D-JACK¶

A jammer wins by shouting, and everyone in range loses their link along with the drone. A quieter way is to learn the link’s own language and say one thing in it, so that the drone stops listening to its pilot. Contra-drone put that in a three-kilo box, hung it in a tree, and offered it for sale before any ministry had adopted it or any European rule said who may switch it on.

A $2,300 box whose maker claims it ends an FPV drone’s flight by joining the conversation between the drone and its pilot. UNITED24 Media reported it on 11 August 2026, while it was under combat testing and before any adoption by Ukraine’s Defence Ministry.

Three kilos up a tree¶

Contra-drone’s D-JACK does not flood the spectrum. A company representative described it: “The device hears signals from the remote control, breaks the protocol, is inserted into it and turns [off the drone].” The company claims it detects the operator’s control transmission and forces its way into the protocol, and that the drone then receives no commands.

Its no-fly radius is up to one kilometre and its working range up to three, depending on terrain. The ground version weighs about three kilograms, draws up to ten watts from a 12 to 24 volt battery, and runs for up to half a day on a pole, a tree or a building. A 200-gram version rides on a fixed-wing drone to protect it from interceptors.

The company states it is built for analogue FPV drones only and not for digitally controlled ones such as a Mavic or a Zala.

It speaks drone¶

The attack is on the protocol. The company’s description has no step that asks whose drone is flying: it hears a controller and ends the link. The device is attack D3 at the price of a second-hand car, and what the Jammer Hackathon asked for in 2024: not louder noise, but a message the drone accepts. Digital drones are the limit, and the Jammer Hackathon set its teams on those, the Mavic 3 and the Autel 4T.

Last reviewed: 2026-09-25.