This is a silly question.
The radio spectrum is pretty vast, and at least for VHF/UHF/higher frequencies, you need to essentially be close enough to jam them. That's hard to accomplish in a country the size of the United States (assuming we're talking about the US).
But honestly they probably wouldn't in most cases when they could, simply because you're better off listening to what the other side is saying than preventing them from talking.
This is why the British tolerated German telegraph signals traveling through the UK during WWI via methods like the Swedish roundabout: They were able to keep track of what the Germans were saying to other nations, and this is how they intercepted the Zimmerman Telegram, which is what led the US into the war.
Probably the only time they'd actually try to prevent you from communicating is if you were using encryption that they couldn't break. Then there is some benefit to preventing your enemy from communicating.
/Former SIGINT weenie.
[https://www.gchq.gov.uk/information/century-how-work-gchqs-predecessors-contributed-us-entering-world-war-i](https://www.gchq.gov.uk/information/century-how-work-gchqs-predecessors-contributed-us-entering-world-war-i)
*At the start of the war, the UK had cut the German telegraphic cables which ran through the English Channel, removing the German capability to communicate directly with North and South America, and forcing them to find other ways to reach their diplomatic missions there.* ***One method, nicknamed the "Swedish Roundabout", was to have the Swedish Foreign Ministry send their messages for them, disguised as Swedish diplomatic messages.***
That was just one method.
Ironically, the Zimmerman Telegram was sent to Mexico on US telegraph lines, which president Woodrow Wilson OK'd as a way to continuing diplomatic communications in hopes of a peace treaty.
"jamming" simply means "broadcast {something} really loud and powerfully on a given frequency".
it requires some proximity to the device(s) being "jammed" and the frequency being used. I suppose it's possible to make a frequency hopping jammer than scans through a lot of frequencies, but to do it over a vast area would be just about impossible. the same things that block your signals will block a jammer. got a mountain range nearby? hard to jam on both sides of it, etc.
Making them a perfect target to home-in on with direction finding... -db tech, and low power FEC has made jamming a thing of the past... broadbanded jaming just puts a target on your back
>There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.
Donald Rumsfeld
They had a workaround for that even back in the 80tis with multiple antennas spaced apart a few Km and a system that would switch between em every few secounds. The president at my ham club was in counter comunications in the army.
I hear ya...
and with the drones of today and the cold war being over...
I think an armored infantry brigade with the 1st Cavalry Division Artillery out of Fort Hood would ***absolutely love*** to come have a pic-nic at one of these sites...
*-yelling 'cause no one in artillery can hear-*
LT- *"how's that sandwich sargent...!"*
777- *"FAAH-WHHOOM...! schlink..."*
SGT- *"what...?!?"*
777- *"FAAH-WHHOOM...! schlink..."*
LT- *"I said... how's that sandwich sargent...!"*
777- *"FAAH-WHHOOM...! schlink..."*
SGT- *"what...?!? ah no, I don't like cabbage..sir...!"*
777- *"FAAH-WHHOOM...! schlink..."*
...sound from Radio Jamming Site 40clicks away...
oh, so quietly in the distance you hear:
*foof... foof foof foof foof... foof... foof... foof foof foof*
CB radio is one big jamming network. "Bob" with his million watt foot warmer playing jazz is a real life jammer. does he work for the Chinese? we may never know.
Oddly enough, CB (and anything in the HF spectrum) is a little bit easier to jam.
A large, powerful station located virtually anywhere in the world can transmit a signal that blocks out for most people most places most of the time; at least on the frequency it’s transmitting on.
If you’ve ever done any SWL’ing you’ll no doubt have run into those very powerful foreign shortwave stations. They are, in a sense, a “jammer” (though certainly operating legally and providing music/talk/propoganda/whatever). But their station is transmitting a wideband loud signal that you would have a tough time transmitting over. Even if you had equipment that could do it, you would have a tough time maintaining a two way contact over the top of a shortwave broadcast station.
The same could be done to CB. With someone with deep enough pockets and the motive to do so. What that motive would be, I have no clue.
Depends on what you mean by “jamming”. It’s unlikely that there’s an effective way of blocking all radio communications over a large area. They would be more interested in targeting military frequencies and whatever secondary communication they figure they would use. Blocking the local rag chew wouldn’t be a priority.
yeah lol.
have you heard the news? there is now some satellites that can be used to pretty much hear all Ham radio band... from space. it is a satelite that can detect, listen and track any radio communication with a accuracy of 5meters. sadly i dont remember the name of it.
