5 ms·

Assuming you know the frequency a drone is flying on, it is trivial to jam. Hence they make it hard to know the frequency: http://en.wikipedia.org/wiki/Frequen

by GHFigs 12y ago

Assuming you know the frequency a drone is flying on, it is trivial to jam. Hence they make it hard to know the frequency: http://en.wikipedia.org/wiki/Frequency_hopping http://en.wikipedia.org/wiki/Frequency_hopping

baddox 12y ago
Yep, the vast majority of 2.4 GHz hobbyist RC aircraft do this, but you're still subject to noise floor issues. It might take a heck of a lot of power, but there's no technical reason why this stuff still can't be jammed, and it's not that rare to have signal drop-outs caused by (presumably) unintentional interference.
- XorNot 12y ago
  Powering up a multi-megawatt 2.4 GHz jammer will get you arrested. You are not allowed to transmit in the 2.4GHz band over a few watts (and even then) without a license and the rules are very specific for what you can send (in Australia for example you're not allowed to encrypt that traffic). And frankly, all the panicky idiots who keep salivating at the prospect of wrecking things makes me glad the rules for radio transmissions are the way they are. Heads off a heck of a lot of problems.
  - baddox 12y ago
    My favorite comment was the user who was so worried about the danger of drones falling on people in Yosemite that he/she would throw a rock to knock the drone out of the sky. Solid logic.
  - jacquesm 12y ago
    You don't need multiple megawatts. You just need to be louder than the original transmitter. And that's not all that hard, especially if you can use a directional antenna pointing in the direction of the drone.
    - baddox 12y ago
      For frequency hopping radio links, you would need to be louder than the original transmitter on every part of the spectrum the radio is jumping to.
      - jacquesm 12y ago
        Being 'dirty' is a lot easier than being clean. The bands are typically not all that wide and to mess them up is easier than to be nice. A sawtooth modulator with a suitably high frequency modulating a carrier will disrupt a significant chunk of the spectrum with reasonably little power input. After all you only need to disrupt part of each packet to disrupt the packet. Jamming is a lot easier than getting a nicely modulated signal through.

by GHFigs 12y ago

baddox 12y ago

Yep, the vast majority of 2.4 GHz hobbyist RC aircraft do this, but you're still subject to noise floor issues. It might take a heck of a lot of power, but there's no technical reason why this stuff still can't be jammed, and it's not that rare to have signal drop-outs caused by (presumably) unintentional interference.

XorNot 12y ago
Powering up a multi-megawatt 2.4 GHz jammer will get you arrested. You are not allowed to transmit in the 2.4GHz band over a few watts (and even then) without a license and the rules are very specific for what you can send (in Australia for example you're not allowed to encrypt that traffic). And frankly, all the panicky idiots who keep salivating at the prospect of wrecking things makes me glad the rules for radio transmissions are the way they are. Heads off a heck of a lot of problems.
- baddox 12y ago
  My favorite comment was the user who was so worried about the danger of drones falling on people in Yosemite that he/she would throw a rock to knock the drone out of the sky. Solid logic.
- jacquesm 12y ago
  You don't need multiple megawatts. You just need to be louder than the original transmitter. And that's not all that hard, especially if you can use a directional antenna pointing in the direction of the drone.
  - baddox 12y ago
    For frequency hopping radio links, you would need to be louder than the original transmitter on every part of the spectrum the radio is jumping to.
    - jacquesm 12y ago
      Being 'dirty' is a lot easier than being clean. The bands are typically not all that wide and to mess them up is easier than to be nice. A sawtooth modulator with a suitably high frequency modulating a carrier will disrupt a significant chunk of the spectrum with reasonably little power input. After all you only need to disrupt part of each packet to disrupt the packet. Jamming is a lot easier than getting a nicely modulated signal through.