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dinscurge

frequency jamming

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wondering if anyones had any experience with those multiple frequency jammers like they have on dx ?

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I haven't used any of their jamming products, but if you have a few dummy load resistors and an oscilloscope or true RMS meter that will measure accurately in the desired frequencies, you can easily verify their claims. It's just a matter of pumping out enough interference to be significantly "louder" than what you want to jam at the radius to which you want to jam.

 

Probably a FCC violation since you'd be intentionally causing "harmful" interference.

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FCC violation and lawsuit material. Marriot got fined almost 1 million dollars by the FCC for jamming 802.11 frequencies so guests had to use their paid WiFi. That was just from the FCC on a public frequency.

 

I could picture Feds in suits if an emergency worker complained to the FCC.

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most all likely since they broadcast on cellphone frequencies and such. was mostly just wondering since i have tmobile it wont even work got 1700 and such :P

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IDK, You said multiple frequency. I was just thinking randomly jamming random frequencies could result in immediate suits. Especially if someone lives by an airport, military installation, police station, etc...  

 

I know you wouldn't do that, Dins. But other people reading the forums might not realize the FAA, police, ambulances, military, etc... have RF space to themselves. LoL

Edited by tekio
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they are like shortrange like 10feet if even cellphone/gps/ 2.4ghz wifi, like one is 3 bands for phone and then 2.4ghz has antenna for each frequency/range and everything

 

edit: i guess a example would be a gps only one people could get if they purchase new vehicles if they are paranoid about being tracked or whatever

edit2: link http://www.dx.com/p/qh-2-cellphone-wi-fi-signal-generator-module-blue-147916 has the surface mount trimpots so you can adjust thru the ranges

Edited by dinscurge
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That can be used for a lot more than 10ft. I'm not gonna say how, just because no good intentions would require using for more than 10 feet.

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Heh, those look like 3 dB rubber duck antennas, it's probably good for 10 feet *without* the antennas.

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Haha! There's a thing called "gain". 

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well generally they state distance as almost the theoretical maximum in line of sight perfect weather etc and then its deal extreme so, imagine for say ham if you had a counterfeit baofeng/pofung radio probably the specs are not as reliable as other higher end "equivilents". if i had to guess id probably be that realistically works good like half the stated range. to where your not gonna lord over your culdesac or anything the apartment next to yours is a different story

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Probably a FCC violation since you'd be intentionally causing "harmful" interference.



This. It's perfectly okay for the gommint to do it of course, being above the law and immune to backlash and criticism as they are, but they get really pissy when they find you've been playing with "their" toys that you bought and paid for out of your own paycheck (or building and using functional equivalents). Ain't Amerika great?

There was once a surplus store around here with a rather creative, if sadly true slogan. "Selling your income tax dollars back to you".

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10 hours ago, scratchytcarrier said:

 


This. It's perfectly okay for the gommint to do it of course, being above the law and immune to backlash and criticism as they are, but they get really pissy when they find you've been playing with "their" toys that you bought and paid for with your own money (or building and using functional equivalents). Ain't Amerika great?

There was once a surplus store around here with a rather creative, if sadly true slogan. "Selling your tax dollars back to you".

would always assume its violation much like when people use hand held ham scanners as walkie talkies, even know a group of people that has repeaters even with none of them having a ham license but i guess nothins happened yet. ( not that, thats telling me to do this or anything) mainly going of the assumption that it would be like buying an ebay chinese no name powersupply, basically dont expect it to last at the rated power for even a couple seconds, the antennas although im sure might help if they are actually proper lengths but, is probbaly more so it looks like it does something besides the comments.

did they not get enough government funding and have to close?

