 years ago | (#6423826)

> Iranian satellite television station was knocked off of Loral Skynet's TelStar-12

And so it begins... Skynet has become self-aware... and picked a country that supposedly has loads of WMD and terrorists. Guess even AI can be fooled :)

Umm... How'd they figure out Cuba? (0)

Anonymous Coward | about 11 years ago | (#6423833)

Anyone care to explain the technical bits of how they figured out the signal came from Cuba? I'd umm... just like to know for future ah... reference.

DMCA Violation!! (4, Funny)

heli0 (659560) | about 11 years ago | (#6423846)

How to Jam a Worldwide Satellite TV Broadcast

"According to an MSNBC article, 'it's simply a matter of aiming a strong signal at the uplink transponder on the satellite and overwhelming the...broadcaster's signals...You need a dish, some power, not too much. You put up a test pattern ... and do a sweep and find the transponder on the satellite you want to jam'."

So who from Microsoft or General Electric is going to prison for this DMCA violation?

Signal Replacement (2, Funny)

HeX86 (536126) | about 11 years ago | (#6423852)

C'mon, lets get creative, instead of blocking out boring TV, lets replace it with eppisodes of Mystery Science Theater 3000 or something.

Think creative!e

Cool... Reason to attack Cuba.. (1, Flamebait)

A Commentor (459578) | about 11 years ago | (#6423878)

I bet Bush sees this as justification to now attack Cuba... Cuba is attacking our right to free speech being blasted into Iran. Time for another 'justified' U.S. attack. ;-)

Pirate radio, satellite style. (0)

Anonymous Coward | about 11 years ago | (#6423887)

I've often wondered if it would be possible to "pirate" an unused audio channel on a satellite. Do the companies switch off unused channels, or is it simply a transponder for a range of frequencies? It would be hard to locate (not sure how these guys were located to Cuba), and it would be a Europe wide pirate radio station.

The Running Man (1)

iamjim (313916) | about 11 years ago | (#6423891)

Umm, Didn't we all learn this watching The Running Man?

"Uplink underground, uplink underground. If you say that one more time, I'll uplink your uplink your ass, and you'll be underground!"

How to find out the location of a jammer? (2, Interesting)

Psychic Burrito (611532) | about 11 years ago | (#6423923)

Can somebody tell me how the source of such a jamming can be found? The satellite's receiver doesn't have a locator from which direction it is receiving something from, doesn't it? So how is it done? Thanks!

Re:How to find out the location of a jammer? (5, Informative)

Conor (2745) | about 11 years ago | (#6423990)

According to company website they use radio interferometry. To do this they need another (relatively) nearby satellite with a similar transponder, which also sees some interference. Then they measure the arrival time difference between the signals bounced from the two satellites, using this they can then triangulate the position to within a few miles.

If you pay them lots of money they'll send out helicopter
(assuming its not in Cuba!) to find the exact antenna causing the problem.

countermeassurement? (-1)

broeman (638571) | about 11 years ago | (#6423949)

Found this on the Iranian newssite: disturbance filter [www.nitv.tv]

I don't understand arabic or iranian (I don't even know what language it is!) so, what is this about? looks like a condom for a LNB.

Done in The Sum of All Fears... (0)

Anonymous Coward | about 11 years ago | (#6423950)

...the story in the original book, [amazon.com] not the watered-down screenplay for a Ben Affleck vehicle that it became.

Energy from the nuke the terrorists set off at the Super Bowl reacted interestingly and unexpectedly with comm satellites, via the satellite trucks at the site. It fried them.

It's been jammed! (-1, Troll)

Anonymous Coward | about 11 years ago | (#6423988)

BARF. Oh, you're right, and when you're right, you're right, and you, you're always right. Okay, we save her, but how? The minute we move in there, they're spot us on their radar.

LONE STARR. Uh-uh.

BARF. Uh-huh.

LONE STARR. Uh-uh.

BARF. Uh-huh.

LONE STARR. Uh-uh, not if we jam it.

BARF. Ah, ha! You're right.

LONE STARR. Down scope.

BARF. Down scope.

(The scope comes down. BARF looks through the scope and focuses on the radar.)

BARF. Radar, about to be jammed.

EXT. SPACEBALL 1 - SPACE
(Jam comes flying and crashes the radar.)

INT. SPACEBALL 1 - SPACE
(The radar is screwing up. The RADAR TECHNICIAN is trying to figure out the problem.)

RADAR TECH. (he is making the sound effects) Shit. (makes more sound effects and dials phone) Sir? (in microphone)

COL SANDURZ. What is it?

RADAR TECH. (O.S.) (in microphone) Can I talk to for a minute, please, sir.

COL SANDURZ and DARK HELMET (walk over to him)

COL SANDURZ. Well.

RADAR TECH. (in microphone) I'm having trouble with the radar, sir.

COL SANDURZ. You don't need that, Private, we're right here. (hangs up microphone) Now, what is it?

RADAR TECH. (in microphone voice) I'm having trouble with radar, sir.

DARK HELMET. (rips out the microphone-mask up) Now, what is it?

RADAR TECH. I'm having trouble with the radar, sir.

DARK HELMET. What's wrong with it?

RADAR TECH. I've lost the bleeps, I've the lost the sweeps, and I've lost the creeps.

DARK HELMET. The what?

COL SANDURZ. The what?

DARK HELMET. And the what?

RADAR TECH. You know. The bleeps, (makes bleeps sounds) the sweeps, (makes sweeps sounds) and the creeps. (makes creeps sounds)

DARK HELMET. (to Sandurz) That's not he's lost.

RADAR TECH. Sir. The radar, sir. It appears to be....(Jam starts dripping down the screen.)

RADAR TECH. ....jammed.

DARK HELMET. Jammed? (takes a taste of the jam) Raspberry. There's only one man who would dare give me the raspberry. (pulls down mask) Lone Starr!

Your comment has too few characters per line (currently 22.2). Your comment has too few characters per line (currently 39.9). Your comment has too few characters per line (currently 39.8).
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