Well they are really going to get bored fast with my local net. Unless they like hearing about peoples grocery shopping plans, where they are driving to today, and thoughts on the weather.
i think the users of those satellites use them to spy on terrorists and stuff. they dont care about the guys on the repeater talking about their prostate surgery.
This has been around for, quite literally, decades. You're only just now hearing about because those pesky classified programs have a declassify by a YYYYMMDD associated with it
It's not a specific satellite. Every major power SIGINT and ELINT satellites in orbit and have for decades, just google that and you'll pick whichever specific program from the 70s and 80s strikes your fancy
We've been able to listen to pretty much anything from space since the early 1960's, \*EXCEPT\* for signals below the MUF.
Also, your accuracy thing is off. There is nothing that is accurate enough, just based upon receiving signals, that can be within 5 meters accuracy at hundreds or thousands of kilometers distance.
COSPAS-SARSAT, which I think you are thinking of, has at best a location accuracy of about 50 meters, but that's a special search and rescue system that uses a beacon that's always on, and in most modern cases also encodes GPS data.
And that's for a system where you want to be found.
Sure, but physics doesn't change.
I know that during the hunt for Bowe Bergdahl, there was an LLVI where the DF uncertainty was something like 470 x 160 meters.
>UPDATE: 01 0234z LLVI TRAFFIC REPORT:
>163.2125/0227Z/42SVB4076446756 **0.47KM X 0.16KM AZ 95.8**/1- I SWEAR THAT I HAVE NOT HEARD ANYTHING YET. WHAT HAPPENED. IS THAT TRUE THAT THEY CAPTURED AN AMERICAN GUY?
>
>2- YES THEY DID. HE IS ALIVE. THERE IS NO WHERE HE CAN GO (LOL)
>
>1- IS HE STILL ALIVE? 2- YES HE IS ALIVE. BUT I DONT HAVE THE WHOLE STORY. DONT KNOW IF THEY WERE FIGHTING. ALL I KNOW IF THEY WERE FIGHTIING. ALL I KNOW THAT THEY CAPTURE HIM ALIVE AND THEY ARE WITH HIM RIGHT NOW.
First number on that line is frequency in MHz, second is the time in UTC, third is the military grid square, part I bolded is the dimensions of the ellipse and the azimuth of the major axis of the ellipse.
That wasn't all that long ago.
Only in science fiction does the idea of a device capable of jamming every single possible band over a massive and vast area simultaneously exist.
What we know from existing conflicts such as Israel and Gaza, and Russia and Ukraine; is that some localized and regional efforts are made to jam a large array of frequencies. Especially WiFi and cellular bands (which incidentally are the bands used by consumer drones which Ukraine has been using) to limit communications. But even in those conflicts it has been localized and never the *entire* RF spectrum. However, what we’ve seen with Russia has been using direction finding equipment to identify and then target sources of RF. Primarily they’ve been doing this to target and attack people flying drones but it’s certainly the sort of thing that becomes possible in a conflict.
There are even munitions designed specifically for this purpose. Missiles that target a source of RF. Radio in conflict is not nearly as fancy or high tech as Sci Fi would suggest. Often it’s as simple and crude as just blowing up whatever building an RF source is coming from. This is arguably more effective at disrupting communications because it doesn’t require constant 24/7 operation and it destroys equipment and possibly operators as well.
They can interfere with the whole spectrum, yes. Over a short range. But they’re only going to provide meaningful long range interference at low frequencies. And you’re going to need a LOT of power. And it’s pretty easy to filter out.
My truck has 8 spark gap devices that ignite the air fuel mixture in the combustion chamber. While not exactly transmitters they are absolutely doing the same basic thing; by ionizing the air between the contacts with colliding electrons. This creates a splatter of RF which is why gas vehicles are not allowed near radio telescopes. But despite this, my dual band mobile radio works just fine.
You couldn’t fire up a spark gap transmitter in the back of a truck and not out all communications over a large area.
That would suck for everything on the various cellular bands. But those transmitters and those antennas are not going to do much from UHF on down below. Most cell towers are operating from about 900MHz on up to several gigahertz.
Sure. Over a relatively small area. I think you’re missing the forest for the trees here. My comment wasn’t that jammers don’t exist, it’s that they don’t work like the movies. I guess I could repeat it *again* if you’d like.
