Drone Defender Project suggestion

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#12

Joined Nov 30, 2010
18,076
I just ran across this advertisement. Looks like a good project for those with the skill to make it. Despite the label, it is not a gun. It appears to be an RF transmitter with very limited range.

http://thefreethoughtproject.com/company-unveils-first-ever-handheld-drone-neutralizer-gun/

No comment about why one would want or need to immobilize an unmanned drone or quad-copter which is less than 1200 feet away.;)

ps, uncertain which Forum to use. I do not intend to make one because I am not skilled in RF. Perhaps, "Chat"? Moderate as you see fit.
 

bertus

Joined Apr 5, 2008
20,049
Hello,

It looks like they "overrule" the RF signal of the owner with the "gun" to bring the drone down.
A directed beam will have more effective power than the owners transmitter.
They must know the protocol that is used to control the drone.

Bertus
 

alfacliff

Joined Dec 13, 2013
2,449
most drones use a frequency of around 2.4 ghz for control. older microwave ovens operate with hundreds of watts at about 2.4 ghz. not very safe, but could be used. caution, very unsafe if you dont know what your doing.
 

nsaspook

Joined Aug 27, 2009
6,278
unless the ultrasonic energy is strong enough to disrupt mater, what would that do?
Did you read the paper? Some of the MEMS sensors have mechanical resonances that can excited remotely with high level audio energy causing loss of control.
 

Lestraveled

Joined May 19, 2014
1,943
Barrage noise jamming would be a good technique to blind a drone. Take a 2.4 Ghz VCO and drive it with a noise source. It forces the AGC of the drone receiver to reduce sensitivity to the point where it can not receive the control signal. Add a high gain antenna and you have built your own "drone defeater". Sounds like fun.
 
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Lestraveled

Joined May 19, 2014
1,943
I believe the FCC regulation is 100 mW (+20 dbm) at the input to the antenna. If the antenna has 12 db of gain then the effective radiated power is over a watt. I might have to pull out my radar book and calculate the intercept ranges.

My shotgun of choice is a Remington 1187, modified choke.
 

nsaspook

Joined Aug 27, 2009
6,278
I like the feel of a good combat pump shotgun rocking somethings world. My Drone weapon of choice would be my Winchester 1300 if they all gained super-intelligence and decided we should all be Grey goo. :eek:
 

JoeJester

Joined Apr 26, 2005
4,077
FCC rules on power are explained here.

The weapon will have to be within those specifications for the application. Happy hunting.
 

Lestraveled

Joined May 19, 2014
1,943
Actually FCC part 15 applies to one of us building a drone blaster (unlicensed, not for sale). In the 2.4 Ghz frequency band the maximum power is 1 watt. But it does specify that you must cease transmission if you interfere with a licensed transmission. I assume that the drone transmitters are licensed. So, I don't see how anyone can legally sell a drone "jammer", like the one #12 linked to in post #1.
 

JoeJester

Joined Apr 26, 2005
4,077
I don't think drones require a license, so your fighting the same power ..... with only the distance between you and the controller as the factor.

on edit ....

depending on the video system aboard your quad copter, you could be required to hold an Amateur Radio License ....

Therefore, when you use disabling emissions to bring that drone down, you are NOT interfering with the video the controller see's on their licensed equipment. :)
 
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Lestraveled

Joined May 19, 2014
1,943
I don't think drones require a license, so your fighting the same power ..... with only the distance between you and the controller as the factor.
There are a few factors that work in the jammers favor. One, the drone transmitter antenna is omni-directional, which has at best 3 db of gain, while the jammer antenna is very narrow beam width easily yielding well over 12 db of gain. Two, typically the distance from controller to drone is very large while the distance from jammer to drone is very small. Many factors are in the jammers favor. If the drone controller is unlicensed then it shares the 1 watt power limitation of the jammer. It could be done.
 

BR-549

Joined Sep 22, 2013
4,936
No matter what license you have(or don’t have), or what unlicensed band you are experimenting on, you may not intentionally or un-intentionally interfere with a radio signal. Even an un-licensed or exempt R/C signal.

This is what started the FCC.

And I’m sure the FAA takes jurisdiction at some level over your house.

If I had a FCC or a FAA license, I would lay off the drones ‘til these privacy issues are resolved.
 

Lestraveled

Joined May 19, 2014
1,943
I think #4 turkey shot would do a better job than buckshot. More pellets. That's just me though.

KG7VH
 

Lestraveled

Joined May 19, 2014
1,943
.......... you may not intentionally or un-intentionally interfere with a radio signal. Even an un-licensed or exempt R/C signal..................
Then I say again, how can someone sell a drone jammer, like the one linked to in #12's first post.
 
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