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Probably depends on the channel. An FAA, emergency, or even public communications channel would probably draw quicker attention than 2.4Ghz or 5.2Ghz. LoL

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Yeah, you'd think.

want to know a fun way to kill a Saturday? Get hold of a wideband spectrum analyzer and drive around neighborhoods with it, particularly in cities where the local cable monopoly is called "Comcast". Even better, take your SA and hang out near hotels that you know have their own private cable systems (as opposed to just a direct connection to the local public cableco trunk) (mostly higher-end chains.) Private hotel systems frequently are built on the cheaper-than-ultra-cheap and often are still mostly if not entirely NTSC-based. With as much leakage as some of these systems have it's a wonder more hotel chains don't get hammered in the ass by the FCC. Assuming the hotel or public system is near a major airport and using the standard cable bandplan, it's always telling if they have progrmaming in channels 14/15/16/98/99 since these overlap the airband (109-136 MHz), and 23-56 inclusively which overlap ham radio/military/government communication bands.

In fact you don't even need that fancy equipment. If you have a police scanner, next time you check into a hotel that has a private cable system, just blind-search VHF and UHF for a few minutes before you go to bed and note how high the TV noise floor is. If they still have a pay movie server (like a leftover On Command or ancient Lodgenet system that they managed to keep up somehow) and you hear lots of sensual moaning in the middle of 70cm, you know you hit gold, mmmm baby. It's easy to pick this stuff out from today's local broadcast stations because (1) they often fall outside the terrestrial TV bands and (2) broadcast digital TV channels just sound like really loud static on analog radio tuners ("haystacks" on a spectrum analyzer display). Especially if it's an older hotel like the Red Lion in Pendelton for example, which has probably one of the leakiest cable systems I've ever heard in the 300-400 MHz spectrum. Most or all of its infrastructure probably dates to the mid 70s when the place was built and wasn't meant to handle anything above VHF anyways. (Under KKR ownership (mid 80s-about 1996) they insisted all the Red Lions have "Hospitality Network" systems, which was all VHF, and god knows what they had before that, under Pietz & McClasky.)

In many areas comcast is the incumbent coaxial TV monopoly. Comcast bought out my area's AT&T cable several years ago, which in turn bought out TCI, which bought out the our presumably original local independent system Columbia Cable in the mid 90s. The cable system has slowly been falling in a state of decay since Com bought it out. They have slowly been moving to a hybrid fiber-coax system but a lot of Clark County especially in west Vancouver and around the mall (the headend only 1/4 mile or so away from the mall) is still mostly direct coax. Comcast seems to do very little preventitive maintenence on the system. Driving around the Vancouver metro I've seen unterminated cables hanging down from abandoned service drops, birds (mice?) nesting in splice boxes, expansion loops falling off their tennis raquets, shoddy customer-installed extensions with low-quality cable, open amplifier/fiber cabinets, coax lines tangled around phone lines, etc. I even know a guy who, when he was younger, managed to get free cable TV just by driving a piece of metal rebar into his backyard (where the cable runs from the junction into his neighbor's yard) and connecting it to his cable ready TV set, picking up its signals inductively through the ground. All the noisy cheap Chinese switching PSUs, unfiltered LEDs, compact fluorescents, TRIACs etc. isn't enough. An aging, deteriorating cable system is increasing the RF noise floor all around town.

did they not get enough government funding and have to close?



The guy running it died of lung cancer (was a heavy smoker for many years) and his kids didn't want it.

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I mentioned Red Lion years ago having Hospitality Network cable systems. I just came across this:

http://www.coxhn.com/

which I wonder is the same company? I remember the cable boxes the old system used had decals on top of a stylized "HN" logo, like this one uses (and big fat 259-type cable connectors in the room). If it is it looks like they've come quite a long way. They seem to be focused mostly on casino hotels now.

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When I was living with my ex GF, I swear someone was fuxing with RF. Randomly Bluetooth would stop working... WiFi would would be crappy, cell reception would be crappy, and remotes would not would work to TV's. Remote batteries would die in like one week - and I had to get really close to the T.V.  But then everything would just work normal again......

But I was living with a cute girl. So I'd just go get laid till things worked again. LMAO

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