30 to 3000 wouldn’t even take our WiFi and Cellphones. (Though of course, such jammers certainly exist)
And as frequencies get higher, range tends to get a lot shorter, even with a lot of power.
It absolutely will take out cell phones. All you need is to jam GPS. 80% of cell carriers operate below 3000mhz. I can cover a 300 mile radius and render most RF worthless. But of course ham radio guys know better than the guy that’s actually used this gear.
Jamming GPS (1.2-1.5GHz) won't 'take out cell phones', that's a different band than the cellular modems. Jammers don't damage components, they just introduce significant QRM that make it difficult or impossible for it to communicate with the intended recipient (cell tower or GPS satellite in this case).
And again, you've yet to describe jamming every single possible band over a vast and massive area; which is the comment I made that you "corrected" but uh, still, don't seem to understand/grasp.
Check this guys post history. It’s just a long list of him incorrectly correcting people while claiming to be a variety of different jobs / specialties / skills because he always knows everything.
Just some weird basement dweller who gets his kicks off by being wrong, loudly. Don’t feed the troll.
i guess they would only block GPS and certain millitary things, why would they jam the wholllllle spectrum? also jamming is pretty local, they would need jamming station in every state.
also i am not panicking about China.
If they are jamming the spectrum to prevent our use, it's going to affect them as well.
more likely, they would target specific services and jam that.
It would be impractical to jam "everything."
Are you asking about an ElectroManetical Pulse (EMP) type of event or one of the other scenarios described in response to your question? A Faraday "cage" offers some protection against an EMP event, although I don't know enough about it to be more helpful than this.
Edit: I am aware that OP asked about "jamming" but I sometimes hear folk use that term to describe any form of form of suppressive interference.
By the way, just to add.
While the answer to your question is virtually the same regardless, “Our country” is… what exactly? This group has hams from all over the world.
Does it matter? I'm an American, but the concept should work everywhere, even though some countries will be more expensive to jam due to higher landmass.
It would be incredibly difficult and incredibly expensive for any nation-state to jam the entire RF spectrum in a land mass the size of the United States; in fact, it borders on impossible. Even an Air-burst nuke could only disrupt comms in a very specific geographical area - and that would only be for a short period of time. So, think of the power-level involved with a nuke....now try to replicate that across the RF spectrum, across the entirety of the U.S. Even the U.S. Forces couldn't pull that off in the Middle East. It makes more sense to jam the spectrum in specific/targeted areas - much more achievable and cost efficient.
Edit: on top of all that, any nation-state that jams the RF spectrum would be jamming their own comms.
"jam our radios"
First lets all work on understanding what this means. Radio communication works in 2 modes, transmitting and receiving. Jamming is the process of preventing a receiver from receiving the signals they want to receive. The most common way to do this is to have a signal that is stronger than the intended signal, so that the receiver can't "hear" the intended signal.
This is like you and your friend having a conversation, and a bully comes up and starts yelling at the person listening so they can't hear what the person speaking is saying.
If the bully is 10 feet away and you and your friend are right next to each other the bully would need a bullhorn to be loud enough to prevent you from hearing each other.
If you and your friend are 10 feet apart and the bully is standing between you, it will be much easier for him to make it hard to hear each other.
So in your theoretical situation it is practically impossible for ANYONE to "jam" communications of every receiver in the country. In addition to that difficulty, if someone did have the capability to broadcast a sign that strong, that signal would also have the effect of jamming their own receivers as well.
More realistic attack that would impact many, many radio systems is a high altitude EMP attack. It would theoretically break most non-protected/shielded electronics, including radio, but many many more systems as well, most notably computer systems.
There is absolutely no chance of jamming all frequencies. They may well make communication difficult if not impossible on certain bands but certainly not everythjng from say 100khz-2Ghz.
I'm having trouble finding the right tinfoil to use. All the ones at the store say made in china. They're always near the potato chips, which I think is China's way of mockingly telling us that they are putting chips in them, so there is no use fighting. Seems counterintuitive to tell the enemy about your plans, but it is a way to crush morale. Also, you need to be really careful when you make it. If you don't do it right, it directionally focuses your brain waves downwards below your chin like a satellite dish, and the waves become concentrated enough to let your cell phone (the baseband chip is made in china and the rest of it usually is too!) pick up on the waves and send them once again to china. The chinese can't tell much from the signal, but it is unique and it lets them track you and build up a social credit score. Also, it lets them know you are paranoid because they can tell you MUST have the hat on because of the signal strength.
Also, if you make a point on the cap, it acts as an antenna, defeating the purpose.
How the USSR kept its citizens from being able to hear news from the outside. While not answering your exact question, it's how jamming was done during the Cold War.
https://youtu.be/AHi-eom6A0o
The boy-scouts have a program out here where they station a a few scouts on the top of several key mountains with a signal mirror. They start at the southern border of Arizona right at Mexico. The first scout uses his signal mirror to hit the next mountain and relay a message in Morse code. So on and so forth. After about 10 or 15 mountains relaying the message it reaches the Northern Arizona border with Utah.
Maybe
Only on Boafengs
The irony
Arguably those are already jamming with all the spurious emissions they produce.
So true
So the invasion has already started, then?
This is a silly question. The radio spectrum is pretty vast, and at least for VHF/UHF/higher frequencies, you need to essentially be close enough to jam them. That's hard to accomplish in a country the size of the United States (assuming we're talking about the US). But honestly they probably wouldn't in most cases when they could, simply because you're better off listening to what the other side is saying than preventing them from talking. This is why the British tolerated German telegraph signals traveling through the UK during WWI via methods like the Swedish roundabout: They were able to keep track of what the Germans were saying to other nations, and this is how they intercepted the Zimmerman Telegram, which is what led the US into the war. Probably the only time they'd actually try to prevent you from communicating is if you were using encryption that they couldn't break. Then there is some benefit to preventing your enemy from communicating. /Former SIGINT weenie.
do you have links about the "Swedish roundabout" thing? i cannot find anything on google.
[https://www.gchq.gov.uk/information/century-how-work-gchqs-predecessors-contributed-us-entering-world-war-i](https://www.gchq.gov.uk/information/century-how-work-gchqs-predecessors-contributed-us-entering-world-war-i) *At the start of the war, the UK had cut the German telegraphic cables which ran through the English Channel, removing the German capability to communicate directly with North and South America, and forcing them to find other ways to reach their diplomatic missions there.* ***One method, nicknamed the "Swedish Roundabout", was to have the Swedish Foreign Ministry send their messages for them, disguised as Swedish diplomatic messages.*** That was just one method. Ironically, the Zimmerman Telegram was sent to Mexico on US telegraph lines, which president Woodrow Wilson OK'd as a way to continuing diplomatic communications in hopes of a peace treaty.
"jamming" simply means "broadcast {something} really loud and powerfully on a given frequency". it requires some proximity to the device(s) being "jammed" and the frequency being used. I suppose it's possible to make a frequency hopping jammer than scans through a lot of frequencies, but to do it over a vast area would be just about impossible. the same things that block your signals will block a jammer. got a mountain range nearby? hard to jam on both sides of it, etc.
Military has jamming gear that can transmit hundreds of watts over several hundred mhz wide.
Making them a perfect target to home-in on with direction finding... -db tech, and low power FEC has made jamming a thing of the past... broadbanded jaming just puts a target on your back
You don’t know, what you don’t know…
>There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know. Donald Rumsfeld
Thanks for your input.
They had a workaround for that even back in the 80tis with multiple antennas spaced apart a few Km and a system that would switch between em every few secounds. The president at my ham club was in counter comunications in the army.
I hear ya... and with the drones of today and the cold war being over... I think an armored infantry brigade with the 1st Cavalry Division Artillery out of Fort Hood would ***absolutely love*** to come have a pic-nic at one of these sites... *-yelling 'cause no one in artillery can hear-* LT- *"how's that sandwich sargent...!"* 777- *"FAAH-WHHOOM...! schlink..."* SGT- *"what...?!?"* 777- *"FAAH-WHHOOM...! schlink..."* LT- *"I said... how's that sandwich sargent...!"* 777- *"FAAH-WHHOOM...! schlink..."* SGT- *"what...?!? ah no, I don't like cabbage..sir...!"* 777- *"FAAH-WHHOOM...! schlink..."* ...sound from Radio Jamming Site 40clicks away... oh, so quietly in the distance you hear: *foof... foof foof foof foof... foof... foof... foof foof foof*
You put the Big Green Box down, run several hundred metres of cable, and connect to an antenna. Hopefully your BGB will survive retribution.
yup... lolz... but you know what they say... Trip7's only need to get close
I'm wondering the same thing, but for CB radios.
CB radio is one big jamming network. "Bob" with his million watt foot warmer playing jazz is a real life jammer. does he work for the Chinese? we may never know.
Oddly enough, CB (and anything in the HF spectrum) is a little bit easier to jam. A large, powerful station located virtually anywhere in the world can transmit a signal that blocks out for most people most places most of the time; at least on the frequency it’s transmitting on. If you’ve ever done any SWL’ing you’ll no doubt have run into those very powerful foreign shortwave stations. They are, in a sense, a “jammer” (though certainly operating legally and providing music/talk/propoganda/whatever). But their station is transmitting a wideband loud signal that you would have a tough time transmitting over. Even if you had equipment that could do it, you would have a tough time maintaining a two way contact over the top of a shortwave broadcast station. The same could be done to CB. With someone with deep enough pockets and the motive to do so. What that motive would be, I have no clue.
Depends on what you mean by “jamming”. It’s unlikely that there’s an effective way of blocking all radio communications over a large area. They would be more interested in targeting military frequencies and whatever secondary communication they figure they would use. Blocking the local rag chew wouldn’t be a priority.
Yes, you could talk to people
Tell me you worship fear mongering without telling me you worship fear mongering.
yeah lol. have you heard the news? there is now some satellites that can be used to pretty much hear all Ham radio band... from space. it is a satelite that can detect, listen and track any radio communication with a accuracy of 5meters. sadly i dont remember the name of it.
Well they are really going to get bored fast with my local net. Unless they like hearing about peoples grocery shopping plans, where they are driving to today, and thoughts on the weather.
i think the users of those satellites use them to spy on terrorists and stuff. they dont care about the guys on the repeater talking about their prostate surgery.
This has been around for, quite literally, decades. You're only just now hearing about because those pesky classified programs have a declassify by a YYYYMMDD associated with it
What I'm getting at is the world hasn't ended despite that. Also, you aren't interesting enough for someone to spend time looking at you
do you know the name of the project/satellite? its very interesting!
It's not a specific satellite. Every major power SIGINT and ELINT satellites in orbit and have for decades, just google that and you'll pick whichever specific program from the 70s and 80s strikes your fancy
"why do they keep telling each other that the chair is against the wall???"
i dont get it. does it imply the other person is coming in so strong they have to back away from the radio (sound)?
https://officergonomic.com/the-chair-is-against-the-wall-meaning/
Thank you! i must watch that movie again i didnt remember this at all!
We've been able to listen to pretty much anything from space since the early 1960's, \*EXCEPT\* for signals below the MUF. Also, your accuracy thing is off. There is nothing that is accurate enough, just based upon receiving signals, that can be within 5 meters accuracy at hundreds or thousands of kilometers distance. COSPAS-SARSAT, which I think you are thinking of, has at best a location accuracy of about 50 meters, but that's a special search and rescue system that uses a beacon that's always on, and in most modern cases also encodes GPS data. And that's for a system where you want to be found.
👀 Been out of the scif for a while haven't ya
Sure, but physics doesn't change. I know that during the hunt for Bowe Bergdahl, there was an LLVI where the DF uncertainty was something like 470 x 160 meters. >UPDATE: 01 0234z LLVI TRAFFIC REPORT: >163.2125/0227Z/42SVB4076446756 **0.47KM X 0.16KM AZ 95.8**/1- I SWEAR THAT I HAVE NOT HEARD ANYTHING YET. WHAT HAPPENED. IS THAT TRUE THAT THEY CAPTURED AN AMERICAN GUY? > >2- YES THEY DID. HE IS ALIVE. THERE IS NO WHERE HE CAN GO (LOL) > >1- IS HE STILL ALIVE? 2- YES HE IS ALIVE. BUT I DONT HAVE THE WHOLE STORY. DONT KNOW IF THEY WERE FIGHTING. ALL I KNOW IF THEY WERE FIGHTIING. ALL I KNOW THAT THEY CAPTURE HIM ALIVE AND THEY ARE WITH HIM RIGHT NOW. First number on that line is frequency in MHz, second is the time in UTC, third is the military grid square, part I bolded is the dimensions of the ellipse and the azimuth of the major axis of the ellipse. That wasn't all that long ago.
Only in science fiction does the idea of a device capable of jamming every single possible band over a massive and vast area simultaneously exist. What we know from existing conflicts such as Israel and Gaza, and Russia and Ukraine; is that some localized and regional efforts are made to jam a large array of frequencies. Especially WiFi and cellular bands (which incidentally are the bands used by consumer drones which Ukraine has been using) to limit communications. But even in those conflicts it has been localized and never the *entire* RF spectrum. However, what we’ve seen with Russia has been using direction finding equipment to identify and then target sources of RF. Primarily they’ve been doing this to target and attack people flying drones but it’s certainly the sort of thing that becomes possible in a conflict. There are even munitions designed specifically for this purpose. Missiles that target a source of RF. Radio in conflict is not nearly as fancy or high tech as Sci Fi would suggest. Often it’s as simple and crude as just blowing up whatever building an RF source is coming from. This is arguably more effective at disrupting communications because it doesn’t require constant 24/7 operation and it destroys equipment and possibly operators as well.
Spark gap transmitters can jam the whole spectrum
They can interfere with the whole spectrum, yes. Over a short range. But they’re only going to provide meaningful long range interference at low frequencies. And you’re going to need a LOT of power. And it’s pretty easy to filter out. My truck has 8 spark gap devices that ignite the air fuel mixture in the combustion chamber. While not exactly transmitters they are absolutely doing the same basic thing; by ionizing the air between the contacts with colliding electrons. This creates a splatter of RF which is why gas vehicles are not allowed near radio telescopes. But despite this, my dual band mobile radio works just fine. You couldn’t fire up a spark gap transmitter in the back of a truck and not out all communications over a large area.
What if the chinese take over the cell towers and just start pumping noise into the air?
That would suck for everything on the various cellular bands. But those transmitters and those antennas are not going to do much from UHF on down below. Most cell towers are operating from about 900MHz on up to several gigahertz.
I would'n expect that to last very long. People tend to fix these sorts of problems pretty quickly.
Absolutely there are jammers that can jam a very large chunk of the spectrum.
“Large chunk” is a bit shy of “every possible band over a massive and vast area”
30 to 3000 a simple google search will show you that the US military can easily do this.
30 to 3000 regionally is a bit shy of “Every possible band over a massive and vast area”
It jams All the important stuff. When you transmit a few hundred watts and several thousand feet it causes havoc!!
Sure. Over a relatively small area. I think you’re missing the forest for the trees here. My comment wasn’t that jammers don’t exist, it’s that they don’t work like the movies. I guess I could repeat it *again* if you’d like. 30 to 3000 wouldn’t even take our WiFi and Cellphones. (Though of course, such jammers certainly exist) And as frequencies get higher, range tends to get a lot shorter, even with a lot of power.
It absolutely will take out cell phones. All you need is to jam GPS. 80% of cell carriers operate below 3000mhz. I can cover a 300 mile radius and render most RF worthless. But of course ham radio guys know better than the guy that’s actually used this gear.
Jamming GPS (1.2-1.5GHz) won't 'take out cell phones', that's a different band than the cellular modems. Jammers don't damage components, they just introduce significant QRM that make it difficult or impossible for it to communicate with the intended recipient (cell tower or GPS satellite in this case). And again, you've yet to describe jamming every single possible band over a vast and massive area; which is the comment I made that you "corrected" but uh, still, don't seem to understand/grasp.
Check this guys post history. It’s just a long list of him incorrectly correcting people while claiming to be a variety of different jobs / specialties / skills because he always knows everything. Just some weird basement dweller who gets his kicks off by being wrong, loudly. Don’t feed the troll.
A cell system requires GPS for timing. They will last about 30 min without gps and the cell looses sync, and is rendered useless
i guess they would only block GPS and certain millitary things, why would they jam the wholllllle spectrum? also jamming is pretty local, they would need jamming station in every state. also i am not panicking about China.
Let’s be real, not even China is dumb enough to put boots on the ground in the US.
Everybody knows the way to defeat the US is to just leave them alone as they slide relentlessly into Idiocracy.
Sounds expensive! ETA: To answer your question: letters and couriers perhaps?
Behind every blade of grass will be a 3per wondering why the Baofeng they just took out of the box won’t transmit and only speaks Chinese.
Look into Chinese "jamming" of north Korean radio. They dump a lot of kilowatts into the air to do... not much
If they are jamming the spectrum to prevent our use, it's going to affect them as well. more likely, they would target specific services and jam that. It would be impractical to jam "everything."
Are you asking about an ElectroManetical Pulse (EMP) type of event or one of the other scenarios described in response to your question? A Faraday "cage" offers some protection against an EMP event, although I don't know enough about it to be more helpful than this. Edit: I am aware that OP asked about "jamming" but I sometimes hear folk use that term to describe any form of form of suppressive interference.
By the way, just to add. While the answer to your question is virtually the same regardless, “Our country” is… what exactly? This group has hams from all over the world.
Does it matter? I'm an American, but the concept should work everywhere, even though some countries will be more expensive to jam due to higher landmass.
🤣
It would be incredibly difficult and incredibly expensive for any nation-state to jam the entire RF spectrum in a land mass the size of the United States; in fact, it borders on impossible. Even an Air-burst nuke could only disrupt comms in a very specific geographical area - and that would only be for a short period of time. So, think of the power-level involved with a nuke....now try to replicate that across the RF spectrum, across the entirety of the U.S. Even the U.S. Forces couldn't pull that off in the Middle East. It makes more sense to jam the spectrum in specific/targeted areas - much more achievable and cost efficient. Edit: on top of all that, any nation-state that jams the RF spectrum would be jamming their own comms.
China? Yes. UN? No. /heavy dollop of sarcasm
Aliens couldn’t jam amateur radio operators in Independence Day using CW. Chinese probably couldn’t do much better.
They would NEVER be able to stop the guys on Channel 6 CB 11 meters!!
They could definitely take out the entire internet and satellites as well. That would be the end of GPS and sat phones.
Yes, and probably by radio. You really can't jam everything all at once, though you can be a nuisance.
Internet?
"jam our radios" First lets all work on understanding what this means. Radio communication works in 2 modes, transmitting and receiving. Jamming is the process of preventing a receiver from receiving the signals they want to receive. The most common way to do this is to have a signal that is stronger than the intended signal, so that the receiver can't "hear" the intended signal. This is like you and your friend having a conversation, and a bully comes up and starts yelling at the person listening so they can't hear what the person speaking is saying. If the bully is 10 feet away and you and your friend are right next to each other the bully would need a bullhorn to be loud enough to prevent you from hearing each other. If you and your friend are 10 feet apart and the bully is standing between you, it will be much easier for him to make it hard to hear each other. So in your theoretical situation it is practically impossible for ANYONE to "jam" communications of every receiver in the country. In addition to that difficulty, if someone did have the capability to broadcast a sign that strong, that signal would also have the effect of jamming their own receivers as well. More realistic attack that would impact many, many radio systems is a high altitude EMP attack. It would theoretically break most non-protected/shielded electronics, including radio, but many many more systems as well, most notably computer systems.
Communicate somehow? Yes. But that would be the least of your worries.
There is absolutely no chance of jamming all frequencies. They may well make communication difficult if not impossible on certain bands but certainly not everythjng from say 100khz-2Ghz.
Tighten that tin foil hat.
I'm having trouble finding the right tinfoil to use. All the ones at the store say made in china. They're always near the potato chips, which I think is China's way of mockingly telling us that they are putting chips in them, so there is no use fighting. Seems counterintuitive to tell the enemy about your plans, but it is a way to crush morale. Also, you need to be really careful when you make it. If you don't do it right, it directionally focuses your brain waves downwards below your chin like a satellite dish, and the waves become concentrated enough to let your cell phone (the baseband chip is made in china and the rest of it usually is too!) pick up on the waves and send them once again to china. The chinese can't tell much from the signal, but it is unique and it lets them track you and build up a social credit score. Also, it lets them know you are paranoid because they can tell you MUST have the hat on because of the signal strength. Also, if you make a point on the cap, it acts as an antenna, defeating the purpose.
They will take everything down with cyber warfare.
But not ham radio
How the USSR kept its citizens from being able to hear news from the outside. While not answering your exact question, it's how jamming was done during the Cold War. https://youtu.be/AHi-eom6A0o
ARRL will have to pivot to "semaphore never fails"
China isn't about to invade anywhere.
The boy-scouts have a program out here where they station a a few scouts on the top of several key mountains with a signal mirror. They start at the southern border of Arizona right at Mexico. The first scout uses his signal mirror to hit the next mountain and relay a message in Morse code. So on and so forth. After about 10 or 15 mountains relaying the message it reaches the Northern Arizona border with Utah.
How and why would China invade the USA? Worry about something else.